Re: [PATCH 1/4] submodule: implement `module_name` as a builtin helper

> This implements the helper `module_name` in C instead of shell,
> yielding a nice performance boost.
>
> Before this patch, I measured a time (best out of three):
>
>    $ time ./t7400-submodule-basic.sh  >/dev/null
>      real	0m11.066s
>      user	0m3.348s
>      sys	0m8.534s
>
> With this patch applied I measured (also best out of three)
>
>    $ time ./t7400-submodule-basic.sh  >/dev/null
>      real	0m10.063s
>      user	0m3.044s
>      sys	0m7.487s
>
> Signed-off-by: Stefan Beller <sbeller@google.com>
> ---

>   builtin/submodule--helper.c | 23 +++++++++++++++++++++++
>   git-submodule.sh            | 32 +++++++-------------------------
>   submodule.c                 | 18 +++++++++++++-----
>   submodule.h                 |  1 +
>   4 files changed, 44 insertions(+), 30 deletions(-)
>
> diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
> index cb18ddf..3713c4c 100644
> --- a/builtin/submodule--helper.c
> +++ b/builtin/submodule--helper.c
> @@ -5,6 +5,8 @@
>   #include "pathspec.h"
>   #include "dir.h"
>   #include "utf8.h"
> +#include "submodule.h"
> +#include "string-list.h"
>
>   static char *ps_matched;
>   static const struct cache_entry **ce_entries;
> @@ -98,6 +100,24 @@ static int module_list(int argc, const char **argv, const char *prefix)
>   	return 0;
>   }
>
> +static int module_name(int argc, const char **argv, const char *prefix)
> +{
> +	const char *name;
> +
> +	if (argc != 1)
> +		usage("git submodule--helper module_name <path>\n");
> +
> +	gitmodules_config();
> +	name = submodule_name_for_path(argv[0]);
> +
> +	if (name)
> +		printf("%s\n", name);
> +	else
> +		die("No submodule mapping found in .gitmodules for path '%s'", argv[0]);
> +
> +	return 0;
> +}
> +
>   int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
>   {
>   	if (argc < 2)
> @@ -106,6 +126,9 @@ int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
>   	if (!strcmp(argv[1], "module_list"))
>   		return module_list(argc - 1, argv + 1, prefix);
>
> +	if (!strcmp(argv[1], "module_name"))
> +		return module_name(argc - 2, argv + 2, prefix);
> +
>   usage:
>   	usage("git submodule--helper module_list\n");
>   }
> diff --git a/git-submodule.sh b/git-submodule.sh
> index af9ecef..e6ff38d 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -178,24 +178,6 @@ get_submodule_config () {
>   	printf '%s' "${value:-$default}"
>   }
>
> -
> -#
> -# Map submodule path to submodule name
> -#
> -# $1 = path
> -#
> -module_name()
> -{
> -	# Do we have "submodule.<something>.path = $1" defined in .gitmodules file?
> -	sm_path="$1"
> -	re=$(printf '%s\n' "$1" | sed -e 's/[].[^$\\*]/\\&/g')
> -	name=$( git config -f .gitmodules --get-regexp '^submodule\..*\.path$' |
> -		sed -n -e 's|^submodule\.\(.*\)\.path '"$re"'$|\1|p' )
> -	test -z "$name" &&
> -	die "$(eval_gettext "No submodule mapping found in .gitmodules for path '\$sm_path'")"
> -	printf '%s\n' "$name"
> -}
> -
>   #
>   # Clone a submodule
>   #
> @@ -498,7 +480,7 @@ cmd_foreach()
>   		then
>   			displaypath=$(relative_path "$sm_path")
>   			say "$(eval_gettext "Entering '\$prefix\$displaypath'")"
> -			name=$(module_name "$sm_path")
> +			name=$(git submodule--helper module_name "$sm_path")
>   			(
>   				prefix="$prefix$sm_path/"
>   				clear_local_git_env
> @@ -554,7 +536,7 @@ cmd_init()
>   	while read mode sha1 stage sm_path
>   	do
>   		die_if_unmatched "$mode"
> -		name=$(module_name "$sm_path") || exit
> +		name=$(git submodule--helper module_name "$sm_path") || exit
>
>   		displaypath=$(relative_path "$sm_path")
>
> @@ -636,7 +618,7 @@ cmd_deinit()
>   	while read mode sha1 stage sm_path
>   	do
>   		die_if_unmatched "$mode"
> -		name=$(module_name "$sm_path") || exit
> +		name=$(git submodule--helper module_name "$sm_path") || exit
>
>   		displaypath=$(relative_path "$sm_path")
>
> @@ -758,7 +740,7 @@ cmd_update()
>   			echo >&2 "Skipping unmerged submodule $prefix$sm_path"
>   			continue
>   		fi
> -		name=$(module_name "$sm_path") || exit
> +		name=$(git submodule--helper module_name "$sm_path") || exit
>   		url=$(git config submodule."$name".url)
>   		branch=$(get_submodule_config "$name" branch master)
>   		if ! test -z "$update"
> @@ -1022,7 +1004,7 @@ cmd_summary() {
>   			# Respect the ignore setting for --for-status.
