status: don't say 'HEAD detached at HEAD'mm/detach-at-HEAD-reflog

After using "git checkout --detach", the reflog is left with an entry
like

  checkout: moving from ... to HEAD

This message is parsed to generate the 'HEAD detached at' message in
'git branch' and 'git status', which leads to the not-so-useful message
'HEAD detached at HEAD'.

Instead, when parsing such reflog entry, resolve HEAD to the
corresponding commit in the reflog, so that the message becomes 'HEAD
detached at $sha1'.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/wt-status.c b/wt-status.c
index 078a472743..fd9d98b399 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1204,6 +1204,12 @@ static int grab_1st_switch(unsigned char *osha1, unsigned char *nsha1,
 	hashcpy(cb->nsha1, nsha1);
 	for (end = target; *end && *end != '\n'; end++)
 		;
+	if (!memcmp(target, "HEAD", end - target)) {
+		/* HEAD is relative. Resolve it to the right reflog entry. */
+		strbuf_addstr(&cb->buf,
+			      find_unique_abbrev(nsha1, DEFAULT_ABBREV));
+		return 1;
+	}
 	strbuf_add(&cb->buf, target, end - target);
 	return 1;
 }