[PATCH v3 6/8] fetch: move display format parsing into main function

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Parsing the display format happens inside of `display_state_init()`. As
we only need to check for a simple config entry, this is a natural
location to put this code as it means that display-state logic is neatly
contained in a single location.

We're about to introduce a output format though that is intended to be
parseable by machines, for example inside of a script. In that case it
becomes a bit awkward of an interface if you have to call git-fetch(1)
with the `fetch.output` config key set. We're thus going to introduce a
new `--output-format` switch for git-fetch(1) so that the output format
can be configured more directly.

This means we'll have to hook parsing of the display format into the
command line options parser. Having the code to determine the actual
output format scattered across two different sites is hard to reason
about though.

Refactor the code such that callers are expected to pass the display
format that is to be used into `display_state_init()`. This allows us to
lift up the code into the main function, where we can then hook it into
command line options parser in a follow-up commit.

Signed-off-by: Patrick Steinhardt <ps@xxxxxx>
---
 builtin/fetch.c | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 9e7e45344d..e15d43dc1e 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -788,14 +788,13 @@ static int refcol_width(const struct ref *ref, int compact_format)
 }
 
 static void display_state_init(struct display_state *display_state, struct ref *ref_map,
-			       const char *raw_url)
+			       const char *raw_url, enum display_format format)
 {
-	const char *format = "full";
 	int i;
 
 	memset(display_state, 0, sizeof(*display_state));
-
 	strbuf_init(&display_state->buf, 0);
+	display_state->format = format;
 
 	if (raw_url)
 		display_state->url = transport_anonymize_url(raw_url);
@@ -812,15 +811,6 @@ static void display_state_init(struct display_state *display_state, struct ref *
 	if (verbosity < 0)
 		return;
 
-	git_config_get_string_tmp("fetch.output", &format);
-	if (!strcasecmp(format, "full"))
-		display_state->format = DISPLAY_FORMAT_FULL;
-	else if (!strcasecmp(format, "compact"))
-		display_state->format = DISPLAY_FORMAT_COMPACT;
-	else
-		die(_("invalid value for '%s': '%s'"),
-		    "fetch.output", format);
-
 	switch (display_state->format) {
 	case DISPLAY_FORMAT_FULL:
 	case DISPLAY_FORMAT_COMPACT: {
@@ -1614,7 +1604,8 @@ static int backfill_tags(struct display_state *display_state,
 }
 
 static int do_fetch(struct transport *transport,
-		    struct refspec *rs)
+		    struct refspec *rs,
+		    enum display_format display_format)
 {
 	struct ref_transaction *transaction = NULL;
 	struct ref *ref_map = NULL;
@@ -1700,7 +1691,7 @@ static int do_fetch(struct transport *transport,
 	if (retcode)
 		goto cleanup;
 
-	display_state_init(&display_state, ref_map, transport->url);
+	display_state_init(&display_state, ref_map, transport->url, display_format);
 
 	if (atomic_fetch) {
 		transaction = ref_transaction_begin(&err);
@@ -2078,7 +2069,8 @@ static inline void fetch_one_setup_partial(struct remote *remote)
 }
 
 static int fetch_one(struct remote *remote, int argc, const char **argv,
-		     int prune_tags_ok, int use_stdin_refspecs)
+		     int prune_tags_ok, int use_stdin_refspecs,
+		     enum display_format display_format)
 {
 	struct refspec rs = REFSPEC_INIT_FETCH;
 	int i;
@@ -2145,7 +2137,7 @@ static int fetch_one(struct remote *remote, int argc, const char **argv,
 	sigchain_push_common(unlock_pack_on_signal);
 	atexit(unlock_pack_atexit);
 	sigchain_push(SIGPIPE, SIG_IGN);
-	exit_code = do_fetch(gtransport, &rs);
+	exit_code = do_fetch(gtransport, &rs, display_format);
 	sigchain_pop(SIGPIPE);
 	refspec_clear(&rs);
 	transport_disconnect(gtransport);
@@ -2157,6 +2149,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	const char *bundle_uri;
+	enum display_format display_format = DISPLAY_FORMAT_UNKNOWN;
 	struct string_list list = STRING_LIST_INIT_DUP;
 	struct remote *remote = NULL;
 	int result = 0;
@@ -2183,6 +2176,19 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix,
 			     builtin_fetch_options, builtin_fetch_usage, 0);
 
+	if (display_format == DISPLAY_FORMAT_UNKNOWN) {
+		const char *format = "full";
+
+		git_config_get_string_tmp("fetch.output", &format);
+		if (!strcasecmp(format, "full"))
+			display_format = DISPLAY_FORMAT_FULL;
+		else if (!strcasecmp(format, "compact"))
+			display_format = DISPLAY_FORMAT_COMPACT;
+		else
+			die(_("invalid value for '%s': '%s'"),
+			    "fetch.output", format);
+	}
+
 	if (recurse_submodules_cli != RECURSE_SUBMODULES_DEFAULT)
 		recurse_submodules = recurse_submodules_cli;
 
@@ -2311,7 +2317,8 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	} else if (remote) {
 		if (filter_options.choice || has_promisor_remote())
 			fetch_one_setup_partial(remote);
-		result = fetch_one(remote, argc, argv, prune_tags_ok, stdin_refspecs);
+		result = fetch_one(remote, argc, argv, prune_tags_ok, stdin_refspecs,
+				   display_format);
 	} else {
 		int max_children = max_jobs;
 
-- 
2.40.1

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