Add git-config-set, a simple helper for scripts to set config variables

This is meant for the end user, who cannot be expected to edit
.git/config by hand.

Example:

	git-config-set core.filemode true

will set filemode in the section [core] to true,

	git-config-set --unset core.filemode

will remove the entry (failing if it is not there), and

	git-config-set --unset diff.twohead ^recar

will remove the unique entry whose value matches the regex "^recar"
(failing if there is no unique such entry).

It is just a light wrapper around git_config_set() and
git_config_set_multivar().

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/config-set.c b/config-set.c
new file mode 100644
index 000000000..1b1547b53
--- /dev/null
+++ b/config-set.c
@@ -0,0 +1,26 @@
+#include "cache.h"
+
+static const char git_config_set_usage[] =
+"git-config-set name [value [value_regex]] | --unset name [value_regex]";
+
+int main(int argc, const char **argv)
+{
+	setup_git_directory();
+	switch (argc) {
+	case 2:
+		return git_config_set(argv[1], NULL);
+	case 3:
+		if (!strcmp(argv[1], "--unset"))
+			return git_config_set(argv[2], NULL);
+		else
+			return git_config_set(argv[1], argv[2]);
+	case 4:
+		if (!strcmp(argv[1], "--unset"))
+			return git_config_set_multivar(argv[2], NULL, argv[3]);
+		else
+			return git_config_set_multivar(argv[1], argv[2], argv[3]);
+	default:
+		usage(git_config_set_usage);
+	}
+	return 0;
+}