/src/main/groovy/ui/Console.groovy

/*
 * Copyright 2003-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.ui

import groovy.inspect.swingui.ObjectBrowser
import groovy.inspect.swingui.AstBrowser
import groovy.swing.SwingBuilder
import groovy.ui.text.FindReplaceUtility

import java.awt.Component
import java.awt.EventQueue
import java.awt.Font
import java.awt.Toolkit
import java.awt.Window
import java.awt.event.ActionEvent
import java.awt.event.ComponentEvent
import java.awt.event.ComponentListener
import java.awt.event.FocusListener
import java.awt.event.FocusEvent
import java.util.prefs.Preferences
import javax.swing.*
import javax.swing.event.CaretEvent
import javax.swing.event.CaretListener
import javax.swing.event.HyperlinkListener
import javax.swing.event.HyperlinkEvent
import javax.swing.text.AttributeSet
import javax.swing.text.Element
import javax.swing.text.SimpleAttributeSet
import javax.swing.text.Style
import javax.swing.text.StyleConstants
import javax.swing.text.html.HTML
import javax.swing.filechooser.FileFilter

import org.codehaus.groovy.runtime.StackTraceUtils
import org.codehaus.groovy.control.ErrorCollector
import org.codehaus.groovy.control.MultipleCompilationErrorsException
import org.codehaus.groovy.control.messages.SyntaxErrorMessage
import org.codehaus.groovy.syntax.SyntaxException
import org.codehaus.groovy.control.messages.ExceptionMessage
import java.awt.Dimension
import java.awt.BorderLayout
import org.codehaus.groovy.control.CompilerConfiguration
import org.codehaus.groovy.control.customizers.ASTTransformationCustomizer
import groovy.transform.ThreadInterrupt

/**
 * Groovy Swing console.
 *
 * Allows user to interactively enter and execute Groovy.
 *
 * @version $Id$
 * @author Danno Ferrin
 * @author Dierk Koenig, changed Layout, included Selection sensitivity, included ObjectBrowser
 * @author Alan Green more features: history, System.out capture, bind result to _
 * @author Guillaume Laforge, stacktrace hyperlinking to the current script line
 * @author Hamlet D'Arcy, AST browser
 * @author Roshan Dawrani
 * @author Paul King
 */
class Console implements CaretListener, HyperlinkListener, ComponentListener, FocusListener {

    static final String DEFAULT_SCRIPT_NAME_START = "ConsoleScript"

    static private prefs = Preferences.userNodeForPackage(Console)

    // Whether or not std output should be captured to the console
    static boolean captureStdOut = prefs.getBoolean('captureStdOut', true)
    static boolean captureStdErr = prefs.getBoolean('captureStdErr', true)
    static consoleControllers = []

    boolean fullStackTraces = prefs.getBoolean('fullStackTraces',
        Boolean.valueOf(System.getProperty("groovy.full.stacktrace", "false")))
    Action fullStackTracesAction

    boolean showScriptInOutput = prefs.getBoolean('showScriptInOutput', true)
    Action showScriptInOutputAction

    boolean visualizeScriptResults = prefs.getBoolean('visualizeScriptResults', false)
    Action visualizeScriptResultsAction

    boolean showToolbar = prefs.getBoolean('showToolbar', true)
    Component toolbar
    Action showToolbarAction

    boolean detachedOutput = prefs.getBoolean('detachedOutput', false)
    Action detachedOutputAction
    Action showOutputWindowAction
    Action hideOutputWindowAction1
    Action hideOutputWindowAction2
    Action hideOutputWindowAction3
    Action hideOutputWindowAction4
    int origDividerSize
    Component outputWindow
    Component copyFromComponent
    Component blank
    Component scrollArea

    boolean autoClearOutput = prefs.getBoolean('autoClearOutput', false)
    Action autoClearOutputAction

    // Safer thread interruption
    boolean threadInterrupt = prefs.getBoolean('threadInterrupt', false)
    Action threadInterruptAction

    // Maximum size of history
    int maxHistory = 10

    // Maximum number of characters to show on console at any time
    int maxOutputChars = System.getProperty('groovy.console.output.limit','20000') as int

    // UI
    SwingBuilder swing
    RootPaneContainer frame
    ConsoleTextEditor inputEditor
    JSplitPane splitPane
    JTextPane inputArea
    JTextPane outputArea
    JLabel statusLabel
    JLabel rowNumAndColNum

    // row info
    Element rootElement
    int cursorPos
    int rowNum
    int colNum

    // Styles for output area
    Style promptStyle
    Style commandStyle
    Style outputStyle
    Style stacktraceStyle
    Style hyperlinkStyle
    Style resultStyle

    // Internal history
    List history = []
    int historyIndex = 1 // valid values are 0..history.length()
    HistoryRecord pendingRecord = new HistoryRecord( allText: "", selectionStart: 0, selectionEnd: 0)
    Action prevHistoryAction
    Action nextHistoryAction

    // Current editor state
    boolean dirty
    Action saveAction
    int textSelectionStart  // keep track of selections in inputArea
    int textSelectionEnd
    def scriptFile
    File currentFileChooserDir = new File(Preferences.userNodeForPackage(Console).get('currentFileChooserDir', '.'))
    File currentClasspathJarDir = new File(Preferences.userNodeForPackage(Console).get('currentClasspathJarDir', '.'))
    File currentClasspathDir = new File(Preferences.userNodeForPackage(Console).get('currentClasspathDir', '.'))

