Use screen-temperature script

.bin/screen-temperature

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+import sys
+import subprocess
+
+DEFAULT_TEMPERATURE = 3500
+
+try:
+    with open('/tmp/temperature', 'r') as temp_file:
+        current_temperature = int(temp_file.read())
+except FileNotFoundError:
+    current_temperature = DEFAULT_TEMPERATURE
+
+# If no argument is given print the current temperature
+if len(sys.argv) == 1:
+    print(current_temperature)
+    sys.exit(0)
+elif len(sys.argv) != 2:
+    print("""
+Usage:
+
+  screen-temperature
+      print current temperature
+
+  screen-temperature <temperature>
+      set screen temperature to <temperature>
+
+  screen-temperature <+|-><temperature>
+      increase or decrease screen temperature by <temperature>
+""")
+    sys.exit(1)
+
+temperature_change = sys.argv[1]
+
+if temperature_change.startswith("+"):
+    new_temperature = current_temperature + int(temperature_change[1:])
+elif temperature_change.startswith("-"):
+    new_temperature = current_temperature - int(temperature_change[1:])
+else:
+    new_temperature = int(temperature_change)
+
+try:
+    subprocess.run(["redshift", "-O", str(new_temperature), "-P"], check=True)
+    with open('/tmp/temperature', 'w') as temp_file:
+        temp_file.write(str(new_temperature) + '\n')
+except subprocess.CalledProcessError:
+    print("Error: could not set screen temperature.")
+    sys.exit(1)

.xmonad/xmonad.hs

@@ -252,9 +252,9 @@ pause = spawn "playerctl pause"
 brighten, dim, warm, cool, resetTemp :: X ()
 brighten = spawn "brightnessctl set 20+"
 dim = spawn "brightnessctl set 20-"
-warm = spawn "echo $(($(cat /tmp/temperature) + 50)) > /tmp/temperature && redshift -O $(cat /tmp/temperature) -P && notify < /tmp/temperature -h string:x-canonical-private-synchronous:anything"
-cool = spawn "echo $(($(cat /tmp/temperature) - 50)) > /tmp/temperature && redshift -O $(cat /tmp/temperature) -P && notify < /tmp/temperature -h string:x-canonical-private-synchronous:anything"
-resetTemp = spawn "echo 3000 > /tmp/temperature && redshift -x"
+warm = spawn "screen-temperature +50 && notify < /tmp/temperature -h string:x-canonical-private-synchronous:anything"
+cool = spawn "screen-temperature -50 && notify < /tmp/temperature -h string:x-canonical-private-synchronous:anything"
+resetTemp = spawn "screen-temperature 3000"
 
 -- }}}