Add draw_lineno() and use when drawing the blame and pager view
[tig] / tig.c
diff --git a/tig.c b/tig.c
index b013410..ee9d706 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -103,6 +103,8 @@ static size_t utf8_length(const char *string, size_t max_width, int *trimmed, bo
 
 #define        SCALE_SPLIT_VIEW(height)        ((height) * 2 / 3)
 
+#define NULL_ID                "0000000000000000000000000000000000000000"
+
 #ifndef GIT_CONFIG
 #define GIT_CONFIG "git config"
 #endif
@@ -329,6 +331,7 @@ sq_quote(char buf[SIZEOF_STR], size_t bufsize, const char *src)
        REQ_(PREVIOUS,          "Move to previous"), \
        REQ_(VIEW_NEXT,         "Move focus to next view"), \
        REQ_(REFRESH,           "Reload and refresh"), \
+       REQ_(MAXIMIZE,          "Maximize the current view"), \
        REQ_(VIEW_CLOSE,        "Close the current view"), \
        REQ_(QUIT,              "Close all views and quit"), \
        \
@@ -444,6 +447,7 @@ 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;
@@ -463,6 +467,12 @@ parse_options(int argc, char *argv[])
        bool seen_dashdash = FALSE;
        int i;
 
+       if (!isatty(STDIN_FILENO)) {
+               opt_request = REQ_VIEW_PAGER;
+               opt_pipe = stdin;
+               return TRUE;
+       }
+
        if (argc <= 1)
                return TRUE;
 
@@ -521,7 +531,7 @@ parse_options(int argc, char *argv[])
                        return FALSE;
 
                } else if (!strcmp(opt, "-h") || !strcmp(opt, "--help")) {
-                       printf(usage);
+                       printf("%s\n", usage);
                        return FALSE;
                }
 
@@ -531,12 +541,6 @@ parse_options(int argc, char *argv[])
                        die("command too long");
        }
 
-       if (!isatty(STDIN_FILENO)) {
-               opt_request = REQ_VIEW_PAGER;
-               opt_pipe = stdin;
-               buf_size = 0;
-       }
-
        opt_cmd[buf_size] = 0;
 
        return TRUE;
@@ -727,6 +731,7 @@ static struct keybinding default_keybindings[] = {
        { KEY_UP,       REQ_PREVIOUS },
        { KEY_DOWN,     REQ_NEXT },
        { 'R',          REQ_REFRESH },
+       { 'M',          REQ_MAXIMIZE },
 
        /* Cursor navigation */
        { 'k',          REQ_MOVE_UP },
@@ -1354,6 +1359,7 @@ struct view {
        struct view_ops *ops;   /* View operations */
 
        enum keymap keymap;     /* What keymap does this view have */
+       bool git_dir;           /* Whether the view requires a git directory. */
 
        char cmd[SIZEOF_STR];   /* Command buffer */
        char ref[SIZEOF_REF];   /* Hovered commit reference */
@@ -1413,27 +1419,28 @@ 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}
+#define VIEW_STR(name, cmd, env, ref, ops, map, git) \
+       { name, cmd, #env, ref, ops, map, git }
 
-#define VIEW_(id, name, ops, ref) \
-       VIEW_STR(name, TIG_##id##_CMD,  TIG_##id##_CMD, ref, ops, KEYMAP_##id)
+#define VIEW_(id, name, ops, git, ref) \
+       VIEW_STR(name, TIG_##id##_CMD,  TIG_##id##_CMD, ref, ops, KEYMAP_##id, git)
 
 
 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_(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,  ""),
+       VIEW_(MAIN,   "main",   &main_ops,   TRUE,  ref_head),
+       VIEW_(DIFF,   "diff",   &pager_ops,  TRUE,  ref_commit),
+       VIEW_(LOG,    "log",    &pager_ops,  TRUE,  ref_head),
+       VIEW_(TREE,   "tree",   &tree_ops,   TRUE,  ref_commit),
+       VIEW_(BLOB,   "blob",   &blob_ops,   TRUE,  ref_blob),
+       VIEW_(BLAME,  "blame",  &blame_ops,  TRUE,  ref_commit),
+       VIEW_(HELP,   "help",   &help_ops,   FALSE, ""),
+       VIEW_(PAGER,  "pager",  &pager_ops,  FALSE, "stdin"),
+       VIEW_(STATUS, "status", &status_ops, TRUE,  ""),
+       VIEW_(STAGE,  "stage",  &stage_ops,  TRUE,  ""),
 };
 
-#define VIEW(req) (&views[(req) - REQ_OFFSET - 1])
+#define VIEW(req)      (&views[(req) - REQ_OFFSET - 1])
+#define VIEW_REQ(view) ((view) - views + REQ_OFFSET + 1)
 
