Oops, fix delimiter documentation
[tig] / tig.c
diff --git a/tig.c b/tig.c
index 69d5059..6682555 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2006 Jonas Fonseca <fonseca@diku.dk>
+/* Copyright (c) 2006-2008 Jonas Fonseca <fonseca@diku.dk>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * GNU General Public License for more details.
  */
 
-#ifndef        VERSION
-#define VERSION        "tig-0.5.git"
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef TIG_VERSION
+#define TIG_VERSION "unknown-version"
 #endif
 
 #ifndef DEBUG
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <unistd.h>
 #include <time.h>
 
-#include <sys/types.h>
 #include <regex.h>
 
 #include <locale.h>
 #include <langinfo.h>
 #include <iconv.h>
 
+/* ncurses(3): Must be defined to have extended wide-character functions. */
+#define _XOPEN_SOURCE_EXTENDED
+
 #include <curses.h>
 
 #if __GNUC__ >= 3
 #endif
 
 static void __NORETURN die(const char *err, ...);
+static void warn(const char *msg, ...);
 static void report(const char *msg, ...);
-static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, int, char *, int));
+static int read_properties(FILE *pipe, const char *separators, int (*read)(char *, size_t, char *, size_t));
 static void set_nonblocking_input(bool loading);
-static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed);
+static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bool reserve);
 
 #define ABS(x)         ((x) >= 0  ? (x) : -(x))
 #define MIN(x, y)      ((x) < (y) ? (x) :  (y))
@@ -67,6 +76,7 @@ static size_t utf8_length(const char *string, size_t max_width, int *coloffset,
 #define REVGRAPH_MERGE 'M'
 #define REVGRAPH_BRANCH        '+'
 #define REVGRAPH_COMMIT        '*'
+#define REVGRAPH_BOUND '^'
 #define REVGRAPH_LINE  '|'
 
 #define SIZEOF_REVGRAPH        19      /* Size of revision ancestry graphics. */
@@ -75,31 +85,41 @@ static size_t utf8_length(const char *string, size_t max_width, int *coloffset,
 #define COLOR_DEFAULT  (-1)
 
 #define ICONV_NONE     ((iconv_t) -1)
+#ifndef ICONV_CONST
+#define ICONV_CONST    /* nothing */
+#endif
 
 /* The format and size of the date column in the main view. */
 #define DATE_FORMAT    "%Y-%m-%d %H:%M"
 #define DATE_COLS      STRING_SIZE("2006-04-29 14:21 ")
 
 #define AUTHOR_COLS    20
+#define ID_COLS                8
 
 /* The default interval between line numbers. */
-#define NUMBER_INTERVAL        1
+#define NUMBER_INTERVAL        5
 
 #define TABSIZE                8
 
 #define        SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
 
+#define NULL_ID                "0000000000000000000000000000000000000000"
+
+#ifndef GIT_CONFIG
+#define GIT_CONFIG "git config"
+#endif
+
 #define TIG_LS_REMOTE \
        "git ls-remote $(git rev-parse --git-dir) 2>/dev/null"
 
 #define TIG_DIFF_CMD \
-       "git show --root --patch-with-stat --find-copies-harder -B -C %s 2>/dev/null"
+       "git show --pretty=fuller --no-color --root --patch-with-stat --find-copies-harder -C %s 2>/dev/null"
 
 #define TIG_LOG_CMD    \
-       "git log --cc --stat -n100 %s 2>/dev/null"
+       "git log --no-color --cc --stat -n100 %s 2>/dev/null"
 
 #define TIG_MAIN_CMD \
-       "git log --topo-order --pretty=raw %s 2>/dev/null"
+       "git log --no-color --topo-order --parents --boundary --pretty=raw %s 2>/dev/null"
 
 #define TIG_TREE_CMD   \
        "git ls-tree %s %s"
@@ -110,6 +130,9 @@ static size_t utf8_length(const char *string, size_t max_width, int *coloffset,
 /* XXX: Needs to be defined to the empty string. */
 #define TIG_HELP_CMD   ""
 #define TIG_PAGER_CMD  ""
+#define TIG_STATUS_CMD ""
+#define TIG_STAGE_CMD  ""
+#define TIG_BLAME_CMD  ""
 
 /* Some ascii-shorthands fitted into the ncurses namespace. */
 #define KEY_TAB                '\t'
@@ -121,8 +144,10 @@ struct ref {
        char *name;             /* Ref name; tag or head names are shortened. */
        char id[SIZEOF_REV];    /* Commit SHA1 ID */
        unsigned int tag:1;     /* Is it a tag? */
+       unsigned int ltag:1;    /* If so, is the tag local? */
        unsigned int remote:1;  /* Is it a remote ref? */
        unsigned int next:1;    /* For ref lists: are there more refs? */
+       unsigned int head:1;    /* Is it the current HEAD? */
 };
 
 static struct ref **get_refs(char *id);
@@ -168,11 +193,17 @@ string_ncopy_do(char *dst, size_t dstlen, const char *src, size_t srclen)
 /* Shorthands for safely copying into a fixed buffer. */
 
 #define string_copy(dst, src) \
-       string_ncopy_do(dst, sizeof(dst), src, sizeof(dst))
+       string_ncopy_do(dst, sizeof(dst), src, sizeof(src))
 
 #define string_ncopy(dst, src, srclen) \
        string_ncopy_do(dst, sizeof(dst), src, srclen)
 
+#define string_copy_rev(dst, src) \
+       string_ncopy_do(dst, SIZEOF_REV, src, SIZEOF_REV - 1)
+
+#define string_add(dst, from, src) \
+       string_ncopy_do(dst + (from), sizeof(dst) - (from), src, sizeof(src))
+
 static char *
 chomp_string(char *name)
 {
@@ -269,6 +300,9 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        }
        BUFPUT('\'');
 
+       if (bufsize < SIZEOF_STR)
+               buf[bufsize] = 0;
+
        return bufsize;
 }
 
@@ -285,14 +319,18 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(VIEW_LOG,          "Show log view"), \
        REQ_(VIEW_TREE,         "Show tree view"), \
        REQ_(VIEW_BLOB,         "Show blob view"), \
+       REQ_(VIEW_BLAME,        "Show blame view"), \
        REQ_(VIEW_HELP,         "Show help page"), \
        REQ_(VIEW_PAGER,        "Show pager view"), \
+       REQ_(VIEW_STATUS,       "Show status view"), \
+       REQ_(VIEW_STAGE,        "Show stage view"), \
        \
        REQ_GROUP("View manipulation") \
        REQ_(ENTER,             "Enter current line and scroll"), \
        REQ_(NEXT,              "Move to next"), \
        REQ_(PREVIOUS,          "Move to previous"), \
        REQ_(VIEW_NEXT,         "Move focus to next view"), \
+       REQ_(REFRESH,           "Reload and refresh"), \
        REQ_(VIEW_CLOSE,        "Close the current view"), \
        REQ_(QUIT,              "Close all views and quit"), \
        \
@@ -317,14 +355,21 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(FIND_PREV,         "Find previous search match"), \
        \
        REQ_GROUP("Misc") \
-       REQ_(NONE,              "Do nothing"), \
        REQ_(PROMPT,            "Bring up the prompt"), \
        REQ_(SCREEN_REDRAW,     "Redraw the screen"), \
        REQ_(SCREEN_RESIZE,     "Resize the screen"), \
        REQ_(SHOW_VERSION,      "Show version information"), \
        REQ_(STOP_LOADING,      "Stop all loading views"), \
        REQ_(TOGGLE_LINENO,     "Toggle line numbers"), \
-       REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization")
+       REQ_(TOGGLE_DATE,       "Toggle date display"), \
+       REQ_(TOGGLE_AUTHOR,     "Toggle author display"), \
+       REQ_(TOGGLE_REV_GRAPH,  "Toggle revision graph visualization"), \
+       REQ_(TOGGLE_REFS,       "Toggle reference display (tags/branches)"), \
+       REQ_(STATUS_UPDATE,     "Update file status"), \
+       REQ_(STATUS_MERGE,      "Merge file using external tool"), \
+       REQ_(TREE_PARENT,       "Switch to parent directory in tree view"), \
+       REQ_(EDIT,              "Open in editor"), \
+       REQ_(NONE,              "Do nothing")
 
 
 /* User action requests. */
@@ -334,8 +379,7 @@ enum request {
 
        /* Offset all requests to avoid conflicts with ncurses getch values. */
        REQ_OFFSET = KEY_MAX + 1,
-       REQ_INFO,
-       REQ_UNKNOWN,
+       REQ_INFO
 
 #undef REQ_GROUP
 #undef REQ_
@@ -367,7 +411,7 @@ get_request(const char *name)
                    !string_enum_compare(req_info[i].name, name, namelen))
                        return req_info[i].request;
 
-       return REQ_UNKNOWN;
+       return REQ_NONE;
 }
 
 
@@ -376,168 +420,127 @@ get_request(const char *name)
  */
 
 static const char usage[] =
-VERSION " (" __DATE__ ")\n"
+"tig " TIG_VERSION " (" __DATE__ ")\n"
 "\n"
-"Usage: tig [options]\n"
-"   or: tig [options] [--] [git log options]\n"
-"   or: tig [options] log  [git log options]\n"
-"   or: tig [options] diff [git diff options]\n"
-"   or: tig [options] show [git show options]\n"
-"   or: tig [options] <    [git command output]\n"
+"Usage: tig        [options] [revs] [--] [paths]\n"
+"   or: tig show   [options] [revs] [--] [paths]\n"
+"   or: tig blame  [rev] path\n"
+"   or: tig status\n"
+"   or: tig <      [git command output]\n"
 "\n"
 "Options:\n"
-"  -l                          Start up in log view\n"
-"  -d                          Start up in diff view\n"
-"  -n[I], --line-number[=I]    Show line numbers with given interval\n"
-"  -b[N], --tab-size[=N]       Set number of spaces for tab expansion\n"
-"  --                          Mark end of tig options\n"
-"  -v, --version               Show version and exit\n"
-"  -h, --help                  Show help message and exit\n";
+"  -v, --version   Show version and exit\n"
+"  -h, --help      Show help message and exit";
 
 /* Option and state variables. */
+static bool opt_date                   = TRUE;
+static bool opt_author                 = TRUE;
 static bool opt_line_number            = FALSE;
 static bool opt_rev_graph              = FALSE;
+static bool opt_show_refs              = TRUE;
 static int opt_num_interval            = NUMBER_INTERVAL;
 static int opt_tab_size                        = TABSIZE;
 static enum request opt_request                = REQ_VIEW_MAIN;
 static char opt_cmd[SIZEOF_STR]                = "";
 static char opt_path[SIZEOF_STR]       = "";
+static char opt_file[SIZEOF_STR]       = "";
+static char opt_ref[SIZEOF_REF]                = "";
+static char opt_head[SIZEOF_REF]       = "";
+static bool opt_no_head                        = TRUE;
 static FILE *opt_pipe                  = NULL;
 static char opt_encoding[20]           = "UTF-8";
 static bool opt_utf8                   = TRUE;
 static char opt_codeset[20]            = "UTF-8";
 static iconv_t opt_iconv               = ICONV_NONE;
 static char opt_search[SIZEOF_STR]     = "";
-
-enum option_type {
-       OPT_NONE,
-       OPT_INT,
-};
+static char opt_cdup[SIZEOF_STR]       = "";
+static char opt_git_dir[SIZEOF_STR]    = "";
+static signed char opt_is_inside_work_tree     = -1; /* set to TRUE or FALSE */
+static char opt_editor[SIZEOF_STR]     = "";
 
 static bool
-check_option(char *opt, char short_name, char *name, enum option_type type, ...)
+parse_options(int argc, char *argv[])
 {
-       va_list args;
-       char *value = "";
-       int *number;
+       size_t buf_size;
+       char *subcommand;
+       bool seen_dashdash = FALSE;
+       int i;
 
-       if (opt[0] != '-')
-               return FALSE;
+       if (argc <= 1)
+               return TRUE;
 
-       if (opt[1] == '-') {
-               int namelen = strlen(name);
+       subcommand = argv[1];
+       if (!strcmp(subcommand, "status") || !strcmp(subcommand, "-S")) {
+               opt_request = REQ_VIEW_STATUS;
+               if (!strcmp(subcommand, "-S"))
+                       warn("`-S' has been deprecated; use `tig status' instead");
+               if (argc > 2)
+                       warn("ignoring arguments after `%s'", subcommand);
+               return TRUE;
 
-               opt += 2;
+       } else if (!strcmp(subcommand, "blame")) {
+               opt_request = REQ_VIEW_BLAME;
+               if (argc <= 2 || argc > 4)
+                       die("invalid number of options to blame\n\n%s", usage);
 
-               if (strncmp(opt, name, namelen))
-                       return FALSE;
+               i = 2;
+               if (argc == 4) {
+                       string_ncopy(opt_ref, argv[i], strlen(argv[i]));
+                       i++;
+               }
 
-               if (opt[namelen] == '=')
-                       value = opt + namelen + 1;
+               string_ncopy(opt_file, argv[i], strlen(argv[i]));
+               return TRUE;
 
-       } else {
-               if (!short_name || opt[1] != short_name)
-                       return FALSE;
-               value = opt + 2;
-       }
+       } else if (!strcmp(subcommand, "show")) {
+               opt_request = REQ_VIEW_DIFF;
 
-       va_start(args, type);
-       if (type == OPT_INT) {
-               number = va_arg(args, int *);
-               if (isdigit(*value))
-                       *number = atoi(value);
+       } else if (!strcmp(subcommand, "log") || !strcmp(subcommand, "diff")) {
+               opt_request = subcommand[0] == 'l'
+                           ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
+               warn("`tig %s' has been deprecated", subcommand);
+
+       } else {
+               subcommand = NULL;
        }
-       va_end(args);
 
-       return TRUE;
-}
+       if (!subcommand)
+               /* XXX: This is vulnerable to the user overriding
+                * options required for the main view parser. */
+               string_copy(opt_cmd, "git log --no-color --pretty=raw --boundary --parents");
+       else
+               string_format(opt_cmd, "git %s", subcommand);
 
-/* Returns the index of log or diff command or -1 to exit. */
-static bool
-parse_options(int argc, char *argv[])
-{
-       int i;
+       buf_size = strlen(opt_cmd);
 
-       for (i = 1; i < argc; i++) {
+       for (i = 1 + !!subcommand; i < argc; i++) {
                char *opt = argv[i];
 
-               if (!strcmp(opt, "log") ||
-                   !strcmp(opt, "diff") ||
-                   !strcmp(opt, "show")) {
-                       opt_request = opt[0] == 'l'
-                                   ? REQ_VIEW_LOG : REQ_VIEW_DIFF;
-                       break;
-               }
-
-               if (opt[0] && opt[0] != '-')
-                       break;
-
-               if (!strcmp(opt, "-l")) {
-                       opt_request = REQ_VIEW_LOG;
-                       continue;
-               }
-
-               if (!strcmp(opt, "-d")) {
-                       opt_request = REQ_VIEW_DIFF;
-                       continue;
-               }
-
-               if (check_option(opt, 'n', "line-number", OPT_INT, &opt_num_interval)) {
-                       opt_line_number = TRUE;
-                       continue;
-               }
-
-               if (check_option(opt, 'b', "tab-size", OPT_INT, &opt_tab_size)) {
-                       opt_tab_size = MIN(opt_tab_size, TABSIZE);
-                       continue;
-               }
+               if (seen_dashdash || !strcmp(opt, "--")) {
+                       seen_dashdash = TRUE;
 
-               if (check_option(opt, 'v', "version", OPT_NONE)) {
-                       printf("tig version %s\n", VERSION);
+               } else if (!strcmp(opt, "-v") || !strcmp(opt, "--version")) {
+                       printf("tig version %s\n", TIG_VERSION);
                        return FALSE;
-               }
 
-               if (check_option(opt, 'h', "help", OPT_NONE)) {
+               } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
                        printf(usage);
                        return FALSE;
                }
 
