[RFC] config-batch: a new builtin for tools querying config

.gitignore

@@ -44,6 +44,7 @@
 /git-commit-graph
 /git-commit-tree
 /git-config
+/git-config-batch
 /git-count-objects
 /git-credential
 /git-credential-cache

Documentation/git-config-batch.adoc

@@ -0,0 +1,24 @@
+git-config-batch(1)
+===================
+
+NAME
+----
+git-config-batch - Get and set options using machine-parseable interface
+
+
+SYNOPSIS
+--------
+[verse]
+'git config-batch' <options>
+
+DESCRIPTION
+-----------
+TODO
+
+SEE ALSO
+--------
+linkgit:git-config[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite

Documentation/meson.build

@@ -29,6 +29,7 @@ manpages = {
   'git-commit-tree.adoc' : 1,
   'git-commit.adoc' : 1,
   'git-config.adoc' : 1,
+  'git-config-batch.adoc' : 1,
   'git-count-objects.adoc' : 1,
   'git-credential-cache--daemon.adoc' : 1,
   'git-credential-cache.adoc' : 1,

Makefile

@@ -1390,6 +1390,7 @@ BUILTIN_OBJS += builtin/commit-graph.o
 BUILTIN_OBJS += builtin/commit-tree.o
 BUILTIN_OBJS += builtin/commit.o
 BUILTIN_OBJS += builtin/config.o
+BUILTIN_OBJS += builtin/config-batch.o
 BUILTIN_OBJS += builtin/count-objects.o
 BUILTIN_OBJS += builtin/credential-cache--daemon.o
 BUILTIN_OBJS += builtin/credential-cache.o

builtin.h

@@ -68,12 +68,18 @@
  *
  * . Add `builtin/foo.o` to `BUILTIN_OBJS` in `Makefile`.
  *
+ * . Add 'builtin/foo.c' to the 'builtin_sources' array in 'meson.build'.
+ *
  * Additionally, if `foo` is a new command, there are 4 more things to do:
  *
  * . Add tests to `t/` directory.
  *
+ * . Add the test script to 'integration_tests' in  't/meson.build'.
+ *
  * . Write documentation in `Documentation/git-foo.adoc`.
  *
+ * . Add 'git-foo.adoc' to the manpages list in 'Documentation/meson.build'.
+ *
  * . Add an entry for `git-foo` to `command-list.txt`.
  *
  * . Add an entry for `/git-foo` to `.gitignore`.
@@ -167,6 +173,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix, struct repositor
 int cmd_commit_graph(int argc, const char **argv, const char *prefix, struct repository *repo);
 int cmd_commit_tree(int argc, const char **argv, const char *prefix, struct repository *repo);
 int cmd_config(int argc, const char **argv, const char *prefix, struct repository *repo);
+int cmd_config_batch(int argc, const char **argv, const char *prefix, struct repository *repo);
 int cmd_count_objects(int argc, const char **argv, const char *prefix, struct repository *repo);
 int cmd_credential(int argc, const char **argv, const char *prefix, struct repository *repo);
 int cmd_credential_cache(int argc, const char **argv, const char *prefix, struct repository *repo);

builtin/config-batch.c

@@ -0,0 +1,30 @@
+#define USE_THE_REPOSITORY_VARIABLE
+#include "builtin.h"
+#include "config.h"
+#include "environment.h"
+#include "parse-options.h"
+
+static const char *const builtin_config_batch_usage[] = {
+	N_("git config-batch <options>"),
+	NULL
+};
+
+int cmd_config_batch(int argc,
+		     const char **argv,
+		     const char *prefix,
+		     struct repository *repo)
+{
+	struct option options[] = {
+		OPT_END(),
+	};
+
+	show_usage_with_options_if_asked(argc, argv,
+					 builtin_config_batch_usage, options);
+
+	argc = parse_options(argc, argv, prefix, options, builtin_config_batch_usage,
+			     0);
+
+	repo_config(repo, git_default_config, NULL);
+
+	return 0;
+}

command-list.txt

@@ -83,6 +83,7 @@ git-commit                              mainporcelain           history
 git-commit-graph                        plumbingmanipulators
 git-commit-tree                         plumbingmanipulators
 git-config                              ancillarymanipulators           complete
+git-config-batch                        plumbinginterrogators
 git-count-objects                       ancillaryinterrogators
 git-credential                          purehelpers
 git-credential-cache                    purehelpers

git.c

@@ -557,6 +557,7 @@ static struct cmd_struct commands[] = {
 	{ "commit-graph", cmd_commit_graph, RUN_SETUP },
 	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
 	{ "config", cmd_config, RUN_SETUP_GENTLY | DELAY_PAGER_CONFIG },
+	{ "config-batch", cmd_config_batch, RUN_SETUP_GENTLY },
 	{ "count-objects", cmd_count_objects, RUN_SETUP },
 	{ "credential", cmd_credential, RUN_SETUP_GENTLY | NO_PARSEOPT },
 	{ "credential-cache", cmd_credential_cache },

meson.build

@@ -582,6 +582,7 @@ builtin_sources = [
   'builtin/commit-tree.c',
   'builtin/commit.c',
   'builtin/config.c',
+  'builtin/config-batch.c',
   'builtin/count-objects.c',
   'builtin/credential-cache--daemon.c',
   'builtin/credential-cache.c',

t/meson.build

@@ -186,6 +186,7 @@ integration_tests = [
   't1309-early-config.sh',
   't1310-config-default.sh',
   't1311-config-optional.sh',
+  't1312-config-batch.sh',
   't1350-config-hooks-path.sh',
   't1400-update-ref.sh',
   't1401-symbolic-ref.sh',

t/t1312-config-batch.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+test_description='Test git config-batch'
+
+. ./test-lib.sh
+
+test_expect_success 'help text' '
+	test_must_fail git config-batch -h >out &&
+	grep usage out
+'
+
+test_done