fix https://github.com/alibaba/p3c/issues/60

use Locale.default() for the initial language

eclipse-plugin/com.alibaba.smartfox.eclipse.plugin/src/main/kotlin/com/alibaba/smartfox/eclipse/SmartfoxActivator.kt

@@ -28,6 +28,7 @@ import org.eclipse.swt.graphics.Image
 import org.eclipse.swt.widgets.Display
 import org.eclipse.ui.plugin.AbstractUIPlugin
 import org.osgi.framework.BundleContext
+import java.util.Locale
 
 /**
  * @author caikang
@@ -72,20 +73,22 @@ class SmartfoxActivator : AbstractUIPlugin() {
         return image!!
     }
 
-    val locale: String get() {
-        val lang = preferenceStore.getString(localeKey)
-        return if (lang.isNullOrBlank()) {
-            "zh"
-        } else {
-            lang
+    val locale: String
+        get() {
+            val language = preferenceStore.getString(localeKey)
+            if (language.isNullOrBlank()) {
+                val lang = Locale.getDefault().language
+                return if (lang != Locale.ENGLISH.language && lang != Locale.CHINESE.language) {
+                    Locale.CHINESE.language
+                } else Locale.getDefault().language
+            }
+
+            return language
         }
-    }
 
     fun toggleLocale() {
-        preferenceStore.setValue(localeKey, when (locale) {
-            "en" -> "zh"
-            else -> "en"
-        })
+        val lang = if (Locale.ENGLISH.language == locale) Locale.CHINESE.language else Locale.ENGLISH.language
+        preferenceStore.setValue(localeKey, lang)
     }
 
     fun getRule(rule: String): Rule {

idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/action/SwitchLanguageAction.kt

@@ -32,15 +32,12 @@ import com.intellij.openapi.project.DumbAware
  * @date 2017/06/20
  */
 class SwitchLanguageAction : AnAction(), DumbAware {
-    val p3cConfig = P3cConfig::class.java.getService()
+    private val p3cConfig = P3cConfig::class.java.getService()
 
-    val textKey = "com.alibaba.p3c.action.switch_language.text"
+    private val textKey = "com.alibaba.p3c.action.switch_language.text"
 
     override fun actionPerformed(e: AnActionEvent) {
-        p3cConfig.locale = when (p3cConfig.locale) {
-            P3cConfig.localeZh -> P3cConfig.localeEn
-            else -> P3cConfig.localeZh
-        }
+        p3cConfig.toggleLanguage()
         BalloonNotifications.showSuccessNotification(P3cBundle.getMessage("$textKey.success"), e.project,
                 NotificationListener { notification, _ ->
                     notification.expire()

idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/config/P3cConfig.kt

@@ -20,6 +20,7 @@ import com.intellij.openapi.components.State
 import com.intellij.openapi.components.Storage
 import com.intellij.openapi.components.StoragePathMacros
 import com.intellij.util.xmlb.XmlSerializerUtil
+import java.util.Locale
 
 /**
  *
@@ -27,8 +28,7 @@ import com.intellij.util.xmlb.XmlSerializerUtil
  * @author caikang
  * @date 2017/06/19
  */
-@State(name = "P3cConfig",
-        storages = arrayOf(Storage(file = "${StoragePathMacros.APP_CONFIG}/smartfox/p3c.xml")))
+@State(name = "P3cConfig", storages = arrayOf(Storage(file = "${StoragePathMacros.APP_CONFIG}/smartfox/p3c.xml")))
 class P3cConfig : PersistentStateComponent<P3cConfig> {
     var astCacheTime = 1000L
     var astCacheEnable = true
@@ -38,7 +38,21 @@ class P3cConfig : PersistentStateComponent<P3cConfig> {
 
     var analysisBeforeCheckin = false
 
-    var locale = localeZh
+    var locale: String = ""
+        get() {
+            if (field.isEmpty()) {
+                val lang = Locale.getDefault().language
+                return if (lang != Locale.ENGLISH.language && lang != Locale.CHINESE.language) {
+                    Locale.CHINESE.language
+                } else Locale.getDefault().language
+            }
+
+            return field
+        }
+
+    fun toggleLanguage() {
+        locale = if (localeEn == locale) localeZh else localeEn
+    }
 
     override fun getState(): P3cConfig {
         return this
@@ -51,8 +65,9 @@ class P3cConfig : PersistentStateComponent<P3cConfig> {
         XmlSerializerUtil.copyBean(state, this)
     }
 
+
     companion object {
-        val localeEn = "en"
-        val localeZh = "zh"
+        val localeEn = Locale.ENGLISH.language!!
+        val localeZh = Locale.CHINESE.language!!
     }
 }

idea-plugin/p3c-common/src/main/kotlin/com/alibaba/p3c/idea/i18n/P3cBundle.kt

@@ -29,7 +29,7 @@ import java.util.ResourceBundle
  * @date 2017/06/20
  */
 object P3cBundle {
-    val p3cConfig = P3cConfig::class.java.getService()
+    private val p3cConfig = P3cConfig::class.java.getService()
     private val resourceBundle = ResourceBundle.getBundle("messages.P3cBundle",
             Locale(p3cConfig.locale), I18nResources.XmlControl())