Add "grouped sessions" which have independent name, options, current window and

so on but where the linked windows are synchronized (ie creating, killing
windows and so on are mirrored between the sessions). A grouped session may be
created by passing -t to new-session.

Had this around for a while, tested by a couple of people.

1 files changed, 31 insertions, 5 deletions

diff --git a/cmd-new-session.c b/cmd-new-session.c
index 2aafdb1b..4889ab4b 100644
--- a/cmd-new-session.c
+++ b/cmd-new-session.c
@@ -34,6 +34,7 @@ void	cmd_new_session_init(struct cmd *, int);
 size_t	cmd_new_session_print(struct cmd *, char *, size_t);
 
 struct cmd_new_session_data {
+	char	*target;
 	char	*newname;
 	char	*winname;
 	char	*cmd;
@@ -42,7 +43,7 @@ struct cmd_new_session_data {
 
 const struct cmd_entry cmd_new_session_entry = {
 	"new-session", "new",
-	"[-d] [-n window-name] [-s session-name] [command]",
+	"[-d] [-n window-name] [-s session-name] [-t target-session] [command]",
 	CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON, 0,
 	cmd_new_session_init,
 	cmd_new_session_parse,
@@ -58,6 +59,7 @@ cmd_new_session_init(struct cmd *self, unused int arg)
 
 	self->data = data = xmalloc(sizeof *data);
 	data->flag_detached = 0;
+	data->target = NULL;
 	data->newname = NULL;
 	data->winname = NULL;
 	data->cmd = NULL;
@@ -72,7 +74,7 @@ cmd_new_session_parse(struct cmd *self, int argc, char **argv, char **cause)
 	self->entry->init(self, KEYC_NONE);
 	data = self->data;
 
-	while ((opt = getopt(argc, argv, "ds:n:")) != -1) {
+	while ((opt = getopt(argc, argv, "ds:t:n:")) != -1) {
 		switch (opt) {
 		case 'd':
 			data->flag_detached = 1;
@@ -81,6 +83,10 @@ cmd_new_session_parse(struct cmd *self, int argc, char **argv, char **cause)
 			if (data->newname == NULL)
 				data->newname = xstrdup(optarg);
 			break;
+		case 't':
+			if (data->target == NULL)
+				data->target = xstrdup(optarg);
+			break;
 		case 'n':
 			if (data->winname == NULL)
 				data->winname = xstrdup(optarg);
@@ -94,6 +100,9 @@ cmd_new_session_parse(struct cmd *self, int argc, char **argv, char **cause)
 	if (argc != 0 && argc != 1)
 		goto usage;
 
+	if (data->target != NULL && (argc == 1 || data->winname != NULL))
+		goto usage;
+
 	if (argc == 1)
 		data->cmd = xstrdup(argv[0]);
 
@@ -110,7 +119,7 @@ int
 cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 {
 	struct cmd_new_session_data	*data = self->data;
-	struct session			*s;
+	struct session			*s, *groupwith;
 	struct window			*w;
 	struct environ			 env;
 	struct termios			 tio, *tiop;
@@ -124,6 +133,11 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 		return (-1);
 	}
 
+	groupwith = NULL;
+	if (data->target != NULL &&
+	    (groupwith = cmd_find_session(ctx, data->target)) == NULL)
+		return (-1);
+
 	/*
 	 * There are three cases:
 	 *
@@ -204,7 +218,9 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 		sy = 1;
 
 	/* Figure out the command for the new window. */
-	if (data->cmd != NULL)
+	if (data->target != NULL)
+		cmd = NULL;
+	else if (data->cmd != NULL)
 		cmd = data->cmd;
 	else
 		cmd = options_get_string(&global_s_options, "default-command");
@@ -227,7 +243,7 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 	environ_free(&env);
 
 	/* Set the initial window name if one given. */
-	if (data->winname != NULL) {
+	if (cmd != NULL && data->winname != NULL) {
 		w = s->curw->window;
 
 		xfree(w->name);
@@ -237,6 +253,16 @@ cmd_new_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 	}
 
 	/*
+	 * If a target session is given, this is to be part of a session group,
+	 * so add it to the group and synchronize.
+	 */
+	if (groupwith != NULL) {
+		session_group_add(groupwith, s);
+		session_group_synchronize_to(s);
+		session_select(s, RB_ROOT(&s->windows)->idx);
+	}
+
+	/*
 	 * Set the client to the new session. If a command client exists, it is
 	 * taking this session and needs to get MSG_READY and stay around.
 	 */