 #define foreach_view(view, i) \
        for (i = 0; i < ARRAY_SIZE(views) && (view = &views[i]); i++)
@@ -1475,6 +1482,43 @@ draw_text(struct view *view, const char *string, int max_len,
        return len;
 }
 
+static int
+draw_lineno(struct view *view, unsigned int lineno, int max, bool selected)
+{
+       static char fmt[] = "%1ld";
+       char number[10] = "          ";
+       int max_number = MIN(view->digits, STRING_SIZE(number));
+       bool showtrimmed = FALSE;
+       int col;
+
+       lineno += view->offset + 1;
+       if (lineno == 1 || (lineno % opt_num_interval) == 0) {
+               if (view->digits <= 9)
+                       fmt[1] = '0' + view->digits;
+
+               if (!string_format(number, fmt, lineno))
+                       number[0] = 0;
+               showtrimmed = TRUE;
+       }
+
+       if (max < max_number)
+               max_number = max;
+
+       col = draw_text(view, number, max_number, showtrimmed, selected);
+       if (col < max) {
+               if (!selected)
+                       wattrset(view->win, A_NORMAL);
+               waddch(view->win, ACS_VLINE);
+               col++;
+       }
+       if (col < max) {
+               waddch(view->win, ' ');
+               col++;
+       }
+
+       return col;
+}
+
 static bool
 draw_view_line(struct view *view, unsigned int lineno)
 {
@@ -2275,15 +2319,8 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
                return;
        }
 
-       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);
+       if (view->git_dir && !opt_git_dir[0]) {
+               report("The %s view is disabled in pager view", view->name);
                return;
        }
 
@@ -2304,6 +2341,18 @@ open_view(struct view *prev, enum request request, enum open_flags flags)
            (nviews == 1 && base_view != display[0]))
                resize_display();
 
+       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);
+               return;
+       }
+
        if (split && prev->lineno - prev->offset >= prev->height) {
                /* Take the title line into account. */
                int lines = prev->lineno - prev->offset - prev->height + 1;
@@ -2578,6 +2627,11 @@ view_driver(struct view *view, enum request request)
                report("Refreshing is not yet supported for the %s view", view->name);
                break;
 
+       case REQ_MAXIMIZE:
+               if (displayed_views() == 2)
+                       open_view(view, VIEW_REQ(view), OPEN_DEFAULT);
+               break;
+
        case REQ_TOGGLE_LINENO:
                opt_line_number = !opt_line_number;
                redraw_display();
@@ -2683,39 +2737,35 @@ view_driver(struct view *view, enum request request)
 static bool
 pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selected)
 {
+       static char spaces[] = "                    ";
        char *text = line->data;
        enum line_type type = line->type;
-       int attr;
+       int attr = A_NORMAL;
+       int col = 0;
 
        wmove(view->win, lineno, 0);
 
        if (selected) {
                type = LINE_CURSOR;
                wchgat(view->win, -1, 0, type, NULL);
+               attr = get_line_attr(type);
        }
-
-       attr = get_line_attr(type);
        wattrset(view->win, attr);
 
-       if (opt_line_number || opt_tab_size < TABSIZE) {
-               static char spaces[] = "                    ";
-               int col_offset = 0, col = 0;
-
-               if (opt_line_number) {
-                       unsigned long real_lineno = view->offset + lineno + 1;
-
-                       if (real_lineno == 1 ||
-                           (real_lineno % opt_num_interval) == 0) {
-                               wprintw(view->win, "%.*d", view->digits, real_lineno);
+       if (opt_line_number) {
+               col += draw_lineno(view, lineno, view->width, selected);
+               if (col >= view->width)
+                       return TRUE;
+       }
 
-                       } else {
-                               waddnstr(view->win, spaces,
-                                        MIN(view->digits, STRING_SIZE(spaces)));
-                       }
-                       waddstr(view->win, ": ");
-                       col_offset = view->digits + 2;
-               }
+       if (!selected) {
+               attr = get_line_attr(type);
+               wattrset(view->win, attr);
+       }
+       if (opt_tab_size < TABSIZE) {
+               int col_offset = col;
 
+               col = 0;
                while (text && col_offset + col < view->width) {
                        int cols_max = view->width - col_offset - col;
                        char *pos = text;
@@ -2737,7 +2787,7 @@ pager_draw(struct view *view, struct line *line, unsigned int lineno, bool selec
                }
 
        } else {
-               draw_text(view, text, view->width, TRUE, selected);
+               draw_text(view, text, view->width - col, TRUE, selected);
        }
 
        return TRUE;
@@ -3411,9 +3461,9 @@ parse_blame_commit(struct view *view, char *text, int *blamed)
 
                blame = line->data;
                blame->commit = commit;
+               blame->header = !group;
                line->dirty = 1;
        }
-       blame->header = 1;
 
        return commit;
 }
@@ -3582,43 +3632,13 @@ blame_draw(struct view *view, struct line *line, unsigned int lineno, bool selec
        }
 
