src/main/java/nl/andrewlalis/Main.java

@@ -42,6 +42,7 @@ public class Main {
         executor.registerCommand("generate_assignments", new GenerateAssignmentsRepo());
         executor.registerCommand("define_ta_teams", new DefineTaTeams(app));
         executor.registerCommand("list_errors", new ListErrors());
+        executor.registerCommand("delete_repos", new DeleteRepos());
 
         logger.info("GithubManager for Github Repositories in Educational Organizations.\n" +
                 "© Andrew Lalis (2018), All rights reserved.\n" +

src/main/java/nl/andrewlalis/git_api/GithubManager.java

@@ -168,6 +168,7 @@ public class GithubManager {
             if (repo.getName().contains(substring)) {
                 try {
                     repo.delete();
+                    logger.info("Deleted repository: " + repo.getName());
                 } catch (IOException e) {
                     InitializerApp.organization.addError(new Error(Severity.HIGH, "Could not delete repository: " + repo.getName()));
                     e.printStackTrace();

src/main/java/nl/andrewlalis/ui/control/command/executables/DeleteRepos.java

@@ -0,0 +1,17 @@
+package nl.andrewlalis.ui.control.command.executables;
+
+import nl.andrewlalis.git_api.GithubManager;
+
+/**
+ * Deletes all repositories with a given substring.
+ */
+public class DeleteRepos extends GithubExecutable {
+    @Override
+    protected boolean executeWithManager(GithubManager manager, String[] args) {
+        if (args.length < 1) {
+            return false;
+        }
+        manager.deleteAllRepositories(args[0]);
+        return true;
+    }
+}

src/main/java/nl/andrewlalis/ui/control/command/executables/ListErrors.java

@@ -22,6 +22,9 @@ public class ListErrors implements Executable {
     @Override
     public boolean execute(String[] args) {
         StringBuilder sb = new StringBuilder("Runtime Errors:\n");
+        if (InitializerApp.organization.getErrors().isEmpty()) {
+            sb.append("None");
+        }
         for (Error error : InitializerApp.organization.getErrors()) {
             sb.append(error);
         }

src/main/java/nl/andrewlalis/ui/control/listeners/DeleteReposListener.java

@@ -0,0 +1,32 @@
+package nl.andrewlalis.ui.control.listeners;
+
+import nl.andrewlalis.ui.control.command.CommandExecutor;
+import nl.andrewlalis.ui.view.InitializerApp;
+
+import javax.swing.*;
+import java.awt.event.ActionEvent;
+
+/**
+ * A listener for when the user wants to delete repositories.
+ */
+public class DeleteReposListener extends ExecutableListener {
+
+    public DeleteReposListener(CommandExecutor executor, InitializerApp app) {
+        super(executor, app);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent actionEvent) {
+        String input = JOptionPane.showInputDialog(this.app, "Please enter a string which, if a repository contains it, results in deleting the repository.", "Enter Substing", JOptionPane.QUESTION_MESSAGE);
+        if (input != null) {
+            int decision = JOptionPane.showConfirmDialog(null, "Are you sure you want to delete all repositories that contain \"" + "\" in their name?", "Delete Repositories", JOptionPane.YES_NO_OPTION);
+            if (decision == JOptionPane.YES_OPTION) {
+                this.executor.executeCommand("delete_repos", new String[]{
+                        app.getOrganizationName(),
+                        app.getAccessToken(),
+                        input
+                });
+            }
+        }
+    }
+}

src/main/java/nl/andrewlalis/ui/view/InitializerApp.java

@@ -7,6 +7,7 @@ import nl.andrewlalis.ui.control.listeners.*;
 
 import javax.swing.*;
 import java.awt.*;
+import java.awt.event.ActionListener;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -118,23 +119,22 @@ public class InitializerApp extends JFrame {
         JPanel commonActionsPanel = new JPanel();
         commonActionsPanel.setLayout(new BoxLayout(commonActionsPanel, BoxLayout.PAGE_AXIS));
 
-        JButton archiveAllButton = new JButton("Archive All");
-        archiveAllButton.addActionListener(new ArchiveAllListener(this.executor, this));
-        commonActionsPanel.add(archiveAllButton);
+        commonActionsPanel.add(this.generateButtonPanel("Archive All", new ArchiveAllListener(this.executor, this)));
+        commonActionsPanel.add(this.generateButtonPanel("Read Students File", new ReadStudentsFileListener(this.executor, this)));
+        commonActionsPanel.add(this.generateButtonPanel("Generate Assignments Repo", new GenerateAssignmentsRepoListener(this.executor, this)));
 
-        JButton generateStudentTeamsButton = new JButton("Read teams from file");
-        generateStudentTeamsButton.addActionListener(new ReadStudentsFileListener(this.executor, this));
-        commonActionsPanel.add(generateStudentTeamsButton);
+        // TODO: Enable this once the define teams dialog is complete.
+//        JButton defineTaTeamsButton = new JButton("Define TA Teams");
+//        defineTaTeamsButton.addActionListener(new DefineTaTeamsListener(this.executor, this));
+//        commonActionsPanel.add(f);
 
-        JButton generateAssignmentsRepoButton = new JButton("Generate Assignments Repo");
-        generateAssignmentsRepoButton.addActionListener(new GenerateAssignmentsRepoListener(this.executor, this));
-        commonActionsPanel.add(generateAssignmentsRepoButton);
+        commonActionsPanel.add(this.generateButtonPanel("Delete Repos", new DeleteReposListener(this.executor, this)));
 
-        JButton defineTaTeamsButton = new JButton("Define TA Teams");
-        defineTaTeamsButton.addActionListener(new DefineTaTeamsListener(this.executor, this));
-        commonActionsPanel.add(defineTaTeamsButton);
+        // Extra panel to push buttons to the top.
+        JPanel buttonAlignmentPanel = new JPanel(new BorderLayout());
+        buttonAlignmentPanel.add(commonActionsPanel, BorderLayout.NORTH);
 
-        githubManagerPanel.add(commonActionsPanel, BorderLayout.CENTER);
+        githubManagerPanel.add(buttonAlignmentPanel, BorderLayout.CENTER);
 
         return githubManagerPanel;
     }
@@ -190,6 +190,20 @@ public class InitializerApp extends JFrame {
         return newPanel;
     }
 
+    /**
+     * Generates a button with an attached action listener.
+     * @param buttonText The text to display on the button.
+     * @param listener The listener to attach to the button.
+     * @return A BorderLayout JPanel which contains the button in the CENTER location.
+     */
+    private JPanel generateButtonPanel(String buttonText, ActionListener listener) {
+        JPanel panel = new JPanel(new BorderLayout());
+        JButton button = new JButton(buttonText);
+        button.addActionListener(listener);
+        panel.add(button, BorderLayout.CENTER);
+        return panel;
+    }
+
     /**
      * Gets the organization name entered in the relevant field.
      * @return The organization name the user has entered.