Add GitHubIntegration.java for GitHub API integration.

modules/org.pathvisio.gui/src/org/pathvisio/gui/GitHubIntegration.java

@@ -0,0 +1,39 @@
+package org.pathvisio.gui;
+
+import org.kohsuke.github.*;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class GitHubIntegration {
+    private GitHub github;
+
+    public GitHubIntegration(String token) throws Exception {
+        github = GitHub.connectUsingOAuth(token);
+    }
+
+    public GitHubIntegration() throws Exception {
+        // Load token from a properties file
+        String token = loadTokenFromProperties();
+        if (token == null || token.isEmpty()) {
+            throw new IllegalStateException("GitHub token not found in config.properties");
+        }
+        github = GitHub.connectUsingOAuth(token);
+    }
+
+    private String loadTokenFromProperties() {
+        Properties properties = new Properties();
+        try (FileInputStream fis = new FileInputStream("config.properties")) {
+            properties.load(fis);
+            return properties.getProperty("github.token");
+        } catch (IOException e) {
+            System.err.println("Failed to load GitHub token from config.properties: " + e.getMessage());
+            return null;
+        }
+    }
+
+    public void saveToGitHub(String repoName, String filePath, String content, String commitMessage) throws Exception {
+        GHRepository repo = github.getRepository(repoName);
+        repo.createContent(content, commitMessage, filePath);
+    }
+}