make oneline reflog dates more consistent with multiline format

The multiline reflog format (e.g., as shown by "git log -g")
will show HEAD@{<date>} rather than HEAD@{<count>} in two
situations:

  1. If the user gave branch@{<date>} syntax to specify the
     reflog

  2. If the user gave a --date=<format> specifier

It uses the "normal" date format in case 1, and the
user-specified format in case 2.

The oneline reflog format (e.g., "git reflog show" or "git
log -g --oneline") will show the date in the same two
circumstances. However, it _always_ shows the date as a
relative date, and it always ignores the timezone.

In case 2, it seems ridiculous to trigger the date but use a
format totally different from what the user requested.

For case 1, it is arguable that the user might want to see
the relative date by default; however, the multiline version
shows the normal format.

This patch does three things:

  - refactors the "relative_date" parameter to
    show_reflog_message to be an actual date_mode enum,
    since this is how it is used (it is passed to show_date)

  - uses the passed date_mode parameter in the oneline
    format (making it consistent with the multiline format)

  - does not ignore the timezone parameter in oneline mode

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

reflog-walk.c

@@ -242,7 +242,7 @@ void fake_reflog_parent(struct reflog_walk_info *info, struct commit *commit)
 }
 
 void show_reflog_message(struct reflog_walk_info* info, int oneline,
-	int relative_date)
+	enum date_mode dmode)
 {
 	if (info && info->last_commit_reflog) {
 		struct commit_reflog *commit_reflog = info->last_commit_reflog;
@@ -251,19 +251,21 @@ void show_reflog_message(struct reflog_walk_info* info, int oneline,
 		info = &commit_reflog->reflogs->items[commit_reflog->recno+1];
 		if (oneline) {
 			printf("%s@{", commit_reflog->reflogs->ref);
-			if (commit_reflog->flag || relative_date)
-				printf("%s", show_date(info->timestamp, 0, 1));
+			if (commit_reflog->flag || dmode)
+				printf("%s", show_date(info->timestamp,
+						       info->tz,
+						       dmode));
 			else
 				printf("%d", commit_reflog->reflogs->nr
 				       - 2 - commit_reflog->recno);
 			printf("}: %s", info->message);
 		}
 		else {
 			printf("Reflog: %s@{", commit_reflog->reflogs->ref);
-			if (commit_reflog->flag || relative_date)
+			if (commit_reflog->flag || dmode)
 				printf("%s", show_date(info->timestamp,
 							info->tz,
-							relative_date));
+							dmode));
 			else
 				printf("%d", commit_reflog->reflogs->nr
 				       - 2 - commit_reflog->recno);

reflog-walk.h

@@ -1,11 +1,14 @@
 #ifndef REFLOG_WALK_H
 #define REFLOG_WALK_H
 
+#include "cache.h"
+
 extern void init_reflog_walk(struct reflog_walk_info** info);
 extern int add_reflog_for_walk(struct reflog_walk_info *info,
 		struct commit *commit, const char *name);
 extern void fake_reflog_parent(struct reflog_walk_info *info,
 		struct commit *commit);
-extern void show_reflog_message(struct reflog_walk_info *info, int, int);
+extern void show_reflog_message(struct reflog_walk_info *info, int,
+		enum date_mode);
 
 #endif

t/t1411-reflog-show.sh

@@ -0,0 +1,67 @@
+#!/bin/sh
+
+test_description='Test reflog display routines'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo content >file &&
+	git add file &&
+	test_tick &&
+	git commit -m one
+'
+
+cat >expect <<'EOF'
+Reflog: HEAD@{0} (C O Mitter <committer@example.com>)
+Reflog message: commit (initial): one
+EOF
+test_expect_success 'log -g shows reflog headers' '
+	git log -g -1 >tmp &&
+	grep ^Reflog <tmp >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+e46513e HEAD@{0}: commit (initial): one
+EOF
+test_expect_success 'oneline reflog format' '
+	git log -g -1 --oneline >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+Reflog: HEAD@{Thu Apr 7 15:13:13 2005 -0700} (C O Mitter <committer@example.com>)
+Reflog message: commit (initial): one
+EOF
+test_expect_success 'using @{now} syntax shows reflog date (multiline)' '
+	git log -g -1 HEAD@{now} >tmp &&
+	grep ^Reflog <tmp >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+e46513e HEAD@{Thu Apr 7 15:13:13 2005 -0700}: commit (initial): one
+EOF
+test_expect_success 'using @{now} syntax shows reflog date (oneline)' '
+	git log -g -1 --oneline HEAD@{now} >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+Reflog: HEAD@{1112911993 -0700} (C O Mitter <committer@example.com>)
+Reflog message: commit (initial): one
+EOF
+test_expect_success 'using --date= shows reflog date (multiline)' '
+	git log -g -1 --date=raw >tmp &&
+	grep ^Reflog <tmp >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+e46513e HEAD@{1112911993 -0700}: commit (initial): one
+EOF
+test_expect_success 'using --date= shows reflog date (oneline)' '
+	git log -g -1 --oneline --date=raw >actual &&
+	test_cmp expect actual
+'
+
+test_done