-               if (!strcmp(opt, "--")) {
-                       i++;
-                       break;
-               }
-
-               die("unknown option '%s'\n\n%s", opt, usage);
+               opt_cmd[buf_size++] = ' ';
+               buf_size = sq_quote(opt_cmd, buf_size, opt);
+               if (buf_size >= sizeof(opt_cmd))
+                       die("command too long");
        }
 
        if (!isatty(STDIN_FILENO)) {
                opt_request = REQ_VIEW_PAGER;
                opt_pipe = stdin;
-
-       } else if (i < argc) {
-               size_t buf_size;
-
-               if (opt_request == REQ_VIEW_MAIN)
-                       /* XXX: This is vulnerable to the user overriding
-                        * options required for the main view parser. */
-                       string_copy(opt_cmd, "git log --pretty=raw");
-               else
-                       string_copy(opt_cmd, "git");
-               buf_size = strlen(opt_cmd);
-
-               while (buf_size < sizeof(opt_cmd) && i < argc) {
-                       opt_cmd[buf_size++] = ' ';
-                       buf_size = sq_quote(opt_cmd, buf_size, argv[i++]);
-               }
-
-               if (buf_size >= sizeof(opt_cmd))
-                       die("command too long");
-
-               opt_cmd[buf_size] = 0;
+               buf_size = 0;
        }
 
-       if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
-               opt_utf8 = FALSE;
+       opt_cmd[buf_size] = 0;
 
        return TRUE;
 }
@@ -579,17 +582,31 @@ LINE(ACKED,          "    Acked-by",      COLOR_YELLOW,   COLOR_DEFAULT,  0), \
 LINE(DEFAULT,     "",                  COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
 LINE(CURSOR,      "",                  COLOR_WHITE,    COLOR_GREEN,    A_BOLD), \
 LINE(STATUS,      "",                  COLOR_GREEN,    COLOR_DEFAULT,  0), \
+LINE(DELIMITER,           "",                  COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(TITLE_BLUR,   "",                 COLOR_WHITE,    COLOR_BLUE,     0), \
 LINE(TITLE_FOCUS,  "",                 COLOR_WHITE,    COLOR_BLUE,     A_BOLD), \
 LINE(MAIN_DATE,    "",                 COLOR_BLUE,     COLOR_DEFAULT,  0), \
 LINE(MAIN_AUTHOR,  "",                 COLOR_GREEN,    COLOR_DEFAULT,  0), \
 LINE(MAIN_COMMIT,  "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
-LINE(MAIN_DELIM,   "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(MAIN_TAG,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
+LINE(MAIN_LOCAL_TAG,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  A_BOLD), \
 LINE(MAIN_REMOTE,  "",                 COLOR_YELLOW,   COLOR_DEFAULT,  A_BOLD), \
 LINE(MAIN_REF,     "",                 COLOR_CYAN,     COLOR_DEFAULT,  A_BOLD), \
+LINE(MAIN_HEAD,    "",                 COLOR_RED,      COLOR_DEFAULT,  A_BOLD), \
+LINE(MAIN_REVGRAPH,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
 LINE(TREE_DIR,     "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
-LINE(TREE_FILE,    "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL)
+LINE(TREE_FILE,    "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  A_NORMAL), \
+LINE(STAT_HEAD,    "",                 COLOR_YELLOW,   COLOR_DEFAULT,  0), \
+LINE(STAT_SECTION, "",                 COLOR_CYAN,     COLOR_DEFAULT,  0), \
+LINE(STAT_NONE,    "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
+LINE(STAT_STAGED,  "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(STAT_UNSTAGED,"",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(STAT_UNTRACKED,"",                        COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(BLAME_DATE,    "",                        COLOR_BLUE,     COLOR_DEFAULT,  0), \
+LINE(BLAME_AUTHOR,  "",                        COLOR_GREEN,    COLOR_DEFAULT,  0), \
+LINE(BLAME_COMMIT, "",                 COLOR_DEFAULT,  COLOR_DEFAULT,  0), \
+LINE(BLAME_ID,     "",                 COLOR_MAGENTA,  COLOR_DEFAULT,  0), \
+LINE(BLAME_LINENO, "",                 COLOR_CYAN,     COLOR_DEFAULT,  0)
 
 enum line_type {
 #define LINE(type, line, fg, bg, attr) \
@@ -636,8 +653,9 @@ get_line_attr(enum line_type type)
 }
 
 static struct line_info *
-get_line_info(char *name, int namelen)
+get_line_info(char *name)
 {
+       size_t namelen = strlen(name);
        enum line_type type;
 
        for (type = 0; type < ARRAY_SIZE(line_info); type++)
@@ -651,15 +669,15 @@ get_line_info(char *name, int namelen)
 static void
 init_colors(void)
 {
-       int default_bg = COLOR_BLACK;
-       int default_fg = COLOR_WHITE;
+       int default_bg = line_info[LINE_DEFAULT].bg;
+       int default_fg = line_info[LINE_DEFAULT].fg;
        enum line_type type;
 
        start_color();
 
-       if (use_default_colors() != ERR) {
-               default_bg = -1;
-               default_fg = -1;
+       if (assume_default_colors(default_fg, default_bg) == ERR) {
+               default_bg = COLOR_BLACK;
+               default_fg = COLOR_WHITE;
        }
 
        for (type = 0; type < ARRAY_SIZE(line_info); type++) {
@@ -676,6 +694,7 @@ struct line {
 
        /* State flags */
        unsigned int selected:1;
+       unsigned int dirty:1;
 
        void *data;             /* User data */
 };
@@ -698,8 +717,11 @@ static struct keybinding default_keybindings[] = {
        { 'l',          REQ_VIEW_LOG },
        { 't',          REQ_VIEW_TREE },
        { 'f',          REQ_VIEW_BLOB },
+       { 'B',          REQ_VIEW_BLAME },
        { 'p',          REQ_VIEW_PAGER },
        { 'h',          REQ_VIEW_HELP },
+       { 'S',          REQ_VIEW_STATUS },
+       { 'c',          REQ_VIEW_STAGE },
 
        /* View manipulation */
        { 'q',          REQ_VIEW_CLOSE },
@@ -707,6 +729,7 @@ static struct keybinding default_keybindings[] = {
        { KEY_RETURN,   REQ_ENTER },
        { KEY_UP,       REQ_PREVIOUS },
        { KEY_DOWN,     REQ_NEXT },
+       { 'R',          REQ_REFRESH },
 
        /* Cursor navigation */
        { 'k',          REQ_MOVE_UP },
@@ -737,8 +760,15 @@ static struct keybinding default_keybindings[] = {
        { 'v',          REQ_SHOW_VERSION },
        { 'r',          REQ_SCREEN_REDRAW },
        { '.',          REQ_TOGGLE_LINENO },
+       { 'D',          REQ_TOGGLE_DATE },
+       { 'A',          REQ_TOGGLE_AUTHOR },
        { 'g',          REQ_TOGGLE_REV_GRAPH },
+       { 'F',          REQ_TOGGLE_REFS },
        { ':',          REQ_PROMPT },
+       { 'u',          REQ_STATUS_UPDATE },
+       { 'M',          REQ_STATUS_MERGE },
+       { ',',          REQ_TREE_PARENT },
+       { 'e',          REQ_EDIT },
 
        /* Using the ncurses SIGWINCH handler. */
        { KEY_RESIZE,   REQ_SCREEN_RESIZE },
@@ -751,8 +781,11 @@ static struct keybinding default_keybindings[] = {
        KEYMAP_(LOG), \
        KEYMAP_(TREE), \
        KEYMAP_(BLOB), \
+       KEYMAP_(BLAME), \
        KEYMAP_(PAGER), \
-       KEYMAP_(HELP) \
+       KEYMAP_(HELP), \
+       KEYMAP_(STATUS), \
+       KEYMAP_(STAGE)
 
 enum keymap {
 #define KEYMAP_(name) KEYMAP_##name
@@ -862,39 +895,44 @@ get_key_value(const char *name)
 }
 
 static char *
+get_key_name(int key_value)
+{
+       static char key_char[] = "'X'";
+       char *seq = NULL;
+       int key;
+
+       for (key = 0; key < ARRAY_SIZE(key_table); key++)
+               if (key_table[key].value == key_value)
+                       seq = key_table[key].name;
+
+       if (seq == NULL &&
+           key_value < 127 &&
+           isprint(key_value)) {
+               key_char[1] = (char) key_value;
+               seq = key_char;
+       }
+
+       return seq ? seq : "'?'";
+}
+
+static char *
 get_key(enum request request)
 {
        static char buf[BUFSIZ];
-       static char key_char[] = "'X'";
        size_t pos = 0;
-       char *sep = "    ";
+       char *sep = "";
        int i;
 
        buf[pos] = 0;
 
        for (i = 0; i < ARRAY_SIZE(default_keybindings); i++) {
                struct keybinding *keybinding = &default_keybindings[i];
-               char *seq = NULL;
-               int key;
 
                if (keybinding->request != request)
                        continue;
 
-               for (key = 0; key < ARRAY_SIZE(key_table); key++)
-                       if (key_table[key].value == keybinding->alias)
-                               seq = key_table[key].name;
-
-               if (seq == NULL &&
-                   keybinding->alias < 127 &&
-                   isprint(keybinding->alias)) {
-                       key_char[1] = (char) keybinding->alias;
-                       seq = key_char;
-               }
-
-               if (!seq)
-                       seq = "'?'";
-
-               if (!string_format_from(buf, &pos, "%s%s", sep, seq))
+               if (!string_format_from(buf, &pos, "%s%s", sep,
+                                       get_key_name(keybinding->alias)))
                        return "Too many keybindings!";
                sep = ", ";
        }
@@ -902,6 +940,67 @@ get_key(enum request request)
        return buf;
 }
 
+struct run_request {
+       enum keymap keymap;
+       int key;
+       char cmd[SIZEOF_STR];
+};
+
+static struct run_request *run_request;
+static size_t run_requests;
+
+static enum request
+add_run_request(enum keymap keymap, int key, int argc, char **argv)
+{
+       struct run_request *tmp;
+       struct run_request req = { keymap, key };
+       size_t bufpos;
+
+       for (bufpos = 0; argc > 0; argc--, argv++)
+               if (!string_format_from(req.cmd, &bufpos, "%s ", *argv))
+                       return REQ_NONE;
+
+       req.cmd[bufpos - 1] = 0;
+
+       tmp = realloc(run_request, (run_requests + 1) * sizeof(*run_request));
+       if (!tmp)
+               return REQ_NONE;
+
+       run_request = tmp;
+       run_request[run_requests++] = req;
+
+       return REQ_NONE + run_requests;
+}
+
+static struct run_request *
+get_run_request(enum request request)
+{
+       if (request <= REQ_NONE)
+               return NULL;
+       return &run_request[request - REQ_NONE - 1];
+}
+
+static void
+add_builtin_run_requests(void)
+{
+       struct {
+               enum keymap keymap;
+               int key;
+               char *argv[1];
+       } reqs[] = {
+               { KEYMAP_MAIN,    'C', { "git cherry-pick %(commit)" } },
+               { KEYMAP_GENERIC, 'G', { "git gc" } },
+       };
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(reqs); i++) {
+               enum request req;
+
+               req = add_run_request(reqs[i].keymap, reqs[i].key, 1, reqs[i].argv);
+               if (req != REQ_NONE)
+                       add_keybinding(reqs[i].keymap, req, reqs[i].key);
+       }
+}
 
 /*
  * User config file handling.
@@ -952,10 +1051,15 @@ option_color_command(int argc, char *argv[])
                return ERR;
        }
 
-       info = get_line_info(argv[0], strlen(argv[0]));
+       info = get_line_info(argv[0]);
        if (!info) {
-               config_msg = "Unknown color name";
-               return ERR;
+               if (!string_enum_compare(argv[0], "main-delim", strlen("main-delim"))) {
+                       info = get_line_info("delimiter");
+
+               } else {
+                       config_msg = "Unknown color name";
+                       return ERR;
+               }
        }
 
        if (set_color(&info->fg, argv[1]) == ERR ||
@@ -972,6 +1076,12 @@ option_color_command(int argc, char *argv[])
        return OK;
 }
 
+static bool parse_bool(const char *s)
+{
+       return (!strcmp(s, "1") || !strcmp(s, "true") ||
+               !strcmp(s, "yes")) ? TRUE : FALSE;
+}
+
 /* Wants: name = value */
 static int
 option_set_command(int argc, char *argv[])
@@ -986,10 +1096,28 @@ option_set_command(int argc, char *argv[])
                return ERR;
        }
 
+       if (!strcmp(argv[0], "show-author")) {
+               opt_author = parse_bool(argv[2]);
+               return OK;
+       }
+
+       if (!strcmp(argv[0], "show-date")) {
+               opt_date = parse_bool(argv[2]);
+               return OK;
+       }
+
        if (!strcmp(argv[0], "show-rev-graph")) {
-               opt_rev_graph = (!strcmp(argv[2], "1") ||
-                                !strcmp(argv[2], "true") ||
-                                !strcmp(argv[2], "yes"));
+               opt_rev_graph = parse_bool(argv[2]);
+               return OK;
+       }
+
+       if (!strcmp(argv[0], "show-refs")) {
+               opt_show_refs = parse_bool(argv[2]);
+               return OK;
+       }
+
+       if (!strcmp(argv[0], "show-line-numbers")) {
+               opt_line_number = parse_bool(argv[2]);
                return OK;
        }
 
@@ -1017,7 +1145,7 @@ option_set_command(int argc, char *argv[])
                                        break;
                                }
                default:
-                       string_copy(opt_encoding, arg);
+                       string_ncopy(opt_encoding, arg, strlen(arg));
                        return OK;
                }
        }
@@ -1034,7 +1162,7 @@ option_bind_command(int argc, char *argv[])
        int keymap;
        int key;
 
-       if (argc != 3) {
+       if (argc < 3) {
                config_msg = "Wrong number of arguments given to bind command";
                return ERR;
        }
@@ -1051,7 +1179,22 @@ option_bind_command(int argc, char *argv[])
        }
 
        request = get_request(argv[2]);
-       if (request == REQ_UNKNOWN) {
+       if (request == REQ_NONE) {
+               const char *obsolete[] = { "cherry-pick" };
+               size_t namelen = strlen(argv[2]);
+               int i;
+
+               for (i = 0; i < ARRAY_SIZE(obsolete); i++) {
+                       if (namelen == strlen(obsolete[i]) &&
+                           !string_enum_compare(obsolete[i], argv[2], namelen)) {
+                               config_msg = "Obsolete request name";
+                               return ERR;
+                       }
+               }
+       }
+       if (request == REQ_NONE && *argv[2]++ == '!')
+               request = add_run_request(keymap, key, argc - 2, argv + 2);
+       if (request == REQ_NONE) {
                config_msg = "Unknown request name";
                return ERR;
        }
@@ -1071,9 +1214,10 @@ set_option(char *opt, char *value)
        /* Tokenize */
        while (argc < ARRAY_SIZE(argv) && (valuelen = strcspn(value, " \t"))) {
                argv[argc++] = value;
-
                value += valuelen;
-               if (!*value)
+
+               /* Nothing more to tokenize or last available token. */
+               if (!*value || argc >= ARRAY_SIZE(argv))
                        break;
 
                *value++ = 0;
@@ -1095,7 +1239,7 @@ set_option(char *opt, char *value)
 }
 
 static int
-read_option(char *opt, int optlen, char *value, int valuelen)
+read_option(char *opt, size_t optlen, char *value, size_t valuelen)
 {
        int status = OK;
 
@@ -1114,7 +1258,7 @@ read_option(char *opt, int optlen, char *value, int valuelen)
 
        }  else {
                /* Look for comment endings in the value. */
-               int len = strcspn(value, "#");
+               size_t len = strcspn(value, "#");
 
                if (len < valuelen) {
                        valuelen = len;
@@ -1126,7 +1270,7 @@ read_option(char *opt, int optlen, char *value, int valuelen)
 
        if (status == ERR) {
                fprintf(stderr, "Error on line %d, near '%.*s': %s\n",
-                       config_lineno, optlen, opt, config_msg);
+                       config_lineno, (int) optlen, opt, config_msg);
                config_errors = TRUE;
        }
 
@@ -1134,27 +1278,47 @@ read_option(char *opt, int optlen, char *value, int valuelen)
        return OK;
 }
 
-static int
-load_options(void)
+static void
+load_option_file(const char *path)
 {
-       char *home = getenv("HOME");
-       char buf[SIZEOF_STR];
        FILE *file;
 
