From 18daa9110808af03e0aa56b91c10df9dafec2135 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Fri, 10 Jan 2014 00:22:07 +0000
Subject: [PATCH] gui: Use cpp magic to define command handlers.

This shortens the code a bit and avoids duplications. The command
handler for cancel_scroll had to be renamed from com_cancel_scrolling()
to com_cancel_scroll() since the old name did not match command name.
---
 gui.c | 146 +++++++++++++++-------------------------------------------
 1 file changed, 37 insertions(+), 109 deletions(-)

diff --git a/gui.c b/gui.c
index 894fc2f8..b2397146 100644
--- a/gui.c
+++ b/gui.c
@@ -85,114 +85,42 @@ struct gui_command {
 
 static struct gui_theme theme;
 
-static void com_help(void);
-static void com_reread_conf(void);
-static void com_enlarge_top_win(void);
-static void com_shrink_top_win(void);
-static void com_version(void);
-__noreturn static void com_quit(void);
-static void com_refresh(void);
-static void com_ll_incr(void);
-static void com_ll_decr(void);
-static void com_prev_theme(void);
-static void com_next_theme(void);
-static void com_scroll_up(void);
-static void com_scroll_down(void);
-static void com_page_up(void);
-static void com_page_down(void);
-static void com_cancel_scrolling(void);
-static void com_scroll_top(void);
-
-static struct gui_command command_list[] = {
-	{
-		.key = "?",
-		.name = "help",
-		.description = "print help",
-		.handler = com_help
-	}, {
-		.key = "+",
-		.name = "enlarge_win",
-		.description = "enlarge the top window",
-		.handler = com_enlarge_top_win
-	}, {
-		.key = "-",
-		.name = "shrink_win",
-		.description = "shrink the top window",
-		.handler = com_shrink_top_win
-	}, {
-		.key = "r",
-		.name = "reread_conf",
-		.description = "reread configuration file",
-		.handler = com_reread_conf
-	}, {
-		.key = "q",
-		.name = "quit",
-		.description = "exit para_gui",
-		.handler = com_quit
-	}, {
-		.key = "^L",
-		.name = "refresh",
-		.description = "redraw the screen",
-		.handler = com_refresh
-	}, {
-		.key = ".",
-		.name = "next_theme",
-		.description = "switch to next theme",
-		.handler = com_next_theme
-	}, {
-		.key = ",",
-		.name = "prev_theme",
-		.description = "switch to previous stream",
-		.handler = com_prev_theme
-	}, {
-		.key = ">",
-		.name = "ll_incr",
-		.description = "increase loglevel (decreases verbosity)",
-		.handler = com_ll_incr
-	}, {
-		.key = "<",
-		.name = "ll_decr",
-		.description = "decrease loglevel (increases verbosity)",
-		.handler = com_ll_decr
-	}, {
-		.key = "V",
-		.name = "version",
-		.description = "show the para_gui version",
-		.handler = com_version
-	}, {
-		.key = "<up>",
-		.name = "scroll_up",
-		.description = "scroll up one line",
-		.handler = com_scroll_up
-	}, {
-		.key = "<down>",
-		.name = "scroll_down",
-		.description = "scroll down one line",
-		.handler = com_scroll_down
-	}, {
-		.key = "<ppage>",
-		.name = "page_up",
-		.description = "scroll up one page",
-		.handler = com_page_up
-	}, {
-		.key = "<npage>",
-		.name = "page_down",
-		.description = "scroll down one page",
-		.handler = com_page_down
-	}, {
-		.key = "<home>",
-		.name = "scroll_top",
-		.description = "scroll to top of buffer",
-		.handler = com_scroll_top
-	}, {
-		.key = "<end>",
-		.name = "cancel_scroll",
-		.description = "deactivate scroll mode",
-		.handler = com_cancel_scrolling
-	}, {
-		.handler = NULL
-	}
-};
+#define GUI_COMMANDS \
+	GUI_COMMAND(help, "?", "print help") \
+	GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
+	GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
+	GUI_COMMAND(reread_conf, "r", "reread configuration file") \
+	GUI_COMMAND(quit, "q", "exit para_gui") \
+	GUI_COMMAND(refresh, "^L", "redraw the screen") \
+	GUI_COMMAND(next_theme, ".", "switch to next theme") \
+	GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
+	GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
+	GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
+	GUI_COMMAND(version, "V", "show the para_gui version") \
+	GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
+	GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
+	GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
+	GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
+	GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
+	GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
+
+/* declare command handlers */
+#define GUI_COMMAND(_c, _k, _d) \
+	static void com_ ## _c(void);
+GUI_COMMANDS
+
+#undef GUI_COMMAND
+
+/* define command array */
+#define GUI_COMMAND(_c, _k, _d) \
+	{ \
+		.key = _k, \
+		.name = #_c, \
+		.description = _d, \
+		.handler = com_ ## _c \
+	},
+
+static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
 
 static int find_cmd_byname(char *name)
 {
@@ -1245,7 +1173,7 @@ static void com_scroll_top(void)
 	print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
 }
 
-static void com_cancel_scrolling(void)
+static void com_cancel_scroll(void)
 {
 
 	if (scroll_position == 0) {
-- 
2.39.5