cmd: Add an option to force the command line arguments.

The next commit will add modeline support. By default, modelines have
the final work on which options to set. However, mostly for testing,
this isn't flexible enough.

options.c

@@ -37,6 +37,7 @@ exit_help(int exit_code)
 "Usage: awesome [OPTION]\n\
   -h, --help           show help\n\
   -v, --version        show version\n\
+  -f, --force          ignore modelines and apply the command line arguments\n\
   -c, --config FILE    configuration file to use\n\
       --search DIR     add a directory to the library search path\n\
   -k, --check          check configuration file syntax\n\
@@ -58,6 +59,7 @@ options_check_args(int argc, char **argv, int *init_flags, string_array_t *paths
         { "help",    NO_ARG, NULL, 'h'  },
         { "version", NO_ARG, NULL, 'v'  },
         { "config",  ARG   , NULL, 'c'  },
+        { "force" ,  NO_ARG, NULL, 'f'  },
         { "check",   NO_ARG, NULL, 'k'  },
         { "search",  ARG   , NULL, 's'  },
         { "no-argb", NO_ARG, NULL, 'a'  },
@@ -81,6 +83,9 @@ options_check_args(int argc, char **argv, int *init_flags, string_array_t *paths
             if (! ((*init_flags) & INIT_FLAG_ALLOW_FALLBACK))
                 exit_help(EXIT_SUCCESS);
             break;
+          case 'f':
+            (*init_flags) |= INIT_FLAG_FORCE_CMD_ARGS;
+            break;
           case 'k':
             (*init_flags) |= INIT_FLAG_RUN_TEST;
             break;

options.h

@@ -31,6 +31,7 @@ typedef enum {
     INIT_FLAG_REPLACE_WM     = 0x1 << 2,
     INIT_FLAG_AUTO_SCREEN    = 0x1 << 3,
     INIT_FLAG_ALLOW_FALLBACK = 0x1 << 4,
+    INIT_FLAG_FORCE_CMD_ARGS = 0x1 << 5,
 } awesome_init_config_t;
 
 char *options_check_args(int argc, char **argv, int *init_flags, string_array_t *paths);

tests/run.sh

@@ -115,7 +115,7 @@ fi
 # shellcheck disable=SC2206
 awesome_options=($AWESOME_OPTIONS $manual_screens --search lib --search "$this_dir")
 
-awesome_options+=(--screen off)
+awesome_options+=(--screen off --force)
 
 # Cleanup on errors / aborting.
 cleanup() {