-       config_lineno = 0;
-       config_errors = FALSE;
-
-       if (!home || !string_format(buf, "%s/.tigrc", home))
-               return ERR;
-
        /* It's ok that the file doesn't exist. */
-       file = fopen(buf, "r");
+       file = fopen(path, "r");
        if (!file)
-               return OK;
+               return;
+
+       config_lineno = 0;
+       config_errors = FALSE;
 
        if (read_properties(file, " \t", read_option) == ERR ||
            config_errors == TRUE)
-               fprintf(stderr, "Errors while loading %s.\n", buf);
+               fprintf(stderr, "Errors while loading %s.\n", path);
+}
+
+static int
+load_options(void)
+{
+       char *home = getenv("HOME");
+       char *tigrc_user = getenv("TIGRC_USER");
+       char *tigrc_system = getenv("TIGRC_SYSTEM");
+       char buf[SIZEOF_STR];
+
+       add_builtin_run_requests();
+
+       if (!tigrc_system) {
+               if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
+                       return ERR;
+               tigrc_system = buf;
+       }
+       load_option_file(tigrc_system);
+
+       if (!tigrc_user) {
+               if (!home || !string_format(buf, "%s/.tigrc", home))
+                       return ERR;
+               tigrc_user = buf;
+       }
+       load_option_file(tigrc_user);
 
        return OK;
 }
@@ -1215,9 +1379,10 @@ struct view {
        struct view *parent;
 
        /* Buffering */
-       unsigned long lines;    /* Total number of lines */
+       size_t lines;           /* Total number of lines */
        struct line *line;      /* Line index */
-       unsigned long line_size;/* Total number of allocated lines */
+       size_t line_alloc;      /* Total number of allocated lines */
+       size_t line_size;       /* Total number of used lines */
        unsigned int digits;    /* Number of digits in the lines member. */
 
        /* Loading */
@@ -1228,12 +1393,14 @@ struct view {
 struct view_ops {
        /* What type of content being displayed. Used in the title bar. */
        const char *type;
-       /* Draw one line; @lineno must be < view->height. */
-       bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
+       /* Open and reads in all view content. */
+       bool (*open)(struct view *view);
        /* Read one line; updates view->line. */
        bool (*read)(struct view *view, char *data);
-       /* Depending on view, change display based on current line. */
-       bool (*enter)(struct view *view, struct line *line);
+       /* Draw one line; @lineno must be < view->height. */
+       bool (*draw)(struct view *view, struct line *line, unsigned int lineno, bool selected);
+       /* Depending on view handle a special requests. */
+       enum request (*request)(struct view *view, enum request request, struct line *line);
        /* Search for regex in a line. */
        bool (*grep)(struct view *view, struct line *line);
        /* Select line */
@@ -1244,6 +1411,10 @@ static struct view_ops pager_ops;
 static struct view_ops main_ops;
 static struct view_ops tree_ops;
 static struct view_ops blob_ops;
+static struct view_ops blame_ops;
+static struct view_ops help_ops;
+static struct view_ops status_ops;
+static struct view_ops stage_ops;
 
 #define VIEW_STR(name, cmd, env, ref, ops, map) \
        { name, cmd, #env, ref, ops, map}
@@ -1253,13 +1424,16 @@ static struct view_ops blob_ops;
 
 
 static struct view views[] = {
-       VIEW_(MAIN,  "main",  &main_ops,  ref_head),
-       VIEW_(DIFF,  "diff",  &pager_ops, ref_commit),
-       VIEW_(LOG,   "log",   &pager_ops, ref_head),
-       VIEW_(TREE,  "tree",  &tree_ops,  ref_commit),
-       VIEW_(BLOB,  "blob",  &blob_ops,  ref_blob),
-       VIEW_(HELP,  "help",  &pager_ops, "static"),
-       VIEW_(PAGER, "pager", &pager_ops, "static"),
+       VIEW_(MAIN,   "main",   &main_ops,   ref_head),
+       VIEW_(DIFF,   "diff",   &pager_ops,  ref_commit),
+       VIEW_(LOG,    "log",    &pager_ops,  ref_head),
+       VIEW_(TREE,   "tree",   &tree_ops,   ref_commit),
+       VIEW_(BLOB,   "blob",   &blob_ops,   ref_blob),
+       VIEW_(BLAME,  "blame",  &blame_ops,  ref_commit),
+       VIEW_(HELP,   "help",   &help_ops,   ""),
+       VIEW_(PAGER,  "pager",  &pager_ops,  "stdin"),
+       VIEW_(STATUS, "status", &status_ops, ""),
+       VIEW_(STAGE,  "stage",  &stage_ops,  ""),
 };
 
 #define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
@@ -1270,6 +1444,40 @@ static struct view views[] = {
 #define view_is_displayed(view) \
        (view == display[0] || view == display[1])
 
+static int
+draw_text(struct view *view, const char *string, int max_len,
+         bool use_tilde, bool selected)
+{
+       int len = 0;
+       int trimmed = FALSE;
+
+       if (max_len <= 0)
+               return 0;
+
+       if (opt_utf8) {
+               len = utf8_length(string, max_len, &trimmed, use_tilde);
+       } else {
+               len = strlen(string);
+               if (len > max_len) {
+                       if (use_tilde) {
+                               max_len -= 1;
+                       }
+                       len = max_len;
+                       trimmed = TRUE;
+               }
+       }
+
+       waddnstr(view->win, string, len);
+       if (trimmed && use_tilde) {
+               if (!selected)
+                       wattrset(view->win, get_line_attr(LINE_DELIMITER));
+               waddch(view->win, '~');
+               len++;
+       }
+
+       return len;
+}
+
 static bool
 draw_view_line(struct view *view, unsigned int lineno)
 {
@@ -1301,6 +1509,32 @@ draw_view_line(struct view *view, unsigned int lineno)
 }
 
 static void
+redraw_view_dirty(struct view *view)
+{
+       bool dirty = FALSE;
+       int lineno;
+
+       for (lineno = 0; lineno < view->height; lineno++) {
+               struct line *line = &view->line[view->offset + lineno];
+
+               if (!line->dirty)
+                       continue;
+               line->dirty = 0;
+               dirty = TRUE;
+               if (!draw_view_line(view, lineno))
+                       break;
+       }
+
+       if (!dirty)
+               return;
+       redrawwin(view->win);
+       if (input_mode)
+               wnoutrefresh(view->win);
+       else
+               wrefresh(view->win);
+}
+
+static void
 redraw_view_from(struct view *view, int lineno)
 {
        assert(0 <= lineno && lineno < view->height);
@@ -1334,7 +1568,7 @@ update_view_title(struct view *view)
 
        assert(view_is_displayed(view));
 
-       if (view->lines || view->pipe) {
+       if (view != VIEW(REQ_VIEW_STATUS) && (view->lines || view->pipe)) {
                unsigned int view_lines = view->offset + view->height;
                unsigned int lines = view->lines
                                   ? MIN(view_lines, view->lines) * 100 / view->lines
@@ -1362,7 +1596,7 @@ update_view_title(struct view *view)
 
                if (minsize < view->width)
                        refsize = view->width - minsize + 7;
-               string_format_from(buf, &bufpos, " %.*s", refsize, view->ref);
+               string_format_from(buf, &bufpos, " %.*s", (int) refsize, view->ref);
        }
 
        if (statelen && bufpos < view->width) {
@@ -1622,7 +1856,8 @@ move_view(struct view *view, enum request request)
        }
 
        if (!view_is_displayed(view)) {
-               view->offset += steps;
+               view->offset += scroll_steps;
+               assert(0 <= view->offset && view->offset < view->lines);
                view->ops->select(view, &view->line[view->lineno]);
                return;
        }
@@ -1771,32 +2006,44 @@ end_update(struct view *view)
 static bool
 begin_update(struct view *view)
 {
-       const char *id = view->id;
-
        if (view->pipe)
                end_update(view);
 
        if (opt_cmd[0]) {
                string_copy(view->cmd, opt_cmd);
                opt_cmd[0] = 0;
-               /* When running random commands, the view ref could have become
-                * invalid so clear it. */
-               view->ref[0] = 0;
+               /* When running random commands, initially show the
+                * command in the title. However, it maybe later be
+                * overwritten if a commit line is selected. */
+               if (view == VIEW(REQ_VIEW_PAGER))
+                       string_copy(view->ref, view->cmd);
+               else
+                       view->ref[0] = 0;
 
        } else if (view == VIEW(REQ_VIEW_TREE)) {
                const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
+               char path[SIZEOF_STR];
 
                if (strcmp(view->vid, view->id))
-                       opt_path[0] = 0;
+                       opt_path[0] = path[0] = 0;
+               else if (sq_quote(path, 0, opt_path) >= sizeof(path))
+                       return FALSE;
 
-               if (!string_format(view->cmd, format, id, opt_path))
+               if (!string_format(view->cmd, format, view->id, path))
                        return FALSE;
 
        } else {
                const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt;
+               const char *id = view->id;
 
                if (!string_format(view->cmd, format, id, id, id, id, id))
                        return FALSE;
+
+               /* Put the current ref_* value to the view title ref
+                * member. This is needed by the blob view. Most other
+                * views sets it automatically after loading because the
+                * first line is a commit line. */
+               string_copy_rev(view->ref, view->id);
        }
 
        /* Special case for the pager view. */
@@ -1815,7 +2062,7 @@ begin_update(struct view *view)
        view->offset = 0;
        view->lines  = 0;
        view->lineno = 0;
-       string_copy(view->vid, id);
+       string_copy_rev(view->vid, view->id);
 
        if (view->line) {
                int i;
@@ -1833,15 +2080,33 @@ begin_update(struct view *view)
        return TRUE;
 }
 
+#define ITEM_CHUNK_SIZE 256
+static void *
+realloc_items(void *mem, size_t *size, size_t new_size, size_t item_size)
+{
+       size_t num_chunks = *size / ITEM_CHUNK_SIZE;
+       size_t num_chunks_new = (new_size + ITEM_CHUNK_SIZE - 1) / ITEM_CHUNK_SIZE;
+
+       if (mem == NULL || num_chunks != num_chunks_new) {
+               *size = num_chunks_new * ITEM_CHUNK_SIZE;
+               mem = realloc(mem, *size * item_size);
+       }
+
+       return mem;
+}
+
 static struct line *
 realloc_lines(struct view *view, size_t line_size)
 {
-       struct line *tmp = realloc(view->line, sizeof(*view->line) * line_size);
+       size_t alloc = view->line_alloc;
+       struct line *tmp = realloc_items(view->line, &alloc, line_size,
+                                        sizeof(*view->line));
 
        if (!tmp)
                return NULL;
 
        view->line = tmp;
+       view->line_alloc = alloc;
        view->line_size = line_size;
        return view->line;
 }
@@ -1876,7 +2141,7 @@ update_view(struct view *view)
                        line[linelen - 1] = 0;
 
                if (opt_iconv != ICONV_NONE) {
-                       char *inbuf = line;
+                       ICONV_CONST char *inbuf = line;
                        size_t inlen = linelen;
 
                        char *outbuf = out_buffer;
@@ -1927,10 +2192,19 @@ update_view(struct view *view)
                if (redraw_from > 0)
                        redraw_from--;
 
+               /* Since revision graph visualization requires knowledge
+                * about the parent commit, it causes a further one-off
+                * needed to be redrawn for incremental updates. */
+               if (redraw_from > 0 && opt_rev_graph)
+                       redraw_from--;
+
                /* Incrementally draw avoids flickering. */
                redraw_view_from(view, redraw_from);
        }
 
+       if (view == VIEW(REQ_VIEW_BLAME))
+               redraw_view_dirty(view);
+
        /* Update the title _after_ the redraw so that if the redraw picks up a
         * commit reference in view->ref it'll be available here. */
        update_view_title(view);
@@ -1951,53 +2225,36 @@ alloc_error:
        report("Allocation failure");
 
 end:
-       view->ops->read(view, NULL);
-       end_update(view);
+       if (view->ops->read(view, NULL))
+               end_update(view);
        return FALSE;
 }
 
-
-/*
- * View opening
- */
-
-static void open_help_view(struct view *view)
+static struct line *
+add_line_data(struct view *view, void *data, enum line_type type)
 {
-       char buf[BUFSIZ];
-       int lines = ARRAY_SIZE(req_info) + 2;
-       int i;
-
-       if (view->lines > 0)
-               return;
+       struct line *line = &view->line[view->lines++];
 
-       for (i = 0; i < ARRAY_SIZE(req_info); i++)
-               if (!req_info[i].request)
-                       lines++;
-
-       view->line = calloc(lines, sizeof(*view->line));
-       if (!view->line) {
-               report("Allocation failure");
-               return;
-       }
+       memset(line, 0, sizeof(*line));
+       line->type = type;
+       line->data = data;
 
-       view->ops->read(view, "Quick reference for tig keybindings:");
+       return line;
+}
 
-       for (i = 0; i < ARRAY_SIZE(req_info); i++) {
-               char *key;
+static struct line *
+add_line_text(struct view *view, char *data, enum line_type type)
+{
+       if (data)
+               data = strdup(data);
 
-               if (!req_info[i].request) {
-                       view->ops->read(view, "");
-                       view->ops->read(view, req_info[i].help);
-                       continue;
-               }
+       return data ? add_line_data(view, data, type) : NULL;
+}
 
-               key = get_key(req_info[i].request);
-               if (!string_format(buf, "%-25s %s", key, req_info[i].help))
-                       continue;
 
-               view->ops->read(view, buf);
-       }
-}
+/*
+ * View opening
+ */
 
 enum open_flags {
        OPEN_DEFAULT = 0,       /* Use default view switching. */
@@ -2021,9 +2278,12 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                return;
        }
 
-       if (view == VIEW(REQ_VIEW_HELP)) {
-               open_help_view(view);
-
+       if (view->ops->open) {
+               if (!view->ops->open(view)) {
+                       report("Failed to load %s view", view->name);
+                       return;
+               }
+
        } else if ((reload || strcmp(view->vid, view->id)) &&
                   !begin_update(view)) {
                report("Failed to load %s view", view->name);
@@ -2081,6 +2341,103 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                update_view_title(view);
 }
 
+static void
+open_external_viewer(const char *cmd)
+{
+       def_prog_mode();           /* save current tty modes */
+       endwin();                  /* restore original tty modes */
+       system(cmd);
+       fprintf(stderr, "Press Enter to continue");
+       getc(stdin);
+       reset_prog_mode();
+       redraw_display();
+}
+
+static void
+open_mergetool(const char *file)
+{
+       char cmd[SIZEOF_STR];
+       char file_sq[SIZEOF_STR];
+
+       if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
+           string_format(cmd, "git mergetool %s", file_sq)) {
+               open_external_viewer(cmd);
+       }
+}
+
+static void
+open_editor(bool from_root, const char *file)
+{
+       char cmd[SIZEOF_STR];
+       char file_sq[SIZEOF_STR];
+       char *editor;
+       char *prefix = from_root ? opt_cdup : "";
+
+       editor = getenv("GIT_EDITOR");
+       if (!editor && *opt_editor)
+               editor = opt_editor;
+       if (!editor)
+               editor = getenv("VISUAL");
+       if (!editor)
+               editor = getenv("EDITOR");
+       if (!editor)
+               editor = "vi";
+
+       if (sq_quote(file_sq, 0, file) < sizeof(file_sq) &&
+           string_format(cmd, "%s %s%s", editor, prefix, file_sq)) {
+               open_external_viewer(cmd);
+       }
+}
+
+static void
+open_run_request(enum request request)
+{
+       struct run_request *req = get_run_request(request);
+       char buf[SIZEOF_STR * 2];
+       size_t bufpos;
+       char *cmd;
+
+       if (!req) {
+               report("Unknown run request");
+               return;
+       }
+
+       bufpos = 0;
+       cmd = req->cmd;
+
+       while (cmd) {
+               char *next = strstr(cmd, "%(");
+               int len = next - cmd;
+               char *value;
+
+               if (!next) {
+                       len = strlen(cmd);
+                       value = "";
+
+               } else if (!strncmp(next, "%(head)", 7)) {
+                       value = ref_head;
+
+               } else if (!strncmp(next, "%(commit)", 9)) {
+                       value = ref_commit;
+
+               } else if (!strncmp(next, "%(blob)", 7)) {
+                       value = ref_blob;
+
+               } else {
+                       report("Unknown replacement in run request: `%s`", req->cmd);
+                       return;
+               }
+
+               if (!string_format_from(buf, &bufpos, "%.*s%s", len, cmd, value))
+                       return;
+
+               if (next)
+                       next = strchr(next, ')') + 1;
+               cmd = next;
+       }
+
+       open_external_viewer(buf);
+}
 
 /*
  * User request switch noodle
@@ -2091,6 +2448,22 @@ view_driver(struct view *view, enum request request)
 {
        int i;
 