        {
-               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);
+               col += draw_lineno(view, lineno, view->width - col, 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;
@@ -3637,7 +3657,7 @@ blame_request(struct view *view, enum request request, struct line *line)
                        break;
                }
 
-               if (!strcmp(blame->commit->id, "0000000000000000000000000000000000000000")) {
+               if (!strcmp(blame->commit->id, NULL_ID)) {
                        char path[SIZEOF_STR];
 
                        if (sq_quote(path, 0, view->vid) >= sizeof(path))
@@ -3692,7 +3712,7 @@ blame_select(struct view *view, struct line *line)
        if (!commit)
                return;
 
-       if (!strcmp(commit->id, "0000000000000000000000000000000000000000"))
+       if (!strcmp(commit->id, NULL_ID))
                string_ncopy(ref_commit, "HEAD", 4);
        else
                string_copy_rev(ref_commit, commit->id);
@@ -3764,7 +3784,7 @@ status_get_diff(struct status *file, char *buf, size_t bufsize)
 }
 
 static bool
-status_run(struct view *view, const char cmd[], bool diff, enum line_type type)
+status_run(struct view *view, const char cmd[], char status, enum line_type type)
 {
        struct status *file = NULL;
        struct status *unmerged = NULL;
@@ -3803,8 +3823,10 @@ status_run(struct view *view, const char cmd[], bool diff, enum line_type type)
                        }
 
                        /* Parse diff info part. */
-                       if (!diff) {
-                               file->status = '?';
+                       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))
@@ -3880,6 +3902,8 @@ error_out:
 #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"
@@ -3887,6 +3911,9 @@ error_out:
 #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). */
@@ -3895,8 +3922,10 @@ status_open(struct view *view)
 {
        struct stat statbuf;
        char exclude[SIZEOF_STR];
-       char cmd[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++)
@@ -3909,29 +3938,40 @@ status_open(struct view *view)
                return FALSE;
 
        add_line_data(view, NULL, LINE_STAT_HEAD);
-       if (!*opt_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;
 
-       string_copy(cmd, STATUS_LIST_OTHER_CMD);
-
        if (stat(exclude, &statbuf) >= 0) {
-               size_t cmdsize = strlen(cmd);
+               size_t cmdsize = strlen(othercmd);
+
+               if (!string_format_from(othercmd, &cmdsize, " %s", "--exclude-from=") ||
+                   sq_quote(othercmd, cmdsize, exclude) >= sizeof(othercmd))
+                       return FALSE;
 
-               if (!string_format_from(cmd, &cmdsize, " %s", "--exclude-from=") ||
-                   sq_quote(cmd, cmdsize, exclude) >= sizeof(cmd))
+               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, STATUS_DIFF_INDEX_CMD, TRUE, LINE_STAT_STAGED) ||
-           !status_run(view, STATUS_DIFF_FILES_CMD, TRUE, LINE_STAT_UNSTAGED) ||
-           !status_run(view, cmd, FALSE, LINE_STAT_UNTRACKED))
+       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
@@ -3941,6 +3981,8 @@ status_open(struct view *view)
                prev_lineno = view->lines - 1;
        while (prev_lineno < view->lines && !view->line[prev_lineno].data)
                prev_lineno++;
+       while (prev_lineno > 0 && !view->line[prev_lineno].data)
+               prev_lineno--;
 
        /* If the above fails, always skip the "On branch" line. */
        if (prev_lineno < view->lines)
@@ -3948,6 +3990,11 @@ status_open(struct view *view)
        else
                view->lineno = 1;
 
+       if (view->lineno < view->offset)
+               view->offset = view->lineno;
+       else if (view->offset + view->height <= view->lineno)
+               view->offset = view->lineno - view->height + 1;
+
        return TRUE;
 }
 
@@ -4049,9 +4096,18 @@ status_enter(struct view *view, struct line *line)
 
        switch (line->type) {
        case LINE_STAT_STAGED:
-               if (!string_format_from(opt_cmd, &cmdsize,
-                                       STATUS_DIFF_INDEX_SHOW_CMD, oldpath, newpath))
-                       return REQ_QUIT;
+               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
@@ -4072,7 +4128,6 @@ status_enter(struct view *view, struct line *line)
                if (opt_pipe)
                        return REQ_QUIT;
 
-
                if (!status) {
                        report("No file to show");
                        return REQ_NONE;
@@ -4105,64 +4160,113 @@ status_enter(struct view *view, struct line *line)
 }
 