    // Running scripts
    CompilerConfiguration config
    GroovyShell shell
    int scriptNameCounter = 0
    SystemOutputInterceptor systemOutInterceptor
    SystemOutputInterceptor systemErrorInterceptor
    Thread runThread = null
    Closure beforeExecution
    Closure afterExecution

    public static String ICON_PATH = '/groovy/ui/ConsoleIcon.png' // used by ObjectBrowser and AST Viewer 
    public static String NODE_ICON_PATH = '/groovy/ui/icons/bullet_green.png' // used by AST Viewer

    private static groovyFileFilter = new GroovyFileFilter()
    private boolean scriptRunning = false
    private boolean stackOverFlowError = false
    Action interruptAction
    
    static void main(args) {
        if (args.length == 1 && args[0] == '--help') {
            println '''usage: groovyConsole [options] [filename]
options:
  --help                               This Help message
  -cp,-classpath,--classpath <path>    Specify classpath'''
            return
        }

        // allow the full stack traces to bubble up to the root logger
        java.util.logging.Logger.getLogger(StackTraceUtils.STACK_LOG_NAME).useParentHandlers = true

        //when starting via main set the look and feel to system
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 

        def console = new Console(Console.class.classLoader?.getRootLoader())
        console.run()
        if (args.length == 1) console.loadScriptFile(args[0] as File)
    }

    Console() {
        this(new Binding())
    }

    Console(Binding binding) {
        this(null, binding)
    }

    Console(ClassLoader parent) {
        this(parent, new Binding())
    }

    Console(ClassLoader parent, Binding binding) {
        newScript(parent, binding);
        try {
            System.setProperty("groovy.full.stacktrace", System.getProperty("groovy.full.stacktrace",
                    Boolean.toString(prefs.getBoolean('fullStackTraces', false))))
        } catch (SecurityException se) {
            fullStackTracesAction.enabled = false;
        }
        consoleControllers += this

        // listen for Ivy events if Ivy is on the Classpath
        try {
            if (Class.forName('org.apache.ivy.core.event.IvyListener')) {
                def ivyPluginClass = Class.forName('groovy.ui.ConsoleIvyPlugin')
                ivyPluginClass.newInstance().addListener(this)
            }
        } catch(ClassNotFoundException ignore) { }

        binding.variables._outputTransforms = OutputTransforms.loadOutputTransforms()
    }

    void newScript(ClassLoader parent, Binding binding) {
        config = new CompilerConfiguration()
        if (threadInterrupt) config.addCompilationCustomizers(new ASTTransformationCustomizer(ThreadInterrupt))

        shell = new GroovyShell(parent, binding, config)
    }

    static def frameConsoleDelegates = [
            rootContainerDelegate:{
                frame(
                    title: 'GroovyConsole',
                    //location: [100,100], // in groovy 2.0 use platform default location
                    iconImage: imageIcon("/groovy/ui/ConsoleIcon.png").image,
                    defaultCloseOperation: JFrame.DO_NOTHING_ON_CLOSE,
                ) {
                    try {
                        current.locationByPlatform = true
                    } catch (Exception e) {
                        current.location = [100, 100] // for 1.4 compatibility
                    }
                    containingWindows += current
                }
            },
            menuBarDelegate: {arg->
                current.JMenuBar = build(arg)}
        ];

    void run() {
        run(frameConsoleDelegates)
    }

    void run(JApplet applet) {
        run([
            rootContainerDelegate:{
                containingWindows += SwingUtilities.getRoot(applet.getParent())
                applet
            },
            menuBarDelegate: {arg->
                current.JMenuBar = build(arg)}
        ])
    }

    void run(Map defaults) {

        swing = new SwingBuilder()
        defaults.each{k, v -> swing[k] = v}

        // tweak what the stack traces filter out to be fairly broad
        System.setProperty("groovy.sanitized.stacktraces", """org.codehaus.groovy.runtime.
                org.codehaus.groovy.
                groovy.lang.
                gjdk.groovy.lang.
                sun.
                java.lang.reflect.
                java.lang.Thread
                groovy.ui.Console""")


        // add controller to the swingBuilder bindings
        swing.controller = this

        // create the actions
        swing.build(ConsoleActions)

        // create the view
        swing.build(ConsoleView)

        bindResults()

