specify func argument and related cleanup (#183)

* specifies the function argument type in commands.h compared to leaving
  it unspecified. all the functions in cmd_t must have arg_t as it's
  argument.
* changes to commands.h will now trigger a rebuild - this restores old
  behavior prior to 12efa0e
* cg_quit now uses it's argument as exit status
* DestroyNotify invokes cg_quit rather than calling exit directly.
* Explicitly pass EXIT_SUCCESS to cgquit in keybinding

Co-authored-by: Berke Kocaoğlu <berke.kocaoglu@metu.edu.tr>

Makefile

@@ -64,7 +64,7 @@ nsxiv: $(OBJS)
 	@echo "CC $@"
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
-$(OBJS): Makefile nsxiv.h config.h
+$(OBJS): Makefile nsxiv.h config.h commands.h
 options.o: version.h
 window.o: icon/data.h
 

commands.c

@@ -52,7 +52,7 @@ extern int markidx;
 extern int prefix;
 extern bool extprefix;
 
-bool cg_quit(arg_t _)
+bool cg_quit(arg_t status)
 {
 	unsigned int i;
 
@@ -62,7 +62,7 @@ bool cg_quit(arg_t _)
 				printf("%s%c", files[i].name, options->using_null ? '\0' : '\n');
 		}
 	}
-	exit(EXIT_SUCCESS);
+	exit(status);
 }
 
 bool cg_switch_mode(arg_t _)

commands.h

@@ -3,42 +3,42 @@
 #include <stdbool.h>
 
 /* global */
-bool cg_change_gamma();
-bool cg_first();
-bool cg_mark_range();
-bool cg_n_or_last();
-bool cg_navigate_marked();
-bool cg_prefix_external();
-bool cg_quit();
-bool cg_reload_image();
-bool cg_remove_image();
-bool cg_reverse_marks();
-bool cg_scroll_screen();
-bool cg_switch_mode();
-bool cg_toggle_bar();
-bool cg_toggle_fullscreen();
-bool cg_toggle_image_mark();
-bool cg_unmark_all();
-bool cg_zoom();
+bool cg_change_gamma(arg_t);
+bool cg_first(arg_t);
+bool cg_mark_range(arg_t);
+bool cg_n_or_last(arg_t);
+bool cg_navigate_marked(arg_t);
+bool cg_prefix_external(arg_t);
+bool cg_quit(arg_t);
+bool cg_reload_image(arg_t);
+bool cg_remove_image(arg_t);
+bool cg_reverse_marks(arg_t);
+bool cg_scroll_screen(arg_t);
+bool cg_switch_mode(arg_t);
+bool cg_toggle_bar(arg_t);
+bool cg_toggle_fullscreen(arg_t);
+bool cg_toggle_image_mark(arg_t);
+bool cg_unmark_all(arg_t);
+bool cg_zoom(arg_t);
 /* image mode */
-bool ci_alternate();
-bool ci_cursor_navigate();
-bool ci_drag();
-bool ci_fit_to_win();
-bool ci_flip();
-bool ci_navigate();
-bool ci_navigate_frame();
-bool ci_rotate();
-bool ci_scroll();
-bool ci_scroll_to_edge();
-bool ci_set_zoom();
-bool ci_slideshow();
-bool ci_toggle_alpha();
-bool ci_toggle_animation();
+bool ci_alternate(arg_t);
+bool ci_cursor_navigate(arg_t);
+bool ci_drag(arg_t);
+bool ci_fit_to_win(arg_t);
+bool ci_flip(arg_t);
+bool ci_navigate(arg_t);
+bool ci_navigate_frame(arg_t);
+bool ci_rotate(arg_t);
+bool ci_scroll(arg_t);
+bool ci_scroll_to_edge(arg_t);
+bool ci_set_zoom(arg_t);
+bool ci_slideshow(arg_t);
+bool ci_toggle_alpha(arg_t);
+bool ci_toggle_animation(arg_t);
 bool ci_toggle_antialias();
 /* thumbnails mode */
-bool ct_move_sel();
-bool ct_reload_all();
+bool ct_move_sel(arg_t);
+bool ct_reload_all(arg_t);
 
 /* global */
 #define g_change_gamma { cg_change_gamma, MODE_ALL }
@@ -80,4 +80,4 @@ bool ct_reload_all();
 #define t_move_sel { ct_move_sel, MODE_THUMB }
 #define t_reload_all { ct_reload_all, MODE_THUMB }
 
-#endif
+#endif /* COMMANDS_H */

config.def.h

@@ -89,7 +89,7 @@ static const KeySym KEYHANDLER_ABORT = XK_Escape;
 /* keyboard mappings for image and thumbnail mode: */
 static const keymap_t keys[] = {
 	/* modifiers    key               function              argument */
-	{ 0,            XK_q,             g_quit,               None },
+	{ 0,            XK_q,             g_quit,               EXIT_SUCCESS },
 	{ 0,            XK_Return,        g_switch_mode,        None },
 	{ 0,            XK_f,             g_toggle_fullscreen,  None },
 	{ 0,            XK_b,             g_toggle_bar,         None },

main.c

@@ -802,10 +802,10 @@ static void run(void)
 				break;
 			case ClientMessage:
 				if ((Atom) ev.xclient.data.l[0] == atoms[ATOM_WM_DELETE_WINDOW])
-					cg_quit();
+					cg_quit(EXIT_SUCCESS);
 				break;
 			case DestroyNotify:
-				exit(EXIT_FAILURE);
+				cg_quit(EXIT_FAILURE);
 				break;
 			case ConfigureNotify:
 				if (win_configure(&win, &ev.xconfigure)) {