[PATCH 6/6] apply, ls-files: simplify "-z" parsing

[Jeff King <peff@peff.net>]

As a short option, we cannot handle negation. Thus a
callback handling "unset" is overkill, and we can just use
OPT_SET_INT instead to handle setting the option.

Signed-off-by: Jeff King <peff@peff.net>
---
I left this one for last, because it's the most questionable. Unlike the
previous "-z" case, we're setting the actual character, so the logic is
inverted: turning on the option sets it to 0, and turning it off restore
'\n'.

This means OPT_SET_INT would do the wrong thing for the "unset" case, as
it would put a "0" into the option. You can't trigger that now, but if
somebody were to add a long option (e.g., "--nul"), then "--no-nul"
would do the wrong thing.

I'm on the fence on whether the simplification is worth it, or if we
should leave the callbacks as future-proofing.

 builtin/apply.c    | 15 ++-------------
 builtin/ls-files.c | 13 ++-----------
 2 files changed, 4 insertions(+), 24 deletions(-)

diff --git a/builtin/apply.c b/builtin/apply.c
index deb1364..565f3fd 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -4464,16 +4464,6 @@ static int option_parse_p(const struct option *opt,
 	return 0;
 }
 
-static int option_parse_z(const struct option *opt,
-			  const char *arg, int unset)
-{
-	if (unset)
-		line_termination = '\n';
-	else
-		line_termination = 0;
-	return 0;
-}
-
 static int option_parse_space_change(const struct option *opt,
 			  const char *arg, int unset)
 {
@@ -4546,9 +4536,8 @@ int cmd_apply(int argc, const char **argv, const char *prefix_)
 			 N_( "attempt three-way merge if a patch does not apply")),
 		OPT_FILENAME(0, "build-fake-ancestor", &fake_ancestor,
 			N_("build a temporary index based on embedded index information")),
-		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
-			N_("paths are separated with NUL character"),
-			PARSE_OPT_NOARG, option_parse_z },
+		OPT_SET_INT('z', NULL, &line_termination,
+			N_("paths are separated with NUL character"), '\0'),
 		OPT_INTEGER('C', NULL, &p_context,
 				N_("ensure at least <n> lines of context match")),
 		{ OPTION_CALLBACK, 0, "whitespace", &whitespace_option, N_("action"),
diff --git a/builtin/ls-files.c b/builtin/ls-files.c
index b6a7cb0..59bad9b 100644
--- a/builtin/ls-files.c
+++ b/builtin/ls-files.c
@@ -359,14 +359,6 @@ static const char * const ls_files_usage[] = {
 	NULL
 };
 
-static int option_parse_z(const struct option *opt,
-			  const char *arg, int unset)
-{
-	line_terminator = unset ? '\n' : '\0';
-
-	return 0;
-}
-
 static int option_parse_exclude(const struct option *opt,
 				const char *arg, int unset)
 {
@@ -408,9 +400,8 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
 	struct exclude_list *el;
 	struct string_list exclude_list = STRING_LIST_INIT_NODUP;
 	struct option builtin_ls_files_options[] = {
-		{ OPTION_CALLBACK, 'z', NULL, NULL, NULL,
-			N_("paths are separated with NUL character"),
-			PARSE_OPT_NOARG, option_parse_z },
+		OPT_SET_INT('z', NULL, &line_terminator,
+			N_("paths are separated with NUL character"), '\0'),
 		OPT_BOOL('t', NULL, &show_tag,
 			N_("identify the file status with tags")),
 		OPT_BOOL('v', NULL, &show_valid_bit,
-- 
2.7.0.489.g6faad84