X-Git-Url: https://git.distorted.org.uk/~mdw/tig/blobdiff_plain/468876c9ed00a4d31ce2dca57e7c66dbfbd9c5f3..4f774851c65e0660b48ba639b47262e6283fe497:/tig.c diff --git a/tig.c b/tig.c index 3b51c5a..efea6f4 100644 --- a/tig.c +++ b/tig.c @@ -23,7 +23,7 @@ * Browse changes in a git repository. Additionally, tig(1) can also act * as a pager for output of various git commands. * - * When browsing repositories, tig(1) uses the underlaying git commands + * When browsing repositories, tig(1) uses the underlying git commands * to present the user with various views, such as summarized commit log * and showing the commit with the log message, diffstat, and the diff. * @@ -32,7 +32,7 @@ **/ #ifndef VERSION -#define VERSION "tig-0.1" +#define VERSION "tig-0.3" #endif #ifndef DEBUG @@ -55,6 +55,7 @@ static void die(const char *err, ...); static void report(const char *msg, ...); static void set_nonblocking_input(bool loading); +static size_t utf8_length(const char *string, size_t max_width, int *coloffset, int *trimmed); #define ABS(x) ((x) >= 0 ? (x) : -(x)) #define MIN(x, y) ((x) < (y) ? (x) : (y)) @@ -68,12 +69,14 @@ static void set_nonblocking_input(bool loading); /* This color name can be used to refer to the default term colors. */ #define COLOR_DEFAULT (-1) -#define TIG_HELP "(d)iff, (l)og, (m)ain, (q)uit, (h)elp, (Enter) show diff" +#define TIG_HELP "(d)iff, (l)og, (m)ain, (q)uit, (h)elp" /* 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 + /* The default interval between line numbers. */ #define NUMBER_INTERVAL 1 @@ -109,6 +112,7 @@ enum request { REQ_STOP_LOADING, REQ_TOGGLE_LINE_NUMBERS, REQ_VIEW_NEXT, + REQ_VIEW_CLOSE, REQ_MOVE_UP, REQ_MOVE_UP_ENTER, @@ -146,7 +150,7 @@ struct commit { */ static inline void -string_ncopy(char *dst, char *src, int dstlen) +string_ncopy(char *dst, const char *src, int dstlen) { strncpy(dst, src, dstlen - 1); dst[dstlen - 1] = 0; @@ -180,7 +184,7 @@ sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src) { char c; -#define BUFPUT(x) ( (bufsize < SIZEOF_CMD) && (buf[bufsize++] = (x)) ) +#define BUFPUT(x) do { if (bufsize < SIZEOF_CMD) buf[bufsize++] = (x); } while (0) BUFPUT('\''); while ((c = *src++)) { @@ -204,6 +208,25 @@ sq_quote(char buf[SIZEOF_CMD], size_t bufsize, const char *src) * ------- **/ +static const char usage[] = +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" +"\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" +" -t[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"; + /* Option and state variables. */ static bool opt_line_number = FALSE; static int opt_num_interval = NUMBER_INTERVAL; @@ -293,9 +316,19 @@ parse_options(int argc, char *argv[]) } /** + * -h, --help:: + * Show help message and exit. + **/ + if (!strcmp(opt, "-h") || + !strcmp(opt, "--help")) { + printf(usage); + return FALSE; + } + + /** * \--:: - * End of tig(1) options. Useful when specifying commands - * for the main view. Example: + * End of tig(1) options. Useful when specifying command + * options for the main view. Example: * * $ tig -- --since=1.month **/ @@ -305,13 +338,13 @@ parse_options(int argc, char *argv[]) } /** - * log [options]:: + * log [git log options]:: * Open log view using the given git log options. * - * diff [options]:: + * diff [git diff options]:: * Open diff view using the given git diff options. * - * show [options]:: + * show [git show options]:: * Open diff view using the given git show options. **/ if (!strcmp(opt, "log") || @@ -322,11 +355,16 @@ parse_options(int argc, char *argv[]) break; } - /* Make stuff like: + /** + * [git log options]:: + * tig(1) will stop the option parsing when the first + * command line parameter not starting with "-" is + * encountered. All options including this one will be + * passed to git log when loading the main view. + * This makes it possible to say: * * $ tig tag-1.0..HEAD - * - * work. */ + **/ if (opt[0] && opt[0] != '-') break; @@ -367,10 +405,10 @@ parse_options(int argc, char *argv[]) * * $ tig log --pretty=fuller * - * See the "Specifying revisions" section below for an introduction - * to revision options supported by the git commands. For - * details on specific git command options, refer to the man - * page of the command in question. + * See the <> section below + * for an introduction to revision options supported by the git + * commands. For details on specific git command options, refer + * to the man page of the command in question. **/ if (opt_request == REQ_VIEW_MAIN) @@ -453,7 +491,7 @@ enum line_type { }; struct line_info { - char *line; /* The start of line to match. */ + const char *line; /* The start of line to match. */ int linelen; /* Size of string to match. */ int fg, bg, attr; /* Color and text attributes for the lines. */ }; @@ -537,9 +575,10 @@ init_colors(void) **/ #define TIG_LS_REMOTE \ - "git ls-remote ." + "git ls-remote . 2>/dev/null" /** + * [[view-commands]] * View commands * ~~~~~~~~~~~~~ * It is possible to alter which commands are used for the different views. @@ -577,56 +616,69 @@ init_colors(void) #define TIG_MAIN_CMD \ "git log --topo-order --stat --pretty=raw %s" -/* We silently ignore that the following are also exported. */ +/* ... silently ignore that the following are also exported. */ #define TIG_HELP_CMD \ - "man tig 2> /dev/null" + "man tig 2>/dev/null" #define TIG_PAGER_CMD \ "" + /** * The viewer * ---------- + * The display consists of a status window on the last line of the screen and + * one or more views. The default is to only show one view at the time but it + * is possible to split both the main and log view to also show the commit + * diff. * - * tig(1) presents various 'views' of a repository. Each view is based on output - * from an external command, most often 'git log', 'git diff', or 'git show'. + * If you are in the log view and press 'Enter' when the current line is a + * commit line, such as: * - * The main view:: - * Is the default view, and it shows a one line summary of each commit - * in the chosen list of revision. The summary includes commit date, - * author, and the first line of the log message. Additionally, any - * repository references, such as tags, will be shown. - * - * The log view:: - * Presents a more rich view of the revision log showing the whole log - * message and the diffstat. - * - * The diff view:: - * Shows either the diff of the current working tree, that is, what - * has changed since the last commit, or the commit diff complete - * with log message, diffstat and diff. + * commit 4d55caff4cc89335192f3e566004b4ceef572521 * - * The pager view:: - * Is used for displaying both input from stdin and output from git - * commands entered in the internal prompt. + * You will split the view so that the log view is displayed in the top window + * and the diff view in the bottom window. You can switch between the two + * views by pressing 'Tab'. To maximize the log view again, simply press 'l'. + **/ + +struct view; + +/* The display array of active views and the index of the current view. */ +static struct view *display[2]; +static unsigned int current_view; + +#define foreach_view(view, i) \ + for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++) + + +/** + * Current head and commit ID + * ~~~~~~~~~~~~~~~~~~~~~~~~~~ + * The viewer keeps track of both what head and commit ID you are currently + * viewing. The commit ID will follow the cursor line and change everytime time + * you highlight a different commit. Whenever you reopen the diff view it + * will be reloaded, if the commit ID changed. * - * The help view:: - * Displays the information from the tig(1) man page. For the help view - * to work you need to have the tig(1) man page installed. + * The head ID is used when opening the main and log view