degesch: add fast buffer switching

When the user tries to M-n the same buffer, it switches to the last.

1 files changed, 14 insertions, 1 deletions

diff --git a/degesch.c b/degesch.c
index f6827ed..1d5e3ee 100644
--- a/degesch.c
+++ b/degesch.c
@@ -482,6 +482,8 @@ struct app_context
 	struct buffer *buffers;             ///< All our buffers in order
 	struct buffer *buffers_tail;        ///< The tail of our buffers
 
+	struct buffer *last_buffer;         ///< Last used buffer
+
 	// XXX: when we go multiserver, there will be collisions
 	// TODO: make buffer names unique like weechat does
 	struct str_map buffers_by_name;     ///< Excludes GLOBAL and SERVER
@@ -1425,6 +1427,9 @@ buffer_remove (struct app_context *ctx, struct buffer *buffer)
 	LIST_UNLINK_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
 	buffer_destroy (buffer);
 
+	if (buffer == ctx->last_buffer)
+		ctx->last_buffer = NULL;
+
 	// It's not a good idea to remove these buffers, but it's even a worse
 	// one to leave the pointers point to invalid memory
 	if (buffer == ctx->global_buffer)
@@ -1515,6 +1520,7 @@ buffer_activate (struct app_context *ctx, struct buffer *buffer)
 	}
 
 	// Now at last we can switch the pointers
+	ctx->last_buffer = ctx->current_buffer;
 	ctx->current_buffer = buffer;
 
 	refresh_prompt (ctx);
@@ -2178,8 +2184,15 @@ on_readline_goto_buffer (int count, int key)
 	if (n < 0 || n > 9)
 		return 0;
 
+	// There's no buffer zero
+	if (n == 0)
+		n = 10;
+
 	struct app_context *ctx = g_ctx;
-	if (!buffer_goto (ctx, n == 0 ? 10 : n))
+	if (ctx->last_buffer && buffer_get_index (ctx, ctx->current_buffer) == n)
+		// Fast switching between two buffers
+		buffer_activate (ctx, ctx->last_buffer);
+	else if (!buffer_goto (ctx, n == 0 ? 10 : n))
 		rl_ding ();
 	return 0;
 }