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137 changes: 137 additions & 0 deletions
137
src/main/java/org/fusesource/jansi/internal/MingwSupport.java
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| /* | ||
| * Copyright (C) 2009-2023 the original author(s). | ||
| * | ||
| * 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 org.fusesource.jansi.internal; | ||
|
|
||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.File; | ||
| import java.io.FileDescriptor; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.Field; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| /** | ||
| * Support for MINGW terminals. | ||
| * Those terminals do not use the underlying windows terminal and there's no CLibrary available | ||
| * in these environments. We have to rely on calling {@code stty.exe} and {@code tty.exe} to | ||
| * obtain the terminal name and width. | ||
| */ | ||
| public class MingwSupport { | ||
|
|
||
| private final String sttyCommand; | ||
| private final String ttyCommand; | ||
| private final Pattern columnsPatterns; | ||
|
|
||
| public MingwSupport() { | ||
| String tty = null; | ||
| String stty = null; | ||
| String path = System.getenv("PATH"); | ||
| if (path != null) { | ||
| String[] paths = path.split(File.pathSeparator); | ||
| for (String p : paths) { | ||
| File ttyFile = new File(p, "tty.exe"); | ||
| if (tty == null && ttyFile.canExecute()) { | ||
| tty = ttyFile.getAbsolutePath(); | ||
| } | ||
| File sttyFile = new File(p, "stty.exe"); | ||
| if (stty == null && sttyFile.canExecute()) { | ||
| stty = sttyFile.getAbsolutePath(); | ||
| } | ||
| } | ||
| } | ||
| if (tty == null) { | ||
| tty = "tty.exe"; | ||
| } | ||
| if (stty == null) { | ||
| stty = "stty.exe"; | ||
| } | ||
| ttyCommand = tty; | ||
| sttyCommand = stty; | ||
| // Compute patterns | ||
| columnsPatterns = Pattern.compile("\\b" + "columns" + "\\s+(\\d+)\\b"); | ||
| } | ||
|
|
||
| public String getConsoleName(boolean stdout) { | ||
| try { | ||
| Process p = new ProcessBuilder(ttyCommand) | ||
| .redirectInput(getRedirect(stdout ? FileDescriptor.out : FileDescriptor.err)) | ||
| .start(); | ||
| String result = waitAndCapture(p); | ||
| if (p.exitValue() == 0) { | ||
| return result.trim(); | ||
| } | ||
| } catch (Throwable t) { | ||
| if ("java.lang.reflect.InaccessibleObjectException" | ||
| .equals(t.getClass().getName())) { | ||
| System.err.println("MINGW support requires --add-opens java.base/java.lang=ALL-UNNAMED"); | ||
| } | ||
| // ignore | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| public int getTerminalWidth(String name) { | ||
| try { | ||
| Process p = new ProcessBuilder(sttyCommand, "-F", name, "-a").start(); | ||
| String result = waitAndCapture(p); | ||
| if (p.exitValue() != 0) { | ||
| throw new IOException("Error executing '" + sttyCommand + "': " + result); | ||
| } | ||
| Matcher matcher = columnsPatterns.matcher(result); | ||
| if (matcher.find()) { | ||
| return Integer.parseInt(matcher.group(1)); | ||
| } | ||
| throw new IOException("Unable to parse columns"); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
|
||
| private static String waitAndCapture(Process p) throws IOException, InterruptedException { | ||
| ByteArrayOutputStream bout = new ByteArrayOutputStream(); | ||
| try (InputStream in = p.getInputStream(); | ||
| InputStream err = p.getErrorStream()) { | ||
| int c; | ||
| while ((c = in.read()) != -1) { | ||
| bout.write(c); | ||
| } | ||
| while ((c = err.read()) != -1) { | ||
| bout.write(c); | ||
| } | ||
| p.waitFor(); | ||
| } | ||
| return bout.toString(); | ||
| } | ||
|
|
||
| /** | ||
| * This requires --add-opens java.base/java.lang=ALL-UNNAMED | ||
| */ | ||
| private ProcessBuilder.Redirect getRedirect(FileDescriptor fd) throws ReflectiveOperationException { | ||
| // This is not really allowed, but this is the only way to redirect the output or error stream | ||
| // to the input. This is definitely not something you'd usually want to do, but in the case of | ||
| // the `tty` utility, it provides a way to get | ||
| Class<?> rpi = Class.forName("java.lang.ProcessBuilder$RedirectPipeImpl"); | ||
| Constructor<?> cns = rpi.getDeclaredConstructor(); | ||
| cns.setAccessible(true); | ||
| ProcessBuilder.Redirect input = (ProcessBuilder.Redirect) cns.newInstance(); | ||
| Field f = rpi.getDeclaredField("fd"); | ||
| f.setAccessible(true); | ||
| f.set(input, fd); | ||
| return input; | ||
| } | ||
| } |