Add a respawn-pane command, from Marcel Partap.

Makefile

@@ -16,7 +16,7 @@ SRCS=	arguments.c attributes.c cfg.c client.c clock.c \
 	cmd-lock-server.c \
 	cmd-move-window.c cmd-new-session.c cmd-new-window.c \
 	cmd-paste-buffer.c \
-	cmd-refresh-client.c \
+	cmd-refresh-client.c cmd-respawn-pane.c \
 	cmd-rename-session.c cmd-rename-window.c cmd-resize-pane.c \
 	cmd-respawn-window.c cmd-rotate-window.c cmd-save-buffer.c \
 	cmd-select-layout.c cmd-select-pane.c cmd-select-window.c \

cmd-respawn-pane.c

@@ -0,0 +1,92 @@
+/* $Id$ */
+
+/*
+ * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
+ * Copyright (c) 2011 Marcel P. Partap <mpartap@gmx.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 <unistd.h>
+
+#include "tmux.h"
+
+/*
+ * Respawn a pane (restart the command). Kill existing if -k given.
+ */
+
+int	cmd_respawn_pane_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_respawn_pane_entry = {
+	"respawn-pane", "respawnp",
+	"kt:", 0, 1,
+	"[-k] " CMD_TARGET_PANE_USAGE " [command]",
+	0,
+	NULL,
+	NULL,
+	cmd_respawn_pane_exec
+};
+
+int
+cmd_respawn_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct args		*args = self->args;
+	struct winlink		*wl;
+	struct window		*w;
+	struct window_pane	*wp;
+	u_int			 hlimit;
+	struct session		*s;
+	struct environ		 env;
+	const char		*cmd;
+	char		 	*cause;
+
+	if ((wl = cmd_find_pane(ctx, args_get(args, 't'), &s, &wp)) == NULL)
+		return (-1);
+	w = wl->window;
+
+	if (!args_has(self->args, 'k') && wp->fd != -1) {
+		ctx->error(ctx, "pane still active: %s:%u.%u",
+		    s->name, wl->idx, window_pane_index(w, wp));
+		return (-1);
+	}
+
+	environ_init(&env);
+	environ_copy(&global_environ, &env);
+	environ_copy(&s->environ, &env);
+	server_fill_environ(s, &env);
+
+	window_pane_reset_mode(wp);
+	screen_free(&wp->base);
+	hlimit = options_get_number(&s->options, "history-limit");
+	screen_init(&wp->base, wp->sx, wp->sy, hlimit);
+	wp->screen = &wp->base;
+	input_init(wp);
+
+	if (args->argc != 0)
+		cmd = args->argv[0];
+	else
+		cmd = NULL;
+	if (window_pane_spawn(wp, cmd, NULL, NULL, &env, s->tio, &cause) != 0) {
+		ctx->error(ctx, "respawn pane failed: %s", cause);
+		xfree(cause);
+		environ_free(&env);
+		return (-1);
+	}
+	wp->flags |= PANE_REDRAW;
+	server_status_window(w);
+
+	environ_free(&env);
+	return (0);
+}

cmd.c

@@ -80,6 +80,7 @@ const struct cmd_entry *cmd_table[] = {
 	&cmd_rename_session_entry,
 	&cmd_rename_window_entry,
 	&cmd_resize_pane_entry,
+	&cmd_respawn_pane_entry,
 	&cmd_respawn_window_entry,
 	&cmd_rotate_window_entry,
 	&cmd_run_shell_entry,

tmux.1

@@ -1307,6 +1307,21 @@ and to the right with
 The
 .Ar adjustment
 is given in lines or cells (the default is 1).
+.It Xo Ic respawn-pane
+.Op Fl k
+.Op Fl t Ar target-pane
+.Op Ar shell-command
+.Xc
+.D1 (alias: Ic respawnp )
+Reactivate a pane in which the command has exited (see the
+.Ic remain-on-exit
+window option).
+If
+.Ar shell-command
+is not given, the command used when the pane was created is executed.
+The pane must be already inactive, unless
+.Fl k
+is given, in which case any existing command is killed.
 .It Xo Ic respawn-window
 .Op Fl k
 .Op Fl t Ar target-window

tmux.h

@@ -1584,6 +1584,7 @@ extern const struct cmd_entry cmd_refresh_client_entry;
 extern const struct cmd_entry cmd_rename_session_entry;
 extern const struct cmd_entry cmd_rename_window_entry;
 extern const struct cmd_entry cmd_resize_pane_entry;
+extern const struct cmd_entry cmd_respawn_pane_entry;
 extern const struct cmd_entry cmd_respawn_window_entry;
 extern const struct cmd_entry cmd_rotate_window_entry;
 extern const struct cmd_entry cmd_run_shell_entry;