        // stitch some actions together
        swing.bind(source:swing.inputEditor.undoAction, sourceProperty:'enabled', target:swing.undoAction, targetProperty:'enabled')
        swing.bind(source:swing.inputEditor.redoAction, sourceProperty:'enabled', target:swing.redoAction, targetProperty:'enabled')

        if (swing.consoleFrame instanceof java.awt.Window) {
            swing.consoleFrame.pack()
            swing.consoleFrame.show()
        }
        installInterceptor()
        swing.doLater inputArea.&requestFocus
    }


    public void installInterceptor() {
        systemOutInterceptor = new SystemOutputInterceptor(this.&notifySystemOut, true)
        systemOutInterceptor.start()
        systemErrorInterceptor = new SystemOutputInterceptor(this.&notifySystemErr, false)
        systemErrorInterceptor.start()
    }

    void addToHistory(record) {
        history.add(record)
        // history.size here just retrieves method closure
        if (history.size() > maxHistory) {
            history.remove(0)
        }
        // history.size doesn't work here either
        historyIndex = history.size()
        updateHistoryActions()
    }

    // Ensure we don't have too much in console (takes too much memory)
    private ensureNoDocLengthOverflow(doc) {
        // if it is a case of stackOverFlowError, show the exception details from the front
        // as there is no point in showing the repeating details at the back 
        int offset = stackOverFlowError ? maxOutputChars : 0
        if (doc.length > maxOutputChars) {
            doc.remove(offset, doc.length - maxOutputChars)
        }
    }

    // Append a string to the output area
    void appendOutput(String text, AttributeSet style){
        def doc = outputArea.styledDocument
        doc.insertString(doc.length, text, style)
        ensureNoDocLengthOverflow(doc)
    }

    void appendOutput(Window window, AttributeSet style) {
        appendOutput(window.toString(), style)
    }

    void appendOutput(Object object, AttributeSet style) {
        appendOutput(object.toString(), style)
    }

    void appendOutput(Component component, AttributeSet style) {
        SimpleAttributeSet sas = new SimpleAttributeSet();
        sas.addAttribute(StyleConstants.NameAttribute, "component")
        StyleConstants.setComponent(sas, component)
        appendOutput(component.toString(), sas)
    }

    void appendOutput(Icon icon, AttributeSet style) {
        SimpleAttributeSet sas = new SimpleAttributeSet();
        sas.addAttribute(StyleConstants.NameAttribute, "icon")
        StyleConstants.setIcon(sas, icon)
        appendOutput(icon.toString(), sas)
    }

    void appendStacktrace(text) {
        def doc = outputArea.styledDocument

        // split lines by new line separator
        def lines = text.split(/(\n|\r|\r\n|\u0085|\u2028|\u2029)/)

        // Java Identifier regex
        def ji = /([\p{Alnum}_\$][\p{Alnum}_\$]*)/

        // stacktrace line regex
        def stacktracePattern = /\tat $ji(\.$ji)+\((($ji(\.(java|groovy))?):(\d+))\)/

        lines.each { line ->
            int initialLength = doc.length

            def matcher = line =~ stacktracePattern
            def fileName =  matcher.matches() ? matcher[0][-5] : ""

            if (fileName == scriptFile?.name || fileName.startsWith(DEFAULT_SCRIPT_NAME_START)) {
                def fileNameAndLineNumber = matcher[0][-6]
                def length = fileNameAndLineNumber.length()
                def index = line.indexOf(fileNameAndLineNumber)

                def style = hyperlinkStyle
                def hrefAttr = new SimpleAttributeSet()
                // don't pass a GString as it won't be coerced to String as addAttribute takes an Object
                hrefAttr.addAttribute(HTML.Attribute.HREF, "file://" + fileNameAndLineNumber)
                style.addAttribute(HTML.Tag.A, hrefAttr);

                doc.insertString(initialLength,                     line[0..<index],                    stacktraceStyle)
                doc.insertString(initialLength + index,             line[index..<(index + length)],     style)
                doc.insertString(initialLength + index + length,    line[(index + length)..-1] + '\n',  stacktraceStyle)
            } else {
                doc.insertString(initialLength, line + '\n', stacktraceStyle)
            }
        }

        ensureNoDocLengthOverflow(doc)
    }

    // Append a string to the output area on a new line
    void appendOutputNl(text, style) {
        def doc = outputArea.styledDocument
        def len = doc.length
        def alreadyNewLine = (len == 0 || doc.getText(len - 1, 1) == "\n")
        doc.insertString(doc.length, " \n", style)
        if (alreadyNewLine) {
            doc.remove(len, 2) // windows hack to fix (improve?) line spacing
        }
        appendOutput(text, style)
    }

    void appendOutputLines(text, style) {
        appendOutput(text, style)
        def doc = outputArea.styledDocument
        def len = doc.length
        doc.insertString(len, " \n", style)
        doc.remove(len, 2) // windows hack to fix (improve?) line spacing
    }

    // Return false if use elected to cancel
    boolean askToSaveFile() {
        if (scriptFile == null || !dirty) {
            return true
        }
        switch (JOptionPane.showConfirmDialog(frame,
            "Save changes to " + scriptFile.name + "?",
            "GroovyConsole", JOptionPane.YES_NO_CANCEL_OPTION))
        {
            case JOptionPane.YES_OPTION:
                return fileSave()
            case JOptionPane.NO_OPTION:
                return true
            default:
                return false
        }
    }

    void beep() {
        Toolkit.defaultToolkit.beep()
    }

    // Binds the "_" and "__" variables in the shell
    void bindResults() {
        shell.setVariable("_", getLastResult()) // lastResult doesn't seem to work
        shell.setVariable("__", history.collect {it.result})
    }

