Merge pull request #27 from tjeezy/fix_default_options

fixes default option value (closes issue #26)

Author: Vladimir Keleshev

docopt.c

@@ -286,7 +286,8 @@ int elems_to_args(Elements *elements, DocoptArgs *args, bool help,
         } else if (!strcmp(option->olong, "--version")) {
             args->version = option->value;
         } else if (!strcmp(option->olong, "--speed")) {
-            args->speed = option->argument;
+            if (option->argument)
+                args->speed = option->argument;
         }
     }
     /* commands */
@@ -363,3 +364,4 @@ DocoptArgs docopt(int argc, char *argv[], bool help, const char *version) {
         exit(EXIT_SUCCESS);
     return args;
 }
+

docopt_c.py

@@ -91,7 +91,8 @@ def c_if_flag(o):
 
 def c_if_option(o):
     t = """ else if (!strcmp(option->o%s, %s)) {
-            args->%s = option->argument;
+            if (option->argument)
+                args->%s = option->argument;
         }"""
     return t % (('long' if o.long else 'short'),
                 to_c(o.long or o.short),