+       if (request == REQ_NONE) {
+               doupdate();
+               return TRUE;
+       }
+
+       if (request > REQ_NONE) {
+               open_run_request(request);
+               return TRUE;
+       }
+
+       if (view && view->lines) {
+               request = view->ops->request(view, request, &view->line[view->lineno]);
+               if (request == REQ_NONE)
+                       return TRUE;
+       }
+
        switch (request) {
        case REQ_MOVE_UP:
        case REQ_MOVE_DOWN:
@@ -2108,18 +2481,55 @@ view_driver(struct view *view, enum request request)
                scroll_view(view, request);
                break;
 
+       case REQ_VIEW_BLAME:
+               if (!opt_file[0]) {
+                       report("No file chosen, press %s to open tree view",
+                              get_key(REQ_VIEW_TREE));
+                       break;
+               }
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
        case REQ_VIEW_BLOB:
                if (!ref_blob[0]) {
-                       report("No file chosen, press 't' to open tree view");
+                       report("No file chosen, press %s to open tree view",
+                              get_key(REQ_VIEW_TREE));
                        break;
                }
-               /* Fall-through */
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
+       case REQ_VIEW_PAGER:
+               if (!opt_pipe && !VIEW(REQ_VIEW_PAGER)->lines) {
+                       report("No pager content, press %s to run command from prompt",
+                              get_key(REQ_PROMPT));
+                       break;
+               }
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
+       case REQ_VIEW_STAGE:
+               if (!VIEW(REQ_VIEW_STAGE)->lines) {
+                       report("No stage content, press %s to open the status view and choose file",
+                              get_key(REQ_VIEW_STATUS));
+                       break;
+               }
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
+       case REQ_VIEW_STATUS:
+               if (opt_is_inside_work_tree == FALSE) {
+                       report("The status view requires a working tree");
+                       break;
+               }
+               open_view(view, request, OPEN_DEFAULT);
+               break;
+
        case REQ_VIEW_MAIN:
        case REQ_VIEW_DIFF:
        case REQ_VIEW_LOG:
        case REQ_VIEW_TREE:
        case REQ_VIEW_HELP:
-       case REQ_VIEW_PAGER:
                open_view(view, request, OPEN_DEFAULT);
                break;
 
@@ -2129,24 +2539,27 @@ view_driver(struct view *view, enum request request)
 
                if ((view == VIEW(REQ_VIEW_DIFF) &&
                     view->parent == VIEW(REQ_VIEW_MAIN)) ||
+                  (view == VIEW(REQ_VIEW_DIFF) &&
+                    view->parent == VIEW(REQ_VIEW_BLAME)) ||
+                  (view == VIEW(REQ_VIEW_STAGE) &&
+                    view->parent == VIEW(REQ_VIEW_STATUS)) ||
                   (view == VIEW(REQ_VIEW_BLOB) &&
                     view->parent == VIEW(REQ_VIEW_TREE))) {
+                       int line;
+
                        view = view->parent;
+                       line = view->lineno;
                        move_view(view, request);
                        if (view_is_displayed(view))
                                update_view_title(view);
+                       if (line != view->lineno)
+                               view->ops->request(view, REQ_ENTER,
+                                                  &view->line[view->lineno]);
+
                } else {
                        move_view(view, request);
-                       break;
                }
-               /* Fall-through */
-
-       case REQ_ENTER:
-               if (!view->lines) {
-                       report("Nothing to enter");
-                       break;
-               }
-               return view->ops->enter(view, &view->line[view->lineno]);
+               break;
 
        case REQ_VIEW_NEXT:
        {
@@ -2164,16 +2577,35 @@ view_driver(struct view *view, enum request request)
                report("");
                break;
        }
+       case REQ_REFRESH:
+               report("Refreshing is not yet supported for the %s view", view->name);
+               break;
+
        case REQ_TOGGLE_LINENO:
                opt_line_number = !opt_line_number;
                redraw_display();
                break;
 
+       case REQ_TOGGLE_DATE:
+               opt_date = !opt_date;
+               redraw_display();
+               break;
+
+       case REQ_TOGGLE_AUTHOR:
+               opt_author = !opt_author;
+               redraw_display();
+               break;
+
        case REQ_TOGGLE_REV_GRAPH:
                opt_rev_graph = !opt_rev_graph;
                redraw_display();
                break;
 
+       case REQ_TOGGLE_REFS:
+               opt_show_refs = !opt_show_refs;
+               redraw_display();
+               break;
+
        case REQ_PROMPT:
                /* Always reload^Wrerun commands from the prompt. */
                open_view(view, opt_request, OPEN_RELOAD);
@@ -2199,7 +2631,7 @@ view_driver(struct view *view, enum request request)
                break;
 
        case REQ_SHOW_VERSION:
-               report("%s (built %s)", VERSION, __DATE__);
+               report("tig-%s (built %s)", TIG_VERSION, __DATE__);
                return TRUE;
 
        case REQ_SCREEN_RESIZE:
@@ -2209,9 +2641,15 @@ view_driver(struct view *view, enum request request)
                redraw_display();
                break;
 
-       case REQ_NONE:
-               doupdate();
-               return TRUE;
+       case REQ_EDIT:
+               report("Nothing to edit");
+               break;
+
+
+       case REQ_ENTER:
+               report("Nothing to enter");
+               break;
+
 
        case REQ_VIEW_CLOSE:
                /* XXX: Mark closed views by letting view->parent point to the
@@ -2250,7 +2688,6 @@ pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selec
 {
        char *text = line->data;
        enum line_type type = line->type;
-       int textlen = strlen(text);
        int attr;
 
        wmove(view->win, lineno, 0);
@@ -2303,13 +2740,7 @@ pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selec
                }
 
        } else {
-               int col = 0, pos = 0;
-
-               for (; pos < textlen && col < view->width; pos++, col++)
-                       if (text[pos] == '\t')
-                               col += TABSIZE - (col % TABSIZE) - 1;
-
-               waddnstr(view->win, text, pos);
+               draw_text(view, text, view->width, TRUE, selected);
        }
 
        return TRUE;
@@ -2347,7 +2778,7 @@ static void
 add_pager_refs(struct view *view, struct line *line)
 {
        char buf[SIZEOF_STR];
-       char *commit_id = line->data + STRING_SIZE("commit ");
+       char *commit_id = (char *)line->data + STRING_SIZE("commit ");
        struct ref **refs;
        size_t bufpos = 0, refpos = 0;
        const char *sep = "Refs: ";
@@ -2387,30 +2818,21 @@ try_add_describe_ref:
        if (!realloc_lines(view, view->line_size + 1))
                return;
 
-       line = &view->line[view->lines];
-       line->data = strdup(buf);
-       if (!line->data)
-               return;
-
-       line->type = LINE_PP_REFS;
-       view->lines++;
+       add_line_text(view, buf, LINE_PP_REFS);
 }
 
 static bool
 pager_read(struct view *view, char *data)
 {
-       struct line *line = &view->line[view->lines];
+       struct line *line;
 
        if (!data)
                return TRUE;
 
-       line->data = strdup(data);
-       if (!line->data)
+       line = add_line_text(view, data, get_line_type(data));
+       if (!line)
                return FALSE;
 
-       line->type = get_line_type(line->data);
-       view->lines++;
-
        if (line->type == LINE_COMMIT &&
            (view == VIEW(REQ_VIEW_DIFF) ||
             view == VIEW(REQ_VIEW_LOG)))
@@ -2419,11 +2841,14 @@ pager_read(struct view *view, char *data)
        return TRUE;
 }
 
-static bool
-pager_enter(struct view *view, struct line *line)
+static enum request
+pager_request(struct view *view, enum request request, struct line *line)
 {
        int split = 0;
 
+       if (request != REQ_ENTER)
+               return request;
+
        if (line->type == LINE_COMMIT &&
           (view == VIEW(REQ_VIEW_LOG) ||
            view == VIEW(REQ_VIEW_PAGER))) {
@@ -2442,7 +2867,7 @@ pager_enter(struct view *view, struct line *line)
        if (split)
                update_view_title(view);
 
-       return TRUE;
+       return REQ_NONE;
 }
 
 static bool
@@ -2464,18 +2889,106 @@ static void
 pager_select(struct view *view, struct line *line)
 {
        if (line->type == LINE_COMMIT) {
-               char *text = line->data;
+               char *text = (char *)line->data + STRING_SIZE("commit ");
 
-               string_copy(view->ref, text + STRING_SIZE("commit "));
-               string_copy(ref_commit, view->ref);
+               if (view != VIEW(REQ_VIEW_PAGER))
+                       string_copy_rev(view->ref, text);
+               string_copy_rev(ref_commit, text);
        }
 }
 
 static struct view_ops pager_ops = {
        "line",
-       pager_draw,
+       NULL,
        pager_read,
-       pager_enter,
+       pager_draw,
+       pager_request,
+       pager_grep,
+       pager_select,
+};
+
+
+/*
+ * Help backend
+ */
+
+static bool
+help_open(struct view *view)
+{
+       char buf[BUFSIZ];
+       int lines = ARRAY_SIZE(req_info) + 2;
+       int i;
+
+       if (view->lines > 0)
+               return TRUE;
+
+       for (i = 0; i < ARRAY_SIZE(req_info); i++)
+               if (!req_info[i].request)
+                       lines++;
+
+       lines += run_requests + 1;
+
+       view->line = calloc(lines, sizeof(*view->line));
+       if (!view->line)
+               return FALSE;
+
+       add_line_text(view, "Quick reference for tig keybindings:", LINE_DEFAULT);
+
+       for (i = 0; i < ARRAY_SIZE(req_info); i++) {
+               char *key;
+
+               if (req_info[i].request == REQ_NONE)
+                       continue;
+
+               if (!req_info[i].request) {
+                       add_line_text(view, "", LINE_DEFAULT);
+                       add_line_text(view, req_info[i].help, LINE_DEFAULT);
+                       continue;
+               }
+
+               key = get_key(req_info[i].request);
+               if (!*key)
+                       key = "(no key defined)";
+
+               if (!string_format(buf, "    %-25s %s", key, req_info[i].help))
+                       continue;
+
+               add_line_text(view, buf, LINE_DEFAULT);
+       }
+
+       if (run_requests) {
+               add_line_text(view, "", LINE_DEFAULT);
+               add_line_text(view, "External commands:", LINE_DEFAULT);
+       }
+
+       for (i = 0; i < run_requests; i++) {
+               struct run_request *req = get_run_request(REQ_NONE + i + 1);
+               char *key;
+
+               if (!req)
+                       continue;
+
+               key = get_key_name(req->key);
+               if (!*key)
+                       key = "(no key defined)";
+
+               if (!string_format(buf, "    %-10s %-14s `%s`",
+                                  keymap_table[req->keymap].name,
+                                  key, req->cmd))
+                       continue;
+
+               add_line_text(view, buf, LINE_DEFAULT);
+       }
+
+       return TRUE;
+}
+
+static struct view_ops help_ops = {
+       "line",
+       help_open,
+       NULL,
+       pager_draw,
+       pager_request,
        pager_grep,
        pager_select,
 };
@@ -2485,6 +2998,50 @@ static struct view_ops pager_ops = {
  * Tree backend
  */
 
+struct tree_stack_entry {
+       struct tree_stack_entry *prev;  /* Entry below this in the stack */
+       unsigned long lineno;           /* Line number to restore */
+       char *name;                     /* Position of name in opt_path */
+};
+
+/* The top of the path stack. */
+static struct tree_stack_entry *tree_stack = NULL;
+unsigned long tree_lineno = 0;
+
+static void
+pop_tree_stack_entry(void)
+{
+       struct tree_stack_entry *entry = tree_stack;
+
+       tree_lineno = entry->lineno;
+       entry->name[0] = 0;
+       tree_stack = entry->prev;
+       free(entry);
+}
+
+static void
+push_tree_stack_entry(char *name, unsigned long lineno)
+{
+       struct tree_stack_entry *entry = calloc(1, sizeof(*entry));
+       size_t pathlen = strlen(opt_path);
+
+       if (!entry)
+               return;
+
+       entry->prev = tree_stack;
+       entry->name = opt_path + pathlen;
+       tree_stack = entry;
+
+       if (!string_format_from(opt_path, &pathlen, "%s/", name)) {
+               pop_tree_stack_entry();
+               return;
+       }
+
+       /* Move the current line to the first tree entry. */
+       tree_lineno = 1;
+       entry->lineno = lineno;
+}
+
 /* Parse output from git-ls-tree(1):
  *
  * 100644 blob fb0e31ea6cc679b7379631188190e975f5789c26        Makefile
@@ -2511,183 +3068,1463 @@ tree_compare_entry(enum line_type type1, char *name1,
        return strcmp(name1, name2);
 }
 
