Window Color Inverter

Assign to a hotkey: toggle (focused) window color inversion.

Good accessibility enhancement.

Obviously, stripped right out of the examples.

dbus-examples/inverter.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+#TODO: Check compton running; Check dbus interface available
+
+if [ -z "$SED" ]; then
+  SED="sed"
+  command -v gsed > /dev/null && SED="gsed"
+fi
+
+# === Get connection parameters ===
+
+dpy=$(echo -n "$DISPLAY" | tr -c '[:alnum:]' _)
+
+if [ -z "$dpy" ]; then
+  echo "Cannot find display."
+  exit 1;
+fi
+
+service="com.github.chjj.compton.${dpy}"
+interface="com.github.chjj.compton"
+object='/com/github/chjj/compton'
+type_win='uint32'
+type_enum='uint16'
+
+# === Color Inversion ===
+
+# Ensure we are tracking focus
+dbus-send --print-reply --dest="$service" "$object" "${interface}.opts_set" string:track_focus boolean:true &
+
+# Get window ID of currently focused window
+focused=$(dbus-send --print-reply --dest="$service" "$object" "${interface}.find_win" string:focused | $SED -n 's/^[[:space:]]*'${type_win}'[[:space:]]*\([[:digit:]]*\).*/\1/p')
+
+if [ -n "$focused" ]; then
+  # Get invert_color_force property of the focused window
+  color=$(dbus-send --print-reply --dest="$service" "$object" "${interface}.win_get" "${type_win}:${focused}" string:invert_color_force | $SED -n 's/^[[:space:]]*'${type_enum}'[[:space:]]*\([[:digit:]]*\).*/\1/p')
+  # Set the window to have inverted color
+  case "${color}" in
+    0)
+      # Set the window to have inverted color
+      dbus-send --print-reply --dest="$service" "$object" "${interface}.win_set" "${type_win}:${focused}" string:invert_color_force "${type_enum}:1" &
+    ;;
+    *) # Some windows have invert_color_force == 2
+      # Set the window to have normal color
+      dbus-send --print-reply --dest="$service" "$object" "${interface}.win_set" "${type_win}:${focused}" string:invert_color_force "${type_enum}:0" &
+    ;;
+  esac
+else
+  echo "Cannot find focused window."
+  exit 1;
+fi
+exit 0;