commander.c

Commander option parser ported to C.

Automated --help

The previous example would produce the following --help:

Usage: example [options]

Options:

  -V, --version                 output program version
  -h, --help                    output help information
  -v, --verbose                 enable verbose stuff
  -r, --required <arg>          required arg
  -o, --optional [arg]          optional arg

Example

#include <stdio.h>
#include "commander.h"

static void
verbose(command_t *self) {
  printf("verbose: enabled\n");
}

static void
required(command_t *self) {
  printf("required: %s\n", self->arg);
}

static void
optional(command_t *self) {
  printf("optional: %s\n", self->arg);
}

int
main(int argc, const char **argv){
  command_t cmd;
  command_init(&cmd, argv[0], "0.0.1");
  command_option(&cmd, "-v", "--verbose", "enable verbose stuff", verbose);
  command_option(&cmd, "-r", "--required <arg>", "required arg", required);
  command_option(&cmd, "-o", "--optional [arg]", "optional arg", optional);
  command_parse(&cmd, argc, argv);
  printf("additional args:\n");
  for (int i = 0; i < cmd.argc; ++i) {
    printf("  - '%s'\n", cmd.argv[i]);
  }
  command_free(&cmd);
  return 0;
}

Closure

cmd.data is a void * so pass along a struct to the callbacks if you want.

Usage

cmd.usage defaults to "[options]".

Links

• Used by the mon(1) process monitor

Short flags

Compound short flags are automatically expanded to their canonical form. For example -vLO would become -v -L -O.

License

(The MIT License)

Copyright (c) 2012 TJ Holowaychuk <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.