+static char *
+tree_path(struct line *line)
+{
+       char *path = line->data;
+
+       return path + SIZEOF_TREE_ATTR;
+}
+
 static bool
 tree_read(struct view *view, char *text)
 {
-       size_t textlen = text ? strlen(text) : 0;
-       char buf[SIZEOF_STR];
-       unsigned long pos;
-       enum line_type type;
-       bool first_read = view->lines == 0;
+       size_t textlen = text ? strlen(text) : 0;
+       char buf[SIZEOF_STR];
+       unsigned long pos;
+       enum line_type type;
+       bool first_read = view->lines == 0;
+
+       if (!text)
+               return TRUE;
+       if (textlen <= SIZEOF_TREE_ATTR)
+               return FALSE;
+
+       type = text[STRING_SIZE("100644 ")] == 't'
+            ? LINE_TREE_DIR : LINE_TREE_FILE;
+
+       if (first_read) {
+               /* Add path info line */
+               if (!string_format(buf, "Directory path /%s", opt_path) ||
+                   !realloc_lines(view, view->line_size + 1) ||
+                   !add_line_text(view, buf, LINE_DEFAULT))
+                       return FALSE;
+
+               /* Insert "link" to parent directory. */
+               if (*opt_path) {
+                       if (!string_format(buf, TREE_UP_FORMAT, view->ref) ||
+                           !realloc_lines(view, view->line_size + 1) ||
+                           !add_line_text(view, buf, LINE_TREE_DIR))
+                               return FALSE;
+               }
+       }
+
+       /* Strip the path part ... */
+       if (*opt_path) {
+               size_t pathlen = textlen - SIZEOF_TREE_ATTR;
+               size_t striplen = strlen(opt_path);
+               char *path = text + SIZEOF_TREE_ATTR;
+
+               if (pathlen > striplen)
+                       memmove(path, path + striplen,
+                               pathlen - striplen + 1);
+       }
+
+       /* Skip "Directory ..." and ".." line. */
+       for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
+               struct line *line = &view->line[pos];
+               char *path1 = tree_path(line);
+               char *path2 = text + SIZEOF_TREE_ATTR;
+               int cmp = tree_compare_entry(line->type, path1, type, path2);
+
+               if (cmp <= 0)
+                       continue;
+
+               text = strdup(text);
+               if (!text)
+                       return FALSE;
+
+               if (view->lines > pos)
+                       memmove(&view->line[pos + 1], &view->line[pos],
+                               (view->lines - pos) * sizeof(*line));
+
+               line = &view->line[pos];
+               line->data = text;
+               line->type = type;
+               view->lines++;
+               return TRUE;
+       }
+
+       if (!add_line_text(view, text, type))
+               return FALSE;
+
+       if (tree_lineno > view->lineno) {
+               view->lineno = tree_lineno;
+               tree_lineno = 0;
+       }
+
+       return TRUE;
+}
+
+static enum request
+tree_request(struct view *view, enum request request, struct line *line)
+{
+       enum open_flags flags;
+
+       if (request == REQ_VIEW_BLAME) {
+               char *filename = tree_path(line);
+
+               if (line->type == LINE_TREE_DIR) {
+                       report("Cannot show blame for directory %s", opt_path);
+                       return REQ_NONE;
+               }
+
+               string_copy(opt_ref, view->vid);
+               string_format(opt_file, "%s%s", opt_path, filename);
+               return request;
+       }
+       if (request == REQ_TREE_PARENT) {
+               if (*opt_path) {
+                       /* fake 'cd  ..' */
+                       request = REQ_ENTER;
+                       line = &view->line[1];
+               } else {
+                       /* quit view if at top of tree */
+                       return REQ_VIEW_CLOSE;
+               }
+       }
+       if (request != REQ_ENTER)
+               return request;
+
+       /* Cleanup the stack if the tree view is at a different tree. */
+       while (!*opt_path && tree_stack)
+               pop_tree_stack_entry();
+
+       switch (line->type) {
+       case LINE_TREE_DIR:
+               /* Depending on whether it is a subdir or parent (updir?) link
+                * mangle the path buffer. */
+               if (line == &view->line[1] && *opt_path) {
+                       pop_tree_stack_entry();
+
+               } else {
+                       char *basename = tree_path(line);
+
+                       push_tree_stack_entry(basename, view->lineno);
+               }
+
+               /* Trees and subtrees share the same ID, so they are not not
+                * unique like blobs. */
+               flags = OPEN_RELOAD;
+               request = REQ_VIEW_TREE;
+               break;
+
+       case LINE_TREE_FILE:
+               flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
+               request = REQ_VIEW_BLOB;
+               break;
+
+       default:
+               return TRUE;
+       }
+
+       open_view(view, request, flags);
+       if (request == REQ_VIEW_TREE) {
+               view->lineno = tree_lineno;
+       }
+
+       return REQ_NONE;
+}
+
+static void
+tree_select(struct view *view, struct line *line)
+{
+       char *text = (char *)line->data + STRING_SIZE("100644 blob ");
+
+       if (line->type == LINE_TREE_FILE) {
+               string_copy_rev(ref_blob, text);
+
+       } else if (line->type != LINE_TREE_DIR) {
+               return;
+       }
+
+       string_copy_rev(view->ref, text);
+}
+
+static struct view_ops tree_ops = {
+       "file",
+       NULL,
+       tree_read,
+       pager_draw,
+       tree_request,
+       pager_grep,
+       tree_select,
+};
+
+static bool
+blob_read(struct view *view, char *line)
+{
+       if (!line)
+               return TRUE;
+       return add_line_text(view, line, LINE_DEFAULT) != NULL;
+}
+
+static struct view_ops blob_ops = {
+       "line",
+       NULL,
+       blob_read,
+       pager_draw,
+       pager_request,
+       pager_grep,
+       pager_select,
+};
+
+/*
+ * Blame backend
+ *
+ * Loading the blame view is a two phase job:
+ *
+ *  1. File content is read either using opt_file from the
+ *     filesystem or using git-cat-file.
+ *  2. Then blame information is incrementally added by
+ *     reading output from git-blame.
+ */
+
+struct blame_commit {
+       char id[SIZEOF_REV];            /* SHA1 ID. */
+       char title[128];                /* First line of the commit message. */
+       char author[75];                /* Author of the commit. */
+       struct tm time;                 /* Date from the author ident. */
+       char filename[128];             /* Name of file. */
+};
+
+struct blame {
+       struct blame_commit *commit;
+       unsigned int header:1;
+       char text[1];
+};
+
+#define BLAME_CAT_FILE_CMD "git cat-file blob %s:%s"
+#define BLAME_INCREMENTAL_CMD "git blame --incremental %s %s"
+
+static bool
+blame_open(struct view *view)
+{
+       char path[SIZEOF_STR];
+       char ref[SIZEOF_STR] = "";
+
+       if (sq_quote(path, 0, opt_file) >= sizeof(path))
+               return FALSE;
+
+       if (*opt_ref && sq_quote(ref, 0, opt_ref) >= sizeof(ref))
+               return FALSE;
+
+       if (*opt_ref) {
+               if (!string_format(view->cmd, BLAME_CAT_FILE_CMD, ref, path))
+                       return FALSE;
+       } else {
+               view->pipe = fopen(opt_file, "r");
+               if (!view->pipe &&
+                   !string_format(view->cmd, BLAME_CAT_FILE_CMD, "HEAD", path))
+                       return FALSE;
+       }
+
+       if (!view->pipe)
+               view->pipe = popen(view->cmd, "r");
+       if (!view->pipe)
+               return FALSE;
+
+       if (!string_format(view->cmd, BLAME_INCREMENTAL_CMD, ref, path))
+               return FALSE;
+
+       string_format(view->ref, "%s ...", opt_file);
+       string_copy_rev(view->vid, opt_file);
+       set_nonblocking_input(TRUE);
+
+       if (view->line) {
+               int i;
+
+               for (i = 0; i < view->lines; i++)
+                       free(view->line[i].data);
+               free(view->line);
+       }
+
+       view->lines = view->line_alloc = view->line_size = view->lineno = 0;
+       view->offset = view->lines  = view->lineno = 0;
+       view->line = NULL;
+       view->start_time = time(NULL);
+
+       return TRUE;
+}
+
+static struct blame_commit *
+get_blame_commit(struct view *view, const char *id)
+{
+       size_t i;
+
+       for (i = 0; i < view->lines; i++) {
+               struct blame *blame = view->line[i].data;
+
+               if (!blame->commit)
+                       continue;
+
+               if (!strncmp(blame->commit->id, id, SIZEOF_REV - 1))
+                       return blame->commit;
+       }
+
+       {
+               struct blame_commit *commit = calloc(1, sizeof(*commit));
+
+               if (commit)
+                       string_ncopy(commit->id, id, SIZEOF_REV);
+               return commit;
+       }
+}
+
+static bool
+parse_number(char **posref, size_t *number, size_t min, size_t max)
+{
+       char *pos = *posref;
+
+       *posref = NULL;
+       pos = strchr(pos + 1, ' ');
+       if (!pos || !isdigit(pos[1]))
+               return FALSE;
+       *number = atoi(pos + 1);
+       if (*number < min || *number > max)
+               return FALSE;
+
+       *posref = pos;
+       return TRUE;
+}
+
+static struct blame_commit *
+parse_blame_commit(struct view *view, char *text, int *blamed)
+{
+       struct blame_commit *commit;
+       struct blame *blame;
+       char *pos = text + SIZEOF_REV - 1;
+       size_t lineno;
+       size_t group;
+
+       if (strlen(text) <= SIZEOF_REV || *pos != ' ')
+               return NULL;
+
+       if (!parse_number(&pos, &lineno, 1, view->lines) ||
+           !parse_number(&pos, &group, 1, view->lines - lineno + 1))
+               return NULL;
+
+       commit = get_blame_commit(view, text);
+       if (!commit)
+               return NULL;
+
+       *blamed += group;
+       while (group--) {
+               struct line *line = &view->line[lineno + group - 1];
+
+               blame = line->data;
+               blame->commit = commit;
+               line->dirty = 1;
+       }
+       blame->header = 1;
+
+       return commit;
+}
+
+static bool
+blame_read_file(struct view *view, char *line)
+{
+       if (!line) {
+               FILE *pipe = NULL;
+
+               if (view->lines > 0)
+                       pipe = popen(view->cmd, "r");
+               view->cmd[0] = 0;
+               if (!pipe) {
+                       report("Failed to load blame data");
+                       return TRUE;
+               }
+
+               fclose(view->pipe);
+               view->pipe = pipe;
+               return FALSE;
+
+       } else {
+               size_t linelen = strlen(line);
+               struct blame *blame = malloc(sizeof(*blame) + linelen);
+
+               if (!line)
+                       return FALSE;
+
+               blame->commit = NULL;
+               strncpy(blame->text, line, linelen);
+               blame->text[linelen] = 0;
+               return add_line_data(view, blame, LINE_BLAME_COMMIT) != NULL;
+       }
+}
+
+static bool
+match_blame_header(const char *name, char **line)
+{
+       size_t namelen = strlen(name);
+       bool matched = !strncmp(name, *line, namelen);
+
+       if (matched)
+               *line += namelen;
+
+       return matched;
+}
+
+static bool
+blame_read(struct view *view, char *line)
+{
+       static struct blame_commit *commit = NULL;
+       static int blamed = 0;
+       static time_t author_time;
+
+       if (*view->cmd)
+               return blame_read_file(view, line);
+
+       if (!line) {
+               /* Reset all! */
+               commit = NULL;
+               blamed = 0;
+               string_format(view->ref, "%s", view->vid);
+               if (view_is_displayed(view)) {
+                       update_view_title(view);
+                       redraw_view_from(view, 0);
+               }
+               return TRUE;
+       }
+
+       if (!commit) {
+               commit = parse_blame_commit(view, line, &blamed);
+               string_format(view->ref, "%s %2d%%", view->vid,
+                             blamed * 100 / view->lines);
+
+       } else if (match_blame_header("author ", &line)) {
+               string_ncopy(commit->author, line, strlen(line));
+
+       } else if (match_blame_header("author-time ", &line)) {
+               author_time = (time_t) atol(line);
+
+       } else if (match_blame_header("author-tz ", &line)) {
+               long tz;
+
+               tz  = ('0' - line[1]) * 60 * 60 * 10;
+               tz += ('0' - line[2]) * 60 * 60;
+               tz += ('0' - line[3]) * 60;
+               tz += ('0' - line[4]) * 60;
+
+               if (line[0] == '-')
+                       tz = -tz;
+
+               author_time -= tz;
+               gmtime_r(&author_time, &commit->time);
+
+       } else if (match_blame_header("summary ", &line)) {
+               string_ncopy(commit->title, line, strlen(line));
+
+       } else if (match_blame_header("filename ", &line)) {
+               string_ncopy(commit->filename, line, strlen(line));
+               commit = NULL;
+       }
+
+       return TRUE;
+}
+
+static bool
+blame_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
+{
+       struct blame *blame = line->data;
+       int col = 0;
+
+       wmove(view->win, lineno, 0);
+
+       if (selected) {
+               wattrset(view->win, get_line_attr(LINE_CURSOR));
+               wchgat(view->win, -1, 0, LINE_CURSOR, NULL);
+       } else {
+               wattrset(view->win, A_NORMAL);
+       }
+
+       if (opt_date) {
+               int n;
+
+               if (!selected)
+                       wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
+               if (blame->commit) {
+                       char buf[DATE_COLS + 1];
+                       int timelen;
+
+                       timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &blame->commit->time);
+                       n = draw_text(view, buf, view->width - col, FALSE, selected);
+                       draw_text(view, " ", view->width - col - n, FALSE, selected);
+               }
+
+               col += DATE_COLS;
+               wmove(view->win, lineno, col);
+               if (col >= view->width)
+                       return TRUE;
+       }
+
+       if (opt_author) {
+               int max = MIN(AUTHOR_COLS - 1, view->width - col);
+
+               if (!selected)
+                       wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
+               if (blame->commit)
+                       draw_text(view, blame->commit->author, max, TRUE, selected);
+               col += AUTHOR_COLS;
+               if (col >= view->width)
+                       return TRUE;
+               wmove(view->win, lineno, col);
+       }
+
+       {
+               int max = MIN(ID_COLS - 1, view->width - col);
+
+               if (!selected)
+                       wattrset(view->win, get_line_attr(LINE_BLAME_ID));
+               if (blame->commit)
+                       draw_text(view, blame->commit->id, max, FALSE, -1);
+               col += ID_COLS;
+               if (col >= view->width)
+                       return TRUE;
+               wmove(view->win, lineno, col);
+       }
+
+       {
+               unsigned long real_lineno = view->offset + lineno + 1;
+               char number[10] = "          ";
+               int max = MIN(view->digits, STRING_SIZE(number));
+               bool showtrimmed = FALSE;
+
+               if (real_lineno == 1 ||
+                   (real_lineno % opt_num_interval) == 0) {
+                       char fmt[] = "%1ld";
+
+                       if (view->digits <= 9)
+                               fmt[1] = '0' + view->digits;
+
+                       if (!string_format(number, fmt, real_lineno))
+                               number[0] = 0;
+                       showtrimmed = TRUE;
+               }
+
+               if (max > view->width - col)
+                       max = view->width - col;
+               if (!selected)
+                       wattrset(view->win, get_line_attr(LINE_BLAME_LINENO));
+               col += draw_text(view, number, max, showtrimmed, selected);
+               if (col >= view->width)
+                       return TRUE;
+       }
+
+       if (!selected)
+               wattrset(view->win, A_NORMAL);
+
+       if (col >= view->width)
+               return TRUE;
+       waddch(view->win, ACS_VLINE);
+       col++;
+       if (col >= view->width)
+               return TRUE;
+       waddch(view->win, ' ');
+       col++;
+       col += draw_text(view, blame->text, view->width - col, TRUE, selected);
+
+       return TRUE;
+}
+
+static enum request
+blame_request(struct view *view, enum request request, struct line *line)
+{
+       enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
+       struct blame *blame = line->data;
+
+       switch (request) {
+       case REQ_ENTER:
+               if (!blame->commit) {
+                       report("No commit loaded yet");
+                       break;
+               }
+
+               if (!strcmp(blame->commit->id, NULL_ID)) {
+                       char path[SIZEOF_STR];
+
+                       if (sq_quote(path, 0, view->vid) >= sizeof(path))
+                               break;
+                       string_format(opt_cmd, "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s 2>/dev/null", path);
+               }
+
+               open_view(view, REQ_VIEW_DIFF, flags);
+               break;
+
+       default:
+               return request;
+       }
+
+       return REQ_NONE;
+}
+
+static bool
+blame_grep(struct view *view, struct line *line)
+{
+       struct blame *blame = line->data;
+       struct blame_commit *commit = blame->commit;
+       regmatch_t pmatch;
+
+#define MATCH(text) \
+       (*text && regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
+
+       if (commit) {
+               char buf[DATE_COLS + 1];
+
+               if (MATCH(commit->title) ||
+                   MATCH(commit->author) ||
+                   MATCH(commit->id))
+                       return TRUE;
+
+               if (strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time) &&
+                   MATCH(buf))
+                       return TRUE;
+       }
+
+       return MATCH(blame->text);
+
+#undef MATCH
+}
+
+static void
+blame_select(struct view *view, struct line *line)
+{
+       struct blame *blame = line->data;
+       struct blame_commit *commit = blame->commit;
+
+       if (!commit)
+               return;
+
+       if (!strcmp(commit->id, NULL_ID))
+               string_ncopy(ref_commit, "HEAD", 4);
+       else
+               string_copy_rev(ref_commit, commit->id);
+}
+
+static struct view_ops blame_ops = {
+       "line",
+       blame_open,
+       blame_read,
+       blame_draw,
+       blame_request,
+       blame_grep,
+       blame_select,
+};
+
+/*
+ * Status backend
+ */
+
+struct status {
+       char status;
+       struct {
+               mode_t mode;
+               char rev[SIZEOF_REV];
+               char name[SIZEOF_STR];
+       } old;
+       struct {
+               mode_t mode;
+               char rev[SIZEOF_REV];
+               char name[SIZEOF_STR];
+       } new;
+};
+
+static char status_onbranch[SIZEOF_STR];
+static struct status stage_status;
+static enum line_type stage_line_type;
+
