add TMUX_FZF_WINDOW_FILTER

Author: aacebedo

README.md

@@ -154,6 +154,13 @@ Similarly, `TMUX_FZF_WINDOW_FORMAT` and `TMUX_FZF_SESSION_FORMAT` can also be ha
 
 For more information, check "FORMATS" section in tmux manual.
 
+
+## Filter
+
+When using the window listing script, it is possible to filter its output. This relies on the tmux filtering feature with a specific syntax for filters. For more information about this feature, check "FORMATS" section in the tmux manual.
+
+To use this filtering feature, set the variable `TMUX_FZF_WINDOW_FILTER` to the filter you want to apply before calling the `window.sh` script. 
+
 # FAQ
 
 **Q: Why use environment variables instead of tmux options to customize this plugin?**

scripts/window.sh

@@ -5,10 +5,17 @@ source "$CURRENT_DIR/.envs"
 
 current_window_origin=$(tmux display-message -p '#S:#I: #{window_name}')
 current_window=$(tmux display-message -p '#S:#I:')
+
+if [[ -z  "$TMUX_FZF_WINDOW_FILTER" ]]; then
+  window_filter="-a"
+else
+  window_filter="-f \"$TMUX_FZF_WINDOW_FILTER\""
+fi
+
 if [[ -z "$TMUX_FZF_WINDOW_FORMAT" ]]; then
-    windows=$(tmux list-windows -a)
+    windows=$(tmux list-windows $window_filter)
 else
-    windows=$(tmux list-windows -a -F "#S:#{window_index}: $TMUX_FZF_WINDOW_FORMAT")
+    windows=$(tmux list-windows $window_filter -F "#S:#{window_index}: $TMUX_FZF_WINDOW_FORMAT")
 fi
 
 FZF_DEFAULT_OPTS="$FZF_DEFAULT_OPTS --header='Select an action.'"