    // Handles menu event
    static void captureStdOut(EventObject evt) {
        captureStdOut = evt.source.selected
        prefs.putBoolean('captureStdOut', captureStdOut)
    }

    static void captureStdErr(EventObject evt) {
        captureStdErr = evt.source.selected
        prefs.putBoolean('captureStdErr', captureStdErr)
    }
    
    void fullStackTraces(EventObject evt) {
        fullStackTraces = evt.source.selected
        System.setProperty("groovy.full.stacktrace",
            Boolean.toString(fullStackTraces))
        prefs.putBoolean('fullStackTraces', fullStackTraces)
    }

    void showScriptInOutput(EventObject evt) {
        showScriptInOutput = evt.source.selected
        prefs.putBoolean('showScriptInOutput', showScriptInOutput)
    }

    void visualizeScriptResults(EventObject evt) {
        visualizeScriptResults = evt.source.selected
        prefs.putBoolean('visualizeScriptResults', visualizeScriptResults)
    }

    void showToolbar(EventObject evt) {
        showToolbar = evt.source.selected
        prefs.putBoolean('showToolbar', showToolbar)
        toolbar.visible = showToolbar
    }

    void detachedOutput(EventObject evt) {
        def oldDetachedOutput = detachedOutput
        detachedOutput = evt.source.selected
        prefs.putBoolean('detachedOutput', detachedOutput)
        if (oldDetachedOutput != detachedOutput) {
            if (detachedOutput) {
                splitPane.add(blank, JSplitPane.BOTTOM)
                origDividerSize = splitPane.dividerSize
                splitPane.dividerSize = 0
                splitPane.resizeWeight = 1.0
                outputWindow.add(scrollArea, BorderLayout.CENTER)
                prepareOutputWindow()
            } else {
                splitPane.add(scrollArea, JSplitPane.BOTTOM)
                splitPane.dividerSize = origDividerSize
                outputWindow.add(blank, BorderLayout.CENTER)
                outputWindow.visible = false
                splitPane.resizeWeight = 0.5
            }
        }
    }

    void autoClearOutput(EventObject evt) {
        autoClearOutput = evt.source.selected
        prefs.putBoolean('autoClearOutput', autoClearOutput)
    }

    void threadInterruption(EventObject evt) {
        threadInterrupt = evt.source.selected
        prefs.putBoolean('threadInterrupt', threadInterrupt)
        def customizers = config.compilationCustomizers
        customizers.clear()
        if (threadInterrupt) {
            config.addCompilationCustomizers(new ASTTransformationCustomizer(ThreadInterrupt))
        }
    }

    void caretUpdate(CaretEvent e){
        textSelectionStart = Math.min(e.dot,e.mark)
        textSelectionEnd = Math.max(e.dot,e.mark)
        setRowNumAndColNum()
    }

    void clearOutput(EventObject evt = null) {
        outputArea.text = ''
    }

    // If at exit time, a script is running, the user is given an option to interrupt it first
    def askToInterruptScript() {
        if(!scriptRunning) return true
        def rc = JOptionPane.showConfirmDialog(frame, "Script executing. Press 'OK' to attempt to interrupt it before exiting.",
            "GroovyConsole", JOptionPane.OK_CANCEL_OPTION)
        if (rc == JOptionPane.OK_OPTION) {
            doInterrupt()
            return true
        } else {
            return false
        }
    }

    void doInterrupt(EventObject evt = null) {
        runThread?.interrupt()
    }

    void exit(EventObject evt = null) {
        if(askToInterruptScript()) {
            if (askToSaveFile()) {
                if (frame instanceof java.awt.Window) {
                    frame.hide()
                    frame.dispose()
                    outputWindow?.dispose()
                }
                FindReplaceUtility.dispose()
                consoleControllers.remove(this)
                if (!consoleControllers) {
                    systemOutInterceptor.stop()
                    systemErrorInterceptor.stop()
                }
            }
        }
    }

    void fileNewFile(EventObject evt = null) {
        if (askToSaveFile()) {
            scriptFile = null
            setDirty(false)
            inputArea.text = ''
        }
    }

    // Start a new window with a copy of current variables
    void fileNewWindow(EventObject evt = null) {
        Console consoleController = new Console(
            new Binding(
                new HashMap(shell.context.variables)))
        consoleController.systemOutInterceptor = systemOutInterceptor
        consoleController.systemErrorInterceptor = systemErrorInterceptor
        SwingBuilder swing = new SwingBuilder()
        consoleController.swing = swing 
        frameConsoleDelegates.each {k, v -> swing[k] = v}
        swing.controller = consoleController
        swing.build(ConsoleActions)
        swing.build(ConsoleView)
        installInterceptor()
        swing.consoleFrame.pack()
        swing.consoleFrame.show()
        swing.doLater swing.inputArea.&requestFocus
    }

    void fileOpen(EventObject evt = null) {
        def scriptName = selectFilename()
        if (scriptName != null) {
            loadScriptFile(scriptName)
        }
    }

    void loadScriptFile(File file) {
        swing.edt {
            inputArea.editable = false
        }
        swing.doOutside {
            try {
                consoleText = file.readLines().join('\n')
                scriptFile = file
                swing.edt {
                    updateTitle()
                    inputArea.document.remove 0, inputArea.document.length
                    inputArea.document.insertString 0, consoleText, null
                    setDirty(false)
                    inputArea.caretPosition = 0
                }
            } finally {
                swing.edt { inputArea.editable = true }
                // GROOVY-3684: focus away and then back to inputArea ensures caret blinks
                swing.doLater outputArea.&requestFocusInWindow
                swing.doLater inputArea.&requestFocusInWindow
            }
        }
    }

