Issue #50: Accept propertypath as input param

src/main/java/org/checkstyle/autofix/CheckstyleAutoFix.java

@@ -42,6 +42,12 @@ public class CheckstyleAutoFix extends Recipe {
             example = "config/checkstyle.xml")
     private String configurationPath;
 
+    @Option(displayName = "Checkstyle properties file path",
+            description = "Path to the file containing the Checkstyle Properties.",
+            example = "config/checkstyle.properties",
+            required = false)
+    private String propertiesPath;
+
     @Override
     public String getDisplayName() {
         return "Checkstyle autoFix";
@@ -60,6 +66,10 @@ public String getConfigurationPath() {
         return configurationPath;
     }
 
+    public String getPropertiesPath() {
+        return propertiesPath;
+    }
+
     @Override
     public List<Recipe> getRecipeList() {
         final List<CheckstyleViolation> violations = CheckstyleReportParser
@@ -69,6 +79,6 @@ public List<Recipe> getRecipeList() {
     }
 
     private CheckConfiguration loadCheckstyleConfiguration() {
-        return ConfigurationLoader.loadConfiguration(getConfigurationPath());
+        return ConfigurationLoader.loadConfiguration(getConfigurationPath(), getPropertiesPath());
     }
 }

src/main/java/org/checkstyle/autofix/parser/ConfigurationLoader.java

@@ -17,6 +17,8 @@
 
 package org.checkstyle.autofix.parser;
 
+import java.io.FileInputStream;
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -57,13 +59,26 @@ private static CheckConfiguration mapConfiguration(Configuration config) {
         return new CheckConfiguration(config.getName(), properties, List.of(simpleChildren));
     }
 
-    public static CheckConfiguration loadConfiguration(String checkstyleConfigurationPath) {
+    public static CheckConfiguration loadConfiguration(String checkstyleConfigurationPath,
+                                                       String propFile) {
+        Properties props = new Properties();
+        if (propFile == null) {
+            props = System.getProperties();
+        }
+        else {
+            try (FileInputStream input = new FileInputStream(propFile)) {
+                props.load(input);
+            }
+            catch (IOException exception) {
+                throw new IllegalStateException("Failed to read: " + propFile, exception);
+            }
+        }
 
         final Configuration checkstyleConfig;
         try {
             checkstyleConfig = com.puppycrawl.tools.checkstyle.ConfigurationLoader
                     .loadConfiguration(checkstyleConfigurationPath,
-                            new PropertiesExpander(new Properties()));
+                            new PropertiesExpander(props));
         }
         catch (CheckstyleException exception) {
             throw new IllegalStateException("Failed to load configuration:"

src/main/resources/META-INF/rewrite/recipes.yml

@@ -16,3 +16,4 @@ recipeList:
   - org.checkstyle.autofix.CheckstyleAutoFix:
       violationReportPath: "target/checkstyle/checkstyle-report.xml"
       configurationPath: "https://raw.githubusercontent.com/checkstyle/checkstyle/checkstyle-${checkstyle.version}/config/checkstyle-checks.xml"
+      propertiesPath: "config/checkstyle.properties"