Add configuration for GNOME

.local/bin/night-light-toggle-enabled

@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# Triggered by <Alt><Shift>n
+# as defined in [org/gnome/settings-daemon/plugins/media-keys]
+# in ~/.config/gnome-settings/key-bindings.ini
+#
+# See ~/.local/bin/night-light-toggle-schedule
+# for the other half of the toggling logic
+# and extensive documentation
+
+
+set -eu
+
+
+notify() {
+    ID_FILE="${XDG_RUNTIME_DIR}/night-light-notification-id"
+    _id=$(cat "$ID_FILE" 2>/dev/null || true)
+
+    if [ -n "$_id" ]; then
+        notify-send -p -t 5000 --replace-id="$_id" "Night Light" "$1" > "$ID_FILE" || rm -f "$ID_FILE"
+    else
+        notify-send -p -t 5000 "Night Light" "$1" > "$ID_FILE" || rm -f "$ID_FILE"
+    fi
+}
+
+
+Schema=org.gnome.settings-daemon.plugins.color
+
+
+if [ "$(gsettings get $Schema night-light-enabled)" = "true" ]; then
+
+    active_before=$(gdbus call --session \
+        --dest org.gnome.SettingsDaemon.Color \
+        --object-path /org/gnome/SettingsDaemon/Color \
+        --method org.freedesktop.DBus.Properties.Get \
+        org.gnome.SettingsDaemon.Color NightLightActive)
+
+    gsettings set $Schema night-light-enabled false
+
+    if [ "$active_before" = "(<false>,)" ]; then
+        notify "is now disabled, but the screen was not tinted anyways"
+    fi
+
+else
+
+    gsettings set $Schema night-light-enabled true
+
+    # We could start from our default warmth, as defined
+    # in [org/gnome/settings-daemon/plugins/color]
+    # in ~/.config/gnome-settings/misc.ini
+    # but choose not to do that because the default
+    # warmth is reset anyways after a reboot
+    # gsettings set $Schema night-light-temperature "uint32 2200"
+
+    # Give the settings daemon a moment to recompute "NightLightActive"
+    sleep 0.1
+
+    active_after=$(gdbus call --session \
+        --dest org.gnome.SettingsDaemon.Color \
+        --object-path /org/gnome/SettingsDaemon/Color \
+        --method org.freedesktop.DBus.Properties.Get \
+        org.gnome.SettingsDaemon.Color NightLightActive)
+
+    if [ "$active_after" = "(<false>,)" ]; then
+        notify "is now enabled, but the schedule keeps it off for now"
+    fi
+
+fi