+/* Get fields from the diff line:
+ * :100644 100644 06a5d6ae9eca55be2e0e585a152e6b1336f2b20e 0000000000000000000000000000000000000000 M
+ */
+static inline bool
+status_get_diff(struct status *file, char *buf, size_t bufsize)
+{
+       char *old_mode = buf +  1;
+       char *new_mode = buf +  8;
+       char *old_rev  = buf + 15;
+       char *new_rev  = buf + 56;
+       char *status   = buf + 97;
+
+       if (bufsize < 99 ||
+           old_mode[-1] != ':' ||
+           new_mode[-1] != ' ' ||
+           old_rev[-1]  != ' ' ||
+           new_rev[-1]  != ' ' ||
+           status[-1]   != ' ')
+               return FALSE;
+
+       file->status = *status;
+
+       string_copy_rev(file->old.rev, old_rev);
+       string_copy_rev(file->new.rev, new_rev);
+
+       file->old.mode = strtoul(old_mode, NULL, 8);
+       file->new.mode = strtoul(new_mode, NULL, 8);
+
+       file->old.name[0] = file->new.name[0] = 0;
+
+       return TRUE;
+}
+
+static bool
+status_run(struct view *view, const char cmd[], char status, enum line_type type)
+{
+       struct status *file = NULL;
+       struct status *unmerged = NULL;
+       char buf[SIZEOF_STR * 4];
+       size_t bufsize = 0;
+       FILE *pipe;
+
+       pipe = popen(cmd, "r");
+       if (!pipe)
+               return FALSE;
+
+       add_line_data(view, NULL, type);
+
+       while (!feof(pipe) && !ferror(pipe)) {
+               char *sep;
+               size_t readsize;
+
+               readsize = fread(buf + bufsize, 1, sizeof(buf) - bufsize, pipe);
+               if (!readsize)
+                       break;
+               bufsize += readsize;
+
+               /* Process while we have NUL chars. */
+               while ((sep = memchr(buf, 0, bufsize))) {
+                       size_t sepsize = sep - buf + 1;
+
+                       if (!file) {
+                               if (!realloc_lines(view, view->line_size + 1))
+                                       goto error_out;
+
+                               file = calloc(1, sizeof(*file));
+                               if (!file)
+                                       goto error_out;
+
+                               add_line_data(view, file, type);
+                       }
+
+                       /* Parse diff info part. */
+                       if (status) {
+                               file->status = status;
+                               if (status == 'A')
+                                       string_copy(file->old.rev, NULL_ID);
+
+                       } else if (!file->status) {
+                               if (!status_get_diff(file, buf, sepsize))
+                                       goto error_out;
+
+                               bufsize -= sepsize;
+                               memmove(buf, sep + 1, bufsize);
+
+                               sep = memchr(buf, 0, bufsize);
+                               if (!sep)
+                                       break;
+                               sepsize = sep - buf + 1;
+
+                               /* Collapse all 'M'odified entries that
+                                * follow a associated 'U'nmerged entry.
+                                */
+                               if (file->status == 'U') {
+                                       unmerged = file;
+
+                               } else if (unmerged) {
+                                       int collapse = !strcmp(buf, unmerged->new.name);
+
+                                       unmerged = NULL;
+                                       if (collapse) {
+                                               free(file);
+                                               view->lines--;
+                                               continue;
+                                       }
+                               }
+                       }
+
+                       /* Grab the old name for rename/copy. */
+                       if (!*file->old.name &&
+                           (file->status == 'R' || file->status == 'C')) {
+                               sepsize = sep - buf + 1;
+                               string_ncopy(file->old.name, buf, sepsize);
+                               bufsize -= sepsize;
+                               memmove(buf, sep + 1, bufsize);
+
+                               sep = memchr(buf, 0, bufsize);
+                               if (!sep)
+                                       break;
+                               sepsize = sep - buf + 1;
+                       }
+
+                       /* git-ls-files just delivers a NUL separated
+                        * list of file names similar to the second half
+                        * of the git-diff-* output. */
+                       string_ncopy(file->new.name, buf, sepsize);
+                       if (!*file->old.name)
+                               string_copy(file->old.name, file->new.name);
+                       bufsize -= sepsize;
+                       memmove(buf, sep + 1, bufsize);
+                       file = NULL;
+               }
+       }
+
+       if (ferror(pipe)) {
+error_out:
+               pclose(pipe);
+               return FALSE;
+       }
+
+       if (!view->line[view->lines - 1].data)
+               add_line_data(view, NULL, LINE_STAT_NONE);
+
+       pclose(pipe);
+       return TRUE;
+}
+
+/* Don't show unmerged entries in the staged section. */
+#define STATUS_DIFF_INDEX_CMD "git diff-index -z --diff-filter=ACDMRTXB --cached -M HEAD"
+#define STATUS_DIFF_FILES_CMD "git diff-files -z"
+#define STATUS_LIST_OTHER_CMD \
+       "git ls-files -z --others --exclude-per-directory=.gitignore"
+#define STATUS_LIST_NO_HEAD_CMD \
+       "git ls-files -z --cached --exclude-per-directory=.gitignore"
+
+#define STATUS_DIFF_INDEX_SHOW_CMD \
+       "git diff-index --root --patch-with-stat -C -M --cached HEAD -- %s %s 2>/dev/null"
+
+#define STATUS_DIFF_FILES_SHOW_CMD \
+       "git diff-files --root --patch-with-stat -C -M -- %s %s 2>/dev/null"
+
+#define STATUS_DIFF_NO_HEAD_SHOW_CMD \
+       "git diff --no-color --patch-with-stat /dev/null %s 2>/dev/null"
+
+/* First parse staged info using git-diff-index(1), then parse unstaged
+ * info using git-diff-files(1), and finally untracked files using
+ * git-ls-files(1). */
+static bool
+status_open(struct view *view)
+{
+       struct stat statbuf;
+       char exclude[SIZEOF_STR];
+       char indexcmd[SIZEOF_STR] = STATUS_DIFF_INDEX_CMD;
+       char othercmd[SIZEOF_STR] = STATUS_LIST_OTHER_CMD;
+       unsigned long prev_lineno = view->lineno;
+       char indexstatus = 0;
+       size_t i;
+
+       for (i = 0; i < view->lines; i++)
+               free(view->line[i].data);
+       free(view->line);
+       view->lines = view->line_alloc = view->line_size = view->lineno = 0;
+       view->line = NULL;
+
+       if (!realloc_lines(view, view->line_size + 7))
+               return FALSE;
+
+       add_line_data(view, NULL, LINE_STAT_HEAD);
+       if (opt_no_head)
+               string_copy(status_onbranch, "Initial commit");
+       else if (!*opt_head)
+               string_copy(status_onbranch, "Not currently on any branch");
+       else if (!string_format(status_onbranch, "On branch %s", opt_head))
+               return FALSE;
+
+       if (opt_no_head) {
+               string_copy(indexcmd, STATUS_LIST_NO_HEAD_CMD);
+               indexstatus = 'A';
+       }
+
+       if (!string_format(exclude, "%s/info/exclude", opt_git_dir))
+               return FALSE;
+
+       if (stat(exclude, &statbuf) >= 0) {
+               size_t cmdsize = strlen(othercmd);
+
+               if (!string_format_from(othercmd, &cmdsize, " %s", "--exclude-from=") ||
+                   sq_quote(othercmd, cmdsize, exclude) >= sizeof(othercmd))
+                       return FALSE;
+
+               cmdsize = strlen(indexcmd);
+               if (opt_no_head &&
+                   (!string_format_from(indexcmd, &cmdsize, " %s", "--exclude-from=") ||
+                    sq_quote(indexcmd, cmdsize, exclude) >= sizeof(indexcmd)))
+                       return FALSE;
+       }
+
+       system("git update-index -q --refresh");
+
+       if (!status_run(view, indexcmd, indexstatus, LINE_STAT_STAGED) ||
+           !status_run(view, STATUS_DIFF_FILES_CMD, 0, LINE_STAT_UNSTAGED) ||
+           !status_run(view, othercmd, '?', LINE_STAT_UNTRACKED))
+               return FALSE;
+
+       /* If all went well restore the previous line number to stay in
+        * the context or select a line with something that can be
+        * updated. */
+       if (prev_lineno >= view->lines)
+               prev_lineno = view->lines - 1;
+       while (prev_lineno < view->lines && !view->line[prev_lineno].data)
+               prev_lineno++;
+
+       /* If the above fails, always skip the "On branch" line. */
+       if (prev_lineno < view->lines)
+               view->lineno = prev_lineno;
+       else
+               view->lineno = 1;
+
+       return TRUE;
+}
+
+static bool
+status_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
+{
+       struct status *status = line->data;
+
+       wmove(view->win, lineno, 0);
+
+       if (selected) {
+               wattrset(view->win, get_line_attr(LINE_CURSOR));
+               wchgat(view->win, -1, 0, LINE_CURSOR, NULL);
+
+       } else if (line->type == LINE_STAT_HEAD) {
+               wattrset(view->win, get_line_attr(LINE_STAT_HEAD));
+               wchgat(view->win, -1, 0, LINE_STAT_HEAD, NULL);
+
+       } else if (!status && line->type != LINE_STAT_NONE) {
+               wattrset(view->win, get_line_attr(LINE_STAT_SECTION));
+               wchgat(view->win, -1, 0, LINE_STAT_SECTION, NULL);
+
+       } else {
+               wattrset(view->win, get_line_attr(line->type));
+       }
+
+       if (!status) {
+               char *text;
+
+               switch (line->type) {
+               case LINE_STAT_STAGED:
+                       text = "Changes to be committed:";
+                       break;
+
+               case LINE_STAT_UNSTAGED:
+                       text = "Changed but not updated:";
+                       break;
+
+               case LINE_STAT_UNTRACKED:
+                       text = "Untracked files:";
+                       break;
+
+               case LINE_STAT_NONE:
+                       text = "    (no files)";
+                       break;
+
+               case LINE_STAT_HEAD:
+                       text = status_onbranch;
+                       break;
+
+               default:
+                       return FALSE;
+               }
+
+               draw_text(view, text, view->width, TRUE, selected);
+               return TRUE;
+       }
+
+       waddch(view->win, status->status);
+       if (!selected)
+               wattrset(view->win, A_NORMAL);
+       wmove(view->win, lineno, 4);
+       if (view->width < 5)
+               return TRUE;
+
+       draw_text(view, status->new.name, view->width - 5, TRUE, selected);
+       return TRUE;
+}
+
+static enum request
+status_enter(struct view *view, struct line *line)
+{
+       struct status *status = line->data;
+       char oldpath[SIZEOF_STR] = "";
+       char newpath[SIZEOF_STR] = "";
+       char *info;
+       size_t cmdsize = 0;
+
+       if (line->type == LINE_STAT_NONE ||
+           (!status && line[1].type == LINE_STAT_NONE)) {
+               report("No file to diff");
+               return REQ_NONE;
+       }
+
+       if (status) {
+               if (sq_quote(oldpath, 0, status->old.name) >= sizeof(oldpath))
+                       return REQ_QUIT;
+               /* Diffs for unmerged entries are empty when pasing the
+                * new path, so leave it empty. */
+               if (status->status != 'U' &&
+                   sq_quote(newpath, 0, status->new.name) >= sizeof(newpath))
+                       return REQ_QUIT;
+       }
+
+       if (opt_cdup[0] &&
+           line->type != LINE_STAT_UNTRACKED &&
+           !string_format_from(opt_cmd, &cmdsize, "cd %s;", opt_cdup))
+               return REQ_QUIT;
+
+       switch (line->type) {
+       case LINE_STAT_STAGED:
+               if (opt_no_head) {
+                       if (!string_format_from(opt_cmd, &cmdsize,
+                                               STATUS_DIFF_NO_HEAD_SHOW_CMD,
+                                               newpath))
+                               return REQ_QUIT;
+               } else {
+                       if (!string_format_from(opt_cmd, &cmdsize,
+                                               STATUS_DIFF_INDEX_SHOW_CMD,
+                                               oldpath, newpath))
+                               return REQ_QUIT;
+               }
+
+               if (status)
+                       info = "Staged changes to %s";
+               else
+                       info = "Staged changes";
+               break;
+
+       case LINE_STAT_UNSTAGED:
+               if (!string_format_from(opt_cmd, &cmdsize,
+                                       STATUS_DIFF_FILES_SHOW_CMD, oldpath, newpath))
+                       return REQ_QUIT;
+               if (status)
+                       info = "Unstaged changes to %s";
+               else
+                       info = "Unstaged changes";
+               break;
+
+       case LINE_STAT_UNTRACKED:
+               if (opt_pipe)
+                       return REQ_QUIT;
+
+               if (!status) {
+                       report("No file to show");
+                       return REQ_NONE;
+               }
+
+               opt_pipe = fopen(status->new.name, "r");
+               info = "Untracked file %s";
+               break;
+
+       case LINE_STAT_HEAD:
+               return REQ_NONE;
+
+       default:
+               die("line type %d not handled in switch", line->type);
+       }
+
+       open_view(view, REQ_VIEW_STAGE, OPEN_RELOAD | OPEN_SPLIT);
+       if (view_is_displayed(VIEW(REQ_VIEW_STAGE))) {
+               if (status) {
+                       stage_status = *status;
+               } else {
+                       memset(&stage_status, 0, sizeof(stage_status));
+               }
+
+               stage_line_type = line->type;
+               string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.new.name);
+       }
+
+       return REQ_NONE;
+}
+
+
+static bool
+status_update_file(struct view *view, struct status *status, enum line_type type)
+{
+       char cmd[SIZEOF_STR];
+       char buf[SIZEOF_STR];
+       size_t cmdsize = 0;
+       size_t bufsize = 0;
+       size_t written = 0;
+       FILE *pipe;
+
+       if (opt_cdup[0] &&
+           type != LINE_STAT_UNTRACKED &&
+           !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
+               return FALSE;
+
+       switch (type) {
+       case LINE_STAT_STAGED:
+               if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
+                                       status->old.mode,
+                                       status->old.rev,
+                                       status->old.name, 0))
+                       return FALSE;
+
+               string_add(cmd, cmdsize, "git update-index -z --index-info");
+               break;
+
+       case LINE_STAT_UNSTAGED:
+       case LINE_STAT_UNTRACKED:
+               if (!string_format_from(buf, &bufsize, "%s%c", status->new.name, 0))
+                       return FALSE;
+
+               string_add(cmd, cmdsize, "git update-index -z --add --remove --stdin");
+               break;
+
+       case LINE_STAT_HEAD:
+               return TRUE;
+
+       default:
+               die("line type %d not handled in switch", type);
+       }
+
+       pipe = popen(cmd, "w");
+       if (!pipe)
+               return FALSE;
+
+       while (!ferror(pipe) && written < bufsize) {
+               written += fwrite(buf + written, 1, bufsize - written, pipe);
+       }
+
+       pclose(pipe);
+
+       if (written != bufsize)
+               return FALSE;
+
+       return TRUE;
+}
+
+static void
+status_update(struct view *view)
+{
+       struct line *line = &view->line[view->lineno];
+
+       assert(view->lines);
+
+       if (!line->data) {
+               while (++line < view->line + view->lines && line->data) {
+                       if (!status_update_file(view, line->data, line->type))
+                               report("Failed to update file status");
+               }
+
+               if (!line[-1].data) {
+                       report("Nothing to update");
+                       return;
+               }
+
+       } else if (!status_update_file(view, line->data, line->type)) {
+               report("Failed to update file status");
+       }
+}
+
+static enum request
+status_request(struct view *view, enum request request, struct line *line)
+{
+       struct status *status = line->data;
+
+       switch (request) {
+       case REQ_STATUS_UPDATE:
+               status_update(view);
+               break;
+
+       case REQ_STATUS_MERGE:
+               if (!status || status->status != 'U') {
+                       report("Merging only possible for files with unmerged status ('U').");
+                       return REQ_NONE;
+               }
+               open_mergetool(status->new.name);
+               break;
+
+       case REQ_EDIT:
+               if (!status)
+                       return request;
+
+               open_editor(status->status != '?', status->new.name);
+               break;
+
+       case REQ_VIEW_BLAME:
+               if (status) {
+                       string_copy(opt_file, status->new.name);
+                       opt_ref[0] = 0;
+               }
+               return request;
+
+       case REQ_ENTER:
+               /* After returning the status view has been split to
+                * show the stage view. No further reloading is
+                * necessary. */
+               status_enter(view, line);
+               return REQ_NONE;
+
+       case REQ_REFRESH:
+               /* Simply reload the view. */
+               break;
+
+       default:
+               return request;
+       }
+
+       open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD);
+
+       return REQ_NONE;
+}
+
+static void
+status_select(struct view *view, struct line *line)
+{
+       struct status *status = line->data;
+       char file[SIZEOF_STR] = "all files";
+       char *text;
+       char *key;
+
+       if (status && !string_format(file, "'%s'", status->new.name))
+               return;
+
+       if (!status && line[1].type == LINE_STAT_NONE)
+               line++;
+
+       switch (line->type) {
+       case LINE_STAT_STAGED:
+               text = "Press %s to unstage %s for commit";
+               break;
+
+       case LINE_STAT_UNSTAGED:
+               text = "Press %s to stage %s for commit";
+               break;
+
+       case LINE_STAT_UNTRACKED:
+               text = "Press %s to stage %s for addition";
+               break;
+
+       case LINE_STAT_HEAD:
+       case LINE_STAT_NONE:
+               text = "Nothing to update";
+               break;
+
+       default:
+               die("line type %d not handled in switch", line->type);
+       }
+
+       if (status && status->status == 'U') {
+               text = "Press %s to resolve conflict in %s";
+               key = get_key(REQ_STATUS_MERGE);
+
+       } else {
+               key = get_key(REQ_STATUS_UPDATE);
+       }
+
+       string_format(view->ref, text, key, file);
+}
+
+static bool
+status_grep(struct view *view, struct line *line)
+{
+       struct status *status = line->data;
+       enum { S_STATUS, S_NAME, S_END } state;
+       char buf[2] = "?";
+       regmatch_t pmatch;
 
