Run.java

/**
 *  Copyright 2011 Oliver Buchtala
 *
 *	This file is part of ndogen.
 *
 *  ndogen is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ndogen is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with ndogen.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.ndogen.watch;

import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;

import org.ndogen.converter.Markdown2Html;
import org.ndogen.watch.task.ContentProvider;
import org.ndogen.watch.task.Template;
import org.ndogen.watch.task.WriteFile;

public class Run {
	
	enum FileFormat {
		Markdown,
		Html
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		if(args.length == 0) {
			displayHelp();
			System.exit(0);
		}
		
		String _inputFile;
		
		boolean writeOutputFile = false;
		String _outputFile = "";
		
		FileFormat inputFormat = FileFormat.Markdown;
		FileFormat outputFormat = FileFormat.Html;

		boolean useTemplate = false;
		String templateFile = "";
		
		for (int i = 0; i < args.length-1; i++) {
			if(args[i].equals("-o")) {
				i++;
				_outputFile = args[i];
				writeOutputFile = true;
			} else if(args[i].equals("--to")) {
				i++;
				String toFormat = args[i];
				if(toFormat.equals("html")) {
					outputFormat = FileFormat.Html;
				} else {
					error("Unsupported output format: " + toFormat);
				}
				_outputFile = args[i];
				writeOutputFile = true;
			} else if(args[i].equals("--template")) {
				i++;
				useTemplate = true;
				templateFile = args[i];
				if(!fileExists(templateFile)) {
					error("Could not find temlpate file: " + templateFile);
				}
			}
		}
		_inputFile = args[args.length-1];
						
		File inputFile = new File(_inputFile);
		if(!inputFile.exists()) {
			error("File does not exist: " + inputFile);
		}
		
		// TODO: later also handle other modes
		// writing to file is going to be default 
		if(!writeOutputFile) {
			String parent = inputFile.getParent();
			String name = inputFile.getName() + ".html";
			_outputFile = parent + File.separator + name;
		}
		
		ContentProvider input = null;
		if(inputFormat == FileFormat.Markdown && outputFormat == FileFormat.Html) {
			input = new Markdown2Html(new FileContentProvider(_inputFile));
		} else {
			error("Sorry. Unsupported mode: " + inputFormat.toString() + " -> " + outputFormat.toString());
		}
		
		if(useTemplate) {
			input = new Template(input, templateFile);
		}

		Runnable processor = null;
		if(writeOutputFile) {
			processor = new WriteFile(new File(_outputFile), input);
		} else {
			error("Sorry. Unsupported mode.");
		}
		
		FileWatcher watcher = new FileWatcher(_inputFile, processor);
		new Thread(watcher).start();
	}

	public static void displayHelp() {
		StringWriter sw = new StringWriter();
		PrintWriter w = new PrintWriter(sw);

		w.println("java -jar ndogen.guard <OPTIONS> <FILENAME>");
		w.println();
		
		w.println("Options:");
		w.println("    -o:       output file");
		w.println("    --from:   input format");
		w.println("    --to:     output format");
		
		System.out.println(sw.toString());
	}
	
	public static boolean fileExists(String file) {
		return new File(file).exists();
	}
	
	public static void error(String msg) {
		System.err.println(msg);
		displayHelp();
		System.exit(0);
	}
}