degesch: add unbound commands for buffer movement

degesch.c

@@ -3928,6 +3928,29 @@ buffer_goto (struct app_context *ctx, int n)
 	return true;
 }
 
+static int
+buffer_count (struct app_context *ctx)
+{
+	int total = 0;
+	LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+		total++;
+	return total;
+}
+
+static void
+buffer_move (struct app_context *ctx, struct buffer *buffer, int n)
+{
+	hard_assert (n >= 1 && n <= buffer_count (ctx));
+	LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
+
+	struct buffer *following = ctx->buffers;
+	while (--n && following)
+		following = following->next;
+
+	LIST_INSERT_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer, following);
+	refresh_prompt (ctx);
+}
+
 static int
 buffer_get_index (struct app_context *ctx, struct buffer *buffer)
 {
@@ -9612,27 +9635,13 @@ handle_buffer_move (struct app_context *ctx, struct handler_args *a)
 	if (!xstrtoul (&request, a->arguments, 10))
 		return false;
 
-	unsigned long total = 0;
+	if (request == 0 || request > (unsigned long) buffer_count (ctx))
-	LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
-		total++;
-
-	if (request == 0 || request > total)
 	{
 		log_global_error (ctx, "#s: #s",
 			"Can't move buffer", "requested position is out of range");
 		return true;
 	}
-
+	buffer_move (ctx, a->buffer, request);
-	struct buffer *buffer = a->buffer;
-	LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
-
-	struct buffer *following = ctx->buffers;
-	while (--request && following)
-		following = following->next;
-
-	LIST_INSERT_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer, following);
-
-	refresh_prompt (ctx);
 	return true;
 }
 
@@ -11802,6 +11811,25 @@ on_goto_activity (int count, int key, void *user_data)
 	return true;
 }
 
+static bool
+on_move_buffer_left (int count, int key, void *user_data)
+{
+	(void) key;
+
+	struct app_context *ctx = user_data;
+	int total = buffer_count (ctx);
+	int n = buffer_get_index (ctx, ctx->current_buffer) - count;
+	if (n <= 0)  n += total * (1 + -n / total);
+	buffer_move (ctx, ctx->current_buffer, (n - 1) % total + 1);
+	return true;
+}
+
+static bool
+on_move_buffer_right (int count, int key, void *user_data)
+{
+	return on_move_buffer_left (-count, key, user_data);
+}
+
 static bool
 on_redraw_screen (int count, int key, void *user_data)
 {
@@ -11845,6 +11873,8 @@ input_add_functions (void *user_data)
 	XX ("switch-buffer",     "Switch buffer",     on_switch_buffer)
 	XX ("goto-highlight",    "Go to highlight",   on_goto_highlight)
 	XX ("goto-activity",     "Go to activity",    on_goto_activity)
+	XX ("move-buffer-left",  "Move buffer left",  on_move_buffer_left)
+	XX ("move-buffer-right", "Move buffer right", on_move_buffer_right)
 	XX ("display-backlog",   "Show backlog",      on_display_backlog)
 	XX ("display-full-log",  "Show full log",     on_display_full_log)
 	XX ("edit-input",        "Edit input",        on_edit_input)