001/*
002 * (C) Copyright 2006-2007 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 *
019 * $Id$
020 */
021
022package org.nuxeo.shell.cmds.completors;
023
024import java.util.List;
025
026import jline.ArgumentCompletor.WhitespaceArgumentDelimiter;
027import jline.Completor;
028
029import org.nuxeo.shell.CommandType;
030import org.nuxeo.shell.Shell;
031import org.nuxeo.shell.cmds.Interactive;
032
033/**
034 * @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
035 */
036public class ShellCompletor implements Completor {
037
038    private final Interactive interactive;
039
040    private final CommandCompletor completor;
041
042    public ShellCompletor(Interactive interactive) {
043        this.interactive = interactive;
044        completor = new CommandCompletor(interactive.getShell());
045    }
046
047    @SuppressWarnings("rawtypes")
048    public int complete(String buffer, int cursor, List candidates) {
049        jline.ArgumentCompletor.ArgumentList list = new WhitespaceArgumentDelimiter().delimit(buffer, cursor);
050        String[] args = list.getArguments();
051        // the current arg text (null if empty - i.e. after a space)
052        String argText = list.getCursorArgument();
053        // the offset of the current arg
054        int argIndex = list.getCursorArgumentIndex();
055        // the offset of the next character relative to the cursor in the
056        // current arg
057        int offset = list.getArgumentPosition();
058        // the leading text in the current arg
059        String text = argText == null ? null : argText.substring(0, offset);
060        if (argIndex == 0) {
061            int ret = completor.complete(text, offset, candidates);
062            return ret + (list.getBufferPosition() - offset);
063        } else {
064            Shell shell = interactive.getShell();
065            CommandType cmd = shell.getActiveRegistry().getCommandType(args[0]);
066            if (cmd == null) { // no such command
067                return -1;
068            }
069            if (argIndex >= args.length) {
070                // at the beginning of a new token
071                String[] newArgs = new String[args.length + 1];
072                System.arraycopy(args, 0, newArgs, 0, args.length);
073                newArgs[args.length] = "";
074                args = newArgs;
075            } else if (argIndex < args.length) { // TODO
076                String[] newArgs = new String[argIndex + 1];
077                System.arraycopy(args, 0, newArgs, 0, newArgs.length);
078                args = newArgs;
079            }
080            Completor comp = cmd.getLastTokenCompletor(shell, args);
081            if (comp != null) {
082                int ret = comp.complete(text, offset, candidates);
083                return ret + (list.getBufferPosition() - offset);
084            }
085            return -1;
086        }
087    }
088
089}