Cleaned up structure.

src/main/java/nl/andrewlalis/human_task_distributor/FileParser.java

@@ -5,8 +5,11 @@ import org.apache.commons.csv.CSVRecord;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Paths;
 import java.util.*;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import static nl.andrewlalis.human_task_distributor.HumanTaskDistributor.CSV_FORMAT;
 
@@ -74,4 +77,20 @@ public class FileParser {
 		}
 		return previousDistributions;
 	}
+
+	public Set<Task> parseTaskList(String path, String regex) {
+		try {
+			String contents = String.join(" ", Files.readAllLines(Paths.get(path), StandardCharsets.UTF_8));
+			Pattern pattern = Pattern.compile(regex);
+			Matcher matcher = pattern.matcher(contents);
+			Set<Task> tasks = new HashSet<>();
+			while (matcher.find()) {
+				tasks.add(new Task(matcher.group()));
+			}
+			return tasks;
+		} catch (Exception e) {
+			e.printStackTrace();
+			return new HashSet<>();
+		}
+	}
 }

src/main/java/nl/andrewlalis/human_task_distributor/FileWriter.java

@@ -0,0 +1,38 @@
+package nl.andrewlalis.human_task_distributor;
+
+import org.apache.commons.csv.CSVPrinter;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
+
+import static nl.andrewlalis.human_task_distributor.HumanTaskDistributor.CSV_FORMAT;
+
+public class FileWriter {
+
+	public void write(Map<Human, Set<Task>> taskDistributions, String filePath) throws IOException {
+		CSVPrinter printer = new CSVPrinter(Files.newBufferedWriter(Paths.get(filePath), StandardCharsets.UTF_8), CSV_FORMAT);
+		for (Map.Entry<Human, Set<Task>> entry : taskDistributions.entrySet()) {
+			Human human = entry.getKey();
+			Set<Task> assignedTasks = entry.getValue();
+			List<Task> sortedTasks = assignedTasks.stream().sorted(Comparator.comparing(Task::getName)).collect(Collectors.toList());
+			for (Task task : sortedTasks) {
+				printer.printRecord(human.getName(), task.getName());
+			}
+		}
+		printer.close(true);
+	}
+
+	public void write(Set<Task> tasks, String filePath) throws IOException {
+		CSVPrinter printer = new CSVPrinter(Files.newBufferedWriter(Paths.get(filePath), StandardCharsets.UTF_8), CSV_FORMAT);
+		List<Task> orderedTasks = new ArrayList<>(tasks);
+		orderedTasks.sort(Task::compareTo);
+		for (Task t : orderedTasks) {
+			printer.printRecord(t.getName());
+		}
+		printer.close(true);
+	}
+}

src/main/java/nl/andrewlalis/human_task_distributor/HumanTaskDistributor.java

@@ -1,14 +1,9 @@
 package nl.andrewlalis.human_task_distributor;
 
+import nl.andrewlalis.human_task_distributor.commands.DistributeTasks;
+import nl.andrewlalis.human_task_distributor.commands.PrepareTasksList;
 import org.apache.commons.cli.*;
 import org.apache.commons.csv.CSVFormat;
-import org.apache.commons.csv.CSVPrinter;
-
-import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import java.util.*;
-import java.util.stream.Collectors;
 
 public class HumanTaskDistributor {
 	public static final CSVFormat CSV_FORMAT = CSVFormat.RFC4180;
@@ -18,41 +13,14 @@ public class HumanTaskDistributor {
 		CommandLineParser cmdParser = new DefaultParser();
 		try {
 			CommandLine cmd = cmdParser.parse(options, args);
-			FileParser fileParser = new FileParser();
-			Map<Human, Float> nameWeightMap = fileParser.parseHumanList(cmd.getOptionValue("hl"));
-			Set<Task> tasks = fileParser.parseTaskList(cmd.getOptionValue("tl"));
-			String[] previousDistributionPaths = cmd.getOptionValues("prev");
-			if (previousDistributionPaths == null) previousDistributionPaths = new String[0];
-			List<Map<Human, Set<Task>>> previousDistributions = fileParser.parsePreviousTaskDistributions(previousDistributionPaths);
-
-			long start = System.currentTimeMillis();
-			Map<Human, Set<Task>> taskDistributions = new Distributor().generateDistribution(nameWeightMap, tasks, previousDistributions);
-			long durationMillis = System.currentTimeMillis() - start;
-			System.out.printf(
-					"Completed distribution of %d tasks to %d people in %d ms.%n",
-					tasks.size(),
-					taskDistributions.keySet().size(),
-					durationMillis
-			);
-
-			// Write to a file.
-			String filePath = cmd.hasOption("o") ? cmd.getOptionValue("o") : "distribution.csv";
-			CSVPrinter printer = new CSVPrinter(Files.newBufferedWriter(Paths.get(filePath), StandardCharsets.UTF_8), CSV_FORMAT);
-			for (Map.Entry<Human, Set<Task>> entry : taskDistributions.entrySet()) {
-				Human human = entry.getKey();
-				Set<Task> assignedTasks = entry.getValue();
-				List<Task> sortedTasks = assignedTasks.stream().sorted(Comparator.comparing(Task::getName)).collect(Collectors.toList());
-				for (Task task : sortedTasks) {
-					printer.printRecord(human.getName(), task.getName());
-				}
+			if (cmd.hasOption("ptl")) {
+				new PrepareTasksList().execute(cmd);
+			} else if (cmd.hasOption("hl") && cmd.hasOption("tl")) {
+				new DistributeTasks().execute(cmd);
 			}
-			printer.close(true);
-
-			System.out.println("Wrote task distribution data to " + filePath);
-
+			throw new IllegalArgumentException("Invalid command.");
 		} catch (Exception e) {
 			System.err.println("Error: " + e.getMessage());
-			e.printStackTrace();
 			HelpFormatter hf = new HelpFormatter();
 			hf.printHelp("HumanTaskDistributor", options);
 			System.exit(1);
@@ -65,16 +33,25 @@ public class HumanTaskDistributor {
 				.longOpt("humans-list")
 				.hasArg(true)
 				.desc("Path to a CSV file containing list of humans to distribute tasks to. First column should be the name of the person, and second column can be empty, or contain a floating-point weight.")
-				.required(true)
+				.required(false)
 				.numberOfArgs(1)
 				.type(String.class)
 				.build()
 		);
+		options.addOption(Option.builder("ptl")
+				.longOpt("prepare-tasks-list")
+				.desc("Prepares a tasks-list CSV from a TXT file with one task for each item that matches the given Regex.")
+				.required(false)
+				.numberOfArgs(2)
+				.valueSeparator(',')
+				.type(String.class)
+				.build()
+		);
 		options.addOption(Option.builder("tl")
 				.longOpt("tasks-list")
 				.hasArg(true)
 				.desc("Path to a CSV file containing list of tasks that can be distributed to humans. First column should be unique task name.")
-				.required(true)
+				.required(false)
 				.numberOfArgs(1)
 				.type(String.class)
 				.build()

