Add a way to filter PR based on source branch

README.md

@@ -52,6 +52,7 @@ Select *Stash Pull Request Builder* then configure:
 **Advanced options**
 - Ignore ssl certificates:
 - Build PR targetting only these branches: common separated list of branch names (or regexes). Blank for all.
+- Build PR from these branches only: common separated list of branch names (or regexes). Blank for all.
 - Rebuild if destination branch changes:
 - Build only if Stash reports no conflicts: this should be set if using the merge branch to avoid issues with out of data merge branch in stash
 - Build only if PR is mergeable (note this will stop the PR being built if you have required approvers limit set >0 and the PR hasn't been approved)

src/main/java/stashpullrequestbuilder/stashpullrequestbuilder/StashBuildTrigger.java

@@ -61,6 +61,7 @@ public class StashBuildTrigger extends Trigger<Job<?, ?>> {
     private final String ciSkipPhrases;
     private final String ciBuildPhrases;
     private final String targetBranchesToBuild;
+    private final String sourceBranchesToBuild;
     private final boolean ignoreSsl;
     private final boolean checkDestinationCommit;
     private final boolean checkMergeable;
@@ -93,6 +94,7 @@ public StashBuildTrigger(
             String ciBuildPhrases,
             boolean deletePreviousBuildFinishComments,
             String targetBranchesToBuild,
+            String sourceBranchesToBuild,
             boolean cancelOutdatedJobsEnabled
     ) throws ANTLRException {
         super(cron);
@@ -113,6 +115,7 @@ public StashBuildTrigger(
         this.onlyBuildOnComment = onlyBuildOnComment;
         this.deletePreviousBuildFinishComments = deletePreviousBuildFinishComments;
         this.targetBranchesToBuild = targetBranchesToBuild;
+        this.sourceBranchesToBuild = sourceBranchesToBuild;
     }
 
     public String getStashHost() {
@@ -187,6 +190,10 @@ public String getTargetBranchesToBuild() {
         return targetBranchesToBuild;
     }
 
+    public String getSourceBranchesToBuild() {
+        return sourceBranchesToBuild;
+    }
+
     public boolean getMergeOnSuccess() {
         return mergeOnSuccess;
     }

src/main/java/stashpullrequestbuilder/stashpullrequestbuilder/StashRepository.java

@@ -260,6 +260,11 @@ private boolean isBuildTarget(StashPullRequestResponseValue pullRequest) {
                 return false;
             }
 
+            if (!isFromSourceBranch(pullRequest)) {
+                logger.info("Skipping PR: " + pullRequest.getId() + " as sourcing from branch: " + pullRequest.getFromRef().getBranch().getName());
+                return false;
+            }
+
             if(!isPullRequestMergable(pullRequest)) {
                 logger.info("Skipping PR: " + pullRequest.getId() + " as cannot be merged");
                 return false;
@@ -359,6 +364,20 @@ private boolean isForTargetBranch(StashPullRequestResponseValue pullRequest) {
         return true;
     }
 
+    private boolean isFromSourceBranch(StashPullRequestResponseValue pullRequest) {
+        String sourceBranchesToBuild = this.trigger.getSourceBranchesToBuild();
+        if (sourceBranchesToBuild !=null && !"".equals(sourceBranchesToBuild)) {
+            String[] branches = sourceBranchesToBuild.split(",");
+            for(String branch : branches) {
+                if (pullRequest.getFromRef().getBranch().getName().matches(branch.trim())) {
+                    return true;
+                }
+            }
+            return false;
+        }
+        return true;
+    }
+
     private boolean isSkipBuild(String pullRequestContentString) {
         String skipPhrases = this.trigger.getCiSkipPhrases();
         if (skipPhrases != null && !"".equals(skipPhrases)) {

src/main/resources/stashpullrequestbuilder/stashpullrequestbuilder/StashBuildTrigger/config.jelly

@@ -22,6 +22,9 @@
     <f:entry title="Build PR targetting only these branches" field="targetBranchesToBuild">
       <f:textbox default="" />
     </f:entry>
+    <f:entry title="Build PR from these branches only" field="sourceBranchesToBuild">
+      <f:textbox default="" />
+    </f:entry>
     <f:entry title="Rebuild if destination branch changes" field="checkDestinationCommit">
       <f:checkbox />
     </f:entry>