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f1c29633fb
Add the "shell" command which lets you run multiple other command in a single session, sparing you the initialization costs for all but the first of them. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=188712815
93 lines
2.8 KiB
Java
93 lines
2.8 KiB
Java
// Copyright 2018 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.tools;
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import static java.nio.charset.StandardCharsets.US_ASCII;
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import com.beust.jcommander.Parameters;
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import com.google.common.annotations.VisibleForTesting;
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import com.google.common.collect.ImmutableList;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.StreamTokenizer;
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import java.io.StringReader;
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/**
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* Implements a tiny shell interpreter for the nomulus tool.
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*
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* <p>Parses a very simple command grammar. Tokens are either whitespace delimited words or
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* double-quoted strings.
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*/
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@Parameters(commandDescription = "Run an interactive shell")
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public class ShellCommand implements Command {
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private final CommandRunner runner;
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private final BufferedReader lineReader;
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ShellCommand(InputStream in, CommandRunner runner) {
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this.runner = runner;
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this.lineReader = new BufferedReader(new InputStreamReader(in, US_ASCII));
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}
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/** Run the shell until the user presses "Ctrl-D". */
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@Override
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public void run() {
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String line;
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while ((line = getLine()) != null) {
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String[] lineArgs = parseCommand(line);
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try {
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runner.run(lineArgs);
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} catch (Exception e) {
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System.err.println("Got an exception:\n" + e);
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}
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}
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}
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private String getLine() {
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if (System.console() != null) {
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System.err.print("nom> ");
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}
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try {
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return lineReader.readLine();
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} catch (IOException e) {
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return null;
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}
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}
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@VisibleForTesting
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static String[] parseCommand(String line) {
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ImmutableList.Builder<String> resultBuilder = new ImmutableList.Builder<>();
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// Create a tokenizer, make everything word characters except quoted strings and unprintable
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// ascii chars and space (just treat them all as whitespace).
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StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(line));
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tokenizer.resetSyntax();
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tokenizer.whitespaceChars(0, ' ');
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tokenizer.wordChars('!', '~');
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tokenizer.quoteChar('"');
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try {
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while (tokenizer.nextToken() != StreamTokenizer.TT_EOF) {
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resultBuilder.add(tokenizer.sval);
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}
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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return resultBuilder.build().toArray(new String[0]);
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}
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}
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