sample/example_fromfile.c

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include "argparse-c.h"

int main(int argc, char **argv) {
  ap_error err = {0};
  ap_namespace *ns = NULL;
  ap_parser_options parser_options = ap_parser_options_default();
  parser_options.fromfile_prefix_chars = "@";

  ap_parser *parser = ap_parser_new_with_options(
      "example_fromfile", "fromfile_prefix_chars demo.", parser_options);
  if (!parser) {
    fprintf(stderr, "failed to initialize parser\n");
    return 1;
  }

  ap_arg_options mode_opts = ap_arg_options_default();
  mode_opts.help = "run mode.";
  if (ap_add_argument(parser, "--mode", mode_opts, &err) != 0) {
    fprintf(stderr, "%s\n", err.message);
    ap_parser_free(parser);
    return 1;
  }

  ap_arg_options count_opts = ap_arg_options_default();
  count_opts.type = AP_TYPE_INT32;
  count_opts.help = "repeat count.";
  if (ap_add_argument(parser, "--count", count_opts, &err) != 0) {
    fprintf(stderr, "%s\n", err.message);
    ap_parser_free(parser);
    return 1;
  }

  ap_arg_options input_opts = ap_arg_options_default();
  input_opts.nargs = AP_NARGS_OPTIONAL;
  input_opts.help = "input path.";
  if (ap_add_argument(parser, "input", input_opts, &err) != 0) {
    fprintf(stderr, "%s\n", err.message);
    ap_parser_free(parser);
    return 1;
  }

  if (ap_parse_args(parser, argc, argv, &ns, &err) != 0) {
    char *error_text = ap_format_error(parser, &err);
    if (error_text) {
      fprintf(stderr, "%s", error_text);
      free(error_text);
    } else {
      fprintf(stderr, "error: %s\n", err.message);
    }
    ap_parser_free(parser);
    return 1;
  }

  {
    bool is_help = false;
    if (ap_ns_get_bool(ns, "help", &is_help) && is_help) {
      char *help = ap_format_help(parser);
      if (help) {
        printf("%s", help);
        free(help);
      }
      ap_namespace_free(ns);
      ap_parser_free(parser);
      return 0;
    }
  }

  {
    const char *mode = NULL;
    const char *input = NULL;
    int32_t count = 0;

    ap_ns_get_string(ns, "mode", &mode);
    ap_ns_get_int32(ns, "count", &count);
    ap_ns_get_string(ns, "input", &input);

    printf("mode=%s\n", mode ? mode : "(null)");
    printf("count=%d\n", count);
    printf("input=%s\n", input ? input : "(null)");
  }

  ap_namespace_free(ns);
  ap_parser_free(parser);
  return 0;
}