Add move-pane command (like join-pane but allows the same window). Also

-b flag to join-pane and move-pane to place the pane to the left or
above. From George Nachman.

cmd-join-pane.c

@@ -1,6 +1,7 @@
 /* $OpenBSD$ */
 
 /*
+ * Copyright (c) 2011 George Nachman <tmux@georgester.com>
  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
  *
  * Permission to use, copy, modify, and distribute this software for any
@@ -25,22 +26,34 @@
 #include "tmux.h"
 
 /*
- * Join a pane into another (like split/swap/kill).
+ * Join or move a pane into another (like split/swap/kill).
  */
 
 void	cmd_join_pane_key_binding(struct cmd *, int);
 int	cmd_join_pane_exec(struct cmd *, struct cmd_ctx *);
 
+int	join_pane(struct cmd *, struct cmd_ctx *, int);
+
 const struct cmd_entry cmd_join_pane_entry = {
 	"join-pane", "joinp",
-	"dhvp:l:s:t:", 0, 0,
+	"bdhvp:l:s:t:", 0, 0,
-	"[-dhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
+	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
 	0,
 	cmd_join_pane_key_binding,
 	NULL,
 	cmd_join_pane_exec
 };
 
+const struct cmd_entry cmd_move_pane_entry = {
+	"move-pane", "movep",
+	"bdhvp:l:s:t:", 0, 0,
+	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
+	0,
+	NULL,
+	NULL,
+	cmd_join_pane_exec
+};
+
 void
 cmd_join_pane_key_binding(struct cmd *self, int key)
 {
@@ -57,6 +70,12 @@ cmd_join_pane_key_binding(struct cmd *self, int key)
 
 int
 cmd_join_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	return join_pane(self, ctx, self->entry == &cmd_join_pane_entry);
+}
+
+int
+join_pane(struct cmd *self, struct cmd_ctx *ctx, int not_same_window)
 {
 	struct args		*args = self->args;
 	struct session		*dst_s;
@@ -79,10 +98,14 @@ cmd_join_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	src_w = src_wl->window;
 
-	if (src_w == dst_w) {
+	if (not_same_window && src_w == dst_w) {
 		ctx->error(ctx, "can't join a pane to its own window");
 		return (-1);
 	}
+	if (!not_same_window && src_wp == dst_wp) {
+		ctx->error(ctx, "source and target panes must be different");
+		return (-1);
+	}
 
 	type = LAYOUT_TOPBOTTOM;
 	if (args_has(args, 'h'))
@@ -108,8 +131,8 @@ cmd_join_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
 		else
 			size = (dst_wp->sx * percentage) / 100;
 	}
-
+	lc = layout_split_pane(dst_wp, type, size, args_has(args, 'b'));
-	if ((lc = layout_split_pane(dst_wp, type, size)) == NULL) {
+	if (lc == NULL) {
 		ctx->error(ctx, "create pane failed: pane too small");
 		return (-1);
 	}

cmd-split-window.c

@@ -113,7 +113,7 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if (*shell == '\0' || areshell(shell))
 		shell = _PATH_BSHELL;
 
-	if ((lc = layout_split_pane(wp, type, size)) == NULL) {
+	if ((lc = layout_split_pane(wp, type, size, 0)) == NULL) {
 		cause = xstrdup("pane too small");
 		goto error;
 	}

cmd.c

@@ -68,6 +68,7 @@ const struct cmd_entry *cmd_table[] = {
 	&cmd_lock_client_entry,
 	&cmd_lock_server_entry,
 	&cmd_lock_session_entry,
+	&cmd_move_pane_entry,
 	&cmd_move_window_entry,
 	&cmd_new_session_entry,
 	&cmd_new_window_entry,

layout.c

@@ -616,9 +616,10 @@ layout_assign_pane(struct layout_cell *lc, struct window_pane *wp)
  * split. This must be followed by layout_assign_pane before much else happens!
  **/
 struct layout_cell *
-layout_split_pane(struct window_pane *wp, enum layout_type type, int size)
+layout_split_pane(
+    struct window_pane *wp, enum layout_type type, int size, int insert_before)
 {
-	struct layout_cell     *lc, *lcparent, *lcnew;
+	struct layout_cell     *lc, *lcparent, *lcnew, *lc1, *lc2;
 	u_int			sx, sy, xoff, yoff, size1, size2;
 
 	lc = wp->layout_cell;
@@ -650,8 +651,12 @@ layout_split_pane(struct window_pane *wp, enum layout_type type, int size)
 		 */
 
