before updating, save the current klipper commit state in ini

kiauh.ini

@@ -1 +1,7 @@
-backup_before_update=false
+#don't edit this file if you don't know what you are doing...
+backup_before_update=false
+previous_origin_state=25a9a32e
+previous_smoothing_state=feb966c1
+previous_shaping_state=e0b94b7f
+previous_moonraker_state=9c29a4fc
+previous_dev_moonraker_state=528f9f25

scripts/update.sh

@@ -16,11 +16,12 @@ update_kiauh(){
 
 update_klipper(){
   stop_klipper
-  bb4u "klipper"
   if [ ! -d $KLIPPER_DIR ]; then
     cd ${HOME} && git clone $KLIPPER_REPO
   else
+    bb4u "klipper"
     read_branch
+    save_klipper_state
     status_msg "Updating $GET_BRANCH"
     #fetching origin/master -> error
     #rewriting origin/master to origin
@@ -64,4 +65,31 @@ update_mainsail(){
   status_msg "Updating Mainsail ..."
   install_mainsail
   start_klipper
+}
+
+save_klipper_state(){
+  source_ini
+  #read current klipper state
+  COMMIT_STATE=$(git rev-parse --short HEAD)
+  if [ $GET_BRANCH = origin/master ]; then
+    ORI_OLD=$previous_origin_state
+    ORI_NEW=$COMMIT_STATE
+    sed -i "/previous_origin_state=/s/$ORI_OLD/$ORI_NEW/" $INI_FILE
+  elif [ $GET_BRANCH = dmbutyugin/scurve-shaping ]; then
+    SHA_OLD=$previous_shaping_state
+    SHA_NEW=$COMMIT_STATE
+    sed -i "/previous_shaping_state=/s/$SHA_OLD/$SHA_NEW/" $INI_FILE
+  elif [ $GET_BRANCH = dmbutyugin/scurve-smoothing ]; then
+    SMO_OLD=$previous_smoothing_state
+    SMO_NEW=$COMMIT_STATE
+    sed -i "/previous_smoothing_state=/s/$SMO_OLD/$SMO_NEW/" $INI_FILE
+  elif [ $GET_BRANCH = Arksine/work-web_server-20200131 ]; then
+    WWS_OLD=$previous_moonraker_state
+    WWS_NEW=$COMMIT_STATE
+    sed -i "/previous_moonraker_state=/s/$WWS_OLD/$WWS_NEW/" $INI_FILE
+  elif [ $GET_BRANCH = Arksine/dev-moonraker-testing ]; then
+    DMT_OLD=$previous_dev_moonraker_state
+    DMT_NEW=$COMMIT_STATE
+    sed -i "/previous_dev_moonraker_state=/s/$DMT_OLD/$DMT_NEW/" $INI_FILE
+  fi
 }