git-config-set: add more options
[git.git] / show-branch.c
index c117c53..631336c 100644 (file)
@@ -133,12 +133,28 @@ static void name_commits(struct commit_list *list,
                        nth = 0;
                        while (parents) {
                                struct commit *p = parents->item;
-                               char newname[1000];
+                               char newname[1000], *en;
                                parents = parents->next;
                                nth++;
                                if (p->object.util)
                                        continue;
-                               sprintf(newname, "%s^%d", n->head_name, nth);
+                               en = newname;
+                               switch (n->generation) {
+                               case 0:
+                                       en += sprintf(en, "%s", n->head_name);
+                                       break;
+                               case 1:
+                                       en += sprintf(en, "%s^", n->head_name);
+                                       break;
+                               default:
+                                       en += sprintf(en, "%s~%d",
+                                               n->head_name, n->generation);
+                                       break;
+                               }
+                               if (nth == 1)
+                                       en += sprintf(en, "^");
+                               else
+                                       en += sprintf(en, "^%d", nth);
                                name_commit(p, strdup(newname), 0);
                                i++;
                                name_first_parent_chain(p);
@@ -165,11 +181,11 @@ static void join_revs(struct commit_list **list_p,
 
        while (*list_p) {
                struct commit_list *parents;
+               int still_interesting = !!interesting(*list_p);
                struct commit *commit = pop_one_commit(list_p);
                int flags = commit->object.flags & all_mask;
-               int still_interesting = !!interesting(*list_p);
 
-               if (!still_interesting && extra < 0)
+               if (!still_interesting && extra <= 0)
                        break;
 
                mark_seen(commit, seen_p);
@@ -183,30 +199,83 @@ static void join_revs(struct commit_list **list_p,
                        parents = parents->next;
                        if ((this_flag & flags) == flags)
                                continue;
-                       parse_commit(p);
+                       if (!p->object.parsed)
+                               parse_commit(p);
                        if (mark_seen(p, seen_p) && !still_interesting)
                                extra--;
                        p->object.flags |= flags;
                        insert_by_date(p, list_p);
                }
        }
+
+       /*
+        * Postprocess to complete well-poisoning.
+        *
+        * At this point we have all the commits we have seen in
+        * seen_p list (which happens to be sorted chronologically but
+        * it does not really matter).  Mark anything that can be
+        * reached from uninteresting commits not interesting.
+        */
+       for (;;) {
+               int changed = 0;
+               struct commit_list *s;
+               for (s = *seen_p; s; s = s->next) {
+                       struct commit *c = s->item;
+                       struct commit_list *parents;
+
+                       if (((c->object.flags & all_revs) != all_revs) &&
+                           !(c->object.flags & UNINTERESTING))
+                               continue;
+
+                       /* The current commit is either a merge base or
+                        * already uninteresting one.  Mark its parents
+                        * as uninteresting commits _only_ if they are
+                        * already parsed.  No reason to find new ones
+                        * here.
+                        */
+                       parents = c->parents;
+                       while (parents) {
+                               struct commit *p = parents->item;
+                               parents = parents->next;
+                               if (!(p->object.flags & UNINTERESTING)) {
+                                       p->object.flags |= UNINTERESTING;
+                                       changed = 1;
+                               }
+                       }
+               }
+               if (!changed)
+                       break;
+       }
 }
 
-static void show_one_commit(struct commit *commit)
+static void show_one_commit(struct commit *commit, int no_name)
 {
-       char pretty[128], *cp;
+       char pretty[256], *cp;
        struct commit_name *name = commit->object.util;
-       pretty_print_commit(CMIT_FMT_ONELINE, commit->buffer, ~0,
-                           pretty, sizeof(pretty));
+       if (commit->object.parsed)
+               pretty_print_commit(CMIT_FMT_ONELINE, commit->buffer, ~0,
+                                   pretty, sizeof(pretty));
+       else
+               strcpy(pretty, "(unavailable)");
        if (!strncmp(pretty, "[PATCH] ", 8))
                cp = pretty + 8;
        else
                cp = pretty;
-       if (name && name->head_name) {
-               printf("[%s", name->head_name);
-               if (name->generation)
-                       printf("~%d", name->generation);
-               printf("] ");
+
+       if (!no_name) {
+               if (name && name->head_name) {
+                       printf("[%s", name->head_name);
+                       if (name->generation) {
+                               if (name->generation == 1)
+                                       printf("^");
+                               else
+                                       printf("~%d", name->generation);
+                       }
+                       printf("] ");
+               }
+               else
+                       printf("[%s] ",
+                              find_unique_abbrev(commit->object.sha1, 7));
        }
        puts(cp);
 }
@@ -231,7 +300,7 @@ static int append_ref(const char *refname, const unsigned char *sha1)
        struct commit *commit = lookup_commit_reference_gently(sha1, 1);
        if (!commit)
                return 0;
-       if (MAX_REVS < ref_name_cnt) {
+       if (MAX_REVS <= ref_name_cnt) {
                fprintf(stderr, "warning: ignoring %s; "
                        "cannot handle more than %d refs",
                        refname, MAX_REVS);
@@ -331,13 +400,17 @@ int main(int ac, char **av)
        unsigned int rev_mask[MAX_REVS];
        int num_rev, i, extra = 0;
        int all_heads = 0, all_tags = 0;
-       int all_mask, all_revs, shown_merge_point;
+       int all_mask, all_revs;
        char head_path[128];
+       const char *head_path_p;
        int head_path_len;
        unsigned char head_sha1[20];
        int merge_base = 0;
        int independent = 0;
-       char **label;
+       int no_name = 0;
+       int sha1_name = 0;
+       int shown_merge_point = 0;
+       int topo_order = 0;
 
