degesch: implement /buffer move

2 files changed, 42 insertions, 5 deletions

diff --git a/common.c b/common.c
index fab0205..3d40816 100644
--- a/common.c
+++ b/common.c
@@ -49,6 +49,15 @@
 
 // --- To be moved to liberty --------------------------------------------------
 
+#define LIST_INSERT_WITH_TAIL(head, tail, link, following)                     \
+	BLOCK_START                                                                \
+		if (following)                                                         \
+			LIST_APPEND_WITH_TAIL ((head), (following)->prev, (link));         \
+		else                                                                   \
+			LIST_APPEND_WITH_TAIL ((head), (tail), (link));                    \
+		(link)->next = (following);                                            \
+	BLOCK_END
+
 static void
 split_str (const char *s, char delimiter, struct str_vector *out)
 {
diff --git a/degesch.c b/degesch.c
index 7e8b8b4..b103d6b 100644
--- a/degesch.c
+++ b/degesch.c
@@ -5937,6 +5937,37 @@ handle_buffer_close (struct app_context *ctx, struct handler_args *a)
 }
 
 static bool
+handle_buffer_move (struct app_context *ctx, struct handler_args *a)
+{
+	unsigned long request;
+	if (!xstrtoul (&request, a->arguments, 10))
+		return false;
+
+	unsigned long total = 0;
+	LIST_FOR_EACH (struct buffer, iter, ctx->buffers)
+		total++;
+
+	if (request == 0 || request > total)
+	{
+		buffer_send_error (ctx, NULL, "%s: %s",
+			"Can't move buffer", "requested position is out of range");
+		return true;
+	}
+
+	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;
+}
+
+static bool
 handle_command_buffer (struct app_context *ctx, struct handler_args *a)
 {
 	char *action = cut_word (&a->arguments);
@@ -5954,10 +5985,7 @@ handle_command_buffer (struct app_context *ctx, struct handler_args *a)
 		buffer_print_backlog (ctx, a->buffer);
 	}
 	else if (!strcasecmp_ascii (action, "move"))
-	{
-		// TODO: unlink the buffer and link it back at index;
-		//   we will probably need to extend liberty for this
-	}
+		handle_buffer_move (ctx, a);
 	else if (!strcasecmp_ascii (action, "close"))
 		handle_buffer_close (ctx, a);
 	else
@@ -6724,7 +6752,7 @@ g_command_handlers[] =
 	  "[<message>]",
 	  handle_command_quit,       0 },
 	{ "buffer",     "Manage buffers",
-	  "list | clear | move | { close [<number> | <name>] } | <number>",
+	  "<N> | list | clear | move <N> | close [<N> | <name>]",
 	  handle_command_buffer,     0 },
 	{ "set",        "Manage configuration",
 	  "[<option>]",