lock: use xss-lock instead of xautolock

xss-lock features nice integration with standard X screensaver
feature which makes it easy to trigger it or to disable it. Moreover, it
also has some logind integration to lock screen before suspend.

bin/locker

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-exec i3lock -e -n -i $HOME/.cache/awesome/current-wallpaper.png

bin/notify-lock

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-icon="$1"
-
-exec notify-send "Lock screen" \
-    ${icon:+-i $icon} \
-    -t 10000 \
-    "Lock screen will be started in 10 seconds..."

bin/xautolock

@@ -1,11 +0,0 @@
-#!/bin/sh
-
-icon="$1"
-notify=$(dirname $(readlink -f "$0"))/notify-lock
-locker=$(dirname $(readlink -f "$0"))/locker
-
-exec xautolock \
-    -time 4 \
-    -locker "$locker" \
-    -notify 10 \
-    -notifier "$notify $icon"

bin/xss-lock

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+me="$(readlink -f "$0")"
+timeout=240
+notify=5
+
+case "$1" in
+    start)
+        xset s $timeout $notify
+        xset dpms $(($timeout * 2 + $notify)) $(($timeout * 3 + $notify)) $(($timeout * 4 + $notify))
+        exec xss-lock -n "$me dim" -l $me lock
+        ;;
+    dim)
+        trap 'exit 0' TERM INT
+        trap "xbacklight -steps 1 -set $(xbacklight -get); kill %%" EXIT
+        min_brightness=0
+        fade_time=$(($notify * 1000))
+        fade_steps=20
+        fade_step_time=0.05
+        xbacklight -time $fade_time -steps $fade_steps -set $min_brightness
+        sleep 2147483647 &
+        wait
+        ;;
+    lock)
+        i3lock_options="-e -i $HOME/.cache/awesome/current-wallpaper.png"
+        if [ -e /proc/self/fd/${XSS_SLEEP_LOCK_FD:--1} ]; then
+            trap 'kill %%' TERM INT
+            i3lock -n $i3lock_options {XSS_SLEEP_LOCK_FD}<&- &
+            exec {XSS_SLEEP_LOCK_FD}<&-
+            wait
+        else
+            trap 'kill %%' TERM INT
+            i3lock -n $i3lock_options &
+            wait
+        fi
+        ;;
+esac