Make prune also run prune-packed

Both the git-prune manpage and everday.txt say that git-prune should also prune
unpacked objects that are also found in packs, by running git prune-packed.

Junio thought this was "a regression when prune was rewritten as a built-in."

So modify prune to call prune-packed again.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

builtin-prune-packed.c

@@ -4,9 +4,7 @@
 static const char prune_packed_usage[] =
 "git-prune-packed [-n]";
 
-static int dryrun;
-
-static void prune_dir(int i, DIR *dir, char *pathname, int len)
+static void prune_dir(int i, DIR *dir, char *pathname, int len, int dryrun)
 {
 	struct dirent *de;
 	char hex[40];
@@ -31,7 +29,7 @@ static void prune_dir(int i, DIR *dir, char *pathname, int len)
 	rmdir(pathname);
 }
 
-static void prune_packed_objects(void)
+void prune_packed_objects(int dryrun)
 {
 	int i;
 	static char pathname[PATH_MAX];
@@ -50,7 +48,7 @@ static void prune_packed_objects(void)
 		d = opendir(pathname);
 		if (!d)
 			continue;
-		prune_dir(i, d, pathname, len + 3);
+		prune_dir(i, d, pathname, len + 3, dryrun);
 		closedir(d);
 	}
 }
@@ -58,6 +56,7 @@ static void prune_packed_objects(void)
 int cmd_prune_packed(int argc, const char **argv, const char *prefix)
 {
 	int i;
+	int dryrun;
 
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
@@ -73,6 +72,6 @@ int cmd_prune_packed(int argc, const char **argv, const char *prefix)
 		usage(prune_packed_usage);
 	}
 	sync();
-	prune_packed_objects();
+	prune_packed_objects(dryrun);
 	return 0;
 }

builtin-prune.c

@@ -255,5 +255,7 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
 
 	prune_object_dir(get_object_directory());
 
+	sync();
+	prune_packed_objects(show_only);
 	return 0;
 }

builtin.h

@@ -11,6 +11,7 @@ extern int mailinfo(FILE *in, FILE *out, int ks, const char *encoding, const cha
 extern int split_mbox(const char **mbox, const char *dir, int allow_bare, int nr_prec, int skip);
 extern void stripspace(FILE *in, FILE *out);
 extern int write_tree(unsigned char *sha1, int missing_ok, const char *prefix);
+extern void prune_packed_objects(int);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);