to indicate from + * what revision to show history. **/ +static char ref_commit[SIZEOF_REF] = "HEAD"; +static char ref_head[SIZEOF_REF] = "HEAD"; + + struct view { const char *name; /* View name */ - char *cmd_fmt; /* Default command line format */ - char *cmd_env; /* Command line set via environment */ - char *id; /* Points to either of ref_{head,commit} */ - size_t objsize; /* Size of objects in the line index */ + const char *cmd_fmt; /* Default command line format */ + const char *cmd_env; /* Command line set via environment */ + const char *id; /* Points to either of ref_{head,commit} */ struct view_ops { /* What type of content being displayed. Used in the * title bar. */ - char *type; + const char *type; /* Draw one line; @lineno must be < view->height. */ bool (*draw)(struct view *view, unsigned int lineno); /* Read one line; updates view->line. */ @@ -647,6 +699,10 @@ struct view { unsigned long offset; /* Offset of the window top */ unsigned long lineno; /* Current line number */ + /* If non-NULL, points to the view that opened this view. If this view + * is closed tig will switch back to the parent view. */ + struct view *parent; + /* Buffering */ unsigned long lines; /* Total number of lines */ void **line; /* Line index; each line contains user data */ @@ -660,32 +716,52 @@ struct view { static struct view_ops pager_ops; static struct view_ops main_ops; -char ref_head[SIZEOF_REF] = "HEAD"; -char ref_commit[SIZEOF_REF] = "HEAD"; +#define VIEW_STR(name, cmd, env, ref, ops) \ + { name, cmd, #env, ref, ops } -#define VIEW_STR(name, cmd, env, ref, objsize, ops) \ - { name, cmd, #env, ref, objsize, ops } +#define VIEW_(id, name, ops, ref) \ + VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, ops) -#define VIEW_(id, name, ops, ref, objsize) \ - VIEW_STR(name, TIG_##id##_CMD, TIG_##id##_CMD, ref, objsize, ops) +/** + * Views + * ~~~~~ + * tig(1) presents various 'views' of a repository. Each view is based on output + * from an external command, most often 'git log', 'git diff', or 'git show'. + * + * The main view:: + * Is the default view, and it shows a one line summary of each commit + * in the chosen list of revisions. The summary includes commit date, + * author, and the first line of the log message. Additionally, any + * repository references, such as tags, will be shown. + * + * The log view:: + * Presents a more rich view of the revision log showing the whole log + * message and the diffstat. + * + * The diff view:: + * Shows either the diff of the current working tree, that is, what + * has changed since the last commit, or the commit diff complete + * with log message, diffstat and diff. + * + * The pager view:: + * Is used for displaying both input from stdin and output from git + * commands entered in the internal prompt. + * + * The help view:: + * Displays the information from the tig(1) man page. For the help view + * to work you need to have the tig(1) man page installed. + **/ static struct view views[] = { - VIEW_(MAIN, "main", &main_ops, ref_head, sizeof(struct commit)), - VIEW_(DIFF, "diff", &pager_ops, ref_commit, sizeof(char)), - VIEW_(LOG, "log", &pager_ops, ref_head, sizeof(char)), - VIEW_(HELP, "help", &pager_ops, ref_head, sizeof(char)), - VIEW_(PAGER, "pager", &pager_ops, "static", sizeof(char)), + VIEW_(MAIN, "main", &main_ops, ref_head), + VIEW_(DIFF, "diff", &pager_ops, ref_commit), + VIEW_(LOG, "log", &pager_ops, ref_head), + VIEW_(HELP, "help", &pager_ops, "static"), + VIEW_(PAGER, "pager", &pager_ops, "static"), }; #define VIEW(req) (&views[(req) - REQ_OFFSET - 1]) -/* The display array of active views and the index of the current view. */ -static struct view *display[2]; -static unsigned int current_view; - -#define foreach_view(view, i) \ - for (i = 0; i < ARRAY_SIZE(display) && (view = display[i]); i++) - static void redraw_view_from(struct view *view, int lineno) @@ -708,6 +784,45 @@ redraw_view(struct view *view) redraw_view_from(view, 0); } + +/** + * Title windows + * ~~~~~~~~~~~~~ + * Each view has a title window which shows the name of the view, current + * commit ID if available, and where the view is positioned: + * + * [main] c622eefaa485995320bc743431bae0d497b1d875 - commit 1 of 61 (1%) + * + * By default, the title of the current view is highlighted using bold font. + **/ + +static void +update_view_title(struct view *view) +{ + if (view == display[current_view]) + wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS)); + else + wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR)); + + werase(view->title); + wmove(view->title, 0, 0); + + if (*view->ref) + wprintw(view->title, "[%s] %s", view->name, view->ref); + else + wprintw(view->title, "[%s]", view->name); + + if (view->lines) { + wprintw(view->title, " - %s %d of %d (%d%%)", + view->ops->type, + view->lineno + 1, + view->lines, + (view->lineno + 1) * 100 / view->lines); + } + + wrefresh(view->title); +} + static void resize_display(void) { @@ -738,9 +853,9 @@ resize_display(void) offset = 0; foreach_view (view, i) { - /* Keep the size of the all view windows one lager than is - * required. This makes current line management easier when the - * cursor will go outside the window. */ + /* Keep the height of all view->win windows one larger than is + * required so that the cursor can wrap-around on the last line + * without scrolling the window. */ if (!view->win) { view->win = newwin(view->height + 1, 0, offset, 0); if (!view->win) @@ -764,34 +879,18 @@ resize_display(void) } static void -update_view_title(struct view *view) +redraw_display(void) { - if (view == display[current_view]) - wbkgdset(view->title, get_line_attr(LINE_TITLE_FOCUS)); - else - wbkgdset(view->title, get_line_attr(LINE_TITLE_BLUR)); - - werase(view->title); - wmove(view->title, 0, 0); - - /* [main] ref: 334b506... - commit 6 of 4383 (0%) */ - - if (*view->ref) - wprintw(view->title, "[%s] %s", view->name, view->ref); - else - wprintw(view->title, "[%s]", view->name); + struct view *view; + int i; - if (view->lines) { - wprintw(view->title, " - %s %d of %d (%d%%)", - view->ops->type, - view->lineno + 1, - view->lines, - (view->lineno + 1) * 100 / view->lines); + foreach_view (view, i) { + redraw_view(view); + update_view_title(view); } - - wrefresh(view->title); } + /* * Navigation */ @@ -981,7 +1080,7 @@ move_view(struct view *view, enum request request) static bool begin_update(struct view *view) { - char *id = view->id; + const char *id = view->id; if (opt_cmd[0]) { string_copy(view->cmd, opt_cmd); @@ -990,7 +1089,7 @@ begin_update(struct view *view) * invalid so clear it. */ view->ref[0] = 0; } else { - char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt; + const char *format = view->cmd_env ? view->cmd_env : view->cmd_fmt; if (snprintf(view->cmd, sizeof(view->cmd), format, id, id, id, id, id) >= sizeof(view->cmd)) @@ -1119,7 +1218,7 @@ update_view(struct view *view) time_t secs = time(NULL) - view->start_time; if (view == VIEW(REQ_VIEW_HELP)) { - char *msg = TIG_HELP; + const char *msg = TIG_HELP; if (view->lines == 0) { /* Slightly ugly, but abusing view->ref keeps @@ -1161,21 +1260,7 @@ open_view(struct view *prev, enum request request, enum open_flags flags) bool split = !!(flags & OPEN_SPLIT); bool reload = !!(flags & OPEN_RELOAD); struct view *view = VIEW(request); - struct view *displayed; - int nviews; - - /* Cycle between displayed views and count the views. */ - foreach_view (displayed, nviews) { - if (prev != view && - view == displayed && - !strcmp(view->vid, prev->vid)) { - current_view = nviews; - /* Blur out the title of the previous view. */ - update_view_title(prev); - report(""); - return; - } - } + int nviews = display[1] ? 