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Groovy example source code file (EditCommand.groovy)

This example Groovy source code file (EditCommand.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

commandsupport, commandsupport, editcommand, editcommand, editor, editor, executing, list, object, object, string, unable, using, waiting

The Groovy EditCommand.groovy source code

/*
 * Copyright 2003-2007 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 org.codehaus.groovy.tools.shell.commands

import org.codehaus.groovy.tools.shell.CommandSupport
import org.codehaus.groovy.tools.shell.Shell
import org.codehaus.groovy.tools.shell.util.Preferences

/**
 * The 'edit' command.
 *
 * @version $Id: EditCommand.groovy 21140 2010-11-28 19:50:55Z hamletdrc $
 * @author <a href="mailto:jason@planet57.com">Jason Dillon
 */
class EditCommand
    extends CommandSupport
{
    EditCommand(final Shell shell) {
        super(shell, 'edit', '\\e')
    }
    
    private String getEditorCommand() {
        def editor = Preferences.editor;

        log.debug("Using editor: $editor")

        if (!editor) {
            fail("Unable to determine which editor to use; check \$EDITOR") // TODO: i18n
        }
        
        return editor
    }
    
    Object execute(final List args) {
        assertNoArguments(args)
        
        def file = File.createTempFile('groovysh-buffer', '.groovy')
        file.deleteOnExit()
        
        try {
            // Write the current buffer to a tmp file
            file.write(buffer.join(NEWLINE))
            
            // Try to launch the editor
            def cmd = "$editorCommand $file"
            log.debug("Executing: $cmd")
            def p = cmd.execute()
            
            // Wait for it to finish
            log.debug("Waiting for process: $p")
            p.waitFor()

            log.debug("Editor contents: ${file.text}")
            
            // Load the new lines...
            file.eachLine {
                shell << it
            }
        }
        finally {
            file.delete()
        }
    }
}

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