-       if (textlen <= SIZEOF_TREE_ATTR)
+       if (!status)
                return FALSE;
 
-       type = text[STRING_SIZE("100644 ")] == 't'
-            ? LINE_TREE_DIR : LINE_TREE_FILE;
+       for (state = S_STATUS; state < S_END; state++) {
+               char *text;
 
-       if (first_read) {
-               /* Add path info line */
-               if (string_format(buf, "Directory path /%s", opt_path) &&
-                   realloc_lines(view, view->line_size + 1) &&
-                   pager_read(view, buf))
-                       view->line[view->lines - 1].type = LINE_DEFAULT;
-               else
-                       return FALSE;
+               switch (state) {
+               case S_NAME:    text = status->new.name;        break;
+               case S_STATUS:
+                       buf[0] = status->status;
+                       text = buf;
+                       break;
 
-               /* Insert "link" to parent directory. */
-               if (*opt_path &&
-                   string_format(buf, TREE_UP_FORMAT, view->ref) &&
-                   realloc_lines(view, view->line_size + 1) &&
-                   pager_read(view, buf))
-                       view->line[view->lines - 1].type = LINE_TREE_DIR;
-               else if (*opt_path)
+               default:
                        return FALSE;
-       }
-
-       /* Strip the path part ... */
-       if (*opt_path) {
-               size_t pathlen = textlen - SIZEOF_TREE_ATTR;
-               size_t striplen = strlen(opt_path);
-               char *path = text + SIZEOF_TREE_ATTR;
+               }
 
-               if (pathlen > striplen)
-                       memmove(path, path + striplen,
-                               pathlen - striplen + 1);
+               if (regexec(view->regex, text, 1, &pmatch, 0) != REG_NOMATCH)
+                       return TRUE;
        }
 
-       /* Skip "Directory ..." and ".." line. */
-       for (pos = 1 + !!*opt_path; pos < view->lines; pos++) {
-               struct line *line = &view->line[pos];
-               char *path1 = ((char *) line->data) + SIZEOF_TREE_ATTR;
-               char *path2 = text + SIZEOF_TREE_ATTR;
-               int cmp = tree_compare_entry(line->type, path1, type, path2);
+       return FALSE;
+}
 
-               if (cmp <= 0)
-                       continue;
+static struct view_ops status_ops = {
+       "file",
+       status_open,
+       NULL,
+       status_draw,
+       status_request,
+       status_grep,
+       status_select,
+};
 
-               text = strdup(text);
-               if (!text)
-                       return FALSE;
 
-               if (view->lines > pos)
-                       memmove(&view->line[pos + 1], &view->line[pos],
-                               (view->lines - pos) * sizeof(*line));
+static bool
+stage_diff_line(FILE *pipe, struct line *line)
+{
+       char *buf = line->data;
+       size_t bufsize = strlen(buf);
+       size_t written = 0;
 
-               line = &view->line[pos];
-               line->data = text;
-               line->type = type;
-               view->lines++;
-               return TRUE;
+       while (!ferror(pipe) && written < bufsize) {
+               written += fwrite(buf + written, 1, bufsize - written, pipe);
        }
 
-       if (!pager_read(view, text))
-               return FALSE;
+       fputc('\n', pipe);
 
-       /* Move the current line to the first tree entry. */
-       if (first_read)
-               view->lineno++;
+       return written == bufsize;
+}
 
-       view->line[view->lines - 1].type = type;
-       return TRUE;
+static struct line *
+stage_diff_hdr(struct view *view, struct line *line)
+{
+       int diff_hdr_dir = line->type == LINE_DIFF_CHUNK ? -1 : 1;
+       struct line *diff_hdr;
+
+       if (line->type == LINE_DIFF_CHUNK)
+               diff_hdr = line - 1;
+       else
+               diff_hdr = view->line + 1;
+
+       while (diff_hdr > view->line && diff_hdr < view->line + view->lines) {
+               if (diff_hdr->type == LINE_DIFF_HEADER)
+                       return diff_hdr;
+
+               diff_hdr += diff_hdr_dir;
+       }
+
+       return NULL;
 }
 
 static bool
-tree_enter(struct view *view, struct line *line)
+stage_update_chunk(struct view *view, struct line *line)
 {
-       enum open_flags flags;
-       enum request request;
+       char cmd[SIZEOF_STR];
+       size_t cmdsize = 0;
+       struct line *diff_hdr, *diff_chunk, *diff_end;
+       FILE *pipe;
 
-       switch (line->type) {
-       case LINE_TREE_DIR:
-               /* Depending on whether it is a subdir or parent (updir?) link
-                * mangle the path buffer. */
-               if (line == &view->line[1] && *opt_path) {
-                       size_t path_len = strlen(opt_path);
-                       char *dirsep = opt_path + path_len - 1;
+       diff_hdr = stage_diff_hdr(view, line);
+       if (!diff_hdr)
+               return FALSE;
 
-                       while (dirsep > opt_path && dirsep[-1] != '/')
-                               dirsep--;
+       if (opt_cdup[0] &&
+           !string_format_from(cmd, &cmdsize, "cd %s;", opt_cdup))
+               return FALSE;
 
-                       dirsep[0] = 0;
+       if (!string_format_from(cmd, &cmdsize,
+                               "git apply --cached %s - && "
+                               "git update-index -q --unmerged --refresh 2>/dev/null",
+                               stage_line_type == LINE_STAT_STAGED ? "-R" : ""))
+               return FALSE;
 
-               } else {
-                       size_t pathlen = strlen(opt_path);
-                       size_t origlen = pathlen;
-                       char *data = line->data;
-                       char *basename = data + SIZEOF_TREE_ATTR;
+       pipe = popen(cmd, "w");
+       if (!pipe)
+               return FALSE;
 
-                       if (!string_format_from(opt_path, &pathlen, "%s/", basename)) {
-                               opt_path[origlen] = 0;
-                               return TRUE;
-                       }
-               }
+       diff_end = view->line + view->lines;
+       if (line->type != LINE_DIFF_CHUNK) {
+               diff_chunk = diff_hdr;
 
-               /* Trees and subtrees share the same ID, so they are not not
-                * unique like blobs. */
-               flags = OPEN_RELOAD;
-               request = REQ_VIEW_TREE;
-               break;
+       } else {
+               for (diff_chunk = line + 1; diff_chunk < diff_end; diff_chunk++)
+                       if (diff_chunk->type == LINE_DIFF_CHUNK ||
+                           diff_chunk->type == LINE_DIFF_HEADER)
+                               diff_end = diff_chunk;
+
+               diff_chunk = line;
+
+               while (diff_hdr->type != LINE_DIFF_CHUNK) {
+                       switch (diff_hdr->type) {
+                       case LINE_DIFF_HEADER:
+                       case LINE_DIFF_INDEX:
+                       case LINE_DIFF_ADD:
+                       case LINE_DIFF_DEL:
+                               break;
 
-       case LINE_TREE_FILE:
-               flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
-               request = REQ_VIEW_BLOB;
-               break;
+                       default:
+                               diff_hdr++;
+                               continue;
+                       }
 
-       default:
-               return TRUE;
+                       if (!stage_diff_line(pipe, diff_hdr++)) {
+                               pclose(pipe);
+                               return FALSE;
+                       }
+               }
        }
 
-       open_view(view, request, flags);
+       while (diff_chunk < diff_end && stage_diff_line(pipe, diff_chunk))
+               diff_chunk++;
+
+       pclose(pipe);
+
+       if (diff_chunk != diff_end)
+               return FALSE;
 
        return TRUE;
 }
 
 static void
-tree_select(struct view *view, struct line *line)
+stage_update(struct view *view, struct line *line)
 {
-       char *text = line->data;
-
-       text += STRING_SIZE("100644 blob ");
-
-       if (line->type == LINE_TREE_FILE) {
-               string_ncopy(ref_blob, text, 40);
-               /* Also update the blob view's ref, since all there must always
-                * be in sync. */
-               string_copy(VIEW(REQ_VIEW_BLOB)->ref, ref_blob);
+       if (!opt_no_head && stage_line_type != LINE_STAT_UNTRACKED &&
+           (line->type == LINE_DIFF_CHUNK || !stage_status.status)) {
+               if (!stage_update_chunk(view, line)) {
+                       report("Failed to apply chunk");
+                       return;
+               }
 
-       } else if (line->type != LINE_TREE_DIR) {
+       } else if (!status_update_file(view, &stage_status, stage_line_type)) {
+               report("Failed to update file");
                return;
        }
 
-       string_ncopy(view->ref, text, 40);
-}
+       open_view(view, REQ_VIEW_STATUS, OPEN_RELOAD);
 
-static struct view_ops tree_ops = {
-       "file",
-       pager_draw,
-       tree_read,
-       tree_enter,
-       pager_grep,
-       tree_select,
-};
+       view = VIEW(REQ_VIEW_STATUS);
+       if (view_is_displayed(view))
+               status_enter(view, &view->line[view->lineno]);
+}
 
-static bool
-blob_read(struct view *view, char *line)
+static enum request
+stage_request(struct view *view, enum request request, struct line *line)
 {
-       bool state = pager_read(view, line);
+       switch (request) {
+       case REQ_STATUS_UPDATE:
+               stage_update(view, line);
+               break;
 
-       if (state == TRUE)
-               view->line[view->lines - 1].type = LINE_DEFAULT;
+       case REQ_EDIT:
+               if (!stage_status.new.name[0])
+                       return request;
 
-       return state;
+               open_editor(stage_status.status != '?', stage_status.new.name);
+               break;
+
+       case REQ_VIEW_BLAME:
+               if (stage_status.new.name[0]) {
+                       string_copy(opt_file, stage_status.new.name);
+                       opt_ref[0] = 0;
+               }
+               return request;
+
+       case REQ_ENTER:
+               pager_request(view, request, line);
+               break;
+
+       default:
+               return request;
+       }
+
+       return REQ_NONE;
 }
 
-static struct view_ops blob_ops = {
+static struct view_ops stage_ops = {
        "line",
+       NULL,
+       pager_read,
        pager_draw,
-       blob_read,
-       pager_enter,
+       stage_request,
        pager_grep,
        pager_select,
 };
@@ -2705,6 +4542,7 @@ struct commit {
        struct ref **refs;              /* Repository references. */
        chtype graph[SIZEOF_REVGRAPH];  /* Ancestry chain graphics. */
        size_t graph_size;              /* The width of the graph array. */
+       bool has_parents;               /* Rewritten --parents seen. */
 };
 
 /* Size of rev graph with no  "padding" columns */
@@ -2716,6 +4554,7 @@ struct rev_graph {
        size_t size;
        struct commit *commit;
        size_t pos;
+       unsigned int boundary:1;
 };
 
 /* Parents of the commit being visualized. */
@@ -2779,7 +4618,7 @@ push_rev_graph(struct rev_graph *graph, char *parent)
                        return;
 
        if (graph->size < SIZEOF_REVITEMS) {
-               string_ncopy(graph->rev[graph->size++], parent, SIZEOF_REV);
+               string_copy_rev(graph->rev[graph->size++], parent);
        }
 }
 
@@ -2788,7 +4627,9 @@ get_rev_graph_symbol(struct rev_graph *graph)
 {
        chtype symbol;
 
-       if (graph->parents->size == 0)
+       if (graph->boundary)
+               symbol = REVGRAPH_BOUND;
+       else if (graph->parents->size == 0)
                symbol = REVGRAPH_INIT;
        else if (graph_parent_is_merge(graph))
                symbol = REVGRAPH_MERGE;
@@ -2870,7 +4711,7 @@ prepare_rev_graph(struct rev_graph *graph)
        }
 
        /* Interleave the new revision parent(s). */
-       for (i = 0; i < graph->parents->size; i++)
+       for (i = 0; !graph->boundary && i < graph->parents->size; i++)
                push_rev_graph(graph->next, graph->parents->rev[i]);
 
        /* Lastly, put any remaining revisions. */
@@ -2907,105 +4748,107 @@ main_draw(struct view *view, struct line *line, unsigned int lineno, bool select
        enum line_type type;
        int col = 0;
        size_t timelen;
-       size_t authorlen;
-       int trimmed = 1;
+       int space;
 
        if (!*commit->author)
                return FALSE;
 
+       space = view->width;
        wmove(view->win, lineno, col);
 
        if (selected) {
                type = LINE_CURSOR;
                wattrset(view->win, get_line_attr(type));
                wchgat(view->win, -1, 0, type, NULL);
-
        } else {
                type = LINE_MAIN_COMMIT;
                wattrset(view->win, get_line_attr(LINE_MAIN_DATE));
        }
 
-       timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
-       waddnstr(view->win, buf, timelen);
-       waddstr(view->win, " ");
+       if (opt_date) {
+               int n;
 
-       col += DATE_COLS;
-       wmove(view->win, lineno, col);
+               timelen = strftime(buf, sizeof(buf), DATE_FORMAT, &commit->time);
+               n = draw_text(view, buf, view->width - col, FALSE, selected);
+               draw_text(view, " ", view->width - col - n, FALSE, selected);
+
+               col += DATE_COLS;
+               wmove(view->win, lineno, col);
+               if (col >= view->width)
+                       return TRUE;
+       }
        if (type != LINE_CURSOR)
                wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR));
 
-       if (opt_utf8) {
-               authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed);
-       } else {
-               authorlen = strlen(commit->author);
-               if (authorlen > AUTHOR_COLS - 2) {
-                       authorlen = AUTHOR_COLS - 2;
-                       trimmed = 1;
-               }
-       }
+       if (opt_author) {
+               int max_len;
 
-       if (trimmed) {
-               waddnstr(view->win, commit->author, authorlen);
-               if (type != LINE_CURSOR)
-                       wattrset(view->win, get_line_attr(LINE_MAIN_DELIM));
-               waddch(view->win, '~');
-       } else {
-               waddstr(view->win, commit->author);
+               max_len = view->width - col;
+               if (max_len > AUTHOR_COLS - 1)
+                       max_len = AUTHOR_COLS - 1;
+               draw_text(view, commit->author, max_len, TRUE, selected);
+               col += AUTHOR_COLS;
+               if (col >= view->width)
+                       return TRUE;
        }
 
-       col += AUTHOR_COLS;
-       if (type != LINE_CURSOR)
-               wattrset(view->win, A_NORMAL);
-
        if (opt_rev_graph && commit->graph_size) {
+               size_t graph_size = view->width - col;
                size_t i;
 
+               if (type != LINE_CURSOR)
+                       wattrset(view->win, get_line_attr(LINE_MAIN_REVGRAPH));
                wmove(view->win, lineno, col);
+               if (graph_size > commit->graph_size)
+                       graph_size = commit->graph_size;
                /* Using waddch() instead of waddnstr() ensures that
                 * they'll be rendered correctly for the cursor line. */
-               for (i = 0; i < commit->graph_size; i++)
+               for (i = 0; i < graph_size; i++)
                        waddch(view->win, commit->graph[i]);
 
-               waddch(view->win, ' ');
                col += commit->graph_size + 1;
+               if (col >= view->width)
+                       return TRUE;
+               waddch(view->win, ' ');
        }
+       if (type != LINE_CURSOR)
+               wattrset(view->win, A_NORMAL);
 
        wmove(view->win, lineno, col);
 
-       if (commit->refs) {
+       if (opt_show_refs && commit->refs) {
                size_t i = 0;
 
                do {
                        if (type == LINE_CURSOR)
                                ;
+                       else if (commit->refs[i]->head)
+                               wattrset(view->win, get_line_attr(LINE_MAIN_HEAD));
+                       else if (commit->refs[i]->ltag)
+                               wattrset(view->win, get_line_attr(LINE_MAIN_LOCAL_TAG));
                        else if (commit->refs[i]->tag)
                                wattrset(view->win, get_line_attr(LINE_MAIN_TAG));
                        else if (commit->refs[i]->remote)
                                wattrset(view->win, get_line_attr(LINE_MAIN_REMOTE));
                        else
                                wattrset(view->win, get_line_attr(LINE_MAIN_REF));
-                       waddstr(view->win, "[");
-                       waddstr(view->win, commit->refs[i]->name);
-                       waddstr(view->win, "]");
+
+                       col += draw_text(view, "[", view->width - col, TRUE, selected);
+                       col += draw_text(view, commit->refs[i]->name, view->width - col,
+                                        TRUE, selected);
+                       col += draw_text(view, "]", view->width - col, TRUE, selected);
                        if (type != LINE_CURSOR)
                                wattrset(view->win, A_NORMAL);
-                       waddstr(view->win, " ");
-                       col += strlen(commit->refs[i]->name) + STRING_SIZE("[] ");
+                       col += draw_text(view, " ", view->width - col, TRUE, selected);
+                       if (col >= view->width)
+                               return TRUE;
                } while (commit->refs[i++]->next);
        }
 
        if (type != LINE_CURSOR)
                wattrset(view->win, get_line_attr(type));
 