>   			if test -n "$for_status"
>   			then
> -				name=$(module_name "$sm_path")
> +				name=$(git submodule--helper module_name "$sm_path")
>   				ignore_config=$(get_submodule_config "$name" ignore none)
>   				test $status != A && test $ignore_config = all && continue
>   			fi
> @@ -1184,7 +1166,7 @@ cmd_status()
>   	while read mode sha1 stage sm_path
>   	do
>   		die_if_unmatched "$mode"
> -		name=$(module_name "$sm_path") || exit
> +		name=$(git submodule--helper module_name "$sm_path") || exit
>   		url=$(git config submodule."$name".url)
>   		displaypath=$(relative_path "$prefix$sm_path")
>   		if test "$stage" = U
> @@ -1261,7 +1243,7 @@ cmd_sync()
>   	while read mode sha1 stage sm_path
>   	do
>   		die_if_unmatched "$mode"
> -		name=$(module_name "$sm_path")
> +		name=$(git submodule--helper module_name "$sm_path")
>   		url=$(git config -f .gitmodules --get submodule."$name".url)
>
>   		# Possibly a url relative to parent
> diff --git a/submodule.c b/submodule.c
> index 15e90d1..872967f 100644
> --- a/submodule.c
> +++ b/submodule.c
> @@ -686,6 +686,16 @@ static void calculate_changed_submodule_paths(void)
>   	initialized_fetch_ref_tips = 0;
>   }
>
> +const char* submodule_name_for_path(const char* path)
> +{
> +	struct string_list_item *item;
> +	item = unsorted_string_list_lookup(&config_name_for_path, path);
> +	if (item)
> +		return item->util;
> +	else
> +		return NULL;
> +}
> +
>   int fetch_populated_submodules(const struct argv_array *options,
>   			       const char *prefix, int command_line_option,
>   			       int quiet)
> @@ -693,7 +703,7 @@ int fetch_populated_submodules(const struct argv_array *options,
>   	int i, result = 0;
>   	struct child_process cp = CHILD_PROCESS_INIT;
>   	struct argv_array argv = ARGV_ARRAY_INIT;
> -	struct string_list_item *name_for_path;
> +	const char *name_for_path;
>   	const char *work_tree = get_git_work_tree();
>   	if (!work_tree)
>   		goto out;
> @@ -723,10 +733,8 @@ int fetch_populated_submodules(const struct argv_array *options,
>   		if (!S_ISGITLINK(ce->ce_mode))
>   			continue;
>
> -		name = ce->name;
> -		name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
> -		if (name_for_path)
> -			name = name_for_path->util;
> +		name_for_path = submodule_name_for_path(ce->name);
> +		name =  name_for_path ? name_for_path : ce->name;
>
>   		default_argv = "yes";
>   		if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
> diff --git a/submodule.h b/submodule.h
> index 7beec48..e3dd854 100644
> --- a/submodule.h
> +++ b/submodule.h
> @@ -41,5 +41,6 @@ int find_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_nam
>   		struct string_list *needs_pushing);
>   int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name);
>   void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir);
> +const char* submodule_name_for_path(const char* path);
>
>   #endif
>