    // Save file - return false if user cancelled save
    boolean fileSave(EventObject evt = null) {
        if (scriptFile == null) {
            return fileSaveAs(evt)
        } else {
            scriptFile.write(inputArea.text)
            setDirty(false)
            return true
        }
    }

    // Save file - return false if user cancelled save
    boolean fileSaveAs(EventObject evt = null) {
        scriptFile = selectFilename("Save")
        if (scriptFile != null) {
            scriptFile.write(inputArea.text)
            setDirty(false)
            return true
        } else {
            return false
        }
    }

    def finishException(Throwable t, boolean executing) {
        if(executing) {
            statusLabel.text = 'Execution terminated with exception.'
            history[-1].exception = t
        } else {
            statusLabel.text = 'Compilation failed.'
        }

        if (t instanceof MultipleCompilationErrorsException) {
            MultipleCompilationErrorsException mcee = t
            ErrorCollector collector = mcee.errorCollector
            int count = collector.errorCount
            appendOutputNl("${count} compilation error${count > 1 ? 's' : ''}:\n\n", commandStyle)

            collector.errors.each { error ->
                if (error instanceof SyntaxErrorMessage) {
                    SyntaxException se = error.cause
                    int errorLine = se.line
                    String message = se.originalMessage

                    String scriptFileName = scriptFile?.name ?: DEFAULT_SCRIPT_NAME_START 

                    def doc = outputArea.styledDocument

                    def style = hyperlinkStyle
                    def hrefAttr = new SimpleAttributeSet()
                    // don't pass a GString as it won't be coerced to String as addAttribute takes an Object
                    hrefAttr.addAttribute(HTML.Attribute.HREF, "file://" + scriptFileName + ":" + errorLine)
                    style.addAttribute(HTML.Tag.A, hrefAttr);

                    doc.insertString(doc.length, message + " at ", stacktraceStyle)
                    doc.insertString(doc.length, "line: ${se.line}, column: ${se.startColumn}\n\n", style)
                } else if (error instanceof Throwable) {
                    reportException(error)
                } else if (error instanceof ExceptionMessage) {
                    reportException(error.cause) 
                }
            }
        } else {
            reportException(t)
        }

        if(!executing) {
            bindResults()
        }

        // GROOVY-4496: set the output window position to the top-left so the exception details are visible from the start
        outputArea.caretPosition = 0 

        if (detachedOutput) {
            prepareOutputWindow()
            showOutputWindow()
        }
    }

    private calcPreferredSize(a, b, c) {
        [c, [a, b].min()].max()
    }

    private reportException(Throwable t) {
        appendOutputNl("Exception thrown\n", commandStyle)

        StringWriter sw = new StringWriter()
        new PrintWriter(sw).withWriter {pw -> StackTraceUtils.deepSanitize(t).printStackTrace(pw) }
        appendStacktrace("\n${sw.buffer}\n")
    }

    def finishNormal(Object result) {
        // Take down the wait/cancel dialog
        history[-1].result = result
        if (result != null) {
            statusLabel.text = 'Execution complete.'
            appendOutputNl("Result: ", promptStyle)
            def obj = (visualizeScriptResults
                ? OutputTransforms.transformResult(result, shell.context._outputTransforms)
                : result.toString())

            // multi-methods are magical!
            appendOutput(obj, resultStyle)
        } else {
            statusLabel.text = 'Execution complete. Result was null.'
        }
        bindResults()
        if (detachedOutput) {
            prepareOutputWindow()
            showOutputWindow()
        }
    }
    
    def compileFinishNormal() {
        statusLabel.text = 'Compilation complete.'
    }

    private def prepareOutputWindow() {
        outputArea.setPreferredSize(null)
        outputWindow.pack()
        outputArea.setPreferredSize([calcPreferredSize(outputWindow.getWidth(), inputEditor.getWidth(), 120),
                calcPreferredSize(outputWindow.getHeight(), inputEditor.getHeight(), 60)] as Dimension)
        outputWindow.pack()
    }

