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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.util.io;
import java.io.IOException;
/**
* Wrap an {@link AnsiTerminalWriter} into one that breaks lines to use
* at most a first given number of columns of the terminal. In this way,
* all line breaks are predictable, even if we only have a lower bound
* on the number of columns of the underlying terminal. To simplify copy
* and paste of the terminal output, a continuation character is written
* into the last usable column when we break a line. Additionally, newline
* characters are translated into calls to the {@link AnsiTerminalWriter#newline()}
* method.
*/
public class LineWrappingAnsiTerminalWriter implements AnsiTerminalWriter {
private final AnsiTerminalWriter terminalWriter;
private final int width;
private final char continuationCharacter;
private int position;
public LineWrappingAnsiTerminalWriter(
AnsiTerminalWriter terminalWriter, int width, char continuationCharacter) {
this.terminalWriter = terminalWriter;
this.width = width;
this.continuationCharacter = continuationCharacter;
this.position = 0;
}
public LineWrappingAnsiTerminalWriter(AnsiTerminalWriter terminalWriter, int width) {
this(terminalWriter, width, '\\');
}
private void appendChar(char c) throws IOException {
if (c == '\n') {
terminalWriter.newline();
position = 0;
} else if (position + 1 < width) {
terminalWriter.append(Character.toString(c));
position++;
} else {
// The last usable character of the line was already been written,
// hence we have to start a continuation before writing the symbol.
terminalWriter.append(Character.toString(continuationCharacter));
terminalWriter.newline();
terminalWriter.append(Character.toString(c));
position = 1;
}
}
@Override
public AnsiTerminalWriter append(String text) throws IOException {
for (int i = 0; i < text.length(); i++) {
appendChar(text.charAt(i));
}
return this;
}
@Override
public AnsiTerminalWriter newline() throws IOException {
terminalWriter.newline();
position = 0;
return this;
}
@Override
public AnsiTerminalWriter okStatus() throws IOException {
terminalWriter.okStatus();
return this;
}
@Override
public AnsiTerminalWriter failStatus() throws IOException {
terminalWriter.failStatus();
return this;
}
@Override
public AnsiTerminalWriter normal() throws IOException {
terminalWriter.normal();
return this;
}
}
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