New command, join-pane, to split and move an existing pane into the space (like

splitw then movep, or the reverse of breakp).

Makefile

@@ -12,7 +12,7 @@ SRCS=	attributes.c cfg.c client.c clock.c \
 	cmd-last-window.c cmd-link-window.c cmd-list-buffers.c \
 	cmd-list-clients.c cmd-list-commands.c cmd-list-keys.c \
 	cmd-list-sessions.c cmd-list-windows.c cmd-list-panes.c \
-	cmd-list.c cmd-load-buffer.c \
+	cmd-list.c cmd-load-buffer.c cmd-join-pane.c \
 	cmd-lock-server.c cmd-lock-client.c cmd-lock-session.c \
 	cmd-move-window.c cmd-new-session.c cmd-new-window.c \
 	cmd-next-layout.c cmd-next-window.c cmd-paste-buffer.c \

cmd-join-pane.c

@@ -0,0 +1,257 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <paths.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "tmux.h"
+
+/*
+ * Join a pane into another (like split/swap/kill).
+ */
+
+int	cmd_join_pane_parse(struct cmd *, int, char **, char **);
+int	cmd_join_pane_exec(struct cmd *, struct cmd_ctx *);
+void	cmd_join_pane_free(struct cmd *);
+void	cmd_join_pane_init(struct cmd *, int);
+size_t	cmd_join_pane_print(struct cmd *, char *, size_t);
+
+struct cmd_join_pane_data {
+	char	*src;
+	char	*dst;
+	int	 flag_detached;
+	int	 flag_horizontal;
+	int	 percentage;
+	int	 size;
+};
+
+const struct cmd_entry cmd_join_pane_entry = {
+	"join-pane", "joinp",
+	"[-dhv] [-p percentage|-l size] [-t src-pane] [-t dst-pane] [command]",
+	0, "",
+	cmd_join_pane_init,
+	cmd_join_pane_parse,
+	cmd_join_pane_exec,
+	cmd_join_pane_free,
+	cmd_join_pane_print
+};
+
+void
+cmd_join_pane_init(struct cmd *self, int key)
+{
+	struct cmd_join_pane_data	 *data;
+
+	self->data = data = xmalloc(sizeof *data);
+	data->src = NULL;
+	data->dst = NULL;
+	data->flag_detached = 0;
+	data->flag_horizontal = 0;
+	data->percentage = -1;
+	data->size = -1;
+
+	switch (key) {
+	case '%':
+		data->flag_horizontal = 1;
+		break;
+	case '"':
+		data->flag_horizontal = 0;
+		break;
+	}
+}
+
+int
+cmd_join_pane_parse(struct cmd *self, int argc, char **argv, char **cause)
+{
+	struct cmd_join_pane_data	*data;
+	int				 opt;
+	const char			*errstr;
+
+	self->entry->init(self, KEYC_NONE);
+	data = self->data;
+
+	while ((opt = getopt(argc, argv, "dhl:p:s:t:v")) != -1) {
+		switch (opt) {
+		case 'd':
+			data->flag_detached = 1;
+			break;
+		case 'h':
+			data->flag_horizontal = 1;
+			break;
+		case 's':
+			if (data->src == NULL)
+				data->src = xstrdup(optarg);
+			break;
+		case 't':
+			if (data->dst == NULL)
+				data->dst = xstrdup(optarg);
+			break;
+		case 'l':
+			if (data->percentage != -1 || data->size != -1)
+				break;
+			data->size = strtonum(optarg, 1, INT_MAX, &errstr);
+			if (errstr != NULL) {
+				xasprintf(cause, "size %s", errstr);
+				goto error;
+			}
+			break;
+		case 'p':
+			if (data->size != -1 || data->percentage != -1)
+				break;
+			data->percentage = strtonum(optarg, 1, 100, &errstr);
+			if (errstr != NULL) {
+				xasprintf(cause, "percentage %s", errstr);
+				goto error;
+			}
+			break;
+		case 'v':
+			data->flag_horizontal = 0;
+			break;
+		default:
+			goto usage;
+		}
+	}
+	argc -= optind;
+	argv += optind;
+	if (argc != 0)
+		goto usage;
+
+	return (0);
+
+usage:
+	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);
+
+error:
+	self->entry->free(self);
+	return (-1);
+}
+
+int
+cmd_join_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_join_pane_data	*data = self->data;
+	struct session			*dst_s;