2 : 1; if (view == prev && nviews == 1 && !reload) { report("Already in %s view", view->name); @@ -1218,6 +1303,7 @@ open_view(struct view *prev, enum request request, enum open_flags flags) /* Continue loading split views in the background. */ if (!split) end_update(prev); + view->parent = prev; } if (view->pipe) { @@ -1304,8 +1390,7 @@ view_driver(struct view *view, enum request request) } case REQ_TOGGLE_LINE_NUMBERS: opt_line_number = !opt_line_number; - redraw_view(view); - update_view_title(view); + redraw_display(); break; case REQ_PROMPT: @@ -1322,23 +1407,31 @@ view_driver(struct view *view, enum request request) break; case REQ_SHOW_VERSION: - report("Version: %s", VERSION); + report("%s (built %s)", VERSION, __DATE__); return TRUE; case REQ_SCREEN_RESIZE: resize_display(); /* Fall-through */ case REQ_SCREEN_REDRAW: - foreach_view (view, i) { - redraw_view(view); - update_view_title(view); - } + redraw_display(); break; case REQ_SCREEN_UPDATE: doupdate(); return TRUE; + case REQ_VIEW_CLOSE: + if (view->parent) { + memset(display, 0, sizeof(display)); + current_view = 0; + display[current_view] = view->parent; + view->parent = NULL; + resize_display(); + redraw_display(); + break; + } + /* Fall-through */ case REQ_QUIT: return FALSE; @@ -1461,14 +1554,26 @@ static bool pager_enter(struct view *view) { char *line = view->line[view->lineno]; + int split = 0; - if (get_line_type(line) == LINE_COMMIT) { - if (view == VIEW(REQ_VIEW_LOG)) - open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT | OPEN_BACKGROUNDED); - else - open_view(view, REQ_VIEW_DIFF, OPEN_DEFAULT); + if ((view == VIEW(REQ_VIEW_LOG) || + view == VIEW(REQ_VIEW_LOG)) && + get_line_type(line) == LINE_COMMIT) { + open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT); + split = 1; } + /* Always scroll the view even if it was split. That way + * you can use Enter to scroll through the log view and + * split open each commit diff. */ + scroll_view(view, REQ_SCROLL_LINE_DOWN); + + /* FIXME: A minor workaround. Scrolling the view will call report("") + * but if we are scolling a non-current view this won't properly update + * the view title. */ + if (split) + update_view_title(view); + return TRUE; } @@ -1490,6 +1595,8 @@ main_draw(struct view *view, unsigned int lineno) enum line_type type; int col = 0; size_t timelen; + size_t authorlen; + int trimmed; if (view->offset + lineno >= view->lines) return FALSE; @@ -1521,8 +1628,11 @@ main_draw(struct view *view, unsigned int lineno) if (type != LINE_CURSOR) wattrset(view->win, get_line_attr(LINE_MAIN_AUTHOR)); - if (strlen(commit->author) > 19) { - waddnstr(view->win, commit->author, 18); + /* FIXME: Make this optional, and add i18n.commitEncoding support. */ + authorlen = utf8_length(commit->author, AUTHOR_COLS - 2, &col, &trimmed); + + if (trimmed) { + waddnstr(view->win, commit->author, authorlen); if (type != LINE_CURSOR) wattrset(view->win, get_line_attr(LINE_MAIN_DELIM)); waddch(view->win, '~'); @@ -1530,7 +1640,7 @@ main_draw(struct view *view, unsigned int lineno) waddstr(view->win, commit->author); } - col += 20; + col += AUTHOR_COLS; if (type != LINE_CURSOR) wattrset(view->win, A_NORMAL); @@ -1664,7 +1774,7 @@ main_read(struct view *view, char *line) static bool main_enter(struct view *view) { - open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT | OPEN_BACKGROUNDED); + open_view(view, REQ_VIEW_DIFF, OPEN_SPLIT); return TRUE; } @@ -1687,7 +1797,7 @@ struct keymap { int request; }; -struct keymap keymap[] = { +static struct keymap keymap[] = { /** * View switching * ~~~~~~~~~~~~~~ @@ -1701,10 +1811,15 @@ struct keymap keymap[] = { * Switch to pager view. * h:: * Show man page. - * Return:: - * If on a commit line show the commit diff. Addiionally, if in - * main or log view this will split the view. To open the commit - * diff in full size view either use 'd' or press Return twice. + * q:: + * Close view, if