Support negative trim values (#{=-10:pane_title}) to trim from the end,

suggested by Kevin Brubeck Unhammer.

1 files changed, 7 insertions, 3 deletions

diff --git a/tmux.1 b/tmux.1
index e70b07c3..5dbf6b84 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3377,9 +3377,13 @@ if not.
 A limit may be placed on the length of the resultant string by prefixing it
 by an
 .Ql = ,
-a number and a colon, so
-.Ql #{=10:pane_title}
-will include at most the first 10 characters of the pane title.
+a number and a colon.
+Positive numbers count from the start of the string and negative from the end,
+so
+.Ql #{=5:pane_title}
+will include at most the first 5 characters of the pane title, or
+.Ql #{=-5:pane_title}
+the last 5 characters.
 Prefixing a time variable with
 .Ql t:
 will convert it to a string, so if