src/main/java/nl/andrewlalis/human_task_distributor/Task.java

@@ -5,7 +5,7 @@ import lombok.Getter;
 import java.util.Objects;
 
 @Getter
-public class Task {
+public class Task implements Comparable<Task> {
 	private final String name;
 
 	public Task(String name) {
@@ -24,4 +24,9 @@ public class Task {
 	public int hashCode() {
 		return Objects.hash(getName());
 	}
+
+	@Override
+	public int compareTo(Task o) {
+		return this.getName().compareToIgnoreCase(o.getName());
+	}
 }

src/main/java/nl/andrewlalis/human_task_distributor/commands/Command.java

@@ -0,0 +1,8 @@
+package nl.andrewlalis.human_task_distributor.commands;
+
+import org.apache.commons.cli.CommandLine;
+
+public interface Command {
+
+	void execute(CommandLine cmd);
+}

src/main/java/nl/andrewlalis/human_task_distributor/commands/DistributeTasks.java

@@ -0,0 +1,41 @@
+package nl.andrewlalis.human_task_distributor.commands;
+
+import nl.andrewlalis.human_task_distributor.*;
+import org.apache.commons.cli.CommandLine;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class DistributeTasks implements Command {
+	@Override
+	public void execute(CommandLine cmd) {
+		final FileParser fileParser = new FileParser();
+		final FileWriter fileWriter = new FileWriter();
+		Map<Human, Float> nameWeightMap = fileParser.parseHumanList(cmd.getOptionValue("hl"));
+		Set<Task> tasks = fileParser.parseTaskList(cmd.getOptionValue("tl"));
+		String[] previousDistributionPaths = cmd.getOptionValues("prev");
+		if (previousDistributionPaths == null) previousDistributionPaths = new String[0];
+		List<Map<Human, Set<Task>>> previousDistributions = fileParser.parsePreviousTaskDistributions(previousDistributionPaths);
+
+		long start = System.currentTimeMillis();
+		Map<Human, Set<Task>> taskDistributions = new Distributor().generateDistribution(nameWeightMap, tasks, previousDistributions);
+		long durationMillis = System.currentTimeMillis() - start;
+		System.out.printf(
+				"Created distribution of %d tasks to %d people in %d ms.%n",
+				tasks.size(),
+				taskDistributions.keySet().size(),
+				durationMillis
+		);
+
+		// Write to a file.
+		final String filePath = cmd.hasOption("o") ? cmd.getOptionValue("o") : "distribution.csv";
+		try {
+			fileWriter.write(taskDistributions, filePath);
+			System.out.println("Wrote task distribution data to " + filePath);
+		} catch (IOException e) {
+			System.err.println("Couldn't write to file: " + e.getMessage());
+		}
+	}
+}

src/main/java/nl/andrewlalis/human_task_distributor/commands/PrepareTasksList.java

@@ -0,0 +1,31 @@
+package nl.andrewlalis.human_task_distributor.commands;
+
+import nl.andrewlalis.human_task_distributor.FileParser;
+import nl.andrewlalis.human_task_distributor.FileWriter;
+import nl.andrewlalis.human_task_distributor.Task;
+import org.apache.commons.cli.CommandLine;
+
+import java.io.IOException;
+import java.util.Set;
+
+public class PrepareTasksList implements Command {
+	@Override
+	public void execute(CommandLine cmd) {
+		String[] values = cmd.getOptionValues("ptl");
+		if (values.length != 2) {
+			throw new IllegalArgumentException("Expected exactly 2 parameters for ptl arg.");
+		}
+		String filePath = values[0].trim();
+		String regex = values[1].trim();
+		Set<Task> tasks = new FileParser().parseTaskList(filePath, regex);
+		System.out.println("Read " + tasks.size() + " tasks from file.");
+		String outFilePath = filePath.replaceFirst("\\..*", ".csv");
+		try {
+			new FileWriter().write(tasks, outFilePath);
+			System.out.println("Wrote tasks to " + outFilePath);
+		} catch (IOException e) {
+			e.printStackTrace();
+			System.err.println("Couldn't write output file.");
+		}
+	}
+}