multiple views are open it will jump back to the + * previous view in the view stack. If it is the last open view it + * will quit. Use 'Q' to quit all views at once. + * Enter:: + * This key is "context sensitive" depending on what view you are + * currently in. When in log view on a commit line or in the main + * view, split the view and show the commit diff. In the diff view + * pressing Enter will simply scroll the view one line down. * Tab:: * Switch to next view. **/ @@ -1714,6 +1829,7 @@ struct keymap keymap[] = { { 'p', REQ_VIEW_PAGER }, { 'h', REQ_VIEW_HELP }, + { 'q', REQ_VIEW_CLOSE }, { KEY_TAB, REQ_VIEW_NEXT }, { KEY_RETURN, REQ_ENTER }, @@ -1721,18 +1837,21 @@ struct keymap keymap[] = { * Cursor navigation * ~~~~~~~~~~~~~~~~~ * Up:: - * Move curser one line up. + * Move cursor one line up. * Down:: * Move cursor one line down. * k:: - * Move curser one line up and enter. When used in the main view + * Move cursor one line up and enter. When used in the main view * this will always show the diff of the current commit in the * split diff view. * j:: * Move cursor one line down and enter. * PgUp:: - * Move curser one page up. + * b:: + * -:: + * Move cursor one page up. * PgDown:: + * Space:: * Move cursor one page down. * Home:: * Jump to first line. @@ -1746,7 +1865,10 @@ struct keymap keymap[] = { { KEY_HOME, REQ_MOVE_FIRST_LINE }, { KEY_END, REQ_MOVE_LAST_LINE }, { KEY_NPAGE, REQ_MOVE_PAGE_DOWN }, + { ' ', REQ_MOVE_PAGE_DOWN }, { KEY_PPAGE, REQ_MOVE_PAGE_UP }, + { 'b', REQ_MOVE_PAGE_UP }, + { '-', REQ_MOVE_PAGE_UP }, /** * Scrolling @@ -1768,14 +1890,14 @@ struct keymap keymap[] = { /** * Misc * ~~~~ - * q:: - * Quit + * Q:: + * Quit. * r:: * Redraw screen. * z:: * Stop all background loading. This can be useful if you use * tig(1) in a repository with a long history without limiting - * the log output. + * the revision log. * v:: * Show version. * n:: @@ -1786,7 +1908,7 @@ struct keymap keymap[] = { * * :log -p **/ - { 'q', REQ_QUIT }, + { 'Q', REQ_QUIT }, { 'z', REQ_STOP_LOADING }, { 'v', REQ_SHOW_VERSION }, { 'r', REQ_SCREEN_REDRAW }, @@ -1814,11 +1936,171 @@ get_request(int key) /* + * Unicode / UTF-8 handling + * + * NOTE: Much of the following code for dealing with unicode is derived from + * ELinks' UTF-8 code developed by Scrool . Origin file is + * src/intl/charset.c from the utf8 branch commit elinks-0.11.0-g31f2c28. + */ + +/* I've (over)annotated a lot of code snippets because I am not entirely + * confident that the approach taken by this small UTF-8 interface is correct. + * --jonas */ + +static inline int +unicode_width(unsigned long c) +{ + if (c >= 0x1100 && + (c <= 0x115f /* Hangul Jamo */ + || c == 0x2329 + || c == 0x232a + || (c >= 0x2e80 && c <= 0xa4cf && c != 0x303f) + /* CJK ... Yi */ + || (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */ + || (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */ + || (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */ + || (c >= 0xff00 && c <= 0xff60) /* Fullwidth Forms */ + || (c >= 0xffe0 && c <= 0xffe6) + || (c >= 0x20000 && c <= 0x2fffd) + || (c >= 0x30000 && c <= 0x3fffd))) + return 2; + + return 1; +} + +/* Number of bytes used for encoding a UTF-8 character indexed by first byte. + * Illegal bytes are set one. */ +static const unsigned char utf8_bytes[256] = { + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, + 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, + 3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 5,5,5,5,6,6,1,1, +}; + +/* Decode UTF-8 multi-byte representation into a unicode character. */ +static inline unsigned long +utf8_to_unicode(const char *string, size_t length) +{ + unsigned long unicode; + + switch (length) { + case 1: + unicode = string[0]; + break; + case 2: + unicode = (string[0] & 0x1f) << 6; + unicode += (string[1] & 0x3f); + break; + case 3: + unicode = (string[0] & 