From 9f75635596d0a01282156eb9e17fde6f4205c05c Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Fri, 3 May 2019 20:44:24 +0000
Subject: Allow panes to be empty (no command), output can be piped to them
 with split-window or display-message -I.

---
 cmd-split-window.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

(limited to 'cmd-split-window.c')

diff --git a/cmd-split-window.c b/cmd-split-window.c
index 3b9040dc..d004aa95 100644
--- a/cmd-split-window.c
+++ b/cmd-split-window.c
@@ -40,9 +40,10 @@ const struct cmd_entry cmd_split_window_entry = {
 	.name = "split-window",
 	.alias = "splitw",
 
-	.args = { "bc:de:fF:l:hp:Pt:v", 0, -1 },
-	.usage = "[-bdefhvP] [-c start-directory] [-e environment] [-F format] "
-		 "[-p percentage|-l size] " CMD_TARGET_PANE_USAGE " [command]",
+	.args = { "bc:de:fF:hIl:p:Pt:v", 0, -1 },
+	.usage = "[-bdefhIPv] [-c start-directory] [-e environment] "
+		 "[-F format] [-p percentage|-l size] " CMD_TARGET_PANE_USAGE
+		 " [command]",
 
 	.target = { 't', CMD_FIND_PANE, 0 },
 
@@ -63,7 +64,7 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 	enum layout_type	 type;
 	struct layout_cell	*lc;
 	struct cmd_find_state	 fs;
-	int			 size, percentage, flags;
+	int			 size, percentage, flags, input;
 	const char		*template, *add;
 	char			*cause, *cp;
 	struct args_value	*value;
@@ -94,12 +95,15 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 		size = -1;
 
 	server_unzoom_window(wp->window);
+	input = (args_has(args, 'I') && args->argc == 0);
 
 	flags = 0;
 	if (args_has(args, 'b'))
 		flags |= SPAWN_BEFORE;
 	if (args_has(args, 'f'))
 		flags |= SPAWN_FULLSIZE;
+	if (input || (args->argc == 1 && *args->argv[0] == '\0'))
+		flags |= SPAWN_EMPTY;
 
 	lc = layout_split_pane(wp, type, size, flags);
 	if (lc == NULL) {
@@ -134,10 +138,18 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 		sc.flags |= SPAWN_DETACHED;
 
 	if ((new_wp = spawn_pane(&sc, &cause)) == NULL) {
+		layout_close_pane(new_wp);
 		cmdq_error(item, "create pane failed: %s", cause);
 		free(cause);
 		return (CMD_RETURN_ERROR);
 	}
+	if (input && window_pane_start_input(new_wp, item, &cause) != 0) {
+		layout_close_pane(new_wp);
+		window_remove_pane(wp->window, new_wp);
+		cmdq_error(item, "%s", cause);
+		free(cause);
+		return (CMD_RETURN_ERROR);
+	}
 	if (!args_has(args, 'd'))
 		cmd_find_from_winlink_pane(current, wl, new_wp, 0);
 	server_redraw_window(wp->window);
@@ -155,5 +167,7 @@ cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
 	cmdq_insert_hook(s, item, &fs, "after-split-window");
 
 	environ_free(sc.environ);
+	if (input)
+		return (CMD_RETURN_WAIT);
 	return (CMD_RETURN_NORMAL);
 }
-- 
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