set a command for set options

doc/imv.1.txt

@@ -154,6 +154,10 @@ Commands can be entered by pressing *:*. imv supports the following commands:
 	Set the background color. 'checks' for a chequerboard pattern, or specify
 	a 6-digit hexadecimal color code. Aliased to 'bg'.
 
+*set* <option_name> <option_value>::
+	Set an option to a specific. See **OPTIONS** in **imv**(5) for the right option_name and
+	option_values.
+
 *bind* <keys> <commands>::
 	Binds an action to a set of key inputs. Uses the same syntax as the config
 	file, but without an equals sign between the keys and the commands. For

src/imv.c

@@ -194,6 +194,7 @@ static void command_set_scaling_mode(struct list *args, const char *argstr, void
 static void command_set_upscaling_method(struct list *args, const char *argstr, void *data);
 static void command_set_slideshow_duration(struct list *args, const char *argstr, void *data);
 static void command_set_background(struct list *args, const char *argstr, void *data);
+static void command_set_option(struct list *args, const char *argstr, void *data);
 static void command_bind(struct list *args, const char *argstr, void *data);
 
 static bool setup_window(struct imv *imv);
@@ -305,6 +306,7 @@ static bool add_bind(struct imv *imv, const char *keys, const char *commands)
       break;
     }
     commands = next_command;
+
   }
 
   list_deep_free(list);
@@ -495,6 +497,7 @@ struct imv *imv_create(void)
 
   imv_command_register(imv->commands, "quit", &command_quit);
   imv_command_register(imv->commands, "pan", &command_pan);
+  imv_command_register(imv->commands, "set", &command_set_option);
   imv_command_register(imv->commands, "next", &command_next);
   imv_command_register(imv->commands, "prev", &command_prev);
   imv_command_register(imv->commands, "goto", &command_goto);
@@ -1447,6 +1450,18 @@ static void command_pan(struct list *args, const char *argstr, void *data)
   imv_viewport_move(imv->view, x, y, imv->current_image);
 }
 
+static void command_set_option(struct list *args, const char *argstr, void *data)
+{
+  (void)argstr;
+  struct imv *imv = data;
+  if (args->len != 3 ) {
+    imv_log(IMV_ERROR, "set command needs 2 arguments");
+  }
+
+  handle_ini_value(imv, "options", args->items[1], args->items[2]);
+  imv->need_redraw = true;
+}
+
 static void command_next(struct list *args, const char *argstr, void *data)
 {
   (void)argstr;