1 files changed, 95 insertions, 0 deletions
diff --git a/builtin/env--helper.c b/builtin/env--helper.c
new file mode 100644
index 000000000000..23c214fff6d6
--- /dev/null
+++ b/builtin/env--helper.c
@@ -0,0 +1,95 @@
+#include "builtin.h"
+#include "config.h"
+#include "parse-options.h"
+
+static char const * const env__helper_usage[] = {
+	N_("git env--helper --type=[bool|ulong] <options> <env-var>"),
+	NULL
+};
+
+static enum {
+	ENV_HELPER_TYPE_BOOL = 1,
+	ENV_HELPER_TYPE_ULONG
+} cmdmode = 0;
+
+static int option_parse_type(const struct option *opt, const char *arg,
+			     int unset)
+{
+	if (!strcmp(arg, "bool"))
+		cmdmode = ENV_HELPER_TYPE_BOOL;
+	else if (!strcmp(arg, "ulong"))
+		cmdmode = ENV_HELPER_TYPE_ULONG;
+	else
+		die(_("unrecognized --type argument, %s"), arg);
+
+	return 0;
+}
+
+int cmd_env__helper(int argc, const char **argv, const char *prefix)
+{
+	int exit_code = 0;
+	const char *env_variable = NULL;
+	const char *env_default = NULL;
+	int ret;
+	int ret_int, default_int;
+	unsigned long ret_ulong, default_ulong;
+	struct option opts[] = {
+		OPT_CALLBACK_F(0, "type", &cmdmode, N_("type"),
+			       N_("value is given this type"), PARSE_OPT_NONEG,
+			       option_parse_type),
+		OPT_STRING(0, "default", &env_default, N_("value"),
+			   N_("default for git_env_*(...) to fall back on")),
+		OPT_BOOL(0, "exit-code", &exit_code,
+			 N_("be quiet only use git_env_*() value as exit code")),
+		OPT_END(),
+	};
+
+	argc = parse_options(argc, argv, prefix, opts, env__helper_usage,
+			     PARSE_OPT_KEEP_UNKNOWN);
+	if (env_default && !*env_default)
+		usage_with_options(env__helper_usage, opts);
+	if (!cmdmode)
+		usage_with_options(env__helper_usage, opts);
+	if (argc != 1)
+		usage_with_options(env__helper_usage, opts);
+	env_variable = argv[0];
+
+	switch (cmdmode) {
+	case ENV_HELPER_TYPE_BOOL:
+		if (env_default) {
+			default_int = git_parse_maybe_bool(env_default);
+			if (default_int == -1) {
+				error(_("option `--default' expects a boolean value with `--type=bool`, not `%s`"),
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_int = 0;
+		}
+		ret_int = git_env_bool(env_variable, default_int);
+		if (!exit_code)
+			puts(ret_int ? "true" : "false");
+		ret = ret_int;
+		break;
+	case ENV_HELPER_TYPE_ULONG:
+		if (env_default) {
+			if (!git_parse_ulong(env_default, &default_ulong)) {
+				error(_("option `--default' expects an unsigned long value with `--type=ulong`, not `%s`"),
+				      env_default);
+				usage_with_options(env__helper_usage, opts);
+			}
+		} else {
+			default_ulong = 0;
+		}
+		ret_ulong = git_env_ulong(env_variable, default_ulong);
+		if (!exit_code)
+			printf("%lu\n", ret_ulong);
+		ret = ret_ulong;
+		break;
+	default:
+		BUG("unknown <type> value");
+		break;
+	}
+
+	return !ret;
+}