gui: Recognize "home" and "end" keys.

And map them to new functions which scroll to the top and the bottom of
the output window.

diff --git a/gui.c b/gui.c
index 3b001a7da191a7c5f52a177ee73e0045c81ce05c..42e7dd072ddbbad1ffdd04e8aeedab3884c51e53 100644 (file)
--- a/gui.c
+++ b/gui.c
@@ -109,6 +109,8 @@ 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[] = {
        {
@@ -186,6 +188,16 @@ static struct gui_command command_list[] = {
                .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
        }
@@ -230,6 +242,14 @@ static char *km_keyname(int c)
                sprintf(buf, "<ppage>");
                return buf;
        }
+       if (c == KEY_HOME) {
+               sprintf(buf, "<home>");
+               return buf;
+       }
+       if (c == KEY_END) {
+               sprintf(buf, "<end>");
+               return buf;
+       }
        if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
                if (c < 0)
                        c += 256;
@@ -1097,6 +1117,41 @@ static void print_scroll_msg(void)
                filled - scroll_position, ringbuffer_filled(bot_win_rb));
 }
 
+static void com_scroll_top(void)
+{
+       int i = RINGBUFFER_SIZE - 1;
+       unsigned lines = 0;
+
+       while (i > 0 && !ringbuffer_get(bot_win_rb, i))
+               i--;
+       /* i is oldest entry */
+       for (; lines < bot.lines && i >= 0; i--) {
+               struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
+               if (!rbe)
+                       break;
+               lines += NUM_LINES(strlen(rbe->msg));
+       }
+       i++;
+       if (lines > 0 && scroll_position != i) {
+               scroll_position = i;
+               redraw_bot_win();
+               print_scroll_msg();
+               return;
+       }
+       print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
+}
+
+static void com_cancel_scrolling(void)
+{
+
+       if (scroll_position == 0) {
+               print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
+               return;
+       }
+       scroll_position = 0;
+       redraw_bot_win();
+}
+
 static void com_page_down(void)
 {
        unsigned lines = 0;