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Add automatic --help to print usage

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This commit is contained in:
Bruce Hill 2024-09-04 14:34:24 -04:00
parent f99e94c532
commit 0d098c118b
1 changed files with 13 additions and 0 deletions
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13
compile.c
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@ -2983,7 +2983,9 @@ CORD compile_cli_arg_call(env_t *env, CORD fn_name, type_t *fn_type)
env_t *main_env = fresh_scope(env);
CORD usage = CORD_EMPTY;
bool has_help = false;
for (arg_t *arg = fn_info->args; arg; arg = arg->next) {
if (streq(arg->name, "help")) has_help = true;
usage = CORD_cat(usage, " ");
type_t *t = get_arg_type(main_env, arg);
CORD flag = CORD_replace(arg->name, "_", "-");
@ -3001,6 +3003,10 @@ CORD compile_cli_arg_call(env_t *env, CORD fn_name, type_t *fn_type)
usage = CORD_all(usage, "<", flag, ">");
}
}
if (!has_help)
usage = CORD_all(" [--help]", usage);
CORD code = CORD_all("CORD usage = CORD_all(\"Usage: \", argv[0], ", usage ? CORD_quoted(usage) : "CORD_EMPTY", ");\n",
"#define USAGE_ERR(...) errx(1, CORD_to_const_char_star(CORD_all(__VA_ARGS__)))\n"
"#define IS_FLAG(str, flag) (strncmp(str, flag, strlen(flag) == 0 && (str[strlen(flag)] == 0 || str[strlen(flag)] == '=')) == 0)\n");
@ -3022,6 +3028,13 @@ CORD compile_cli_arg_call(env_t *env, CORD fn_name, type_t *fn_type)
"break;\n"
"}\n"
"if (strncmp(argv[i], \"--\", 2) != 0) {\n++i;\ncontinue;\n}\n");
if (!has_help) {
code = CORD_all(code, "else if (pop_flag(argv, &i, \"help\", &flag)) {\n"
"CORD_printf(\"%r\\n\", usage);\n"
"return 0;\n"
"}\n");
}
for (arg_t *arg = fn_info->args; arg; arg = arg->next) {
type_t *t = get_arg_type(main_env, arg);
CORD flag = CORD_replace(arg->name, "_", "-");