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 --versionOptions:  -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

$ cat example.docopt| python -m docopt_c> docopt.c

Step 3. Include the generateddocopt.c into your program

#include"docopt.h"intmain(intargc,char*argv[]){structDocoptArgsargs=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);returnEXIT_SUCCESS;}

Step 4. Profit!

$ c99 example.c -o example.out$ ./example.out mine --drifting --speed=20Commands    mine ==true    move ==false    create ==false    remove ==falseset ==false    ship ==false    shoot ==falseArguments    x == (null)    y == (null)Flags    --drifting ==true    --help ==false    --moored ==false    --version ==falseOptions    --speed == 20

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