+	struct winlink			*src_wl, *dst_wl;
+	struct window			*src_w, *dst_w;
+	struct window_pane		*src_wp, *dst_wp;
+	int				 size;
+	enum layout_type		 type;
+	struct layout_cell		*lc;
+
+	if ((dst_wl = cmd_find_pane(ctx, data->dst, &dst_s, &dst_wp)) == NULL)
+		return (-1);
+	dst_w = dst_wl->window;
+
+	if ((src_wl = cmd_find_pane(ctx, data->src, NULL, &src_wp)) == NULL)
+		return (-1);
+	src_w = src_wl->window;
+
+	if (src_w == dst_w) {
+		ctx->error(ctx, "can't join a pane to its own window");
+		return (-1);
+	}
+
+	type = LAYOUT_TOPBOTTOM;
+	if (data->flag_horizontal)
+		type = LAYOUT_LEFTRIGHT;
+
+	size = -1;
+	if (data->size != -1)
+		size = data->size;
+	else if (data->percentage != -1) {
+		if (type == LAYOUT_TOPBOTTOM)
+			size = (dst_wp->sy * data->percentage) / 100;
+		else
+			size = (dst_wp->sx * data->percentage) / 100;
+	}
+
+	if ((lc = layout_split_pane(dst_wp, type, size)) == NULL) {
+		ctx->error(ctx, "create pane failed: pane too small");
+		return (-1);
+	}
+
+	layout_close_pane(src_wp);
+
+	if (src_w->active == src_wp) {
+		src_w->active = TAILQ_PREV(src_wp, window_panes, entry);
+		if (src_w->active == NULL)
+			src_w->active = TAILQ_NEXT(src_wp, entry);
+	}
+	TAILQ_REMOVE(&src_w->panes, src_wp, entry);
+
+	if (window_count_panes(src_w) == 0)
+		server_kill_window(src_w);
+
+	src_wp->window = dst_w;
+	TAILQ_INSERT_AFTER(&dst_w->panes, dst_wp, src_wp, entry);
+	layout_assign_pane(lc, src_wp);
+
+	recalculate_sizes();
+
+	server_redraw_window(src_w);
+	server_redraw_window(dst_w);
+
+	if (!data->flag_detached) {
+		window_set_active_pane(dst_w, src_wp);
+		session_select(dst_s, dst_wl->idx);
+		server_redraw_session(dst_s);
+	} else
+		server_status_session(dst_s);
+
+	return (0);
+}
+
+void
+cmd_join_pane_free(struct cmd *self)
+{
+	struct cmd_join_pane_data	*data = self->data;
+
+	if (data->src != NULL)
+		xfree(data->src);
+	if (data->dst != NULL)
+		xfree(data->dst);
+	xfree(data);
+}
+
+size_t
+cmd_join_pane_print(struct cmd *self, char *buf, size_t len)
+{
+	struct cmd_join_pane_data	*data = self->data;
+	size_t				 off = 0;
+
+	off += xsnprintf(buf, len, "%s", self->entry->name);
+	if (data == NULL)
+		return (off);
+	if (off < len && data->flag_detached)
+		off += xsnprintf(buf + off, len - off, " -d");
+	if (off < len && data->flag_horizontal)
+		off += xsnprintf(buf + off, len - off, " -h");
+	if (off < len && data->size > 0)
+		off += xsnprintf(buf + off, len - off, " -l %d", data->size);
+	if (off < len && data->percentage > 0) {
+		off += xsnprintf(
+		    buf + off, len - off, " -p %d", data->percentage);
+	}
+	if (off < len && data->src != NULL)
+		off += cmd_prarg(buf + off, len - off, " -s ", data->src);
+	if (off < len && data->dst != NULL)
+		off += cmd_prarg(buf + off, len - off, " -t ", data->dst);
+	return (off);
+}

cmd-split-window.c

@@ -149,13 +149,14 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	struct session			*s;
 	struct winlink			*wl;
 	struct window			*w;
-	struct window_pane		*wp, *new_wp;
+	struct window_pane		*wp, *new_wp = NULL;
 	struct environ			 env;
 	char		 		*cmd, *cwd, *cause;
 	const char			*shell;
 	u_int				 hlimit;
 	int				 size;
 	enum layout_type		 type;
+	struct layout_cell		*lc;
 
 	if ((wl = cmd_find_pane(ctx, data->target, &s, &wp)) == NULL)
 		return (-1);
@@ -193,13 +194,15 @@ cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
 	if (*shell == '\0' || areshell(shell))
 		shell = _PATH_BSHELL;
 
