fix: errors not showing when PR has only one commit

.github/workflows/commitlint.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - uses: actions/checkout@v1
       - run: sed -i -E "s/([']docker:.+)/Dockerfile/" ./action.yml
-      - run: echo -n "" > .dockerignore
+      - run: echo -n '' > .dockerignore
       - uses: ./
   commitlint-with-yml-file:
     runs-on: ubuntu-latest

run.js

@@ -18,8 +18,12 @@ const configPath = resolve(
 
 const { context: eventContext } = github
 
+const pushEventHasOnlyOneCommit = from => {
   const gitEmptySha = '0000000000000000000000000000000000000000'
 
+  return from === gitEmptySha
+}
+
 const getRangeForPushEvent = () => {
   let from = eventContext.payload.before
   const to = GITHUB_SHA
@@ -32,7 +36,7 @@ const getRangeForPushEvent = () => {
     from = null
   }
 
-  if (from === gitEmptySha) {
+  if (pushEventHasOnlyOneCommit(from)) {
     from = null
   }
 
@@ -58,7 +62,7 @@ const getRangeForEvent = async () => {
 
 function getHistoryCommits(from, to) {
   const options = {
-    from,
+    from: from && `${from}^1`,
     to,
   }