Introduce Plugin.isEnabled

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/plugin/JvmPluginInternal.kt

@@ -37,6 +37,9 @@ internal abstract class JvmPluginInternal(
 ) : JvmPlugin,
     CoroutineScope {
 
+    override val isEnabled: Boolean
+        get() = job.isActive
+
     private val resourceContainerDelegate by lazy { this::class.java.classLoader.asResourceContainer() }
     override fun getResourceAsStream(name: String): InputStream? = resourceContainerDelegate.getResourceAsStream(name)
 

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/plugin/Plugin.kt

@@ -25,6 +25,14 @@ import java.io.File
  * @see PluginLoader 插件加载器
  */
 public interface Plugin {
+    /**
+     * 判断此插件是否已启用
+     *
+     * @see disable 关闭这个插件
+     * @see enable 启用这个插件
+     */
+    public val isEnabled: Boolean
+
     /**
      * 所属插件加载器实例, 此加载器必须能加载这个 [Plugin].
      */