    // Gets the last, non-null result
    def getLastResult() {
        // runtime bugs in here history.reverse produces odd lookup
        // return history.reverse.find {it != null}
        if (!history) {
            return
        }
        for (i in (history.size() - 1)..0) {
            if (history[i].result != null) {
                return history[i].result
            }
        }
        return null
    }

    void historyNext(EventObject evt = null) {
        if (historyIndex < history.size()) {
            setInputTextFromHistory(historyIndex + 1)
        } else {
            statusLabel.text = "Can't go past end of history (time travel not allowed)"
            beep()
        }
    }

    void historyPrev(EventObject evt = null) {
        if (historyIndex > 0) {
            setInputTextFromHistory(historyIndex - 1)
        } else {
            statusLabel.text = "Can't go past start of history"
            beep()
        }
    }

    void inspectLast(EventObject evt = null){
        if (null == lastResult) {
            JOptionPane.showMessageDialog(frame, "The last result is null.",
                "Cannot Inspect", JOptionPane.INFORMATION_MESSAGE)
            return
        }
        ObjectBrowser.inspect(lastResult)
    }

    void inspectVariables(EventObject evt = null) {
        ObjectBrowser.inspect(shell.context.variables)
    }

    void inspectAst(EventObject evt = null) {
        new AstBrowser(inputArea, rootElement, shell.getClassLoader()).run({ inputArea.getText() } )
    }

    void largerFont(EventObject evt = null) {
        updateFontSize(inputArea.font.size + 2)
    }

    static boolean notifySystemOut(String str) {
        if (!captureStdOut) {
            // Output as normal
            return true
        }

        // Put onto GUI
        if (EventQueue.isDispatchThread()) {
            consoleControllers.each {it.appendOutputLines(str, it.outputStyle)}
        }
        else {
            SwingUtilities.invokeLater {
                consoleControllers.each {it.appendOutputLines(str, it.outputStyle)}
            }
        }
        return false
    }

    static boolean notifySystemErr(String str) {
        if (!captureStdErr) {
            // Output as normal
            return true
        }

        // Put onto GUI
        if (EventQueue.isDispatchThread()) {
            consoleControllers.each {it.appendStacktrace(str)}
        }
        else {
            SwingUtilities.invokeLater {
                consoleControllers.each {it.appendStacktrace(str)}
            }
        }
        return false
    }

    // actually run the script

    void runScript(EventObject evt = null) {
        runScriptImpl(false)
    }

    void runSelectedScript(EventObject evt = null) {
        runScriptImpl(true)
    }

    void addClasspathJar(EventObject evt = null) {
        def fc = new JFileChooser(currentClasspathJarDir)
        fc.fileSelectionMode = JFileChooser.FILES_ONLY
        fc.acceptAllFileFilterUsed = true
        if (fc.showDialog(frame, "Add") == JFileChooser.APPROVE_OPTION) {
            currentClasspathJarDir = fc.currentDirectory
            Preferences.userNodeForPackage(Console).put('currentClasspathJarDir', currentClasspathJarDir.path)
            shell.getClassLoader().addURL(fc.selectedFile.toURL())
        }
    }

    void addClasspathDir(EventObject evt = null) {
        def fc = new JFileChooser(currentClasspathDir)
        fc.fileSelectionMode = JFileChooser.DIRECTORIES_ONLY
        fc.acceptAllFileFilterUsed = true
        if (fc.showDialog(frame, "Add") == JFileChooser.APPROVE_OPTION) {
            currentClasspathDir = fc.currentDirectory
            Preferences.userNodeForPackage(Console).put('currentClasspathDir', currentClasspathDir.path)
            shell.getClassLoader().addURL(fc.selectedFile.toURL())
        }
    }

    void clearContext(EventObject evt = null) {
        def binding = new Binding()
        newScript(null, binding)
        // reload output transforms
        binding.variables._outputTransforms = OutputTransforms.loadOutputTransforms()
    }

    private void runScriptImpl(boolean selected) {
        if(scriptRunning) {
            statusLabel.text = 'Cannot run script now as a script is already running. Please wait or use "Interrupt Script" option.'
            return
        }
        scriptRunning = true
        interruptAction.enabled = true
        stackOverFlowError = false // reset this flag before running a script
        def endLine = System.getProperty('line.separator')
        def record = new HistoryRecord( allText: inputArea.getText().replaceAll(endLine, '\n'),
            selectionStart: textSelectionStart, selectionEnd: textSelectionEnd)
        addToHistory(record)
        pendingRecord = new HistoryRecord(allText:'', selectionStart:0, selectionEnd:0)

        if (prefs.getBoolean("autoClearOutput", false)) clearOutput()

        // Print the input text
        if (showScriptInOutput) {
            for (line in record.getTextToRun(selected).tokenize("\n")) {
                appendOutputNl('groovy> ', promptStyle)
                appendOutput(line, commandStyle)
            }
            appendOutputNl(" \n", promptStyle)
        }

