git log: support "auto" decorations

diff --git a/revision.c b/revision.c
index 85085501f66b02a9cff9b404f34c0925270cea7f..71e233742331a435edeadacc7c6a52226bb18b7a 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -1837,6 +1837,14 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->notes_opt.use_default_notes = 1;
        } else if (!strcmp(arg, "--show-signature")) {
                revs->show_signature = 1;
+       } else if (!strcmp(arg, "--show-linear-break") ||
+                  starts_with(arg, "--show-linear-break=")) {
+               if (starts_with(arg, "--show-linear-break="))
+                       revs->break_bar = xstrdup(arg + 20);
+               else
+                       revs->break_bar = "                    ..........";
+               revs->track_linear = 1;
+               revs->track_first_time = 1;
        } else if (starts_with(arg, "--show-notes=") ||
                   starts_with(arg, "--notes=")) {
                struct strbuf buf = STRBUF_INIT;
@@ -1960,6 +1968,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                        unkv[(*unkc)++] = arg;
                return opts;
        }
+       if (revs->graph && revs->track_linear)
+               die("--show-linear-break and --graph are incompatible");
 
        return 1;
 }
@@ -2902,6 +2912,27 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
        return action;
 }
 
+static void track_linear(struct rev_info *revs, struct commit *commit)
+{
+       if (revs->track_first_time) {
+               revs->linear = 1;
+               revs->track_first_time = 0;
+       } else {
+               struct commit_list *p;
+               for (p = revs->previous_parents; p; p = p->next)
+                       if (p->item == NULL || /* first commit */
+                           !hashcmp(p->item->object.sha1, commit->object.sha1))
+                               break;
+               revs->linear = p != NULL;
+       }
+       if (revs->reverse) {
+               if (revs->linear)
+                       commit->object.flags |= TRACK_LINEAR;
+       }
+       free_commit_list(revs->previous_parents);
+       revs->previous_parents = copy_commit_list(commit->parents);
+}
+
 static struct commit *get_revision_1(struct rev_info *revs)
 {
        if (!revs->commits)
@@ -2929,9 +2960,11 @@ static struct commit *get_revision_1(struct rev_info *revs)
                        if (revs->max_age != -1 &&
                            (commit->date < revs->max_age))
                                continue;
-                       if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0)
-                               die("Failed to traverse parents of commit %s",
-                                   sha1_to_hex(commit->object.sha1));
+                       if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
+                               if (!revs->ignore_missing_links)
+                                       die("Failed to traverse parents of commit %s",
+                                               sha1_to_hex(commit->object.sha1));
+                       }
                }
 
                switch (simplify_commit(revs, commit)) {
@@ -2941,6 +2974,8 @@ static struct commit *get_revision_1(struct rev_info *revs)
                        die("Failed to simplify parents of commit %s",
                            sha1_to_hex(commit->object.sha1));
                default:
+                       if (revs->track_linear)
+                               track_linear(revs, commit);
                        return commit;
                }
        } while (revs->commits);
@@ -3107,14 +3142,23 @@ struct commit *get_revision(struct rev_info *revs)
                revs->reverse_output_stage = 1;
        }
 
-       if (revs->reverse_output_stage)
-               return pop_commit(&revs->commits);
+       if (revs->reverse_output_stage) {
+               c = pop_commit(&revs->commits);
+               if (revs->track_linear)
+                       revs->linear = !!(c && c->object.flags & TRACK_LINEAR);
+               return c;
+       }
 
        c = get_revision_internal(revs);
        if (c && revs->graph)
                graph_update(revs->graph, c);
-       if (!c)
+       if (!c) {
                free_saved_parents(revs);
+               if (revs->previous_parents) {
+                       free_commit_list(revs->previous_parents);
+                       revs->previous_parents = NULL;
+               }
+       }
        return c;
 }