Merge pull request #1 from va1entin/handle-redshift-transition-period

Handle redshift transition period

Author: va1entin

xfce4-night-mode-redshift.sh

@@ -4,11 +4,37 @@
 # https://gitlab.com/bimlas/xfce4-night-mode (main repository)
 # https://github.com/bimlas/xfce4-night-mode (mirror, please star if you like the plugin)
 
-if ( LC_ALL='C' redshift -p 2> /dev/null | grep 'Period: Night' > /dev/null ); then
-  mode='night'
-else
-  mode='day'
-fi
+# Change this variable to define which mode to use while RedShift transitions from day to night or vice versa
+# Choices: night|day
+TRANSITION_MODE='night'
+
+redshift_period=$( LC_ALL='C' redshift -p 2> /dev/null | grep -E '^Period: ' | grep -Eo '(Transition|Night|Day)' )
+
+case $redshift_period in
+  "Day")
+    mode='day'
+    ;;
+
+  "Night")
+    mode='night'
+    ;;
+
+  "Transition")
+    if [ $TRANSITION_MODE ]; then
+      if [[ $TRANSITION_MODE =~ (day|night) ]]; then
+        mode=$TRANSITION_MODE
+      else
+        echo 'Invalid value set for $TRANSITION_MODE!'
+      fi
+    else
+      echo 'RedShift transition period detected but $TRANSITION_MODE is not set. Set $TRANSITION_MODE to define which mode to use during transition periods.'
+    fi
+    ;;
+
+  *)
+    echo "Could not determine RedShift period: $redshift_period"
+    ;;
+esac
 
 "$(dirname "$0")/xfce4-night-mode.sh" "$mode" | sed '/<tool>/,/<\/tool>/ d'
 echo '<tool>