fix in case project doesn't start at repo root.

I came up with the following fix for some of our legacy projects and
https://issues.jenkins-ci.org/browse/JENKINS-24373

Maybe there is a more elegant solution (e.g. getting the „offset“ from
the SCM), but as I’m new to jenkins plugin dev I would need some
pointers.

src/main/java/hudson/plugins/redmine/RedmineRepositoryBrowser.java

@@ -23,18 +23,23 @@
  */
 public class RedmineRepositoryBrowser extends SubversionRepositoryBrowser {
 	private final String repositoryId; 
-
+	private final String repositoryOffset;
 	@DataBoundConstructor
-	public RedmineRepositoryBrowser(String repositoryId) {
+	public RedmineRepositoryBrowser(String repositoryId, String repositoryOffset) {
 		this.repositoryId = repositoryId;
+		this.repositoryOffset = repositoryOffset;
 	}
 
 	/**
-	 * @deprecated use {@link #RedmineRepositoryBrowser(String)}
+	 * @deprecated use {@link #RedmineRepositoryBrowser(String,String)}
 	 */
 	@Deprecated
 	public RedmineRepositoryBrowser() {
-		this(null);
+		this(null,null);
+	}
+
+	public String getRepositoryOffset() {
+		return repositoryOffset;
 	}
 
 	public String getRepositoryId() {
@@ -149,11 +154,19 @@ private String getRepositoryId(LogEntry logEntry) {
 			return "/" + this.repositoryId.trim();
 		}
 	}
+
+	private String getRepositoryOffset(LogEntry logEntry) {
+		if (this.repositoryOffset == null || this.repositoryOffset.trim().length() == 0){
+			return "";
+		} else {
+			return this.repositoryOffset.trim();
+		}
+	}
 
 	private String getFilePath(LogEntry logEntry, String fileFullPath) {
 		AbstractProject<?,?> p = (AbstractProject<?,?>)logEntry.getParent().build.getProject();
 		RedmineProjectProperty rpp = p.getProperty(RedmineProjectProperty.class);
-
+		String rOffset=getRepositoryOffset(logEntry);
 		String filePath = "";
 		if(VersionUtil.isVersionBefore081(rpp.getRedmineWebsite().versionNumber)) {
 			String[] filePaths = fileFullPath.split("/");
@@ -169,6 +182,12 @@ private String getFilePath(LogEntry logEntry, String fileFullPath) {
 		} else { 
 			filePath = fileFullPath;
 		}
+
+		if (rOffset.length()>0){
+			if(filePath.startsWith(rOffset)){
+				filePath="/"+filePath.substring(rOffset.length());
+			}
+		}
 		return filePath;
 
 	}

src/main/resources/hudson/plugins/redmine/RedmineRepositoryBrowser/config.jelly

@@ -2,4 +2,7 @@
   <f:entry field="repositoryId" title="${%Redmine repository identifier}" help="/plugin/redmine/help-repo.html">
     <f:textbox />
   </f:entry>
+   <f:entry field="repositoryOffset" title="${%Redmine repository offset}" help="/plugin/redmine/help-repo-offset.html">
+    <f:textbox />
+  </f:entry>
 </j:jelly>

src/main/resources/hudson/plugins/redmine/RedmineRepositoryBrowser/config.properties

@@ -1 +1,2 @@
 Redmine\ repository\ identifier=Redmine repository identifier
+Redmine\ repository\ offset=Redmine repository offset

src/main/webapp/help-repo-offset.html

@@ -0,0 +1,3 @@
+<div>
+  If the Redmine repository is not the project's root, specify the offset here.
+</div>