build version info for nshm

src/main/java/gov/usgs/earthquake/nshmp/www/HazVersion.java

 package gov.usgs.earthquake.nshmp.www;
 
+import java.nio.file.Path;
+import java.util.ArrayList;
+
+import org.eclipse.jgit.api.Git;
+
 import com.google.common.io.Resources;
 
 import gov.usgs.earthquake.nshmp.internal.AppVersion;
@@ -7,17 +12,61 @@ import gov.usgs.earthquake.nshmp.internal.LibVersion;
 
 public class HazVersion implements AppVersion {
 
-  public static VersionInfo[] appVersions() {
-    VersionInfo[] versions = {
-        new HazVersion().getVersionInfo(),
-        new LibVersion().getVersionInfo(),
-        new WsUtilsVersion().getVersionInfo(),
-    };
-    return versions;
+  public static VersionInfo[] appVersions(Path modelPath) {
+    var versions = new ArrayList<VersionInfo>();
+    versions.add(new HazVersion().getVersionInfo());
+    versions.add(new LibVersion().getVersionInfo());
+    versions.add(new WsUtilsVersion().getVersionInfo());
+
+    var nshmVersion = getNshmVersion(modelPath);
+
+    if (nshmVersion != null) {
+      versions.add(nshmVersion);
+    }
+
+    return versions.toArray(new VersionInfo[0]);
   }
 
+  /**
+   * Returns the version info from resources file.
+   */
   public VersionInfo getVersionInfo() {
     var resource = Resources.getResource("version/nshmp-haz-version.json");
     return AppVersion.versionInfo(resource);
   }
+
+  /**
+   * Returns the version info of a repository.
+   *
+   * If the model path is not a git repository, returns null.
+   *
+   * @param modelPath The path to the model
+   */
+  private static VersionInfo getNshmVersion(Path modelPath) {
+    try {
+      var git = Git.open(modelPath.toFile());
+      var repo = git.getRepository();
+      var hash = repo.getRefDatabase().findRef("HEAD").getObjectId().name();
+      var url = repo
+          .getConfig()
+          .getString("remote", "origin", "url")
+          .split(".git")[0];
+      var slash = url.split("/");
+      var projectName = slash[slash.length - 1];
+
+      return VersionInfo.builder()
+          .projectName(projectName)
+          .url(repo.getConfig().getString("remote", "origin", "url"))
+          .version(git.describe().call())
+          .branchName(repo.getBranch())
+          .commitDistance(0)
+          .gitHash(hash.substring(0, 10))
+          .gitHashFull(hash)
+          .isCleanTag(git.status().call().isClean())
+          .lastTag("")
+          .build();
+    } catch (Exception e) {
+      return null;
+    }
+  }
 }