Merge pull request #113 from sankichi92/handle-no-base-commit

Handle cases with no base commit

.github/workflows/ci.yml

@@ -2,9 +2,7 @@ name: CI
 
 on:
   pull_request:
-    branches: ["main"]
   push:
-    branches: ["main"]
 
 jobs:
   lint:

src/github.ts

@@ -9,6 +9,12 @@ export function getBaseSHA(context: Context) {
     }
     case "push": {
       const payload = context.payload as PushEvent;
+
+      // https://github.com/sankichi92/list-changed-directories/issues/107
+      if (payload.created) {
+        return null;
+      }
+
       return payload.before;
     }
     default: {

src/main.ts

@@ -25,6 +25,14 @@ export async function run() {
 
     core.startGroup("Fetching the base commit");
     const baseSHA = getBaseSHA(github.context);
+    if (baseSHA === null) {
+      core.endGroup();
+      core.info(
+        `No base commit found since "${github.context.ref}" was created by this push.`,
+      );
+      core.setOutput("changed-directories", candidateDirs);
+      return;
+    }
     await gitFetch(baseSHA);
     core.endGroup();