Add a command queue to standardize and simplify commands that call other

commands and allow a command to block execution of subsequent
commands. This allows run-shell and if-shell to be synchronous which has
been much requested.

Each client has a default command queue and commands are consumed one at
a time from it. A command may suspend execution from the queue by
returning CMD_RETURN_WAIT and then resume it by calling cmd_continue() -
for example run-shell does this from the callback that is fired after
the job is freed.

When the command queue becomes empty, command clients are automatically
exited (unless attaching). A callback is also fired - this is used for
nested commands in, for example, if-shell which can block execution of
the client's cmdq until a new cmdq becomes empty.

Also merge all the old error/info/print functions together and lose the
old curclient/cmdclient distinction - a cmdq is bound to one client (or
none if in the configuration file), this is a command client if
c->session is NULL otherwise an attached client.

1 files changed, 22 insertions, 3 deletions

diff --git a/cmd-send-keys.c b/cmd-send-keys.c
index f6124d3a..3ee3dbe6 100644
--- a/cmd-send-keys.c
+++ b/cmd-send-keys.c
@@ -27,7 +27,7 @@
  * Send keys to client.
  */
 
-enum cmd_retval	 cmd_send_keys_exec(struct cmd *, struct cmd_ctx *);
+enum cmd_retval	 cmd_send_keys_exec(struct cmd *, struct cmd_q *);
 
 const struct cmd_entry cmd_send_keys_entry = {
 	"send-keys", "send",
@@ -39,8 +39,18 @@ const struct cmd_entry cmd_send_keys_entry = {
 	cmd_send_keys_exec
 };
 
+const struct cmd_entry cmd_send_prefix_entry = {
+	"send-prefix", NULL,
+	"2t:", 0, 0,
+	"[-2] " CMD_TARGET_PANE_USAGE,
+	0,
+	NULL,
+	NULL,
+	cmd_send_keys_exec
+};
+
 enum cmd_retval
-cmd_send_keys_exec(struct cmd *self, struct cmd_ctx *ctx)
+cmd_send_keys_exec(struct cmd *self, struct cmd_q *cmdq)
 {
 	struct args		*args = self->args;
 	struct window_pane	*wp;
@@ -49,9 +59,18 @@ cmd_send_keys_exec(struct cmd *self, struct cmd_ctx *ctx)
 	const char		*str;
 	int			 i, key;
 
-	if (cmd_find_pane(ctx, args_get(args, 't'), &s, &wp) == NULL)
+	if (cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp) == NULL)
 		return (CMD_RETURN_ERROR);
 
+	if (self->entry == &cmd_send_prefix_entry) {
+		if (args_has(args, '2'))
+			key = options_get_number(&s->options, "prefix2");
+		else
+			key = options_get_number(&s->options, "prefix");
+		window_pane_key(wp, s, key);
+		return (CMD_RETURN_NORMAL);
+	}
+
 	if (args_has(args, 'R')) {
 		ictx = &wp->ictx;