Add rename support to the status view

Renames are now picked up and displayed with the 'R' flag instead of
being shown as a 'C'opy and 'D'eletion. Remove --find-copies-harder from
the arguments to diff-index and diff-files since this option seem to
interfere with rename detection.

diff --git a/tig.c b/tig.c
index 89a4c5d..8f78697 100644 (file)
--- a/tig.c
+++ b/tig.c
@@ -3165,12 +3165,13 @@ struct 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;
-       char name[SIZEOF_STR];
 };
 
 static struct status stage_status;
@@ -3188,7 +3189,7 @@ status_get_diff(struct status *file, char *buf, size_t bufsize)
        char *new_rev  = buf + 56;
        char *status   = buf + 97;
 
-       if (bufsize != 99 ||
+       if (bufsize < 99 ||
            old_mode[-1] != ':' ||
            new_mode[-1] != ' ' ||
            old_rev[-1]  != ' ' ||
@@ -3204,7 +3205,7 @@ status_get_diff(struct status *file, char *buf, size_t bufsize)
        file->old.mode = strtoul(old_mode, NULL, 8);
        file->new.mode = strtoul(new_mode, NULL, 8);
 
-       file->name[0] = 0;
+       file->old.name[0] = file->new.name[0] = 0;
 
        return TRUE;
 }
@@ -3271,7 +3272,7 @@ status_run(struct view *view, const char cmd[], bool diff, enum line_type type)
                                        unmerged = file;
 
                                } else if (unmerged) {
-                                       int collapse = !strcmp(buf, unmerged->name);
+                                       int collapse = !strcmp(buf, unmerged->new.name);
 
                                        unmerged = NULL;
                                        if (collapse) {
@@ -3282,10 +3283,26 @@ status_run(struct view *view, const char cmd[], bool diff, enum line_type type)
                                }
                        }
 
+                       /* 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->name, buf, sepsize);
+                       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;
@@ -3306,16 +3323,16 @@ error_out:
 }
 
 /* Don't show unmerged entries in the staged section. */
-#define STATUS_DIFF_INDEX_CMD "git diff-index -z --diff-filter=ACDMRTXB --cached HEAD"
+#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_DIFF_INDEX_SHOW_CMD \
-       "git diff-index --root --patch-with-stat --find-copies-harder -C --cached HEAD -- %s 2>/dev/null"
+       "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 --find-copies-harder -C -- %s 2>/dev/null"
+       "git diff-files --root --patch-with-stat -C -M -- %s %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
@@ -3417,7 +3434,7 @@ status_draw(struct view *view, struct line *line, unsigned int lineno, bool sele
        if (!selected)
                wattrset(view->win, A_NORMAL);
        wmove(view->win, lineno, 4);
-       waddstr(view->win, status->name);
+       waddstr(view->win, status->new.name);
 
        return TRUE;
 }
@@ -3426,7 +3443,8 @@ static enum request
 status_enter(struct view *view, struct line *line)
 {
        struct status *status = line->data;
-       char path[SIZEOF_STR] = "";
+       char oldpath[SIZEOF_STR] = "";
+       char newpath[SIZEOF_STR] = "";
        char *info;
        size_t cmdsize = 0;
 
@@ -3436,8 +3454,15 @@ status_enter(struct view *view, struct line *line)
                return REQ_NONE;
        }
 
-       if (status && sq_quote(path, 0, status->name) >= sizeof(path))
-               return REQ_QUIT;
+       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 &&
@@ -3447,7 +3472,7 @@ 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, path))
+                                       STATUS_DIFF_INDEX_SHOW_CMD, oldpath, newpath))
                        return REQ_QUIT;
                if (status)
                        info = "Staged changes to %s";
@@ -3457,7 +3482,7 @@ status_enter(struct view *view, struct line *line)
 
        case LINE_STAT_UNSTAGED:
                if (!string_format_from(opt_cmd, &cmdsize,
-                                       STATUS_DIFF_FILES_SHOW_CMD, path))
+                                       STATUS_DIFF_FILES_SHOW_CMD, oldpath, newpath))
                        return REQ_QUIT;
                if (status)
                        info = "Unstaged changes to %s";
@@ -3475,7 +3500,7 @@ status_enter(struct view *view, struct line *line)
                        return REQ_NONE;
                }
 
-               opt_pipe = fopen(status->name, "r");
+               opt_pipe = fopen(status->new.name, "r");
                info = "Untracked file %s";
                break;
 
@@ -3492,7 +3517,7 @@ status_enter(struct view *view, struct line *line)
                }
 
                stage_line_type = line->type;
-               string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.name);
+               string_format(VIEW(REQ_VIEW_STAGE)->ref, info, stage_status.new.name);
        }
 
        return REQ_NONE;
@@ -3519,7 +3544,7 @@ status_update_file(struct view *view, struct status *status, enum line_type type
                if (!string_format_from(buf, &bufsize, "%06o %s\t%s%c",
                                        status->old.mode,
                                        status->old.rev,
-                                       status->name, 0))
+                                       status->old.name, 0))
                        return FALSE;
 
                string_add(cmd, cmdsize, "git update-index -z --index-info");
@@ -3527,7 +3552,7 @@ status_update_file(struct view *view, struct status *status, enum line_type type
 
        case LINE_STAT_UNSTAGED:
        case LINE_STAT_UNTRACKED:
-               if (!string_format_from(buf, &bufsize, "%s%c", status->name, 0))
+               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");
@@ -3591,14 +3616,14 @@ status_request(struct view *view, enum request request, struct line *line)
                        report("Merging only possible for files with unmerged status ('U').");
                        return REQ_NONE;
                }
-               open_mergetool(status->name);
+               open_mergetool(status->new.name);
                break;
 
        case REQ_EDIT:
                if (!status)
                        return request;
 
-               open_editor(status->status != '?', status->name);
+               open_editor(status->status != '?', status->new.name);
                break;
 
        case REQ_ENTER:
@@ -3629,7 +3654,7 @@ status_select(struct view *view, struct line *line)
        char *text;
        char *key;
 
-       if (status && !string_format(file, "'%s'", status->name))
+       if (status && !string_format(file, "'%s'", status->new.name))
                return;
 
        if (!status && line[1].type == LINE_STAT_NONE)
@@ -3682,7 +3707,7 @@ status_grep(struct view *view, struct line *line)
                char *text;
 
                switch (state) {
-               case S_NAME:    text = status->name;    break;
+               case S_NAME:    text = status->new.name;        break;
                case S_STATUS:
                        buf[0] = status->status;
                        text = buf;
@@ -3847,10 +3872,10 @@ stage_request(struct view *view, enum request request, struct line *line)
                break;
 
        case REQ_EDIT:
-               if (!stage_status.name[0])
+               if (!stage_status.new.name[0])
                        return request;
 
-               open_editor(stage_status.status != '?', stage_status.name);
+               open_editor(stage_status.status != '?', stage_status.new.name);
                break;
 
        case REQ_ENTER: