Allow rules string as a configuration alternative (#19)

fixtures/rules/config.json

@@ -0,0 +1,10 @@
+{
+  "enabled": true,
+  "channel": "beta",
+  "config": {
+    "rules": ["java-basic", "java-design"]
+  },
+  "include_paths": [
+    "Main.java"
+  ]
+}

fixtures/rules/config.mix.json

@@ -0,0 +1,11 @@
+{
+  "enabled": true,
+  "channel": "beta",
+  "config": {
+    "file": "rules.xml",
+    "rules": ["java-basic", "java-design"]
+  },
+  "include_paths": [
+    "Main.java"
+  ]
+}

src/Config.groovy

@@ -22,16 +22,15 @@ class Config {
   }
 
   def ruleSet() {
-    if(parsedConfig.config) {
-      def configFile = parsedConfig.config instanceof String ? parsedConfig.config : parsedConfig.config.file
-
-      def specifiedRules = new File(appContext.codeFolder, configFile)
-      if(specifiedRules.exists()) {
-        return specifiedRules.absolutePath
-      } else {
-        System.err.println "Config file ${configFile} not found"
-        System.exit(1)
-      }
+    def config = parsedConfig.config
+
+    switch(config) {
+      case String:
+        return specifiedRules(config)
+        break
+      case Map:
+        return rulesOrFile(config)
+        break
     }
 
     def defaultFile = new File(appContext.codeFolder, "ruleset.xml")
@@ -46,6 +45,30 @@ class Config {
     filesList.absolutePath
   }
 
+  private def rulesOrFile(config) {
+    validate(config)
+    if(config.rules) {
+      return config.rules.join(",")
+    }
+    return specifiedRules(config.file)
+  }
+
+  private def validate(config) {
+    if(config.file && config.rules) {
+      throw new IllegalArgumentException("Config should contain 'file' OR 'rules'")
+    }
+  }
+
+  private def specifiedRules(configFile) {
+    def rules = new File(appContext.codeFolder, configFile)
+    if(rules.exists()) {
+      return rules.absolutePath
+    } else {
+      System.err.println "Config file ${configFile} not found"
+      System.exit(1)
+    }
+  }
+
   private def filesToAnalyze() {
     def includePaths = parsedConfig.include_paths?.join(" ")
     def codeFolder = new File(appContext.codeFolder)

test/ConfigTest.groovy

@@ -5,18 +5,30 @@ class ConfigTest {
   @Test
   public void defaultRuleSet() {
     def config = new Config([configFile: "/usr/src/app/fixtures/default/config.json", codeFolder: "/usr/src/app/fixtures/default"])
-    assertEquals config.ruleSet(), "/usr/src/app/ruleset.xml"
+    assertEquals "/usr/src/app/ruleset.xml", config.ruleSet()
   }
 
   @Test
   public void specifiedRuleSetFile() {
     def config = new Config([configFile: "/usr/src/app/fixtures/specified_file/config.new.json", codeFolder: "/usr/src/app/fixtures/specified_file"])
-    assertEquals config.ruleSet(), "/usr/src/app/fixtures/specified_file/rules.xml"
+    assertEquals "/usr/src/app/fixtures/specified_file/rules.xml", config.ruleSet()
   }
 
   @Test
   public void honorPresentRules() {
     def config = new Config([configFile: "/usr/src/app/fixtures/ruleset_default_file/config.json", codeFolder: "/usr/src/app/fixtures/ruleset_default_file"])
-    assertEquals config.ruleSet(), "/usr/src/app/fixtures/ruleset_default_file/ruleset.xml"
+    assertEquals "/usr/src/app/fixtures/ruleset_default_file/ruleset.xml", config.ruleSet()
+  }
+
+  @Test(expected = IllegalArgumentException.class)
+  public void doesNotAllowToMixRulesAndFile() {
+    def config = new Config([configFile: "/usr/src/app/fixtures/rules/config.mix.json", codeFolder: "/usr/src/app/fixtures/rules"])
+    config.ruleSet()
+  }
+
+  @Test
+  public void acceptRulesSimpleNames() {
+    def config = new Config([configFile: "/usr/src/app/fixtures/rules/config.json", codeFolder: "/usr/src/app/fixtures/rules"])
+    assertEquals "java-basic,java-design", config.ruleSet()
   }
 }