[PATCH 05/25] list-files: command skeleton

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list-files is supposed to be the user friendly version of ls-files, or
an alternative to git-status. Nothing fancy in this patch yet.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
 .gitignore                     |   1 +
 Makefile                       |   1 +
 builtin.h                      |   1 +
 builtin/list-files.c (new)     | 107 +++++++++++++++++++++++++++++++++++++++++
 git.c                          |   1 +
 t/t7013-list-files.sh (new +x) |  35 ++++++++++++++
 6 files changed, 146 insertions(+)
 create mode 100644 builtin/list-files.c
 create mode 100755 t/t7013-list-files.sh

diff --git a/.gitignore b/.gitignore
index a052419..0534225 100644
--- a/.gitignore
+++ b/.gitignore
@@ -77,6 +77,7 @@
 /git-interpret-trailers
 /git-instaweb
 /git-log
+/git-list-files
 /git-ls-files
 /git-ls-remote
 /git-ls-tree
diff --git a/Makefile b/Makefile
index 459121d..17f52b2 100644
--- a/Makefile
+++ b/Makefile
@@ -832,6 +832,7 @@ BUILTIN_OBJS += builtin/index-pack.o
 BUILTIN_OBJS += builtin/init-db.o
 BUILTIN_OBJS += builtin/interpret-trailers.o
 BUILTIN_OBJS += builtin/log.o
+BUILTIN_OBJS += builtin/list-files.o
 BUILTIN_OBJS += builtin/ls-files.o
 BUILTIN_OBJS += builtin/ls-remote.o
 BUILTIN_OBJS += builtin/ls-tree.o
diff --git a/builtin.h b/builtin.h
index b87df70..afc29e7 100644
--- a/builtin.h
+++ b/builtin.h
@@ -76,6 +76,7 @@ extern int cmd_init_db(int argc, const char **argv, const char *prefix);
 extern int cmd_interpret_trailers(int argc, const char **argv, const char *prefix);
 extern int cmd_log(int argc, const char **argv, const char *prefix);
 extern int cmd_log_reflog(int argc, const char **argv, const char *prefix);
+extern int cmd_list_files(int argc, const char **argv, const char *prefix);
 extern int cmd_ls_files(int argc, const char **argv, const char *prefix);
 extern int cmd_ls_tree(int argc, const char **argv, const char *prefix);
 extern int cmd_ls_remote(int argc, const char **argv, const char *prefix);
diff --git a/builtin/list-files.c b/builtin/list-files.c
new file mode 100644
index 0000000..8b74d79
--- /dev/null
+++ b/builtin/list-files.c
@@ -0,0 +1,107 @@
+#include "cache.h"
+#include "builtin.h"
+#include "parse-options.h"
+#include "pathspec.h"
+#include "dir.h"
+
+enum item_type {
+	FROM_INDEX
+};
+
+struct item {
+	enum item_type type;
+	const char *path;
+	const struct cache_entry *ce;
+};
+
+struct item_list {
+	struct item *items;
+	int nr, alloc;
+};
+
+static struct pathspec pathspec;
+static const char *prefix;
+static int prefix_length;
+
+static const char * const ls_usage[] = {
+	N_("git list-files [options] [<pathspec>...]"),
+	NULL
+};
+
+struct option ls_options[] = {
+	OPT_END()
+};
+
+static void populate_cached_entries(struct item_list *result,
+				    const struct index_state *istate)
+{
+	int i;
+
+	for (i = 0; i < istate->cache_nr; i++) {
+		const struct cache_entry *ce = istate->cache[i];
+		struct item *item;
+
+		if (!match_pathspec(&pathspec, ce->name, ce_namelen(ce),
+				    0, NULL,
+				    S_ISDIR(ce->ce_mode) ||
+				    S_ISGITLINK(ce->ce_mode)))
+			continue;
+
+		ALLOC_GROW(result->items, result->nr + 1, result->alloc);
+		item = result->items + result->nr++;
+		item->type = FROM_INDEX;
+		item->path = ce->name;
+		item->ce = ce;
+	}
+}
+
+static void display(const struct item_list *result)
+{
+	int i;
+
+	for (i = 0; i < result->nr; i++) {
+		const struct item *item = result->items + i;
+
+		printf("%s\n", item->path);
+	}
+}
+
+static int ls_config(const char *var, const char *value, void *cb)
+{
+	return git_default_config(var, value, cb);
+}
+
+int cmd_list_files(int argc, const char **argv, const char *cmd_prefix)
+{
+	struct item_list result;
+
+	if (argc == 2 && !strcmp(argv[1], "-h"))
+		usage_with_options(ls_usage, ls_options);
+
+	prefix = cmd_prefix;
+	if (prefix)
+		prefix_length = strlen(prefix);
+
+	if (read_cache() < 0)
+		die(_("index file corrupt"));
+
+	git_config(ls_config, NULL);
+
+	argc = parse_options(argc, argv, prefix, ls_options, ls_usage, 0);
+
+	parse_pathspec(&pathspec, 0,
+		       PATHSPEC_PREFER_CWD |
+		       PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,
+		       cmd_prefix, argv);
+	pathspec.max_depth = 0;
+	pathspec.recursive = 1;
+
+	refresh_index(&the_index, REFRESH_QUIET | REFRESH_UNMERGED,
+		      &pathspec, NULL, NULL);
+
+	memset(&result, 0, sizeof(result));
+	populate_cached_entries(&result, &the_index);
+	display(&result);
+	/* free-ing result seems unnecessary */
+	return 0;
+}
diff --git a/git.c b/git.c
index 18fbf79..ae7fe77 100644
--- a/git.c
+++ b/git.c
@@ -418,6 +418,7 @@ static struct cmd_struct commands[] = {
 	{ "init", cmd_init_db, NO_SETUP },
 	{ "init-db", cmd_init_db, NO_SETUP },
 	{ "interpret-trailers", cmd_interpret_trailers, RUN_SETUP },
+	{ "list-files", cmd_list_files, RUN_SETUP | USE_PAGER | NEED_WORK_TREE },
 	{ "log", cmd_log, RUN_SETUP },
 	{ "ls-files", cmd_ls_files, RUN_SETUP },
 	{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
diff --git a/t/t7013-list-files.sh b/t/t7013-list-files.sh
new file mode 100755
index 0000000..f43776e
--- /dev/null
+++ b/t/t7013-list-files.sh
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+test_description='list-files'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	mkdir sa sa/sb sc &&
+	touch a b c sa/a sa/sb/b sc/c &&
+	git add .
+'
+
+test_expect_success 'list-files from index' '
+	git list-files >actual &&
+	cat >expect <<-\EOF &&
+	a
+	b
+	c
+	sa/a
+	sa/sb/b
+	sc/c
+	EOF
+	test_cmp expect actual
+'
+
+test_expect_success 'list-files selectively from index' '
+	git list-files "*a" >actual &&
+	cat >expect <<-\EOF &&
+	a
+	sa/a
+	EOF
+	test_cmp expect actual
+'
+
+test_done
-- 
2.3.0.rc1.137.g477eb31

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