[PATCH v2 2/3] parse-options: refactor flags for usage_with_options_internal

["D. Ben Knoble" <ben.knoble+github@gmail.com>]

When reading or editing calls to usage_with_options_internal, it is
difficult to tell what trailing "0, 0", "0, 1", "1, 0" arguments mean
(NB there is never a "1, 1" case).

Give the flags readable names to improve call-sites without changing any
behavior.

Signed-off-by: D. Ben Knoble <ben.knoble+github@gmail.com>
---

I went with a slightly more verbose approach here: Junio argued that the "0"
case is common so deserves to be short, but it's still hard IMO to tell what "0"
represents when reading only the function calls (say, in a patch with minimal
context).

Unfortunately, the deep rightward indent is also a bit challenging on my eyes :/

 parse-options.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/parse-options.c b/parse-options.c
index 5224203ffe..169d76fb65 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -953,10 +953,16 @@ static void free_preprocessed_options(struct option *options)
 	free(options);
 }
 
+#define USAGE_NORMAL 0
+#define USAGE_FULL 1
+#define USAGE_TO_STDOUT 0
+#define USAGE_TO_STDERR 1
+
 static enum parse_opt_result usage_with_options_internal(struct parse_opt_ctx_t *,
 							 const char * const *,
 							 const struct option *,
-							 int, int);
+							 int full_usage,
+							 int usage_to_stderr);
 
 enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 					 const struct option *options,
@@ -1088,7 +1094,8 @@ enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 		}
 
 		if (internal_help && !strcmp(arg + 2, "help-all"))
-			return usage_with_options_internal(ctx, usagestr, options, 1, 0);
+			return usage_with_options_internal(ctx, usagestr, options,
+							   USAGE_FULL, USAGE_TO_STDOUT);
 		if (internal_help && !strcmp(arg + 2, "help"))
 			goto show_usage;
 		switch (parse_long_opt(ctx, arg + 2, options)) {
@@ -1129,7 +1136,8 @@ enum parse_opt_result parse_options_step(struct parse_opt_ctx_t *ctx,
 	return PARSE_OPT_DONE;
 
  show_usage:
-	return usage_with_options_internal(ctx, usagestr, options, 0, 0);
+	return usage_with_options_internal(ctx, usagestr, options,
+					   USAGE_NORMAL, USAGE_TO_STDOUT);
 }
 
 int parse_options_end(struct parse_opt_ctx_t *ctx)
@@ -1444,7 +1452,8 @@ static enum parse_opt_result usage_with_options_internal(struct parse_opt_ctx_t
 void NORETURN usage_with_options(const char * const *usagestr,
 			const struct option *opts)
 {
-	usage_with_options_internal(NULL, usagestr, opts, 0, 1);
+	usage_with_options_internal(NULL, usagestr, opts,
+				    USAGE_NORMAL, USAGE_TO_STDERR);
 	exit(129);
 }
 
@@ -1453,7 +1462,8 @@ void show_usage_with_options_if_asked(int ac, const char **av,
 				      const struct option *opts)
 {
 	if (ac == 2 && !strcmp(av[1], "-h")) {
-		usage_with_options_internal(NULL, usagestr, opts, 0, 0);
+		usage_with_options_internal(NULL, usagestr, opts,
+					    USAGE_NORMAL, USAGE_TO_STDOUT);
 		exit(129);
 	}
 }
-- 
2.48.1