-	new_wp = window_add_pane(w, hlimit);
+	if ((lc = layout_split_pane(wp, type, size)) == NULL) {
-	if (window_pane_spawn(new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
-		goto error;
-	if (layout_split_pane(wp, type, size, new_wp) != 0) {
 		cause = xstrdup("pane too small");
 		goto error;
 	}
+	new_wp = window_add_pane(w, hlimit);
+	if (window_pane_spawn(
+	    new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
+		goto error;
+	layout_assign_pane(lc, new_wp);
 
 	server_redraw_window(w);
 

cmd.c

@@ -49,6 +49,7 @@ const struct cmd_entry *cmd_table[] = {
 	&cmd_find_window_entry,
 	&cmd_has_session_entry,
 	&cmd_if_shell_entry,
+	&cmd_join_pane_entry,
 	&cmd_kill_pane_entry,
 	&cmd_kill_server_entry,
 	&cmd_kill_session_entry,

layout.c

@@ -485,10 +485,20 @@ layout_resize_pane_shrink(
 	return (size);
 }
 
-/* Split a pane into two. size is a hint, or -1 for default half/half split. */
+/* Assign window pane to newly split cell. */
-int
+void
-layout_split_pane(struct window_pane *wp,
+layout_assign_pane(struct layout_cell *lc, struct window_pane *wp)
-    enum layout_type type, int size, struct window_pane *new_wp)
+{
+	layout_make_leaf(lc, wp);
+	layout_fix_panes(wp->window, wp->window->sx, wp->window->sy);
+}
+
+/*
+ * Split a pane into two. size is a hint, or -1 for default half/half
+ * 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)
 {
 	struct layout_cell     *lc, *lcparent, *lcnew;
 	u_int			sx, sy, xoff, yoff, size1, size2;
@@ -505,11 +515,11 @@ layout_split_pane(struct window_pane *wp,
 	switch (type) {
 	case LAYOUT_LEFTRIGHT:
 		if (sx < PANE_MINIMUM * 2 + 1)
-			return (-1);
+			return (NULL);
 		break;
 	case LAYOUT_TOPBOTTOM:
 		if (sy < PANE_MINIMUM * 2 + 1)
-			return (-1);
+			return (NULL);
 		break;
 	default:
 		fatalx("bad layout type");
@@ -583,12 +593,8 @@ layout_split_pane(struct window_pane *wp,
 
 	/* Assign the panes. */
 	layout_make_leaf(lc, wp);
-	layout_make_leaf(lcnew, new_wp);
 
-	/* Fix pane offsets and sizes. */
+	return (lcnew);
-	layout_fix_panes(wp->window, wp->window->sx, wp->window->sy);
-
-	return (0);
 }
 
 /* Destroy the layout associated with a pane and redistribute the space. */

tmux.1

@@ -767,6 +767,24 @@ If only one window is matched, it'll be automatically selected, otherwise a
 choice list is shown.
 This command only works from inside
 .Nm .
+.It Xo Ic join-pane
+.Op Fl dhv
+.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 joinp )
+Like
+.Ic split-window ,
+but instead of splitting
+.Ar dst-pane
+and creating a new pane, split it and move
+.Ar src-pane
+into the space.
+This can be used to reverse
+.Ic break-pane .
 .It Xo Ic kill-pane
 .Op Fl a
 .Op Fl t Ar target-pane

tmux.h

@@ -1437,6 +1437,7 @@ extern const struct cmd_entry cmd_down_pane_entry;
 extern const struct cmd_entry cmd_find_window_entry;
 extern const struct cmd_entry cmd_has_session_entry;
 extern const struct cmd_entry cmd_if_shell_entry;
+extern const struct cmd_entry cmd_join_pane_entry;
 extern const struct cmd_entry cmd_kill_pane_entry;
 extern const struct cmd_entry cmd_kill_server_entry;
 extern const struct cmd_entry cmd_kill_session_entry;
@@ -1833,8 +1834,9 @@ void		 layout_free(struct window *);
 void		 layout_resize(struct window *, u_int, u_int);
 void		 layout_resize_pane(
 		     struct window_pane *, enum layout_type, int);
-int		 layout_split_pane(struct window_pane *,
+void		 layout_assign_pane(struct layout_cell *, struct window_pane *);
-		     enum layout_type, int, struct window_pane *);
+struct layout_cell *layout_split_pane(
+		     struct window_pane *, enum layout_type, int);
 void		 layout_close_pane(struct window_pane *);
 
 /* layout-set.c */