From: Olivier Marin <dkr@freesurf.fr>

This command is really too quiet which make it unconfortable to use.

Also implement a --dry-run option, in place of the original -n one, to
list stale tracking branches that will be pruned, but do not actually
prune them.

Add a test case for --dry-run.

Signed-off-by: Olivier Marin <dkr@freesurf.fr>
---
 Documentation/git-remote.txt |    7 +++----
 builtin-remote.c             |   20 ++++++++++++++++----
 t/t5505-remote.sh            |   18 ++++++++++++++++++
 3 files changed, 37 insertions(+), 8 deletions(-)

diff --git a/Documentation/git-remote.txt b/Documentation/git-remote.txt
index 7bd024e..345943a 100644
--- a/Documentation/git-remote.txt
+++ b/Documentation/git-remote.txt
@@ -13,7 +13,7 @@ SYNOPSIS
 'git-remote' add [-t <branch>] [-m <master>] [-f] [--mirror] <name> <url>
 'git-remote' rm <name>
 'git-remote' show [-n] <name>
-'git-remote' prune <name>
+'git-remote' prune [-n | --dry-run] <name>
 'git-remote' update [group]
 
 DESCRIPTION
@@ -80,9 +80,8 @@ These stale branches have already been removed from the remote repository
 referenced by <name>, but are still locally available in
 "remotes/<name>".
 +
-With `-n` option, the remote heads are not confirmed first with `git
-ls-remote <name>`; cached information is used instead.  Use with
-caution.
+With `--dry-run` option, report what branches will be pruned, but do no
+actually prune them.
 
 'update'::
 
diff --git a/builtin-remote.c b/builtin-remote.c
index 745a4ee..851bdde 100644
--- a/builtin-remote.c
+++ b/builtin-remote.c
@@ -521,12 +521,14 @@ static int show(int argc, const char **argv)
 	return result;
 }
 
+#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
+
 static int prune(int argc, const char **argv)
 {
-	int no_query = 0, result = 0;
+	int dry_run = 0, result = 0;
 	struct option options[] = {
 		OPT_GROUP("prune specific options"),
-		OPT_BOOLEAN('n', NULL, &no_query, "do not query remotes"),
+		OPT__DRY_RUN(&dry_run),
 		OPT_END()
 	};
 	struct ref_states states;
@@ -540,11 +542,21 @@ static int prune(int argc, const char **argv)
 	for (; argc; argc--, argv++) {
 		int i;
 
-		get_remote_ref_states(*argv, &states, !no_query);
+		get_remote_ref_states(*argv, &states, 1);
+
+		printf("Pruning %s\n", *argv);
+		if (states.stale.nr)
+			printf("From: %s\n", states.remote->url[0]);
 
 		for (i = 0; i < states.stale.nr; i++) {
 			const char *refname = states.stale.items[i].util;
-			result |= delete_ref(refname, NULL);
+
+			if (!dry_run)
+				result |= delete_ref(refname, NULL);
+
+			printf(" * %-*s %s\n", SUMMARY_WIDTH, "[stale branch]",
+				refname + strlen("refs/remotes/")
+				+ strlen(*argv) + 1);
 		}
 
 		/* NEEDSWORK: free remote */
diff --git a/t/t5505-remote.sh b/t/t5505-remote.sh
index c6a7bfb..c27cfad 100755
--- a/t/t5505-remote.sh
+++ b/t/t5505-remote.sh
@@ -165,6 +165,24 @@ test_expect_success 'prune' '
 	 ! git rev-parse refs/remotes/origin/side)
 '
 
+cat > test/expect << EOF
+Pruning origin
+From: $(pwd)/one/.git
+ * [stale branch]    side2
+EOF
+
+test_expect_success 'prune --dry-run' '
+	(cd one &&
+	 git branch -m side2 side) &&
+	(cd test &&
+	 git remote prune --dry-run origin > output &&
+	 git rev-parse refs/remotes/origin/side2 &&
+	 ! git rev-parse refs/remotes/origin/side &&
+	(cd ../one &&
+	 git branch -m side side2) &&
+	 test_cmp expect output)
+'
+
 test_expect_success 'add --mirror && prune' '
 	(mkdir mirror &&
 	 cd mirror &&
-- 
1.5.6.rc2.160.gd660c

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