 		/* Create the new child cell. */
-		lcnew = layout_create_cell(lc->parent);
+		lcparent = lc->parent;
-		TAILQ_INSERT_AFTER(&lc->parent->cells, lc, lcnew, entry);
+		lcnew = layout_create_cell(lcparent);
+		if (insert_before)
+			TAILQ_INSERT_BEFORE(lc, lcnew, entry);
+		else
+			TAILQ_INSERT_AFTER(&lcparent->cells, lc, lcnew, entry);
 	} else {
 		/*
 		 * Otherwise create a new parent and insert it.
@@ -672,7 +677,17 @@ layout_split_pane(struct window_pane *wp, enum layout_type type, int size)
 
 		/* Create the new child cell. */
 		lcnew = layout_create_cell(lcparent);
-		TAILQ_INSERT_TAIL(&lcparent->cells, lcnew, entry);
+		if (insert_before)
+			TAILQ_INSERT_HEAD(&lcparent->cells, lcnew, entry);
+		else
+			TAILQ_INSERT_TAIL(&lcparent->cells, lcnew, entry);
+	}
+	if (insert_before) {
+		lc1 = lcnew;
+		lc2 = lc;
+	} else {
+		lc1 = lc;
+		lc2 = lcnew;
 	}
 
 	/* Set new cell sizes.  size is the target size or -1 for middle split,
@@ -689,8 +704,8 @@ layout_split_pane(struct window_pane *wp, enum layout_type type, int size)
 		else if (size2 > sx - 2)
 			size2 = sx - 2;
 		size1 = sx - 1 - size2;
-		layout_set_size(lc, size1, sy, xoff, yoff);
+		layout_set_size(lc1, size1, sy, xoff, yoff);
-		layout_set_size(lcnew, size2, sy, xoff + lc->sx + 1, yoff);
+		layout_set_size(lc2, size2, sy, xoff + lc1->sx + 1, yoff);
 		break;
 	case LAYOUT_TOPBOTTOM:
 		if (size < 0)
@@ -702,8 +717,8 @@ layout_split_pane(struct window_pane *wp, enum layout_type type, int size)
 		else if (size2 > sy - 2)
 			size2 = sy - 2;
 		size1 = sy - 1 - size2;
-		layout_set_size(lc, sx, size1, xoff, yoff);
+		layout_set_size(lc1, sx, size1, xoff, yoff);
-		layout_set_size(lcnew, sx, size2, xoff, yoff + lc->sy + 1);
+		layout_set_size(lc2, sx, size2, xoff, yoff + lc1->sy + 1);
 		break;
 	default:
 		fatalx("bad layout type");

tmux.1

@@ -1105,7 +1105,7 @@ choice list is shown.
 This command only works from inside
 .Nm .
 .It Xo Ic join-pane
-.Op Fl dhv
+.Op Fl bdhv
 .Oo Fl l
 .Ar size |
 .Fl p Ar percentage Oc
@@ -1122,6 +1122,12 @@ and creating a new pane, split it and move
 into the space.
 This can be used to reverse
 .Ic break-pane .
+The
+.Fl b
+option causes
+.Ar src-pane
+to be joined to left of or above
+.Ar dst-pane .
 .It Xo Ic kill-pane
 .Op Fl a
 .Op Fl t Ar target-pane
@@ -1210,6 +1216,22 @@ For the meaning of the
 flag, see the
 .Sx FORMATS
 section.
+.It Xo Ic move-pane
+.Op Fl bdhv
+.Oo Fl l
+.Ar size |
+.Fl p Ar percentage Oc
+.Op Fl s Ar src-pane
+.Op Fl t Ar dst-pane
+.Xc
+.D1 (alias: Ic movep )
+Like
+.Ic join-pane ,
+but
+.Ar src-pane
+and
+.Ar dst-pane
+may belong to the same window.
 .It Xo Ic move-window
 .Op Fl dk
 .Op Fl s Ar src-window

tmux.h

@@ -1605,6 +1605,7 @@ extern const struct cmd_entry cmd_load_buffer_entry;
 extern const struct cmd_entry cmd_lock_client_entry;
 extern const struct cmd_entry cmd_lock_server_entry;
 extern const struct cmd_entry cmd_lock_session_entry;
+extern const struct cmd_entry cmd_move_pane_entry;
 extern const struct cmd_entry cmd_move_window_entry;
 extern const struct cmd_entry cmd_new_session_entry;
 extern const struct cmd_entry cmd_new_window_entry;
@@ -1999,7 +2000,7 @@ void		 layout_resize_pane_mouse(
 		     struct client *c, struct mouse_event *mouse);
 void		 layout_assign_pane(struct layout_cell *, struct window_pane *);
 struct layout_cell *layout_split_pane(
-		     struct window_pane *, enum layout_type, int);
+		     struct window_pane *, enum layout_type, int, int);
 void		 layout_close_pane(struct window_pane *);
 
 /* layout-custom.c */