Provide 'git merge --abort' as a synonym to 'git reset --merge'

diff --git a/builtin/merge.c b/builtin/merge.c
index 37d414b3ba95162953aec001e6036956eb1a97f6..0539f7c91289a5707330391424a81d8ba3ba7df9 100644 (file)
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -56,6 +56,7 @@ static size_t xopts_nr, xopts_alloc;
 static const char *branch;
 static int verbosity;
 static int allow_rerere_auto;
+static int abort_current_merge;
 
 static struct strategy all_strategy[] = {
        { "recursive",  DEFAULT_TWOHEAD | NO_TRIVIAL },
@@ -194,6 +195,8 @@ static struct option builtin_merge_options[] = {
                "message to be used for the merge commit (if any)",
                option_parse_message),
        OPT__VERBOSITY(&verbosity),
+       OPT_BOOLEAN(0, "abort", &abort_current_merge,
+               "abort the current in-progress merge"),
        OPT_END()
 };
 
@@ -895,22 +898,6 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
        const char *best_strategy = NULL, *wt_strategy = NULL;
        struct commit_list **remotes = &remoteheads;
 
-       if (read_cache_unmerged()) {
-               die_resolve_conflict("merge");
-       }
-       if (file_exists(git_path("MERGE_HEAD"))) {
-               /*
-                * There is no unmerged entry, don't advise 'git
-                * add/rm <file>', just 'git commit'.
-                */
-               if (advice_resolve_conflict)
-                       die("You have not concluded your merge (MERGE_HEAD exists).\n"
-                           "Please, commit your changes before you can merge.");
-               else
-                       die("You have not concluded your merge (MERGE_HEAD exists).");
-       }
-
-       resolve_undo_clear();
        /*
         * Check if we are _not_ on a detached HEAD, i.e. if there is a
         * current branch.
@@ -929,6 +916,34 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
 
        argc = parse_options(argc, argv, prefix, builtin_merge_options,
                        builtin_merge_usage, 0);
+
+       if (abort_current_merge) {
+               int nargc = 2;
+               const char *nargv[] = {"reset", "--merge", NULL};
+
+               if (!file_exists(git_path("MERGE_HEAD")))
+                       die("There is no merge to abort (MERGE_HEAD missing).");
+
+               /* Invoke 'git reset --merge' */
+               return cmd_reset(nargc, nargv, prefix);
+       }
+
+       if (read_cache_unmerged())
+               die_resolve_conflict("merge");
+
+       if (file_exists(git_path("MERGE_HEAD"))) {
+               /*
+                * There is no unmerged entry, don't advise 'git
+                * add/rm <file>', just 'git commit'.
+                */
+               if (advice_resolve_conflict)
+                       die("You have not concluded your merge (MERGE_HEAD exists).\n"
+                           "Please, commit your changes before you can merge.");
+               else
+                       die("You have not concluded your merge (MERGE_HEAD exists).");
+       }
+       resolve_undo_clear();
+
        if (verbosity < 0)
                show_diffstat = 0;
 
@@ -982,7 +997,7 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                reset_hard(remote_head->sha1, 0);
                return 0;
        } else {
-               struct strbuf msg = STRBUF_INIT;
+               struct strbuf merge_names = STRBUF_INIT;
 
                /* We are invoked directly as the first-class UI. */
                head_arg = "HEAD";
@@ -995,13 +1010,17 @@ int cmd_merge(int argc, const char **argv, const char *prefix)
                 * codepath so we discard the error in this
                 * loop.
                 */
-               if (!have_message) {
-                       for (i = 0; i < argc; i++)
-                               merge_name(argv[i], &msg);
-                       fmt_merge_msg(option_log, &msg, &merge_msg);
-                       if (merge_msg.len)
-                               strbuf_setlen(&merge_msg, merge_msg.len-1);
-               }
+               for (i = 0; i < argc; i++)
+                       merge_name(argv[i], &merge_names);
+
+               if (have_message && option_log)
+                       fmt_merge_msg_shortlog(&merge_names, &merge_msg);
+               else if (!have_message)
+                       fmt_merge_msg(option_log, &merge_names, &merge_msg);
+
+
+               if (!(have_message && !option_log) && merge_msg.len)
+                       strbuf_setlen(&merge_msg, merge_msg.len-1);
        }
 
        if (head_invalid || !argc)