[PATCH 03/13] builtin: create url-parse command

["Matheus Afonso Martins Moreira via GitGitGadget" <gitgitgadget@gmail.com>]

From: Matheus Afonso Martins Moreira <matheus@matheusmoreira.com>

Git commands can accept a rather wide variety of URLs syntaxes.
The range of accepted inputs might expand even more in the future.
This makes the parsing of URL components difficult since standard URL
parsers cannot be used. Extracting the components of a git URL would
require implementing all the schemes that git itself supports, not to
mention tracking its development continuously in case new URL schemes
are added.

The url-parse builtin command is designed to solve this problem
by exposing git's native URL parsing facilities as a plumbing command.
Other programs can then call upon git itself to parse the git URLs and
extract their components. This should be quite useful for scripts.

Signed-off-by: Matheus Afonso Martins Moreira <matheus@matheusmoreira.com>
---
 .gitignore          |  1 +
 Makefile            |  1 +
 builtin.h           |  1 +
 builtin/url-parse.c | 18 ++++++++++++++++++
 command-list.txt    |  1 +
 git.c               |  1 +
 6 files changed, 23 insertions(+)
 create mode 100644 builtin/url-parse.c

diff --git a/.gitignore b/.gitignore
index 612c0f6a0ff..4f8dde600a5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -174,6 +174,7 @@
 /git-update-server-info
 /git-upload-archive
 /git-upload-pack
+/git-url-parse
 /git-var
 /git-verify-commit
 /git-verify-pack
diff --git a/Makefile b/Makefile
index 1e31acc72ec..b6054b5c1f4 100644
--- a/Makefile
+++ b/Makefile
@@ -1326,6 +1326,7 @@ BUILTIN_OBJS += builtin/update-ref.o
 BUILTIN_OBJS += builtin/update-server-info.o
 BUILTIN_OBJS += builtin/upload-archive.o
 BUILTIN_OBJS += builtin/upload-pack.o
+BUILTIN_OBJS += builtin/url-parse.o
 BUILTIN_OBJS += builtin/var.o
 BUILTIN_OBJS += builtin/verify-commit.o
 BUILTIN_OBJS += builtin/verify-pack.o
diff --git a/builtin.h b/builtin.h
index 28280636da8..e8858808943 100644
--- a/builtin.h
+++ b/builtin.h
@@ -240,6 +240,7 @@ int cmd_update_server_info(int argc, const char **argv, const char *prefix);
 int cmd_upload_archive(int argc, const char **argv, const char *prefix);
 int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix);
 int cmd_upload_pack(int argc, const char **argv, const char *prefix);
+int cmd_url_parse(int argc, const char **argv, const char *prefix);
 int cmd_var(int argc, const char **argv, const char *prefix);
 int cmd_verify_commit(int argc, const char **argv, const char *prefix);
 int cmd_verify_tag(int argc, const char **argv, const char *prefix);
diff --git a/builtin/url-parse.c b/builtin/url-parse.c
new file mode 100644
index 00000000000..994ccec4b2e
--- /dev/null
+++ b/builtin/url-parse.c
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * url-parse - parses git URLs and extracts their components
+ *
+ * Copyright © 2024 Matheus Afonso Martins Moreira
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2.
+ */
+
+#include "builtin.h"
+#include "gettext.h"
+
+int cmd_url_parse(int argc, const char **argv, const char *prefix)
+{
+	return 0;
+}
diff --git a/command-list.txt b/command-list.txt
index c4cd0f352b8..6d89b6c4dc6 100644
--- a/command-list.txt
+++ b/command-list.txt
@@ -196,6 +196,7 @@ git-update-ref                          plumbingmanipulators
 git-update-server-info                  synchingrepositories
 git-upload-archive                      synchelpers
 git-upload-pack                         synchelpers
+git-url-parse                           plumbinginterrogators
 git-var                                 plumbinginterrogators
 git-verify-commit                       ancillaryinterrogators
 git-verify-pack                         plumbinginterrogators
diff --git a/git.c b/git.c
index 654d615a188..7aac812d9d4 100644
--- a/git.c
+++ b/git.c
@@ -625,6 +625,7 @@ static struct cmd_struct commands[] = {
 	{ "upload-archive", cmd_upload_archive, NO_PARSEOPT },
 	{ "upload-archive--writer", cmd_upload_archive_writer, NO_PARSEOPT },
 	{ "upload-pack", cmd_upload_pack },
+	{ "url-parse", cmd_url_parse, NO_PARSEOPT },
 	{ "var", cmd_var, RUN_SETUP_GENTLY | NO_PARSEOPT },
 	{ "verify-commit", cmd_verify_commit, RUN_SETUP },
 	{ "verify-pack", cmd_verify_pack },
-- 
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