        setup_git_directory();
 
@@ -353,12 +426,18 @@ int main(int ac, char **av)
                        extra = 1;
                else if (!strcmp(arg, "--list"))
                        extra = -1;
+               else if (!strcmp(arg, "--no-name"))
+                       no_name = 1;
+               else if (!strcmp(arg, "--sha1-name"))
+                       sha1_name = 1;
                else if (!strncmp(arg, "--more=", 7))
                        extra = atoi(arg + 7);
                else if (!strcmp(arg, "--merge-base"))
                        merge_base = 1;
                else if (!strcmp(arg, "--independent"))
                        independent = 1;
+               else if (!strcmp(arg, "--topo-order"))
+                       topo_order = 1;
                else
                        usage(show_branch_usage);
                ac--; av++;
@@ -414,11 +493,15 @@ int main(int ac, char **av)
        if (0 <= extra)
                join_revs(&list, &seen, num_rev, extra);
 
-       head_path_len = readlink(".git/HEAD", head_path, sizeof(head_path)-1);
-       if ((head_path_len < 0) || get_sha1("HEAD", head_sha1))
+       head_path_p = resolve_ref(git_path("HEAD"), head_sha1, 1);
+       if (head_path_p) {
+               head_path_len = strlen(head_path_p);
+               memcpy(head_path, head_path_p, head_path_len + 1);
+       }
+       else {
+               head_path_len = 0;
                head_path[0] = 0;
-       else
-               head_path[head_path_len] = 0;
+       }
 
        if (merge_base)
                return show_merge_base(seen, num_rev);
@@ -427,7 +510,7 @@ int main(int ac, char **av)
                return show_independent(rev, num_rev, ref_name, rev_mask);
 
        /* Show list; --more=-1 means list-only */
-       if (1 < num_rev) {
+       if (1 < num_rev || extra < 0) {
                for (i = 0; i < num_rev; i++) {
                        int j;
                        int is_head = rev_is_head(head_path,
@@ -444,7 +527,8 @@ int main(int ac, char **av)
                                printf("%c [%s] ",
                                       is_head ? '*' : '!', ref_name[i]);
                        }
-                       show_one_commit(rev[i]);
+                       /* header lines never need name */
+                       show_one_commit(rev[i], 1);
                }
                if (0 <= extra) {
                        for (i = 0; i < num_rev; i++)
@@ -456,23 +540,21 @@ int main(int ac, char **av)
                exit(0);
 
        /* Sort topologically */
-       sort_in_topological_order(&seen);
+       if (topo_order)
+               sort_in_topological_order(&seen);
 
        /* Give names to commits */
-       name_commits(seen, rev, ref_name, num_rev);
+       if (!sha1_name && !no_name)
+               name_commits(seen, rev, ref_name, num_rev);
 
        all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
        all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
-       shown_merge_point = 0;
 
        while (seen) {
                struct commit *commit = pop_one_commit(&seen);
                int this_flag = commit->object.flags;
-               int is_merge_point = (this_flag & all_revs) == all_revs;
-               static char *obvious[] = { "" };
 
-               if (is_merge_point)
-                       shown_merge_point = 1;
+               shown_merge_point |= ((this_flag & all_revs) == all_revs);
 
                if (1 < num_rev) {
                        for (i = 0; i < num_rev; i++)
@@ -480,12 +562,10 @@ int main(int ac, char **av)
                                        ? '+' : ' ');
                        putchar(' ');
                }
-               show_one_commit(commit);
-               if (num_rev == 1)
-                       label = obvious;
-               if (shown_merge_point && is_merge_point)
-                       if (--extra < 0)
-                               break;
+               show_one_commit(commit, no_name);
+
+               if (shown_merge_point && --extra < 0)
+                       break;
        }
        return 0;
 }