Add -A flag to new-session to make it behave like attach-session if the

session exists. If -A is used, -D behaves like -d to attach-session.

cmd-attach-session.c

@@ -39,9 +39,8 @@ const struct cmd_entry cmd_attach_session_entry = {
 };
 
 enum cmd_retval
-cmd_attach_session_exec(struct cmd *self, struct cmd_q *cmdq)
+cmd_attach_session(struct cmd_q *cmdq, const char* tflag, int dflag, int rflag)
 {
-	struct args	*args = self->args;
 	struct session	*s;
 	struct client	*c;
 	const char	*update;
@@ -53,14 +52,14 @@ cmd_attach_session_exec(struct cmd *self, struct cmd_q *cmdq)
 		return (CMD_RETURN_ERROR);
 	}
 
-	if ((s = cmd_find_session(cmdq, args_get(args, 't'), 1)) == NULL)
+	if ((s = cmd_find_session(cmdq, tflag, 1)) == NULL)
 		return (CMD_RETURN_ERROR);
 
 	if (cmdq->client == NULL)
 		return (CMD_RETURN_NORMAL);
 
 	if (cmdq->client->session != NULL) {
-		if (args_has(self->args, 'd')) {
+		if (dflag) {
 			/*
 			 * Can't use server_write_session in case attaching to
 			 * the same session as currently attached to.
@@ -87,10 +86,10 @@ cmd_attach_session_exec(struct cmd *self, struct cmd_q *cmdq)
 			return (CMD_RETURN_ERROR);
 		}
 
-		if (args_has(self->args, 'r'))
+		if (rflag)
 			cmdq->client->flags |= CLIENT_READONLY;
 
-		if (args_has(self->args, 'd'))
+		if (dflag)
 			server_write_session(s, MSG_DETACH, NULL, 0);
 
 		update = options_get_string(&s->options, "update-environment");
@@ -110,3 +109,12 @@ cmd_attach_session_exec(struct cmd *self, struct cmd_q *cmdq)
 
 	return (CMD_RETURN_NORMAL);
 }
+
+enum cmd_retval
+cmd_attach_session_exec(struct cmd *self, struct cmd_q *cmdq)
+{
+	struct args	*args = self->args;
+
+	return (cmd_attach_session(cmdq, args_get(args, 't'),
+	    args_has(args, 'd'), args_has(args, 'r')));
+}

cmd-new-session.c

@@ -35,8 +35,8 @@ enum cmd_retval	 cmd_new_session_exec(struct cmd *, struct cmd_q *);
 
 const struct cmd_entry cmd_new_session_entry = {
 	"new-session", "new",
-	"dn:s:t:x:y:", 0, 1,
-	"[-d] [-n window-name] [-s session-name] " CMD_TARGET_SESSION_USAGE
+	"AdDn:s:t:x:y:", 0, 1,
+	"[-AdD] [-n window-name] [-s session-name] " CMD_TARGET_SESSION_USAGE
 	" [-x width] [-y height] [command]",
 	CMD_STARTSERVER|CMD_CANTNEST|CMD_SENDENVIRON,
 	NULL,
@@ -76,6 +76,10 @@ cmd_new_session_exec(struct cmd *self, struct cmd_q *cmdq)
 			return (CMD_RETURN_ERROR);
 		}
 		if (session_find(newname) != NULL) {
+			if (args_has(args, 'A')) {
+				return (cmd_attach_session(cmdq, newname,
+				    args_has(args, 'D'), 0));
+			}
 			cmdq_error(cmdq, "duplicate session: %s", newname);
 			return (CMD_RETURN_ERROR);
 		}

