CLI.java

package com.feisystems.tools.github.issue;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.lang.StringUtils;

public class CLI {

	public static final String TOOL_NAME = "GitHub Issue Exporter";

	public static final String ARG_HELP = "h";
	public static final String ARG_HELP_LONG = "help";
	public static final String ARG_HELP_DESC = "show help.";

	public static final String ARG_ACCESS_TOKEN_ARGNAME = "accessToken";
	public static final String ARG_ACCESS_TOKEN = "t";
	public static final String ARG_ACCESS_TOKEN_LONG = "token";
	public static final String ARG_ACCESS_TOKEN_DESC = "enter the OAuth access token generated by GitHub for authentication";

	public static final String ARG_USER_ARGNAME = "userName";
	public static final String ARG_USER = "u";
	public static final String ARG_USER_LONG = "user";
	public static final String ARG_USER_DESC = "enter the username that owns the repository";

	public static final String ARG_REPO_ARGNAME = "repositoryName";
	public static final String ARG_REPO = "r";
	public static final String ARG_REPO_LONG = "repo";
	public static final String ARG_REPO_DESC = "enter the repository name";

	public static final String ARG_WRITE_FILE_PATH_ARGNAME = "absolueWriteFolderPath";
	public static final String ARG_WRITE_FILE_PATH = "p";
	public static final String ARG_WRITE_FILE_PATH_LONG = "path";
	public static final String ARG_WRITE_FILE_PATH_DESC = "enter the absolute folder path for the output file \"GitHubIssueExport-YYYY-MM-DD-HH-MM.xlsx\" will be created (e.g. C:\\git-issues\\)";

	@SuppressWarnings("static-access")
	public static Config getConfig(String[] args) {
		Config config = new Config();
		CommandLineParser parser = new GnuParser();
		Options options = new Options();
		options.addOption(ARG_HELP, ARG_HELP_LONG, false, ARG_HELP_DESC);
		Option accessTokenOption = OptionBuilder
				.withArgName(ARG_ACCESS_TOKEN_ARGNAME).hasArg()
				.withDescription(ARG_ACCESS_TOKEN_DESC)
				.withLongOpt(ARG_ACCESS_TOKEN_LONG).create(ARG_ACCESS_TOKEN);
		options.addOption(accessTokenOption);
		Option userOption = OptionBuilder.withArgName(ARG_USER_ARGNAME)
				.hasArg().withDescription(ARG_USER_DESC)
				.withLongOpt(ARG_USER_LONG).create(ARG_USER);
		options.addOption(userOption);
		Option repoOption = OptionBuilder.withArgName(ARG_REPO_ARGNAME)
				.hasArg().withDescription(ARG_REPO_DESC)
				.withLongOpt(ARG_REPO_LONG).create(ARG_REPO);
		options.addOption(repoOption);
		Option writeFilePathOption = OptionBuilder
				.withArgName(ARG_WRITE_FILE_PATH_ARGNAME).hasArg()
				.withDescription(ARG_WRITE_FILE_PATH_DESC)
				.withLongOpt(ARG_WRITE_FILE_PATH_LONG)
				.create(ARG_WRITE_FILE_PATH);
		options.addOption(writeFilePathOption);
		CommandLine cmd = null;
		try {
			cmd = parser.parse(options, args);
		} catch (ParseException e) {
			help(options);
			throw new RuntimeException(e);
		}

		String accessToken = cmd.getOptionValue(ARG_ACCESS_TOKEN_LONG);
		String user = cmd.getOptionValue(ARG_USER_LONG);
		String repo = cmd.getOptionValue(ARG_REPO_LONG);
		String writeFilePath = cmd.getOptionValue(ARG_WRITE_FILE_PATH_LONG);
		if (StringUtils.isBlank(accessToken) || StringUtils.isBlank(user)
				|| StringUtils.isBlank(repo)
				|| StringUtils.isBlank(writeFilePath)) {
			help(options);
			throw new RuntimeException("Missing arguments!");
		}
		if (cmd.hasOption(ARG_HELP_LONG)) {
			help(options);
		}
		config.setAccessToken(accessToken);
		config.setUser(user);
		config.setRepo(repo);
		config.setWriteFilePath(writeFilePath);
		return config;
	}

	private static void help(Options options) {
		HelpFormatter formater = new HelpFormatter();
		formater.printHelp(TOOL_NAME, options);
	}
}