Teach "git reflog" a subcommand to delete single entries

This commit implements the "delete" subcommand:

	git reflog delete master@{2}

will delete the second reflog entry of the "master" branch.

With this, it should be easy to implement "git stash pop" everybody
seems to want these days.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

diff --git a/Documentation/git-reflog.txt b/Documentation/git-reflog.txt
index 5c7316ceb82fbedc1413dfd8a4b1d8095b4d7a06..a0c7ceead2174eb7d9498f1575ee0df4065da433 100644 (file)
--- a/Documentation/git-reflog.txt
+++ b/Documentation/git-reflog.txt
@@ -19,6 +19,8 @@ depending on the subcommand:
 git reflog expire [--dry-run] [--stale-fix] [--verbose]
        [--expire=<time>] [--expire-unreachable=<time>] [--all] <refs>...
 
+git reflog delete ref@\{specifier\}...
+
 git reflog [show] [log-options]
 
 Reflog is a mechanism to record when the tip of branches are
@@ -36,6 +38,9 @@ subcommands) will take all the normal log options, and show the log of
 It is basically an alias for 'git log -g --abbrev-commit
 --pretty=oneline', see gitlink:git-log[1].
 
+To delete single entries from the reflog, use the subcommand "delete"
+and specify the _exact_ entry (e.g. ``git reflog delete master@\{2\}'').
+
 
 OPTIONS
 -------

diff --git a/builtin-reflog.c b/builtin-reflog.c
index ce093cad78ce8008cd8a60d3ab6be5663a712a9d..f4226939a918c6f40a2be2dcb1d62a7dd497415a 100644 (file)
--- a/builtin-reflog.c
+++ b/builtin-reflog.c
@@ -25,6 +25,7 @@ struct cmd_reflog_expire_cb {
        int verbose;
        unsigned long expire_total;
        unsigned long expire_unreachable;
+       int recno;
 };
 
 struct expire_reflog_cb {
@@ -220,6 +221,9 @@ static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
                        goto prune;
        }
 
+       if (cb->cmd->recno && --(cb->cmd->recno) == 0)
+               goto prune;
+
        if (cb->newlog) {
                char sign = (tz < 0) ? '-' : '+';
                int zone = (tz < 0) ? (-tz) : tz;
@@ -363,6 +367,58 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
        return status;
 }
 
+static int count_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
+               const char *email, unsigned long timestamp, int tz,
+               const char *message, void *cb_data)
+{
+       struct cmd_reflog_expire_cb *cb = cb_data;
+       if (!cb->expire_total || timestamp < cb->expire_total)
+               cb->recno++;
+       return 0;
+}
+
+static int cmd_reflog_delete(int argc, const char **argv, const char *prefix)
+{
+       struct cmd_reflog_expire_cb cb;
+       int i, status = 0;
+
+       if (argc < 2)
+               return error("Nothing to delete?");
+
+       memset(&cb, 0, sizeof(cb));
+
+       for (i = 1; i < argc; i++) {
+               const char *spec = strstr(argv[i], "@{");
+               unsigned char sha1[20];
+               char *ep, *ref;
+               int recno;
+
+               if (!spec) {
+                       status |= error("Not a reflog: %s", ref);
+                       continue;
+               }
+
+               if (!dwim_ref(argv[i], spec - argv[i], sha1, &ref)) {
+                       status |= error("%s points nowhere!", argv[i]);
+                       continue;
+               }
+
+               recno = strtoul(spec + 2, &ep, 10);
+               if (*ep == '}') {
+                       cb.recno = -recno;
+                       for_each_reflog_ent(ref, count_reflog_ent, &cb);
+               } else {
+                       cb.expire_total = approxidate(spec + 2);
+                       for_each_reflog_ent(ref, count_reflog_ent, &cb);
+                       cb.expire_total = 0;
+               }
+
+               status |= expire_reflog(ref, sha1, 0, &cb);
+               free(ref);
+       }
+       return status;
+}
+
 /*
  * main "reflog"
  */
@@ -382,6 +438,9 @@ int cmd_reflog(int argc, const char **argv, const char *prefix)
        if (!strcmp(argv[1], "expire"))
                return cmd_reflog_expire(argc - 1, argv + 1, prefix);
 
+       if (!strcmp(argv[1], "delete"))
+               return cmd_reflog_delete(argc - 1, argv + 1, prefix);
+
        /* Not a recognized reflog command..*/
        usage(reflog_usage);
 }

diff --git a/t/t1410-reflog.sh b/t/t1410-reflog.sh
index e5bbc384f7f4e56b13a13bf2bedad1427e257652..12a53edfdc189cd27924e38ab7158f595c873af4 100755 (executable)
--- a/t/t1410-reflog.sh
+++ b/t/t1410-reflog.sh
@@ -175,4 +175,30 @@ test_expect_success 'recover and check' '
 
 '
 
+test_expect_success 'delete' '
+       echo 1 > C &&
+       test_tick &&
+       git commit -m rat C &&
+
+       echo 2 > C &&
+       test_tick &&
+       git commit -m ox C &&
+
+       echo 3 > C &&
+       test_tick &&
+       git commit -m tiger C &&
+
+       test 5 = $(git reflog | wc -l) &&
+
+       git reflog delete master@{1} &&
+       git reflog show master > output &&
+       test 4 = $(wc -l < output) &&
+       ! grep ox < output &&
+
+       git reflog delete master@{07.04.2005.15:15:00.-0700} &&
+       git reflog show master > output &&
+       test 3 = $(wc -l < output) &&
+       ! grep dragon < output
+'
+
 test_done