001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019package org.crsh.shell.impl.command.system;
020
021import org.crsh.cli.Argument;
022import org.crsh.cli.Command;
023import org.crsh.cli.Usage;
024import org.crsh.cli.descriptor.ParameterDescriptor;
025import org.crsh.cli.spi.Completion;
026import org.crsh.command.BaseCommand;
027import org.crsh.command.InvocationContext;
028import org.crsh.command.ScriptException;
029import org.crsh.lang.script.ScriptRepl;
030import org.crsh.repl.Repl;
031import org.crsh.shell.impl.command.CRaSHSession;
032import org.crsh.text.Color;
033import org.crsh.text.Decoration;
034import org.crsh.text.Style;
035import org.crsh.text.ui.LabelElement;
036import org.crsh.text.ui.RowElement;
037import org.crsh.text.ui.TableElement;
038
039import java.io.IOException;
040import java.util.ArrayList;
041
042/** @author Julien Viet */
043public class repl extends BaseCommand implements ReplCompleter {
044
045  @Usage("list the repl or change the current repl")
046  @Command
047  public void main(
048      InvocationContext<Object> context,
049      @Argument(completer = ReplCompleter.class)
050      @Usage("the optional repl name")
051      String name) throws IOException {
052    CRaSHSession session = (CRaSHSession)context.getSession();
053    Repl current = session.getRepl();
054    if (name != null) {
055      if (name.equals(current.getName())) {
056        context.provide("Using repl " + name);
057      } else {
058        Repl found = null;
059        if ("script".equals(name)) {
060          found = ScriptRepl.getInstance();
061        } else {
062          for (Repl repl : session.crash.getContext().getPlugins(Repl.class)) {
063            if (repl.getName().equals(name)) {
064              if (repl.isActive()) {
065                found = repl;
066                break;
067              } else {
068                throw new ScriptException("Repl " + name + " is not active");
069              }
070            }
071          }
072        }
073        if (found != null) {
074          session.setRepl(found);
075          context.provide("Using repl " + name);
076        } else {
077          throw new ScriptException("Repl " + name + " not found");
078        }
079      }
080    } else {
081
082      //
083      ArrayList<Repl> repls = new ArrayList<Repl>();
084      repls.add(ScriptRepl.getInstance());
085      for (Repl repl : session.crash.getContext().getPlugins(Repl.class)) {
086        repls.add(repl);
087      }
088
089      //
090      TableElement table = new TableElement().rightCellPadding(1);
091      table.add(
092          new RowElement().
093              add(new LabelElement("NAME").style(Style.style(Decoration.bold))).
094              add(new LabelElement("DESCRIPTION")).
095              add(new LabelElement("ACTIVE")));
096      for (Repl repl : repls) {
097        table.add(
098            new RowElement().
099                add(new LabelElement(repl.getName()).style(Style.style(Color.red))).
100                add(new LabelElement(repl.getDescription())).
101                add(new LabelElement(repl.isActive())));
102      }
103
104      //
105      context.provide(new LabelElement("Current repl is \" + current.getName() + \"available repl are:\n"));
106      context.provide(table);
107    }
108  }
109
110  @Override
111  public Completion complete(ParameterDescriptor parameter, String prefix) throws Exception {
112    CRaSHSession session = (CRaSHSession)context.getSession();
113    Completion.Builder builder = Completion.builder(prefix);
114    if ("script".startsWith(prefix)) {
115      builder.add("script".substring(prefix.length()), true);
116    }
117    for (Repl repl : session.crash.getContext().getPlugins(Repl.class)) {
118      String name = repl.getName();
119      if (name.startsWith(prefix)) {
120        builder.add(name.substring(prefix.length()), true);
121      }
122    }
123    return builder.build();
124  }
125}