builtin/pack-refs: factor out core logic into a shared library

The implementation of `git pack-refs` is monolithic within
`cmd_pack_refs()`, making it impossible to share its logic with other
commands. To enable code reuse for the upcoming `git refs optimize`
subcommand, refactor the core logic into a shared helper function.

Split the original `builtin/pack-refs.c` file into two parts:

- A new shared library file, `pack-refs.c`, which contains the
  core option parsing and packing logic in a new `pack_refs_core()`
  helper function.

- The original `builtin/pack-refs.c`, which is now a thin wrapper
  responsible only for defining the `git pack-refs` command and
  calling the shared helper.

A new `pack-refs.h` header is also introduced to define the public
interface for this shared logic.

Mentored-by: Patrick Steinhardt <ps@pks.im>
Mentored-by: shejialuo <shejialuo@gmail.com>
Signed-off-by: Meet Soni <meetsoni3017@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 49 deletions

diff --git a/builtin/pack-refs.c b/builtin/pack-refs.c
index dfcf664524..3446b84cda 100644
--- a/builtin/pack-refs.c
+++ b/builtin/pack-refs.c
@@ -1,60 +1,16 @@
 #include "builtin.h"
-#include "config.h"
-#include "environment.h"
 #include "gettext.h"
-#include "parse-options.h"
-#include "refs.h"
-#include "revision.h"
-
-static char const * const pack_refs_usage[] = {
-	N_("git pack-refs [--all] [--no-prune] [--auto] [--include <pattern>] [--exclude <pattern>]"),
-	NULL
-};
+#include "pack-refs.h"
 
 int cmd_pack_refs(int argc,
 		  const char **argv,
 		  const char *prefix,
 		  struct repository *repo)
 {
-	struct ref_exclusions excludes = REF_EXCLUSIONS_INIT;
-	struct string_list included_refs = STRING_LIST_INIT_NODUP;
-	struct pack_refs_opts pack_refs_opts = {
-		.exclusions = &excludes,
-		.includes = &included_refs,
-		.flags = PACK_REFS_PRUNE,
-	};
-	struct string_list option_excluded_refs = STRING_LIST_INIT_NODUP;
-	struct string_list_item *item;
-	int pack_all = 0;
-	int ret;
-
-	struct option opts[] = {
-		OPT_BOOL(0, "all",   &pack_all, N_("pack everything")),
-		OPT_BIT(0, "prune", &pack_refs_opts.flags, N_("prune loose refs (default)"), PACK_REFS_PRUNE),
-		OPT_BIT(0, "auto", &pack_refs_opts.flags, N_("auto-pack refs as needed"), PACK_REFS_AUTO),
-		OPT_STRING_LIST(0, "include", pack_refs_opts.includes, N_("pattern"),
-			N_("references to include")),
-		OPT_STRING_LIST(0, "exclude", &option_excluded_refs, N_("pattern"),
-			N_("references to exclude")),
-		OPT_END(),
+	static char const * const pack_refs_usage[] = {
+		N_("git pack-refs " PACK_REFS_OPTS),
+		NULL
 	};
-	repo_config(repo, git_default_config, NULL);
-	if (parse_options(argc, argv, prefix, opts, pack_refs_usage, 0))
-		usage_with_options(pack_refs_usage, opts);
-
-	for_each_string_list_item(item, &option_excluded_refs)
-		add_ref_exclusion(pack_refs_opts.exclusions, item->string);
-
-	if (pack_all)
-		string_list_append(pack_refs_opts.includes, "*");
-
-	if (!pack_refs_opts.includes->nr)
-		string_list_append(pack_refs_opts.includes, "refs/tags/*");
-
-	ret = refs_optimize(get_main_ref_store(repo), &pack_refs_opts);
 
-	clear_ref_exclusions(&excludes);
-	string_list_clear(&included_refs, 0);
-	string_list_clear(&option_excluded_refs, 0);
-	return ret;
+	return pack_refs_core(argc, argv, prefix, repo, pack_refs_usage);
 }