compat: Add simplified merge sort implementation from glibc

diff --git a/builtin-revert.c b/builtin-revert.c
index 62ab1fa1f484a113f45da96de8cd209a0c5c522e..358af537476b0b558989f27fe60627af6977635b 100644 (file)
--- a/builtin-revert.c
+++ b/builtin-revert.c
@@ -30,7 +30,7 @@ static const char * const cherry_pick_usage[] = {
        NULL
 };
 
-static int edit, no_replay, no_commit, needed_deref, mainline;
+static int edit, no_replay, no_commit, mainline;
 static enum { REVERT, CHERRY_PICK } action;
 static struct commit *commit;
 
@@ -66,7 +66,6 @@ static void parse_args(int argc, const char **argv)
        if (commit->object.type == OBJ_TAG) {
                commit = (struct commit *)
                        deref_tag((struct object *)commit, arg, strlen(arg));
-               needed_deref = 1;
        }
        if (commit->object.type != OBJ_COMMIT)
                die ("'%s' does not point to a commit", arg);
@@ -225,6 +224,27 @@ static int merge_recursive(const char *base_sha1,
        return run_command_v_opt(argv, RUN_COMMAND_NO_STDIN | RUN_GIT_CMD);
 }
 
+static char *help_msg(const unsigned char *sha1)
+{
+       static char helpbuf[1024];
+       char *msg = getenv("GIT_CHERRY_PICK_HELP");
+
+       if (msg)
+               return msg;
+
+       strcpy(helpbuf, "  After resolving the conflicts,\n"
+              "mark the corrected paths with 'git add <paths>' "
+              "or 'git rm <paths>' and commit the result.");
+
+       if (action == CHERRY_PICK) {
+               sprintf(helpbuf + strlen(helpbuf),
+                       "\nWhen commiting, use the option "
+                       "'-c %s' to retain authorship and message.",
+                       find_unique_abbrev(sha1, DEFAULT_ABBREV));
+       }
+       return helpbuf;
+}
+
 static int revert_or_cherry_pick(int argc, const char **argv)
 {
        unsigned char head[20];
@@ -246,7 +266,9 @@ static int revert_or_cherry_pick(int argc, const char **argv)
        if (no_commit) {
                /*
                 * We do not intend to commit immediately.  We just want to
-                * merge the differences in.
+                * merge the differences in, so let's compute the tree
+                * that represents the "current" state for merge-recursive
+                * to work on.
                 */
                if (write_tree(head, 0, NULL))
                        die ("Your index file is unmerged.");
@@ -256,7 +278,7 @@ static int revert_or_cherry_pick(int argc, const char **argv)
                if (get_sha1("HEAD", head))
                        die ("You do not have a valid HEAD");
                wt_status_prepare(&s);
-               if (s.commitable || s.workdir_dirty)
+               if (s.commitable)
                        die ("Dirty index: cannot %s", me);
                discard_cache();
        }
@@ -331,17 +353,6 @@ static int revert_or_cherry_pick(int argc, const char **argv)
                        add_to_msg(")\n");
                }
        }
-       if (needed_deref) {
-               add_to_msg("(original 'git ");
-               add_to_msg(me);
-               add_to_msg("' arguments: ");
-               for (i = 0; i < argc; i++) {
-                       if (i)
-                               add_to_msg(" ");
-                       add_to_msg(argv[i]);
-               }
-               add_to_msg(")\n");
-       }
 
        if (merge_recursive(sha1_to_hex(base->object.sha1),
                                sha1_to_hex(head), "HEAD",
@@ -360,21 +371,13 @@ static int revert_or_cherry_pick(int argc, const char **argv)
                                        i++;
                        }
                }
-               if (close(msg_fd) || commit_lock_file(&msg_file) < 0)
+               if (commit_lock_file(&msg_file) < 0)
                        die ("Error wrapping up %s", defmsg);
-               fprintf(stderr, "Automatic %s failed.  "
-                       "After resolving the conflicts,\n"
-                       "mark the corrected paths with 'git add <paths>' "
-                       "and commit the result.\n", me);
-               if (action == CHERRY_PICK) {
-                       fprintf(stderr, "When commiting, use the option "
-                               "'-c %s' to retain authorship and message.\n",
-                               find_unique_abbrev(commit->object.sha1,
-                                       DEFAULT_ABBREV));
-               }
+               fprintf(stderr, "Automatic %s failed.%s\n",
+                       me, help_msg(commit->object.sha1));
                exit(1);
        }
-       if (close(msg_fd) || commit_lock_file(&msg_file) < 0)
+       if (commit_lock_file(&msg_file) < 0)
                die ("Error wrapping up %s", defmsg);
        fprintf(stderr, "Finished one %s.\n", me);