Add lemonbar implementation for bspwm

home/.config/lemonbar/applet-window

@@ -0,0 +1,41 @@
+#!/usr/bin/env zsh
+
+PANEL_FIFO="$1"
+PREFIX="$2"
+DELAY="$3"
+MAX_LEN="$(("$4"-3))"
+
+exec 5>"$PANEL_FIFO"
+
+main() {
+    local win_id="$(bspc query -N -n focused)"
+    local win_name="$(xprop -id "$win_id" | grep "^WM_NAME" | cut -d' ' -f3- | tr -d '"')"
+    local trimmed_win_name="${win_name:0:$MAX_LEN}"
+    if [[ "$win_name" != "$trimmed_win_name" ]]; then
+        win_name="${trimmed_win_name}..."
+    fi
+
+    REPLY="$trimmed_win_name"
+}
+
+# Run 2 loops here, one for instant updates once other window is focused
+# in bspwm, other for timed updates, in case the window changes it's title
+# on it's own (such as when we switch a tab in firefox)
+
+{print init; stdbuf -oL bspc subscribe node} | while read line; do
+    case ${line} in
+        node_focus* ) main ;;
+        init ) main ;;
+        * ) continue ;;
+    esac
+
+    echo "$PREFIX $REPLY" >&5
+done &
+
+while :; do
+    main
+    echo "$PREFIX $REPLY" >&5
+    sleep "$DELAY"
+done
+
+wait $!