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Copyright (c) 2009-2011 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 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.sonatype.gshell.commands.standard;
Display history.

Jason Dillon
public class HistoryCommand
    extends CommandActionSupport
    @Option(name = "c", longName = "clear")
    private boolean clear;
    @Option(name = "p", longName = "purge")
    private boolean purge;
    private Integer last;
    public Object execute(final CommandContext contextthrows Exception {
        assert context != null;
        History history = context.getShell().getHistory();
        if () {
            .debug("History cleared");
        if () {
            .debug("History purged");
        return displayEntries(context);
    private Object displayEntries(final CommandContext contextthrows Exception {
        assert context != null;
        IO io = context.getIo();
        History history = context.getShell().getHistory();
        .debug("History size: {}"history.size());
        int i = 0;
        if ( != null) {
            i = history.size() - ;
            if (i < 0) {
                i = 0;
        .debug("Starting with entry: {}"i);
        ListIterator<History.Entryentries = history.entries(i);
        while (entries.hasNext()) {
            History.Entry entry =;
            renderElement(ioentry.index(), entry.value());
        return .;
    private void renderElement(final IO iofinal int ifinal CharSequence element) {
        String index = String.format("%3d"i + 1);
        io.println("  @|bold {}|@ {}"indexelement);
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