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scripts/.local/bin/picom_toggle_inactive_opacity

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+#!/bin/bash
+# toggle the translucency of inactive windows in the picom compositor
+# by substituting the true/false setting in the picom config file.
+# picom will automatically reload its settings on any config file changes.
+#
+# scipt can be called without arguments to toggle the value;
+# or with on / off to set it to translucent / opaque, respectively.
+
+piconf="$XDG_CONFIG_HOME"/picom/picom.conf
+
+line=$(grep -n "inactive-opacity-override" "$piconf")
+
+IFS=: read -r line text < <(grep -n "inactive-opacity-override" "$piconf")
+
+_replace() { # line file old new
+  sed -i "$1 s/$3/$4/" "$2"
+}
+
+if [ "$1" = "off" ]; then
+  _replace "$line" "$piconf" "true" "false"
+elif [ "$1" = "on" ]; then
+  _replace "$line" "$piconf" "false" "true"
+elif echo "$text" | grep -q "true"; then
+  _replace "$line" "$piconf" "true" "false"
+elif echo "$text" | grep -q "false"; then
+  _replace "$line" "$piconf" "false" "true"
+fi