gitgraph #2934 support tags for merge commits

src/diagrams/git/gitGraphAst.js

@@ -136,7 +136,7 @@ export const branch = function (name) {
   }
 };
 
-export const merge = function (otherBranch) {
+export const merge = function (otherBranch, tag) {
   otherBranch = common.sanitizeText(otherBranch, configApi.getConfig());
   const currentCommit = commits[branches[curBranch]];
   const otherCommit = commits[branches[otherBranch]];
@@ -213,6 +213,7 @@ export const merge = function (otherBranch) {
     parents: [head == null ? null : head.id, branches[otherBranch]],
     branch: curBranch,
     type: commitType.MERGE,
+    tag: tag ? tag : '',
   };
   head = commit;
   commits[commit.id] = commit;

src/diagrams/git/gitGraphParserV2.spec.js

@@ -411,6 +411,41 @@ describe('when parsing a gitGraph', function () {
     ]);
   });
 
+  it('should handle merge tags', function () {
+    const str = `gitGraph:
+    commit
+    branch testBranch
+    checkout testBranch
+    commit
+    checkout main
+    merge testBranch tag: "merge-tag"
+    `;
+
+    parser.parse(str);
+    const commits = parser.yy.getCommits();
+    expect(Object.keys(commits).length).toBe(3);
+    expect(parser.yy.getCurrentBranch()).toBe('main');
+    expect(parser.yy.getDirection()).toBe('LR');
+    expect(Object.keys(parser.yy.getBranches()).length).toBe(2);
+    const commit1 = Object.keys(commits)[0];
+    const commit2 = Object.keys(commits)[1];
+    const commit3 = Object.keys(commits)[2];
+
+    expect(commits[commit1].branch).toBe('main');
+    expect(commits[commit1].parents).toStrictEqual([]);
+
+    expect(commits[commit2].branch).toBe('testBranch');
+    expect(commits[commit2].parents).toStrictEqual([commits[commit1].id]);
+
+    expect(commits[commit3].branch).toBe('main');
+    expect(commits[commit3].parents).toStrictEqual([commits[commit1].id, commits[commit2].id]);
+    expect(commits[commit3].tag).toBe('merge-tag');
+    expect(parser.yy.getBranchesAsObjArray()).toStrictEqual([
+      { name: 'main' },
+      { name: 'testBranch' },
+    ]);
+  });
+
   it('should throw error when try to branch existing branch: main', function () {
     const str = `gitGraph
     commit

src/diagrams/git/parser/gitGraph.jison

@@ -89,11 +89,17 @@ line
 
 statement
     : commitStatement
+    | mergeStatement
     | BRANCH ID {yy.branch($2)}
     | CHECKOUT ID {yy.checkout($2)}
-    | MERGE ID {yy.merge($2)}
     // | RESET reset_arg {yy.reset($2)}
     ;
+
+mergeStatement
+    : MERGE ID {yy.merge($2)}
+    | MERGE ID COMMIT_TAG STR {yy.merge($2, $4)}
+    ;
+
 commitStatement
     : COMMIT commit_arg {yy.commit($2)}
     | COMMIT COMMIT_TAG STR {yy.commit('','',yy.commitType.NORMAL,$3)}