0x0f) << 12; + unicode += ((string[1] & 0x3f) << 6); + unicode += (string[2] & 0x3f); + break; + case 4: + unicode = (string[0] & 0x0f) << 18; + unicode += ((string[1] & 0x3f) << 12); + unicode += ((string[2] & 0x3f) << 6); + unicode += (string[3] & 0x3f); + break; + case 5: + unicode = (string[0] & 0x0f) << 24; + unicode += ((string[1] & 0x3f) << 18); + unicode += ((string[2] & 0x3f) << 12); + unicode += ((string[3] & 0x3f) << 6); + unicode += (string[4] & 0x3f); + break; + case 6: + unicode = (string[0] & 0x01) << 30; + unicode += ((string[1] & 0x3f) << 24); + unicode += ((string[2] & 0x3f) << 18); + unicode += ((string[3] & 0x3f) << 12); + unicode += ((string[4] & 0x3f) << 6); + unicode += (string[5] & 0x3f); + break; + default: + die("Invalid unicode length"); + } + + /* Invalid characters could return the special 0xfffd value but NUL + * should be just as good. */ + return unicode > 0xffff ? 0 : unicode; +} + +/* 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. + * + * 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) +{ + const char *start = string; + const char *end = strchr(string, '\0'); + size_t mbwidth = 0; + size_t width = 0; + + *trimmed = 0; + + while (string < end) { + int c = *(unsigned char *) string; + unsigned char bytes = utf8_bytes[c]; + size_t ucwidth; + unsigned long unicode; + + if (string + bytes > end) + break; + + /* Change representation to figure out whether + * it is a single- or double-width character. */ + + unicode = utf8_to_unicode(string, bytes); + /* FIXME: Graceful handling of invalid unicode character. */ + if (!unicode) + break; + + ucwidth = unicode_width(unicode); + width += ucwidth; + if (width > max_width) { + *trimmed = 1; + 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; + } + + *coloffset += mbwidth; + + return string - start; +} + + +/* * Status management */ /* Whether or not the curses interface has been initialized. */ -bool cursed = FALSE; +static bool cursed = FALSE; /* The status window is used for polling keystrokes. */ static WINDOW *status_win; @@ -1913,7 +2195,7 @@ init_display(void) */ static struct ref *refs; -size_t refs_size; +static size_t refs_size; static struct ref ** get_refs(char *id) @@ -1953,8 +2235,8 @@ get_refs(char *id) static int load_refs(void) { - char *cmd_env = getenv("TIG_LS_REMOTE"); - char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE; + const char *cmd_env = getenv("TIG_LS_REMOTE"); + const char *cmd = cmd_env && *cmd_env ? cmd_env : TIG_LS_REMOTE; FILE *pipe = popen(cmd, "r"); char buffer[BUFSIZ]; char *line; @@ -2015,6 +2297,9 @@ load_refs(void) pclose(pipe); + if (refs_size == 0) + die("Not a git repository"); + return OK; } @@ -2022,7 +2307,13 @@ load_refs(void) * Main */ -static void +#if __GNUC__ >= 3 +#define __NORETURN __attribute__((__noreturn__)) +#else +#define __NORETURN +#endif + +static void __NORETURN quit(int sig) { /* XXX: Restore tty modes and let the OS cleanup the rest! */ @@ -2031,7 +2322,8 @@ quit(int sig) exit(0); } -static void die(const char *err, ...) +static void __NORETURN +die(const char *err, ...) { va_list args; @@ -2124,10 +2416,36 @@ main(int argc, char *argv[]) } /** - * Specifying revisions - * -------------------- - * This section describes various ways to specify what revisions to - * display or otherwise limit the view to. + * [[refspec]] + * Revision specification + * ---------------------- + * This section describes various ways to specify what revisions to display + * or otherwise limit the view to. tig(1) does not itself parse the described + * revision options so refer to the relevant git man pages for futher + * information. Relevant man pages besides git-log(1) are git-diff(1) and + * git-rev-list(1). + * + * You can tune the interaction with git by making use of the options + * explained in this section. For example, by configuring the environment + * variables described in the <> section. + * + * Limit by path name + * ~~~~~~~~~~~~~~~~~~ + * If you are interested only in those revisions that made changes to a + * specific file (or even several files) list the files like this: + * + * $ tig log Makefile README + * + * To avoid ambiguity with repository references such as tag name, be sure + * to separate file names from other git options using "\--". So if you + * have a file named 'master' it will clash with the reference named + * 'master', and thus you will have to use: + * + * $ tig log -- master + * + * NOTE: For the main view, avoiding ambiguity will in some cases require + * you to specify two "\--" options. The first will make tig(1) stop + * option processing and the latter will be passed to git log. * * Limit by date or number * ~~~~~~~~~~~~~~~~~~~~~~~ @@ -2135,14 +2453,16 @@ main(int argc, char *argv[]) * to show both for the log and main view. Either limit by date using * e.g. `--since=1.month` or limit by the number of commits using `-n400`. * - * NOTE: You can tune the interaction with git by making use of the options - * explained in this section. + * If you are only interested in changed that happened between two dates + * you can use: * - * NOTE: tig(1) does not itself parse the revision options - * described in this section. + * $ tig -- --after="May 5th" --before="2006-05-16 15:44" * - * Ranges - * ~~~~~~ + * NOTE: If you want to avoid having to quote dates containing spaces you + * can use "." instead, e.g. `--after=May.5th`. + * + * Limiting by commit ranges + * ~~~~~~~~~~~~~~~~~~~~~~~~~ * Alternatively, commits can be limited to a specific range, such as * "all commits between 'tag-1.0' and 'tag-2.0'". For example: * @@ -2161,18 +2481,41 @@ main(int argc, char *argv[]) * ~~~~~~~~~~~~~~~~~~~~~~~~ * Git interprets the range specifier "tag-1.0..tag-2.0" as * "all commits reachable from 'tag-2.0' but not from 'tag-1.0'". + * Where reachability refers to what commits are ancestors (or part of the + * history) of the branch or tagged revision in question. + * * If you prefer to specify which commit to preview in this way use the * following: * * $ tig log tag-2.0 ^tag-1.0 * - * You can think of '^' as a negator. Using this alternate syntax, it is - * possible to furthur prune commits by specifying multiple negators. + * You can think of '^' as a negation operator. Using this alternate syntax, + * it is possible to further prune commits by specifying multiple branch + * cut offs. + * + * Combining revisions specification + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * Revisions options can to some degree be combined, which makes it possible + * to say "show at most 20 commits from within the last month that changed + * files under the Documentation/ directory." + * + * $ tig -- --since=1.month -n20 -- Documentation/ + * + * Examining all repository references + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * In some cases, it can be useful to query changes across all references + * in a repository. An example is to ask "did any line of development in + * this repository change a particular file within the last week". This + * can be accomplished using: + * + * $ tig -- --all --since=1.week -- Makefile * * BUGS * ---- * Known bugs and problems: * + * - In it's current state tig is pretty much UTF-8 only. + * * - If the screen width is very small the main view can draw * outside the current view causing bad wrapping. Same goes * for title and status windows. @@ -2200,5 +2543,6 @@ main(int argc, char *argv[]) * link:http://www.kernel.org/pub/software/scm/git/docs/[git(7)], * link:http://www.kernel.org/pub/software/scm/cogito/docs/[cogito(7)] * gitk(1): git repository browser written using tcl/tk, + * qgit(1): git repository browser written using c++/Qt, * gitview(1): git repository browser written using python/gtk. **/