rebase: add --reset-author-date

The previous commit introduced --ignore-date flag to rebase -i, but the
name is rather vague as it does not say whether the author date or the
committer date is ignored. Add an alias to convey the precise purpose.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-rebase.txt

@@ -450,6 +450,7 @@ See also INCOMPATIBLE OPTIONS below.
 	date. This option implies `--force-rebase`.
 
 --ignore-date::
+--reset-author-date::
 	Instead of using the author date of the original commit, use
 	the current time as the	author date of the rebased commit.  This
 	option implies `--force-rebase`.

builtin/rebase.c

@@ -1505,8 +1505,10 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		OPT_BOOL(0, "committer-date-is-author-date",
 			 &options.committer_date_is_author_date,
 			 N_("make committer date match author date")),
-		OPT_BOOL(0, "ignore-date", &options.ignore_date,
+		OPT_BOOL(0, "reset-author-date", &options.ignore_date,
 			 N_("ignore author date and use current date")),
+		OPT_HIDDEN_BOOL(0, "ignore-date", &options.ignore_date,
+				N_("synonym of --reset-author-date")),
 		OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
 				  N_("passed to 'git apply'"), 0),
 		OPT_BOOL(0, "ignore-whitespace", &ignore_whitespace,

t/t3436-rebase-more-options.sh

@@ -117,20 +117,20 @@ test_atime_is_ignored () {
 	! grep -v +0000 authortime
 }
 
-test_expect_success '--ignore-date works with apply backend' '
+test_expect_success '--reset-author-date works with apply backend' '
 	git commit --amend --date="$GIT_AUTHOR_DATE" &&
-	git rebase --apply --ignore-date HEAD^ &&
+	git rebase --apply --reset-author-date HEAD^ &&
 	test_atime_is_ignored -1
 '
 
-test_expect_success '--ignore-date works with merge backend' '
+test_expect_success '--reset-author-date works with merge backend' '
 	git commit --amend --date="$GIT_AUTHOR_DATE" &&
-	git rebase --ignore-date -m HEAD^ &&
+	git rebase --reset-author-date -m HEAD^ &&
 	test_atime_is_ignored -1
 '
 
-test_expect_success '--ignore-date works after conflict resolution' '
-	test_must_fail git rebase --ignore-date -m \
+test_expect_success '--reset-author-date works after conflict resolution' '
+	test_must_fail git rebase --reset-author-date -m \
 		--onto commit2^^ commit2^ commit2 &&
 	echo resolved >foo &&
 	git add foo &&
@@ -138,16 +138,16 @@ test_expect_success '--ignore-date works after conflict resolution' '
 	test_atime_is_ignored -1
 '
 
-test_expect_success '--ignore-date works with rebase -r' '
+test_expect_success '--reset-author-date works with rebase -r' '
 	git checkout side &&
 	git merge --no-ff commit3 &&
-	git rebase -r --root --ignore-date &&
+	git rebase -r --root --reset-author-date &&
 	test_atime_is_ignored
 '
 
-test_expect_success '--ignore-date with --committer-date-is-author-date works' '
+test_expect_success '--reset-author-date with --committer-date-is-author-date works' '
 	test_must_fail git rebase -m --committer-date-is-author-date \
-		--ignore-date --onto commit2^^ commit2^ commit3 &&
+		--reset-author-date --onto commit2^^ commit2^ commit3 &&
 	git checkout --theirs foo &&
 	git add foo &&
 	git rebase --continue &&
@@ -155,15 +155,23 @@ test_expect_success '--ignore-date with --committer-date-is-author-date works' '
 	test_atime_is_ignored -2
 '
 
-test_expect_success '--ignore-date --committer-date-is-author-date works when forking merge' '
+test_expect_success '--reset-author-date --committer-date-is-author-date works when forking merge' '
 	GIT_SEQUENCE_EDITOR="echo \"merge -C $(git rev-parse HEAD) commit3\">" \
 		PATH="./test-bin:$PATH" git rebase -i --strategy=test \
-				--ignore-date --committer-date-is-author-date \
-				side side &&
+				--reset-author-date \
+				--committer-date-is-author-date side side &&
 	test_ctime_is_atime -1 &&
 	test_atime_is_ignored -1
  '
 
+test_expect_success '--ignore-date is an alias for --reset-author-date' '
+	git commit --amend --date="$GIT_AUTHOR_DATE" &&
+	git rebase --apply --ignore-date HEAD^ &&
+	git commit --allow-empty -m empty --date="$GIT_AUTHOR_DATE" &&
+	git rebase -m --ignore-date HEAD^ &&
+	test_atime_is_ignored -2
+'
+
 # This must be the last test in this file
 test_expect_success '$EDITOR and friends are unchanged' '
 	test_editor_unchanged