feat(robot): add config.onSave function

libs/robot.lua

@@ -10,11 +10,16 @@ local DEFAULT_CONFIG = {
   stateFilePath = ROBOT_DEFAULT_STATE_FILE
 }
 
+local function identity(x)
+  return x
+end
+
 local function getConfig(givenConfig)
   return {
     autosave = givenConfig.autosave or DEFAULT_CONFIG.autosave,
     autoload = givenConfig.autoload or DEFAULT_CONFIG.autoload,
-    stateFilePath = givenConfig.stateFilePath or DEFAULT_CONFIG.stateFilePath
+    stateFilePath = givenConfig.stateFilePath or DEFAULT_CONFIG.stateFilePath,
+    onSave = givenConfig.onSave or identity
   }
 end
 
@@ -28,8 +33,7 @@ local function createDefaultState()
   }
 end
 
-local saveRobotState = function(stateFile, state)
+local saveRobotState = function(stateFile, onSave, state)
-  stateFile = stateFile or ROBOT_DEFAULT_STATE_FILE
   state = state or createDefaultState()
   local file = fs.open(stateFile, 'w')
 
@@ -37,18 +41,17 @@ local saveRobotState = function(stateFile, state)
     error('saveRobotState: cannot open ' .. stateFile ..  ' file!')
   end
 
-  file.write(textutils.serializeJSON(state))
+  file.write(textutils.serializeJSON(onSave(state)))
   file.close()
 
   return state
 end
 
-local loadRobotState = function(stateFile)
+local loadRobotState = function(stateFile, onSave)
-  stateFile = stateFile or ROBOT_DEFAULT_STATE_FILE
   local file = fs.open(stateFile, 'r')
 
   if not file then
-    return robot.saveRobotState(stateFile)
+    return robot.saveRobotState(stateFile, onSave)
   end
 
   local serializedRobotState = file.readAll()
@@ -57,7 +60,7 @@ local loadRobotState = function(stateFile)
   local parsedResult = textutils.unserializeJSON(serializedRobotState)
 
   if not parsedResult then
-    return robot.saveRobotState(stateFile)
+    return robot.saveRobotState(stateFile, onSave)
   end
 
   return parsedResult
@@ -68,7 +71,7 @@ local getAutoSave = function(config, state)
 
   if config.autosave then
     autoSave = function()
-      saveRobotState(config.stateFilePath, state)
+      saveRobotState(config.stateFilePath, config.onSave, state)
     end
   end
 
@@ -192,11 +195,11 @@ api.create = function(state, givenConfig)
   end
 
   robot.saveState = function()
-    return saveRobotState(config.stateFilePath, state)
+    return saveRobotState(config.stateFilePath, config.onSave, state)
   end
 
   robot.loadState = function(stateFile)
-    return loadRobotState(config.stateFilePath)
+    return loadRobotState(config.stateFilePath, config.onSave)
   end
 
   return robot