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-rw-r--r--builtin/env--helper.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/builtin/env--helper.c b/builtin/env--helper.c
new file mode 100644
index 0000000..ea04c16
--- /dev/null
+++ b/builtin/env--helper.c
@@ -0,0 +1,100 @@
+#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
+};
+
+enum cmdmode {
+ ENV_HELPER_TYPE_BOOL = 1,
+ ENV_HELPER_TYPE_ULONG
+};
+
+static int option_parse_type(const struct option *opt, const char *arg,
+ int unset)
+{
+ enum cmdmode *cmdmode = opt->value;
+
+ BUG_ON_OPT_NEG(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;
+ enum cmdmode cmdmode = 0;
+ 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_OPT);
+ 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;
+}