[PATCH V3 1/2] fetch --prune: Always print header url

[Tom Miller <jackerran@gmail.com>]

If "fetch --prune" is run with no new refs to fetch, but it has refs
to prune. Then, the header url is not printed as it would if there were
new refs to fetch.

Output before this patch:

	$ git fetch --prune remote-with-no-new-refs
	 x [deleted]         (none)     -> origin/world

Output after this patch:

	$ git fetch --prune remote-with-no-new-refs
	From https://github.com/git/git
	 x [deleted]         (none)     -> origin/test

Signed-off-by: Tom Miller <jackerran@gmail.com>
---

I decided it is not worth writing a function to format the header url
that is printed by fetch. Instead, I will duplicate the formatting logic
for now because I plan on following up this patch set with another patch
to stop striping the trailing "/" and ".git" from the url. When that
patch is finished it will remove the majority of the duplicated logic.

 builtin/fetch.c  | 32 +++++++++++++++++++++++++++-----
 t/t5510-fetch.sh | 12 ++++++++++++
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/builtin/fetch.c b/builtin/fetch.c
index 1e7d617..1b81cf9 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -44,6 +44,7 @@ static struct transport *gtransport;
 static struct transport *gsecondary;
 static const char *submodule_prefix = "";
 static const char *recurse_submodules_default;
+static int shown_url = 0;
 
 static int option_parse_recurse_submodules(const struct option *opt,
 				   const char *arg, int unset)
@@ -535,7 +536,7 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 {
 	FILE *fp;
 	struct commit *commit;
-	int url_len, i, shown_url = 0, rc = 0;
+	int url_len, i, rc = 0;
 	struct strbuf note = STRBUF_INIT;
 	const char *what, *kind;
 	struct ref *rm;
@@ -708,17 +709,36 @@ static int fetch_refs(struct transport *transport, struct ref *ref_map)
 	return ret;
 }
 
-static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
+static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
+		const char *raw_url)
 {
-	int result = 0;
+	int url_len, i, result = 0;
 	struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
+	char *url;
 	const char *dangling_msg = dry_run
 		? _("   (%s will become dangling)")
 		: _("   (%s has become dangling)");
 
+	if (raw_url)
+		url = transport_anonymize_url(raw_url);
+	else
+		url = xstrdup("foreign");
+
+	url_len = strlen(url);
+	for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
+		;
+
+	url_len = i + 1;
+	if (4 < i && !strncmp(".git", url + i - 3, 4))
+		url_len = i - 3;
+
 	for (ref = stale_refs; ref; ref = ref->next) {
 		if (!dry_run)
 			result |= delete_ref(ref->name, NULL, 0);
+		if (verbosity >= 0 && !shown_url) {
+			fprintf(stderr, _("From %.*s\n"), url_len, url);
+			shown_url = 1;
+		}
 		if (verbosity >= 0) {
 			fprintf(stderr, " x %-*s %-*s -> %s\n",
 				TRANSPORT_SUMMARY(_("[deleted]")),
@@ -726,6 +746,7 @@ static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
 			warn_dangling_symref(stderr, dangling_msg, ref->name);
 		}
 	}
+	free(url);
 	free_refs(stale_refs);
 	return result;
 }
@@ -854,11 +875,12 @@ static int do_fetch(struct transport *transport,
 		 * don't care whether --tags was specified.
 		 */
 		if (ref_count) {
-			prune_refs(refs, ref_count, ref_map);
+			prune_refs(refs, ref_count, ref_map, transport->url);
 		} else {
 			prune_refs(transport->remote->fetch,
 				   transport->remote->fetch_refspec_nr,
-				   ref_map);
+				   ref_map,
+				   transport->url);
 		}
 	}
 	free_refs(ref_map);
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index 5d4581d..87e896d 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -614,4 +614,16 @@ test_expect_success 'all boundary commits are excluded' '
 	test_bundle_object_count .git/objects/pack/pack-${pack##pack	}.pack 3
 '
 
+test_expect_success 'fetch --prune prints the remotes url' '
+	git branch goodbye &&
+	git clone . only-prunes &&
+	git branch -D goodbye &&
+	(
+		cd only-prunes &&
+		git fetch --prune origin 2>&1 | head -n1 >../actual
+	) &&
+	echo "From ${D}/." >expect &&
+	test_cmp expect actual
+'
+
 test_done
-- 
1.8.5.2.231.g4834e63.dirty