git-repo-config --list support

This adds git-repo-config --list (or git-repo-config -l) support,
similar to what git-var -l does now (to be phased out so that we
have a single sane interface to the config file instead of fragmented
and confused API).

Signed-off-by: Petr Baudis <pasky@suse.cz>

Documentation/git-repo-config.txt

@@ -15,6 +15,7 @@ SYNOPSIS
 'git-repo-config' [type] --get-all name [value_regex]
 'git-repo-config' [type] --unset name [value_regex]
 'git-repo-config' [type] --unset-all name [value_regex]
+'git-repo-config' -l | --list
 
 DESCRIPTION
 -----------
@@ -64,6 +65,9 @@ OPTIONS
 --unset-all::
 	Remove all matching lines from .git/config.
 
+-l, --list::
+	List all variables set in .git/config.
+
 
 EXAMPLE
 -------

repo-config.c

@@ -2,7 +2,7 @@
 #include <regex.h>
 
 static const char git_config_set_usage[] =
-"git-repo-config [ --bool | --int ] [--get | --get-all | --replace-all | --unset | --unset-all] name [value [value_regex]]";
+"git-repo-config [ --bool | --int ] [--get | --get-all | --replace-all | --unset | --unset-all] name [value [value_regex]] | --list";
 
 static char* key = NULL;
 static char* value = NULL;
@@ -12,6 +12,15 @@ static int do_not_match = 0;
 static int seen = 0;
 static enum { T_RAW, T_INT, T_BOOL } type = T_RAW;
 
+static int show_all_config(const char *key_, const char *value_)
+{
+	if (value_)
+		printf("%s=%s\n", key_, value_);
+	else
+		printf("%s\n", key_);
+	return 0;
+}
+
 static int show_config(const char* key_, const char* value_)
 {
 	if (value_ == NULL)
@@ -67,7 +76,7 @@ static int get_value(const char* key_, const char* regex_)
 		}
 	}
 
-	i = git_config(show_config);
+	git_config(show_config);
 	if (value) {
 		printf("%s\n", value);
 		free(value);
@@ -99,6 +108,9 @@ int main(int argc, const char **argv)
 		argv++;
 	}
 
+	if (!strcmp(argv[1], "--list") || !strcmp(argv[1], "-l"))
+		return git_config(show_all_config);
+
 	switch (argc) {
 	case 2:
 		return get_value(argv[1], NULL);