#12: export loglevel setters to JS

README.md

@@ -33,7 +33,7 @@ wvlet-log is a libray for enhancing your Scala application logging with colors a
 ```scala
 libraryDependencies += "org.wvlet" %% "wvlet-log" % "(version)"
 
-// For Scala.js (Since 1.2)
+// For Scala.js (Since wvlet-log 1.2)
 libraryDependencies += "org.wvlet" %%% "wvlet-log" % "(version)"
 ```
 
@@ -171,6 +171,29 @@ Logger.setDefaultFormatter(CustomLogFormatter)
 ```
 See also the examples in [LogFormat.scala](src/main/scala/wvlet/log/LogFormat.scala):
 
+### Using wvlet-log in Scala.js
+
+
+```scala
+import wvlet.log._
+
+Logger.setDefaultHandler(JSConsoleLogHandler())
+
+class YourAppClass extends LogSupport {
+
+  info("hello")
+}
+```
+
+The log message will be showin in your browser's developer console.
+
+To configure the log level, use `wvlet.log.setDefaultLogLevel` or `wvlet.log.setLogLevel`: 
+```javascript
+> wvlet.log.setDefaultLogLevel("debug")
+
+> wvlet.log.setLogLevel("your.logger.name", "trace")
+```
+
 ### Using with slf4j
 
 If you are using slf4j, just add `slf4j-jdk14` to your dependency. The log messages from slf4j will be sent to wvlet-log:

wvlet-log/js/src/main/scala/wvlet/log/JSConsoleLogHandler.scala

@@ -40,8 +40,12 @@ class JSConsoleLogHandler(logColorPalette: JSLogColorPalette = JSConsoleLogHandl
 }
 
 object JSConsoleLogHandler {
+
   val DEFAULT_COLOR_PALETTE : JSLogColorPalette = new JSLogColorPalette()
 
+  def apply() : JSConsoleLogHandler = new JSConsoleLogHandler(DEFAULT_COLOR_PALETTE)
+  def apply(colorPalette:JSLogColorPalette) = new JSConsoleLogHandler(colorPalette)
+
   case class JSLogColorPalette(
     error:String = "#D32F2F",
     warn:String = "#E64A19",

wvlet-log/js/src/main/scala/wvlet/log/JSLogger.scala

@@ -0,0 +1,21 @@
+package wvlet.log
+
+import scala.scalajs.js.annotation.{JSExport, JSExportTopLevel}
+
+/**
+  *
+  */
+@JSExportTopLevel("wvlet.log")
+object JSLogger {
+  @JSExport
+  def setDefaultLogLevel(level:String) : Boolean = {
+    Logger.setDefaultLogLevel(LogLevel(level))
+    true
+  }
+
+  @JSExport
+  def setLogLevel(loggerName:String, level:String) : Boolean = {
+    Logger(loggerName).setLogLevel(LogLevel(level))
+    true
+  }
+}

wvlet-log/js/src/main/scala/wvlet/log/LogEnv.scala

@@ -5,6 +5,7 @@ import java.io.PrintStream
 /**
   *
   */
+
 private[log] object LogEnv extends LogEnvBase {
   override def isScalaJS: Boolean = true
   override def defaultLogLevel: LogLevel = LogLevel.INFO
@@ -16,7 +17,7 @@ private[log] object LogEnv extends LogEnvBase {
 
     // In Scala.js we cannot use cl.getInterfaces to find the actual type
     val pos = name.indexOf("$")
-    if(pos > 0) {
+    if (pos > 0) {
       // Remove trailing $xxx
       name = name.substring(0, pos)
     }

wvlet-log/js/src/test/scala/wvlet/log/JSConsoleLogHandlerTest.scala

@@ -7,7 +7,7 @@ class JSConsoleLogHandlerTest extends Spec {
 
   "JSConsoleLogHandler" should {
 
-    Logger.setDefaultHandler(new JSConsoleLogHandler)
+    Logger.setDefaultHandler(JSConsoleLogHandler())
 
     error("error message")
     warn("warn message")