744: The "Webrevs" link in the PR has confusing link to the changes f…

…or just one commit

Reviewed-by: rwestberg

bots/mlbridge/src/main/java/org/openjdk/skara/bots/mlbridge/ArchiveWorkItem.java

@@ -155,7 +155,7 @@ private void updateWebrevComment(List<Comment> comments, int index, List<WebrevD
         comment += "### Webrevs" + "\n";
         comment += webrevListMarker + "\n";
         comment += " * " + String.format("%02d", index) + ": " + webrevDescriptions;
-        comment += " (" + pr.headHash() + ")\n";
+        comment += " (" + pr.filesUrl(pr.headHash()) + ")\n";
 
         if (existing.isPresent()) {
             if (existing.get().body().contains(webrevDescriptions)) {

bots/tester/src/test/java/org/openjdk/skara/bots/tester/InMemoryPullRequest.java

@@ -314,4 +314,9 @@ public Diff diff() {
     public Optional<HostUser> closedBy() {
         return Optional.empty();
     }
+
+    @Override
+    public URI filesUrl(Hash hash) {
+        return null;
+    }
 }

forge/src/main/java/org/openjdk/skara/forge/PullRequest.java

@@ -161,4 +161,6 @@ public interface PullRequest extends Issue {
      * @return
      */
     void setTargetRef(String targetRef);
+
+    URI filesUrl(Hash hash);
 }

forge/src/main/java/org/openjdk/skara/forge/github/GitHubPullRequest.java

@@ -738,4 +738,10 @@ public Optional<HostUser> closedBy() {
                       .reduce((a, b) -> b)
                       .map(e -> host.parseUserObject(e.get("actor")));
     }
+
+    @Override
+    public URI filesUrl(Hash hash) {
+        var endpoint = "/" + repository.name() + "/pull/" + id() + "/files/" + hash.hex();
+        return host.getWebURI(endpoint);
+    }
 }

forge/src/main/java/org/openjdk/skara/forge/gitlab/GitLabMergeRequest.java

@@ -788,4 +788,10 @@ public Optional<HostUser> closedBy() {
 
         return Optional.of(host.parseAuthorObject(json.get("closed_by").asObject()));
     }
+
+    @Override
+    public URI filesUrl(Hash hash) {
+        var endpoint = "/" + repository.name() + "/-/merge_requests/" + id() + "/diffs?commit_id=" + hash.hex();
+        return host.getWebUri(endpoint);
+    }
 }

test/src/main/java/org/openjdk/skara/test/TestPullRequest.java

@@ -257,4 +257,9 @@ public Diff diff() {
             throw new UncheckedIOException(e);
         }
     }
+
+    @Override
+    public URI filesUrl(Hash hash) {
+        return URI.create(webUrl().toString() + "/files/" + hash.hex());
+    }
 }