warp/args.h

#ifndef __MYARGP__
#define __MYARGP__
#include <argp.h>
#include <string.h>
#include <stdbool.h>
#include <hoedown/buffer.h>

/* This structure is used by main to communicate with parse_opt. */
struct arguments {
    char *infile;
    char *langs;
    bool complement;
};

/*
   OPTIONS.  Field 1 in ARGP.
   Order of fields: {NAME, KEY, ARG, FLAGS, DOC}.
*/
static struct argp_option options[] = {
    {"language",  'L', "LANGUAGES", 0,
        "Provide a comma-separated list of languages. Use 'generic' for unspecified. Defaults to 'all'."},
    {"complement", 'c', 0, 0,
        "Only print out languages NOT selected by --language."},
    {0}
};

/*
   PARSER. Field 2 in ARGP.
   Order of parameters: KEY, ARG, STATE.
*/
static error_t parse_opt (int key, char *arg, struct argp_state *state) {
    struct arguments *arguments = state->input;
    switch (key) {
        case 'c':
            arguments->complement = true;
            break;
        case 'L':
            arguments->langs = arg;
            break;
        case ARGP_KEY_ARG:
            if(state->arg_num > 0) {
                argp_usage(state);
            }
            arguments->infile = arg;
            break;
        default:
            return ARGP_ERR_UNKNOWN;
    }
    return 0;
}

/*
   ARGS_DOC. Field 3 in ARGP.
   A description of the non-option command-line arguments
     that we accept.
*/
static char args_doc[] = "[FILE]";

/*
  DOC.  Field 4 in ARGP.
  Program documentation.
*/
static char doc[] = "warp -- tangle fenced code from markdown.\n\n\
If FILE is unspecified, read from stdin.";

/*
   The ARGP structure itself.
*/
static struct argp argp = {options, parse_opt, args_doc, doc};
#endif