[PATCH v4 6/8] sequencer: reencode squashing commit's message

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On fixup/squash-ing rebase, git will create new commit in
i18n.commitencoding, reencode the commit message to that said encode.

Signed-off-by: Doan Tran Cong Danh <congdanhqx@xxxxxxxxx>
---
 sequencer.c            |  8 +++++---
 t/t3900-i18n-commit.sh | 14 +++++++++++++-
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index a19954f2bf..833a928929 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1576,6 +1576,7 @@ static int update_squash_messages(struct repository *r,
 	struct strbuf buf = STRBUF_INIT;
 	int res;
 	const char *message, *body;
+	const char *encoding = get_commit_output_encoding();
 
 	if (opts->current_fixup_count > 0) {
 		struct strbuf header = STRBUF_INIT;
@@ -1602,7 +1603,7 @@ static int update_squash_messages(struct repository *r,
 			return error(_("need a HEAD to fixup"));
 		if (!(head_commit = lookup_commit_reference(r, &head)))
 			return error(_("could not read HEAD"));
-		if (!(head_message = get_commit_buffer(head_commit, NULL)))
+		if (!(head_message = logmsg_reencode(head_commit, NULL, encoding)))
 			return error(_("could not read HEAD's commit message"));
 
 		find_commit_subject(head_message, &body);
@@ -1623,7 +1624,7 @@ static int update_squash_messages(struct repository *r,
 		unuse_commit_buffer(head_commit, head_message);
 	}
 
-	if (!(message = get_commit_buffer(commit, NULL)))
+	if (!(message = logmsg_reencode(commit, NULL, encoding)))
 		return error(_("could not read commit message of %s"),
 			     oid_to_hex(&commit->object.oid));
 	find_commit_subject(message, &body);
@@ -4154,9 +4155,10 @@ static int commit_staged_changes(struct repository *r,
 				 */
 				struct commit *commit;
 				const char *path = rebase_path_squash_msg();
+				const char *encoding = get_commit_output_encoding();
 
 				if (parse_head(r, &commit) ||
-				    !(p = get_commit_buffer(commit, NULL)) ||
+				    !(p = logmsg_reencode(commit, NULL, encoding)) ||
 				    write_message(p, strlen(p), path, 0)) {
 					unuse_commit_buffer(commit, p);
 					return error(_("could not write file: "
diff --git a/t/t3900-i18n-commit.sh b/t/t3900-i18n-commit.sh
index e8ce5323ee..521d7bb927 100755
--- a/t/t3900-i18n-commit.sh
+++ b/t/t3900-i18n-commit.sh
@@ -209,6 +209,13 @@ test_commit_autosquash_multi_encoding () {
 	old=$2
 	new=$3
 	msg=$4
+	squash_msg=
+	if test $flag = squash; then
+		squash_msg='
+		subject="squash! $(head -1 expect)" &&
+		printf "\n%s\n" "$subject" >> expect &&
+		'
+	fi
 	test_expect_success "commit --$flag into $old from $new" '
 		git checkout -b '$flag-$old-$new' C0 &&
 		git config i18n.commitencoding '$old' &&
@@ -224,7 +231,12 @@ test_commit_autosquash_multi_encoding () {
 		git commit -a --'$flag' HEAD^ &&
 		git rebase --autosquash -i HEAD^^^ &&
 		git rev-list HEAD >actual &&
-		test_line_count = 3 actual
+		test_line_count = 3 actual &&
+		iconv -f '$old' -t utf-8 "$TEST_DIRECTORY/t3900/'$msg'" >expect &&
+		'"$squash_msg"'
+		git cat-file commit HEAD^ >raw &&
+		(sed "1,/^$/d" raw | iconv -f '$new' -t utf-8) >actual &&
+		test_cmp expect actual
 	'
 }
 
-- 
2.24.0.8.g36796e2b67




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