Rename session idx to session id throughout and add $ prefix to targets

to use it, extended from a diff from George Nachman.

1 files changed, 1 insertions, 0 deletions

diff --git a/format.c b/format.c
index 11f003c8..dc988278 100644
--- a/format.c
+++ b/format.c
@@ -280,6 +280,7 @@ format_session(struct format_tree *ft, struct session *s)
 	format_add(ft, "session_windows", "%u", winlink_count(&s->windows));
 	format_add(ft, "session_width", "%u", s->sx);
 	format_add(ft, "session_height", "%u", s->sy);
+	format_add(ft, "session_id", "%u", s->id);
 
 	sg = session_group_find(s);
 	format_add(ft, "session_grouped", "%d", sg != NULL);