        // Kick off a new thread to do the evaluation
        // Run in a thread outside of EDT, this method is usually called inside the EDT
        runThread = Thread.start {
            try {
                SwingUtilities.invokeLater { showExecutingMessage() }
                String name = scriptFile?.name ?: (DEFAULT_SCRIPT_NAME_START + scriptNameCounter++)
                if(beforeExecution) {
                    beforeExecution()
                }
                def result = shell.run(record.getTextToRun(selected), name, [])
                if(afterExecution) {
                    afterExecution()
                }
                SwingUtilities.invokeLater { finishNormal(result) }
            } catch (Throwable t) {
                if(t instanceof StackOverflowError) {
                    // set the flag that will be used in printing exception details in output pane
                    stackOverFlowError = true
                    clearOutput()
                } 
                SwingUtilities.invokeLater { finishException(t, true) }
            } finally {
                runThread = null
                scriptRunning = false
                interruptAction.enabled = false
            }
        }
    }

    void compileScript(EventObject evt = null) {
        if(scriptRunning) {
            statusLabel.text = 'Cannot compile script now as a script is already running. Please wait or use "Interrupt Script" option.'
            return
        }
        stackOverFlowError = false // reset this flag before running a script
        def endLine = System.getProperty('line.separator')
        def record = new HistoryRecord( allText: inputArea.getText().replaceAll(endLine, '\n'),
            selectionStart: textSelectionStart, selectionEnd: textSelectionEnd)

        if (prefs.getBoolean("autoClearOutput", false)) clearOutput()

        // Print the input text
        if (showScriptInOutput) {
            for (line in record.allText.tokenize("\n")) {
                appendOutputNl('groovy> ', promptStyle)
                appendOutput(line, commandStyle)
            }
            appendOutputNl(" \n", promptStyle)
        }

        // Kick off a new thread to do the compilation
        // Run in a thread outside of EDT, this method is usually called inside the EDT
        runThread = Thread.start {
            try {
                SwingUtilities.invokeLater { showCompilingMessage() }
                shell.parse(record.allText)
                SwingUtilities.invokeLater { compileFinishNormal() }
            } catch (Throwable t) {
                SwingUtilities.invokeLater { finishException(t, false) }
            } finally {
                runThread = null
            }
        }
    }
    
    def selectFilename(name = "Open") {
        def fc = new JFileChooser(currentFileChooserDir)
        fc.fileSelectionMode = JFileChooser.FILES_ONLY
        fc.acceptAllFileFilterUsed = true
        fc.fileFilter = groovyFileFilter
        if(name == "Save") {
            fc.selectedFile = new File("*.groovy")
        }
        if (fc.showDialog(frame, name) == JFileChooser.APPROVE_OPTION) {
            currentFileChooserDir = fc.currentDirectory
            Preferences.userNodeForPackage(Console).put('currentFileChooserDir', currentFileChooserDir.path)
            return fc.selectedFile
        } else {
            return null
        }
    }

    void setDirty(boolean newDirty) {
        //TODO when @BoundProperty is live, this should be handled via listeners
        dirty = newDirty
        saveAction.enabled = newDirty
        updateTitle()
    }

    private void setInputTextFromHistory(newIndex) {
        def endLine = System.getProperty('line.separator')
        if (historyIndex >= history.size()) {
            pendingRecord = new HistoryRecord( allText: inputArea.getText().replaceAll(endLine, '\n'),
                selectionStart: textSelectionStart, selectionEnd: textSelectionEnd)
        }
        historyIndex = newIndex
        def record
        if (historyIndex < history.size()) {
            record = history[historyIndex]
            statusLabel.text = "command history ${history.size() - historyIndex}"
        } else {
            record = pendingRecord
            statusLabel.text = 'at end of history'
        }
        inputArea.text = record.allText
        inputArea.selectionStart = record.selectionStart
        inputArea.selectionEnd = record.selectionEnd
        setDirty(true) // Should calculate dirty flag properly (hash last saved/read text in each file)
        updateHistoryActions()
    }

    private void updateHistoryActions() {
        nextHistoryAction.enabled = historyIndex < history.size()
        prevHistoryAction.enabled = historyIndex > 0
    }

    // Adds a variable to the binding
    // Useful for adding variables before opening the console
    void setVariable(String name, Object value) {
        shell.context.setVariable(name, value)
    }

    void showAbout(EventObject evt = null) {
        def version = GroovySystem.getVersion()
        def pane = swing.optionPane()
         // work around GROOVY-1048
        pane.setMessage('Welcome to the Groovy Console for evaluating Groovy scripts\nVersion ' + version)
        def dialog = pane.createDialog(frame, 'About GroovyConsole')
        dialog.show()
    }

    void find(EventObject evt = null) {
        FindReplaceUtility.showDialog()
    }

    void findNext(EventObject evt = null) {
        FindReplaceUtility.FIND_ACTION.actionPerformed(evt)
    }

    void findPrevious(EventObject evt = null) {
        def reverseEvt = new ActionEvent(
            evt.getSource(), evt.getID(),
            evt.getActionCommand(), evt.getWhen(),
            ActionEvent.SHIFT_MASK) //reverse
        FindReplaceUtility.FIND_ACTION.actionPerformed(reverseEvt)
    }

    void replace(EventObject evt = null) {
        FindReplaceUtility.showDialog(true)
    }

    void showMessage(String message) {
        statusLabel.text = message
    }

    void showExecutingMessage() {
        statusLabel.text = 'Script executing now. Please wait or use "Interrupt Script" option.'
    }

    void showCompilingMessage() {
        statusLabel.text = 'Script compiling now. Please wait.'
    }
    