 
-static bool
-status_update_file(struct view *view, struct status *status, enum line_type type)
+static FILE *
+status_update_prepare(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;
+               return NULL;
+
+       switch (type) {
+       case LINE_STAT_STAGED:
+               string_add(cmd, cmdsize, "git update-index -z --index-info");
+               break;
+
+       case LINE_STAT_UNSTAGED:
+       case LINE_STAT_UNTRACKED:
+               string_add(cmd, cmdsize, "git update-index -z --add --remove --stdin");
+               break;
+
+       default:
+               die("line type %d not handled in switch", type);
+       }
+
+       return popen(cmd, "w");
+}
+
+static bool
+status_update_write(FILE *pipe, struct status *status, enum line_type type)
+{
+       char buf[SIZEOF_STR];
+       size_t bufsize = 0;
+       size_t written = 0;
 
        switch (type) {
        case LINE_STAT_STAGED:
                if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
-                                       status->old.mode,
+                                       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);
        }
 
+       return written == bufsize;
+}
+
+static bool
+status_update_file(struct status *status, enum line_type type)
+{
+       FILE *pipe = status_update_prepare(type);
+       bool result;
+
+       if (!pipe)
+               return FALSE;
+
+       result = status_update_write(pipe, status, type);
        pclose(pipe);
+       return result;
+}
 
-       if (written != bufsize)
+static bool
+status_update_files(struct view *view, struct line *line)
+{
+       FILE *pipe = status_update_prepare(line->type);
+       bool result = TRUE;
+       struct line *pos = view->line + view->lines;
+       int files = 0;
+       int file, done;
+
+       if (!pipe)
                return FALSE;
 
-       return TRUE;
+       for (pos = line; pos < view->line + view->lines && pos->data; pos++)
+               files++;
+
+       for (file = 0, done = 0; result && file < files; line++, file++) {
+               int almost_done = file * 100 / files;
+
+               if (almost_done > done) {
+                       done = almost_done;
+                       string_format(view->ref, "updating file %u of %u (%d%% done)",
+                                     file, files, done);
+                       update_view_title(view);
+               }
+               result = status_update_write(pipe, line->data, line->type);
+       }
+
+       pclose(pipe);
+       return result;
 }
 
-static void
+static bool
 status_update(struct view *view)
 {
        struct line *line = &view->line[view->lineno];
@@ -4170,19 +4274,20 @@ status_update(struct view *view)
        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) {
+               /* This should work even for the "On branch" line. */
+               if (line < view->line + view->lines && !line[1].data) {
                        report("Nothing to update");
-                       return;
+                       return FALSE;
                }
 
-       } else if (!status_update_file(view, line->data, line->type)) {
+               if (!status_update_files(view, line + 1))
+                       report("Failed to update file status");
+
+       } else if (!status_update_file(line->data, line->type)) {
                report("Failed to update file status");
        }
+
+       return TRUE;
 }
 
 static enum request
@@ -4192,7 +4297,8 @@ status_request(struct view *view, enum request request, struct line *line)
 
        switch (request) {
        case REQ_STATUS_UPDATE:
-               status_update(view);
+               if (!status_update(view))
+                       return REQ_NONE;
                break;
 
        case REQ_STATUS_MERGE:
@@ -4381,7 +4487,7 @@ stage_update_chunk(struct view *view, struct line *line)
                return FALSE;
 
        if (!string_format_from(cmd, &cmdsize,
-                               "git apply --cached %s - && "
+                               "git apply --whitespace=nowarn --cached %s - && "
                                "git update-index -q --unmerged --refresh 2>/dev/null",
                                stage_line_type == LINE_STAT_STAGED ? "-R" : ""))
                return FALSE;
@@ -4436,14 +4542,14 @@ stage_update_chunk(struct view *view, struct line *line)
 static void
 stage_update(struct view *view, struct line *line)
 {
-       if (stage_line_type != LINE_STAT_UNTRACKED &&
+       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 (!status_update_file(view, &stage_status, stage_line_type)) {
+       } else if (!status_update_file(&stage_status, stage_line_type)) {
                report("Failed to update file");
                return;
        }
@@ -5432,6 +5538,7 @@ read_ref(char *id, size_t idlen, char *name, size_t namelen)
                head     = !strncmp(opt_head, name, namelen);
 
        } else if (!strcmp(name, "HEAD")) {
+               opt_no_head = FALSE;
                return OK;
        }
 
@@ -5651,7 +5758,7 @@ main(int argc, char *argv[])
                return 0;
 
        /* Require a git repository unless when running in pager mode. */
-       if (!opt_git_dir[0])
+       if (!opt_git_dir[0] && opt_request != REQ_VIEW_PAGER)
                die("Not a git repository");
 
        if (*opt_encoding && strcasecmp(opt_encoding, "UTF-8"))