ductive.console.shell.EmbeddedAppShell.java Source code

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Here is the source code for ductive.console.shell.EmbeddedAppShell.java

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/*
Copyright (c) 2014 code.fm
    
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
   in the Software without restriction, including without limitation the rights
   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   copies of the Software, and to permit persons to whom the Software is
   furnished to do so, subject to the following conditions:
    
   The above copyright notice and this permission notice shall be included in all
   copies or substantial portions of the Software.
    
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   SOFTWARE.
 */
package ductive.console.shell;

import java.io.IOException;
import java.io.PrintStream;

import javax.inject.Provider;

import org.apache.commons.lang3.StringUtils;
import org.fusesource.jansi.Ansi;
import org.fusesource.jansi.Ansi.Color;

import ductive.commons.Names;
import ductive.console.commands.parser.CmdParser;
import ductive.console.commands.parser.model.CommandLine;
import ductive.console.commands.register.CommandContext;
import ductive.console.commands.register.CommandInvoker;
import ductive.console.config.StandardPromptProvider;
import ductive.parse.errors.NoMatchException;
import jline.console.UserInterruptException;

public class EmbeddedAppShell implements Shell {

    private static final Ansi DEFAULT_STANDARD_PROMPT = new Ansi().reset().bold().fg(Color.MAGENTA).a("app> ")
            .reset();

    private static final String HISTORY_KEY = Names.from(EmbeddedAppShell.class, "history");

    private CommandInvoker commandInvoker;
    private HistoryProvider historyProvider;
    private Provider<CmdParser> cmdParserProvider;
    private StandardPromptProvider standardPromptProvider = new StandardPromptProvider() {
        @Override
        public Ansi get() {
            return DEFAULT_STANDARD_PROMPT;
        }
    };

    @Override
    public void execute(InteractiveTerminal terminal, TerminalUser user) throws IOException {
        CmdParser cmdParser = cmdParserProvider.get();
        try (ShellHistory history = historyProvider.history(HISTORY_KEY)) {
            ShellSettings settings = new StaticShellSettings(standardPromptProvider, cmdParser, history);
            terminal.updateSettings(settings);

            while (true) {
                Integer result = execute(cmdParser, terminal, history, user);
                if (result != null)
                    break;
            }
        }
    }

    private Integer execute(CmdParser cmdParser, InteractiveTerminal terminal, ShellHistory history,
            TerminalUser user) throws IOException {
        final CommandLine line;
        try {
            String command = terminal.readLine();

            if (command == null)
                return 0;

            if (StringUtils.isBlank(command))
                return null;

            line = cmdParser.parse(command);
        } catch (NoMatchException e) {
            terminal.errorln(e.getMessage());
            return null;
        }

        try {
            commandInvoker.execute(new CommandContext(terminal, user), line);
        } catch (UserInterruptException e) {
        } catch (Throwable e) {
            // Unroll invoker exceptions
            if (e.getClass().getCanonicalName().equals("org.codehaus.groovy.runtime.InvokerInvocationException")) {
                e = e.getCause();
            }

            PrintStream ps = new PrintStream(terminal.error());
            e.printStackTrace(ps);
            ps.flush();
        }
        return null;
    }

    public void setCmdParserProvider(Provider<CmdParser> cmdParserProvider) {
        this.cmdParserProvider = cmdParserProvider;
    }

    public void setCommandInvoker(CommandInvoker commandInvoker) {
        this.commandInvoker = commandInvoker;
    }

    public void setHistoryProvider(HistoryProvider historyProvider) {
        this.historyProvider = historyProvider;
    }

    public void setStandardPromptProvider(StandardPromptProvider standardPromptProvider) {
        this.standardPromptProvider = standardPromptProvider;
    }

}