feat: support multilines commit message

* will now allow user to have a commit description

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 coverage
-build
+build
+.idea

src/client/conventional_commit.ts

@@ -49,10 +49,12 @@ export class ConventionalCommit {
       return { error: "commit message is empty" };
     }
 
+    const cleanedMessage = this.cleanMessage(message);
+
     // validate the commit message
-    if (!this.validateMessage(message)) {
+    if (!this.validateMessage(cleanedMessage)) {
       return {
-        error: `commit message [${message}] does not follow the conventional commit format`,
+        error: `commit message [${cleanedMessage}] does not follow the conventional commit format`,
       };
     }
 
@@ -107,6 +109,10 @@ export class ConventionalCommit {
     return diffLabels;
   }
 
+  cleanMessage(message: string) {
+    return message.split("\n")[0];
+  }
+
   /**
    * Validate commit messages based on the conventional commit format.
    * The following rules will be applied:
@@ -127,8 +133,10 @@ export class ConventionalCommit {
     }
 
     // if there is only one message, check if it is equal to the title of the PR
-    if (messages.length === 1 && messages[0] !== title) {
-      return `commit message [${messages[0]}] does not equal to the title of the PR [${title}]`;
+    if (messages.length === 1 && this.cleanMessage(messages[0]) !== title) {
+      return `commit message [${this.cleanMessage(
+        messages[0]
+      )}] does not equal to the title of the PR [${title}]`;
     }
 
     // check if the commit messages are valid

src/tests/covnentioanl_commit.test.ts

@@ -142,4 +142,9 @@ describe("Given a conventional commit client", () => {
       "commit message [fi: hello] does not follow the conventional commit format"
     );
   });
+
+  it("Should return no error", () => {
+    const error = client.validate(["fix: hello\n* a: fix error"], "fix: hello");
+    expect(error).toBeUndefined();
+  });
 });