org.codehaus.groovy.tools.shell.PatchedCandidateListCompletionHandler.groovy Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of groovy-all Show documentation
Show all versions of groovy-all Show documentation
Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
import groovy.transform.CompileStatic
import jline.console.ConsoleReader
import jline.console.CursorBuffer
import jline.console.completer.CandidateListCompletionHandler
import org.codehaus.groovy.tools.shell.util.JAnsiHelper
/**
* jline completion handler displays ANSIfied candidates nicely,
* but does not de-ANSIfy when adding to the prompt :-(
*
* So this class just adds this functionality.
*
* See https://github.com/jline/jline2/issues/132
*/
@CompileStatic
class PatchedCandidateListCompletionHandler extends CandidateListCompletionHandler {
public boolean complete(final ConsoleReader reader, final List candidates, final int pos) throws
IOException
{
CursorBuffer buf = reader.getCursorBuffer();
final List deAnsifiedcandidates = candidates.collect({CharSequence candidate -> JAnsiHelper.stripAnsi(candidate) })
// if there is only one completion, then fill in the buffer
if (candidates.size() == 1) {
CharSequence value = deAnsifiedcandidates.get(0);
// fail if the only candidate is the same as the current buffer
if (value.equals(buf.toString())) {
return false;
}
setBuffer(reader, value, pos);
return true;
}
else if (candidates.size() > 1) {
String value = this.getUnambiguousCompletions(deAnsifiedcandidates);
setBuffer(reader, value, pos);
}
printCandidates(reader, candidates);
// redraw the current console buffer
reader.drawLine();
return true;
}
/**
* copied from CandidateListCompletionHandler because it was private :-(
* Returns a root that matches all the {@link String} elements of the specified {@link List},
* or null if there are no commonalities. For example, if the list contains
* foobar, foobaz, foobuz, the method will return foob.
*/
private String getUnambiguousCompletions(final List candidates) {
if (candidates == null || candidates.isEmpty()) {
return null;
}
// convert to an array for speed
String[] strings = candidates.toArray(new String[candidates.size()]);
String first = strings[0];
StringBuilder candidate = new StringBuilder();
for (int i = 0; i < first.length(); i++) {
if (startsWith(first.substring(0, i + 1), strings)) {
candidate.append(first.charAt(i));
}
else {
break;
}
}
return candidate.toString();
}
/**
* copied from CandidateListCompletionHandler because it was private :-(
* @return true is all the elements of candidates start with starts
*/
private boolean startsWith(final String starts, final String[] candidates) {
for (String candidate : candidates) {
if (!candidate.startsWith(starts)) {
return false;
}
}
return true;
}
}