    // Shows the detached 'outputArea' dialog
    void showOutputWindow(EventObject evt = null) {
        if (detachedOutput) {
            outputWindow.setLocationRelativeTo(frame)
            outputWindow.show()
        }
    }

    void hideOutputWindow(EventObject evt = null) {
        if (detachedOutput) {
            outputWindow.visible = false
        }
    }

    void hideAndClearOutputWindow(EventObject evt = null) {
        clearOutput()
        hideOutputWindow()
    }

    void smallerFont(EventObject evt = null){
        updateFontSize(inputArea.font.size - 2)
    }

    void updateTitle() {
        if (frame.properties.containsKey('title')) {
            if (scriptFile != null) {
                frame.title = scriptFile.name + (dirty?" * ":"") + " - GroovyConsole"
            } else {
                frame.title = "GroovyConsole"
            }
        }
    }

    private updateFontSize(newFontSize) {
        if (newFontSize > 40) {
            newFontSize = 40
        } else if (newFontSize < 4) {
            newFontSize = 4
        }
        
        prefs.putInt("fontSize", newFontSize)

        // don't worry, the fonts won't be changed to this family, the styles will only derive from this
        def newFont = new Font(inputEditor.defaultFamily, Font.PLAIN, newFontSize)
        inputArea.font = newFont
        outputArea.font = newFont
    }

    void invokeTextAction(evt, closure, area = inputArea) {
        def source = evt.getSource()
        if (source != null) {
            closure(area)
        }
    }

    void cut(EventObject evt = null) {
        invokeTextAction(evt, { source -> source.cut() })
    }

    void copy(EventObject evt = null) {
        invokeTextAction(evt, { source -> source.copy() }, copyFromComponent ?: inputArea)
    }

    void paste(EventObject evt = null) {
        invokeTextAction(evt, { source -> source.paste() })
    }

    void selectAll(EventObject evt = null) {
        invokeTextAction(evt, { source -> source.selectAll() })
    }

    void setRowNumAndColNum() {
        cursorPos = inputArea.getCaretPosition()
        rowNum = rootElement.getElementIndex(cursorPos) + 1

        def rowElement = rootElement.getElement(rowNum - 1)
        colNum = cursorPos - rowElement.getStartOffset() + 1

        rowNumAndColNum.setText("$rowNum:$colNum")
    }

    void print(EventObject evt = null) {
        inputEditor.printAction.actionPerformed(evt)
    }

    void undo(EventObject evt = null) {
        inputEditor.undoAction.actionPerformed(evt)
    }

    void redo(EventObject evt = null) {
        inputEditor.redoAction.actionPerformed(evt)
    }

    void hyperlinkUpdate(HyperlinkEvent e) {
        if (e.eventType == HyperlinkEvent.EventType.ACTIVATED) {
            // URL of the form: file://myscript.groovy:32
            String url = e.getURL()
            int lineNumber = url[(url.lastIndexOf(':') + 1)..-1].toInteger()

            def editor = inputEditor.textEditor
            def text = editor.text

            int newlineBefore = 0
            int newlineAfter = 0
            int currentLineNumber = 1

            // let's find the previous and next newline surrounding the offending line
            int i = 0
            for (ch in text) {
                if (ch == '\n') {
                    currentLineNumber++
                }
                if (currentLineNumber == lineNumber) {
                    newlineBefore = i
                    def nextNewline = text.indexOf('\n', i + 1)
                    newlineAfter = nextNewline > -1 ? nextNewline : text.length()
                    break
                }
                i++
            }

            // highlight / select the whole line
            editor.setCaretPosition(newlineBefore)
            editor.moveCaretPosition(newlineAfter)
        }
    }

    void componentHidden(ComponentEvent e) { }

    void componentMoved(ComponentEvent e) { }

    void componentResized(ComponentEvent e) {
        def component = e.getComponent()
        prefs.putInt("${component.name}Width", component.width)
        prefs.putInt("${component.name}Height", component.height)
    }

    public void componentShown(ComponentEvent e) { }

    public void focusGained(FocusEvent e) {
        // remember component with focus for text-copy functionality
        if (e.component == outputArea || e.component == inputArea) {
            copyFromComponent = e.component
        }
    }

    public void focusLost(FocusEvent e) { }
}

class GroovyFileFilter extends FileFilter {
    private static final GROOVY_SOURCE_EXTENSIONS = ['*.groovy', '*.gvy', '*.gy', '*.gsh', '*.story', '*.gpp', '*.grunit']
    private static final GROOVY_SOURCE_EXT_DESC = GROOVY_SOURCE_EXTENSIONS.join(',')

    public boolean accept(File f) {
        if (f.isDirectory()) {
            return true
        }
        GROOVY_SOURCE_EXTENSIONS.find {it == getExtension(f)} ? true : false
    }

    public String getDescription() {
        "Groovy Source Files ($GROOVY_SOURCE_EXT_DESC)"
    }
    
    static String getExtension(f) {
        def ext = null;
        def s = f.getName()
        def i = s.lastIndexOf('.')
        if (i > 0 &&  i < s.length() - 1) {
            ext = s.substring(i).toLowerCase()
        }
        "*$ext"
    }
}