Awesome
C-code generator for docopt language
Note, at this point the code generator handles only options (positional arguments, commands and pattern matching will follow).
Step 1. Describe your CLI in docopt language
Naval Fate.
Usage:
naval_fate ship create <name>...
naval_fate ship <name> move <x> <y> [--speed=<kn>]
naval_fate ship shoot <x> <y>
naval_fate mine (set|remove) <x> <y> [--moored|--drifting]
naval_fate --help
naval_fate --version
Options:
-h --help Show this screen.
--version Show version.
--speed=<kn> Speed in knots [default: 10].
--moored Moored (anchored) mine.
--drifting Drifting mine.
Step 2. Generate the C code
$ python -m docopt_c -o docopt.c example.docopt
or by using pipe
$ cat example.docopt | python -m docopt_c > docopt.c
Step 3. Include the generated docopt.c
into your program
#include "docopt.h"
int main(int argc, char *argv[])
{
struct DocoptArgs args = docopt(argc, argv, /* help */ 1, /* version */ "2.0rc2");
puts("Commands");
printf("\tmine == %s\n", args.mine ? "true" : "false");
printf("\tmove == %s\n", args.move ? "true" : "false");
printf("\tcreate == %s\n", args.create ? "true" : "false");
printf("\tremove == %s\n", args.remove ? "true" : "false");
printf("\tset == %s\n", args.set ? "true" : "false");
printf("\tship == %s\n", args.ship ? "true" : "false");
printf("\tshoot == %s\n", args.shoot ? "true" : "false");
puts("Arguments");
printf("\tx == %s\n", args.x);
printf("\ty == %s\n", args.y);
puts("Flags");
printf("\t--drifting == %s\n", args.drifting ? "true" : "false");
printf("\t--help == %s\n", args.help ? "true" : "false");
printf("\t--moored == %s\n", args.moored ? "true" : "false");
printf("\t--version == %s\n", args.version ? "true" : "false");
puts("Options");
printf("\t--speed == %s\n", args.speed);
return EXIT_SUCCESS;
}
Step 4. Profit!
$ c99 example.c -o example.out
$ ./example.out mine --drifting --speed=20
Commands
mine == true
move == false
create == false
remove == false
set == false
ship == false
shoot == false
Arguments
x == (null)
y == (null)
Flags
--drifting == true
--help == false
--moored == false
--version == false
Options
--speed == 20
Development
See the Python version's page for more info on developing.