tmux.1

@@ -666,7 +666,7 @@ command.
 Lock all clients attached to
 .Ar target-session .
 .It Xo Ic new-session
-.Op Fl d
+.Op Fl AdD
 .Op Fl n Ar window-name
 .Op Fl s Ar session-name
 .Op Fl t Ar target-session
@@ -697,6 +697,21 @@ If run from a terminal, any
 .Xr termios 4
 special characters are saved and used for new windows in the new session.
 .Pp
+The
+.Fl A
+flag makes
+.Ic new-session
+behave like
+.Ic attach-session
+if
+.Ar session-name
+already exists; in the case,
+.Fl D
+behaves like
+.Fl d
+to
+.Ic attach-session .
+.Pp
 If
 .Fl t
 is given, the new session is
@@ -1568,7 +1583,7 @@ Rename the current window, or the window at
 if specified, to
 .Ar new-name .
 .It Xo Ic resize-pane
-.Op Fl DLRU
+.Op Fl DLRUZ
 .Op Fl t Ar target-pane
 .Op Fl x Ar width
 .Op Fl y Ar height
@@ -1592,6 +1607,11 @@ or
 The
 .Ar adjustment
 is given in lines or cells (the default is 1).
+.Pp
+With
+.Fl Z ,
+the active pane is toggled between occupying the whole of the window and its
+normal position in the layout.
 .It Xo Ic respawn-pane
 .Op Fl k
 .Op Fl t Ar target-pane

tmux.h

@@ -929,7 +929,9 @@ struct window_pane {
 	u_int		 id;
 
 	struct window	*window;
+
 	struct layout_cell *layout_cell;
+	struct layout_cell *saved_layout_cell;
 
 	u_int		 sx;
 	u_int		 sy;
@@ -994,6 +996,7 @@ struct window {
 
 	int		 lastlayout;
 	struct layout_cell *layout_root;
+	struct layout_cell *saved_layout_root;
 
 	u_int		 sx;
 	u_int		 sy;
@@ -1003,6 +1006,7 @@ struct window {
 #define WINDOW_ACTIVITY 0x2
 #define WINDOW_REDRAW 0x4
 #define WINDOW_SILENCE 0x8
+#define WINDOW_ZOOMED 0x10
 
 	struct options	 options;
 
@@ -1836,6 +1840,9 @@ extern const struct cmd_entry cmd_unbind_key_entry;
 extern const struct cmd_entry cmd_unlink_window_entry;
 extern const struct cmd_entry cmd_up_pane_entry;
 
+/* cmd-attach-session.c */
+enum cmd_retval	 cmd_attach_session(struct cmd_q *, const char*, int, int);
+
 /* cmd-list.c */
 struct cmd_list	*cmd_list_parse(int, char **, const char *, u_int, char **);
 void		 cmd_list_free(struct cmd_list *);
@@ -1929,6 +1936,7 @@ void	 server_push_stdout(struct client *);
 void	 server_push_stderr(struct client *);
 int	 server_set_stdin_callback(struct client *, void (*)(struct client *,
 	     int, void *), void *, char **);
+void	 server_unzoom_window(struct window *);
 
 /* status.c */
 int	 status_out_cmp(struct status_out *, struct status_out *);
@@ -2132,6 +2140,8 @@ struct window_pane *window_find_string(struct window *, const char *);
 void		 window_set_active_pane(struct window *, struct window_pane *);
 struct window_pane *window_add_pane(struct window *, u_int);
 void		 window_resize(struct window *, u_int, u_int);
+int		 window_zoom(struct window_pane *);
+int		 window_unzoom(struct window *);
 void		 window_remove_pane(struct window *, struct window_pane *);
 struct window_pane *window_pane_at_index(struct window *, u_int);
 struct window_pane *window_pane_next_by_number(struct window *,
@@ -2188,7 +2198,7 @@ void		 layout_fix_panes(struct window *, u_int, u_int);
 u_int		 layout_resize_check(struct layout_cell *, enum layout_type);
 void		 layout_resize_adjust(
 		     struct layout_cell *, enum layout_type, int);
-void		 layout_init(struct window *);
+void		 layout_init(struct window *, struct window_pane *);
 void		 layout_free(struct window *);
 void		 layout_resize(struct window *, u_int, u_int);
 void		 layout_resize_pane(struct window_pane *, enum layout_type,