-       {
-               int titlelen = strlen(commit->title);
-
-               if (col + titlelen > view->width)
-                       titlelen = view->width - col;
-
-               waddnstr(view->win, commit->title, titlelen);
-       }
-
+       draw_text(view, commit->title, view->width - col, TRUE, selected);
        return TRUE;
 }
 
@@ -3015,8 +4858,7 @@ main_read(struct view *view, char *line)
 {
        static struct rev_graph *graph = graph_stacks;
        enum line_type type;
-       struct commit *commit = view->lines
-                             ? view->line[view->lines - 1].data : NULL;
+       struct commit *commit;
 
        if (!line) {
                update_rev_graph(graph);
@@ -3024,26 +4866,39 @@ main_read(struct view *view, char *line)
        }
 
        type = get_line_type(line);
-
-       switch (type) {
-       case LINE_COMMIT:
+       if (type == LINE_COMMIT) {
                commit = calloc(1, sizeof(struct commit));
                if (!commit)
                        return FALSE;
 
                line += STRING_SIZE("commit ");
+               if (*line == '-') {
+                       graph->boundary = 1;
+                       line++;
+               }
 
-               view->line[view->lines++].data = commit;
-               string_copy(commit->id, line);
+               string_copy_rev(commit->id, line);
                commit->refs = get_refs(commit->id);
                graph->commit = commit;
-               break;
+               add_line_data(view, commit, LINE_MAIN_COMMIT);
 
-       case LINE_PARENT:
-               if (commit) {
-                       line += STRING_SIZE("parent ");
+               while ((line = strchr(line, ' '))) {
+                       line++;
                        push_rev_graph(graph->parents, line);
+                       commit->has_parents = TRUE;
                }
+               return TRUE;
+       }
+
+       if (!view->lines)
+               return TRUE;
+       commit = view->line[view->lines - 1].data;
+
+       switch (type) {
+       case LINE_PARENT:
+               if (commit->has_parents)
+                       break;
+               push_rev_graph(graph->parents, line + STRING_SIZE("parent "));
                break;
 
        case LINE_AUTHOR:
@@ -3055,7 +4910,7 @@ main_read(struct view *view, char *line)
                char *nameend = strchr(ident, '<');
                char *emailend = strchr(ident, '>');
 
-               if (!commit || !nameend || !emailend)
+               if (!nameend || !emailend)
                        break;
 
                update_rev_graph(graph);
@@ -3069,7 +4924,7 @@ main_read(struct view *view, char *line)
                                ident = "Unknown";
                }
 
-               string_copy(commit->author, ident);
+               string_ncopy(commit->author, ident, strlen(ident));
 
                /* Parse epoch and timezone */
                if (emailend[1] == ' ') {
@@ -3097,9 +4952,6 @@ main_read(struct view *view, char *line)
                break;
        }
        default:
-               if (!commit)
-                       break;
-
                /* Fill in the commit title if it has not already been set. */
                if (commit->title[0])
                        break;
@@ -3118,19 +4970,23 @@ main_read(struct view *view, char *line)
                /* FIXME: More graceful handling of titles; append "..." to
                 * shortened titles, etc. */
 
-               string_copy(commit->title, line);
+               string_ncopy(commit->title, line, strlen(line));
        }
 
        return TRUE;
 }
 
-static bool
-main_enter(struct view *view, struct line *line)
+static enum request
+main_request(struct view *view, enum request request, struct line *line)
 {
        enum open_flags flags = display[0] == view ? OPEN_SPLIT : OPEN_DEFAULT;
 
-       open_view(view, REQ_VIEW_DIFF, flags);
-       return TRUE;
+       if (request == REQ_ENTER)
+               open_view(view, REQ_VIEW_DIFF, flags);
+       else
+               return request;
+
+       return REQ_NONE;
 }
 
 static bool
@@ -3169,15 +5025,16 @@ main_select(struct view *view, struct line *line)
 {
        struct commit *commit = line->data;
 
-       string_copy(view->ref, commit->id);
-       string_copy(ref_commit, view->ref);
+       string_copy_rev(view->ref, commit->id);
+       string_copy_rev(ref_commit, view->ref);
 }
 
 static struct view_ops main_ops = {
        "commit",
-       main_draw,
+       NULL,
        main_read,
-       main_enter,
+       main_draw,
+       main_request,
        main_grep,
        main_select,
 };
@@ -3213,6 +5070,9 @@ unicode_width(unsigned long c)
            || (c >= 0x30000 && c <= 0x3fffd)))
                return 2;
 
+       if (c == '\t')
+               return opt_tab_size;
+
        return 1;
 }
 
@@ -3280,19 +5140,16 @@ utf8_to_unicode(const char *string, size_t length)
 
 /* Calculates how much of string can be shown within the given maximum width
  * and sets trimmed parameter to non-zero value if all of string could not be
- * shown.
- *
- * Additionally, adds to coloffset how many many columns to move to align with
- * the expected position. Takes into account how multi-byte and double-width
- * characters will effect the cursor position.
+ * shown. If the reserve flag is TRUE, it will reserve at least one
+ * trailing character, which can be useful when drawing a delimiter.
  *
  * Returns the number of bytes to output from string to satisfy max_width. */
 static size_t
-utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
+utf8_length(const char *string, size_t max_width, int *trimmed, bool reserve)
 {
        const char *start = string;
        const char *end = strchr(string, '\0');
-       size_t mbwidth = 0;
+       unsigned char last_bytes = 0;
        size_t width = 0;
 
        *trimmed = 0;
@@ -3318,27 +5175,16 @@ utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed)
                width  += ucwidth;
                if (width > max_width) {
                        *trimmed = 1;
+                       if (reserve && width - ucwidth == max_width) {
+                               string -= last_bytes;
+                       }
                        break;
                }
 
-               /* The column offset collects the differences between the
-                * number of bytes encoding a character and the number of
-                * columns will be used for rendering said character.
-                *
-                * So if some character A is encoded in 2 bytes, but will be
-                * represented on the screen using only 1 byte this will and up
-                * adding 1 to the multi-byte column offset.
-                *
-                * Assumes that no double-width character can be encoding in
-                * less than two bytes. */
-               if (bytes > ucwidth)
-                       mbwidth += bytes - ucwidth;
-
                string  += bytes;
+               last_bytes = bytes;
        }
 
-       *coloffset += mbwidth;
-
        return string - start;
 }
 
@@ -3364,6 +5210,21 @@ report(const char *msg, ...)
        if (input_mode)
                return;
 
+       if (!view) {
+               char buf[SIZEOF_STR];
+               va_list args;
+
+               va_start(args, msg);
+               if (vsnprintf(buf, sizeof(buf), msg, args) >= sizeof(buf)) {
+                       buf[sizeof(buf) - 1] = 0;
+                       buf[sizeof(buf) - 2] = '.';
+                       buf[sizeof(buf) - 3] = '.';
+                       buf[sizeof(buf) - 4] = '.';
+               }
+               va_end(args);
+               die("%s", buf);
+       }
+
        if (!status_empty || *msg) {
                va_list args;
 
@@ -3506,18 +5367,21 @@ read_prompt(const char *prompt)
  * Repository references
  */
 
-static struct ref *refs;
-static size_t refs_size;
+static struct ref *refs = NULL;
+static size_t refs_alloc = 0;
+static size_t refs_size = 0;
 
 /* Id <-> ref store */
-static struct ref ***id_refs;
-static size_t id_refs_size;
+static struct ref ***id_refs = NULL;
+static size_t id_refs_alloc = 0;
+static size_t id_refs_size = 0;
 
 static struct ref **
 get_refs(char *id)
 {
        struct ref ***tmp_id_refs;
        struct ref **ref_list = NULL;
+       size_t ref_list_alloc = 0;
        size_t ref_list_size = 0;
        size_t i;
 
@@ -3525,7 +5389,8 @@ get_refs(char *id)
                if (!strcmp(id, id_refs[i][0]->id))
                        return id_refs[i];
 
-       tmp_id_refs = realloc(id_refs, (id_refs_size + 1) * sizeof(*id_refs));
+       tmp_id_refs = realloc_items(id_refs, &id_refs_alloc, id_refs_size + 1,
+                                   sizeof(*id_refs));
        if (!tmp_id_refs)
                return NULL;
 
@@ -3537,7 +5402,8 @@ get_refs(char *id)
                if (strcmp(id, refs[i].id))
                        continue;
 
-               tmp = realloc(ref_list, (ref_list_size + 1) * sizeof(*ref_list));
+               tmp = realloc_items(ref_list, &ref_list_alloc,
+                                   ref_list_size + 1, sizeof(*ref_list));
                if (!tmp) {
                        if (ref_list)
                                free(ref_list);
@@ -3563,19 +5429,24 @@ get_refs(char *id)
 }
 
 static int
-read_ref(char *id, int idlen, char *name, int namelen)
+read_ref(char *id, size_t idlen, char *name, size_t namelen)
 {
        struct ref *ref;
        bool tag = FALSE;
+       bool ltag = FALSE;
        bool remote = FALSE;
+       bool check_replace = FALSE;
+       bool head = FALSE;
 
        if (!strncmp(name, "refs/tags/", STRING_SIZE("refs/tags/"))) {
-               /* Commits referenced by tags has "^{}" appended. */
-               if (name[namelen - 1] != '}')
-                       return OK;
-
-               while (namelen > 0 && name[namelen] != '^')
-                       namelen--;
+               if (!strcmp(name + namelen - 3, "^{}")) {
+                       namelen -= 3;
+                       name[namelen] = 0;
+                       if (refs_size > 0 && refs[refs_size - 1].ltag == TRUE)
+                               check_replace = TRUE;
+               } else {
+                       ltag = TRUE;
+               }
 
                tag = TRUE;
                namelen -= STRING_SIZE("refs/tags/");
@@ -3589,12 +5460,24 @@ read_ref(char *id, int idlen, char *name, int namelen)
        } else if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
                namelen -= STRING_SIZE("refs/heads/");
                name    += STRING_SIZE("refs/heads/");
+               head     = !strncmp(opt_head, name, namelen);
 
        } else if (!strcmp(name, "HEAD")) {
+               opt_no_head = FALSE;
                return OK;
        }
 
-       refs = realloc(refs, sizeof(*refs) * (refs_size + 1));
+       if (check_replace && !strcmp(name, refs[refs_size - 1].name)) {
+               /* it's an annotated tag, replace the previous sha1 with the
+                * resolved commit id; relies on the fact git-ls-remote lists
+                * the commit id of an annotated tag right beofre the commit id
+                * it points to. */
+               refs[refs_size - 1].ltag = ltag;
+               string_copy_rev(refs[refs_size - 1].id, id);
+
+               return OK;
+       }
+       refs = realloc_items(refs, &refs_alloc, refs_size + 1, sizeof(*refs));
        if (!refs)
                return ERR;
 
@@ -3606,8 +5489,10 @@ read_ref(char *id, int idlen, char *name, int namelen)
        strncpy(ref->name, name, namelen);
        ref->name[namelen] = 0;
        ref->tag = tag;
+       ref->ltag = ltag;
        ref->remote = remote;
-       string_copy(ref->id, id);
+       ref->head = head;
+       string_copy_rev(ref->id, id);
 
        return OK;
 }
@@ -3622,10 +5507,13 @@ load_refs(void)
 }
 
 static int
-read_repo_config_option(char *name, int namelen, char *value, int valuelen)
+read_repo_config_option(char *name, size_t namelen, char *value, size_t valuelen)
 {
        if (!strcmp(name, "i18n.commitencoding"))
-               string_copy(opt_encoding, value);
+               string_ncopy(opt_encoding, value, valuelen);
+
+       if (!strcmp(name, "core.editor"))
+               string_ncopy(opt_editor, value, valuelen);
 
        return OK;
 }
@@ -3633,13 +5521,59 @@ read_repo_config_option(char *name, int namelen, char *value, int valuelen)
 static int
 load_repo_config(void)
 {
-       return read_properties(popen("git repo-config --list", "r"),
+       return read_properties(popen(GIT_CONFIG " --list", "r"),
                               "=", read_repo_config_option);
 }
 
 static int
+read_repo_info(char *name, size_t namelen, char *value, size_t valuelen)
+{
+       if (!opt_git_dir[0]) {
+               string_ncopy(opt_git_dir, name, namelen);
+
+       } else if (opt_is_inside_work_tree == -1) {
+               /* This can be 3 different values depending on the
+                * version of git being used. If git-rev-parse does not
+                * understand --is-inside-work-tree it will simply echo
+                * the option else either "true" or "false" is printed.
+                * Default to true for the unknown case. */
+               opt_is_inside_work_tree = strcmp(name, "false") ? TRUE : FALSE;
+
+       } else if (opt_cdup[0] == ' ') {
+               string_ncopy(opt_cdup, name, namelen);
+       } else {
+               if (!strncmp(name, "refs/heads/", STRING_SIZE("refs/heads/"))) {
+                       namelen -= STRING_SIZE("refs/heads/");
+                       name    += STRING_SIZE("refs/heads/");
+                       string_ncopy(opt_head, name, namelen);
+               }
+       }
+
+       return OK;
+}
+
+static int
+load_repo_info(void)
+{
+       int result;
+       FILE *pipe = popen("git rev-parse --git-dir --is-inside-work-tree "
+                          " --show-cdup --symbolic-full-name HEAD 2>/dev/null", "r");
+
+       /* XXX: The line outputted by "--show-cdup" can be empty so
+        * initialize it to something invalid to make it possible to
+        * detect whether it has been set or not. */
+       opt_cdup[0] = ' ';
+
+       result = read_properties(pipe, "=", read_repo_info);
+       if (opt_cdup[0] == ' ')
+               opt_cdup[0] = 0;
+
+       return result;
+}
+
+static int
 read_properties(FILE *pipe, const char *separators,
-               int (*read_property)(char *, int, char *, int))
+               int (*read_property)(char *, size_t, char *, size_t))
 {
        char buffer[BUFSIZ];
        char *name;
@@ -3707,6 +5641,18 @@ die(const char *err, ...)
        exit(1);
 }
 
+static void
+warn(const char *msg, ...)
+{
+       va_list args;
+
+       va_start(args, msg);
+       fputs("tig warning: ", stderr);
+       vfprintf(stderr, msg, args);
+       fputs("\n", stderr);
+       va_end(args);
+}
+
 int
 main(int argc, char *argv[])
 {
@@ -3717,20 +5663,32 @@ main(int argc, char *argv[])
        signal(SIGINT, quit);
 
        if (setlocale(LC_ALL, "")) {
-               string_copy(opt_codeset, nl_langinfo(CODESET));
+               char *codeset = nl_langinfo(CODESET);
+
+               string_ncopy(opt_codeset, codeset, strlen(codeset));
        }
 
+       if (load_repo_info() == ERR)
+               die("Failed to load repo info.");
+
        if (load_options() == ERR)
                die("Failed to load user config.");
 
        /* Load the repo config file so options can be overwritten from
-        * the command line.  */
+        * the command line. */
        if (load_repo_config() == ERR)
                die("Failed to load repo config.");
 
        if (!parse_options(argc, argv))
                return 0;
 
+       /* Require a git repository unless when running in pager mode. */
+       if (!opt_git_dir[0])
+               die("Not a git repository");
+
+       if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))
+               opt_utf8 = FALSE;
+
        if (*opt_codeset && strcmp(opt_codeset, opt_encoding)) {
                opt_iconv = iconv_open(opt_codeset, opt_encoding);
                if (opt_iconv == ICONV_NONE)
@@ -3740,10 +5698,6 @@ main(int argc, char *argv[])
        if (load_refs() == ERR)
                die("Failed to load refs.");
 
-       /* Require a git repository unless when running in pager mode. */
-       if (refs_size == 0 && opt_request != REQ_VIEW_PAGER)
-               die("Not a git repository");
-
        for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
                view->cmd_env = getenv(view->cmd_env);
 
@@ -3797,7 +5751,7 @@ main(int argc, char *argv[])
                        char *search = read_prompt(prompt);
 
                        if (search)
-                               string_copy(opt_search, search);
+                               string_ncopy(opt_search, search, strlen(search));
                        else
                                request = REQ_NONE;
                        break;