| // 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 com.google.errorprone.annotations.CanIgnoreReturnValue; |
| import java.io.IOException; |
| |
| /** |
| * Wrap an {@link AnsiTerminalWriter} into one that is aware of the position |
| * within the current line. Newline characters, which presumably are supposed |
| * to end a line, are translated into calls to the {@link AnsiTerminalWriter#newline()} |
| * method. |
| */ |
| public class PositionAwareAnsiTerminalWriter implements AnsiTerminalWriter { |
| |
| private final AnsiTerminalWriter terminalWriter; |
| private int position; |
| |
| public PositionAwareAnsiTerminalWriter(AnsiTerminalWriter terminalWriter) { |
| this.terminalWriter = terminalWriter; |
| this.position = 0; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public AnsiTerminalWriter append(String text) throws IOException { |
| int i = 0; |
| while (i < text.length()) { |
| int next = text.indexOf('\n', i); |
| if (next == -1) { |
| terminalWriter.append(text.substring(i)); |
| position += text.length() - i; |
| i = text.length(); |
| } else { |
| terminalWriter.append(text.substring(i, next)); |
| terminalWriter.newline(); |
| i = next + 1; |
| position = 0; |
| } |
| } |
| |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public AnsiTerminalWriter newline() throws IOException { |
| terminalWriter.newline(); |
| position = 0; |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public AnsiTerminalWriter okStatus() throws IOException { |
| terminalWriter.okStatus(); |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public AnsiTerminalWriter failStatus() throws IOException { |
| terminalWriter.failStatus(); |
| return this; |
| } |
| |
| @CanIgnoreReturnValue |
| @Override |
| public AnsiTerminalWriter normal() throws IOException { |
| terminalWriter.normal(); |
| return this; |
| } |
| |
| public int getPosition() { |
| return position; |
| } |
| } |