Add findActionFileName utility and corresponding tests

src/lib/create-commit.ts

@@ -1,5 +1,6 @@
 import { Toolkit } from 'actions-toolkit'
 import readFile from './read-file'
+import findActionFileName from './find-action-file-name'
 
 export default async function createCommit(tools: Toolkit) {
   const { main } = tools.getPackageJSON<{ main?: string }>()
@@ -8,15 +9,17 @@ export default async function createCommit(tools: Toolkit) {
     throw new Error('Property "main" does not exist in your `package.json`.')
   }
 
+  const actionFileName = findActionFileName(tools.workspace)
+
   tools.log.info('Creating tree')
   const tree = await tools.github.git.createTree({
     ...tools.context.repo,
     tree: [
       {
-        path: 'action.yml',
+        path: actionFileName,
         mode: '100644',
         type: 'blob',
-        content: await readFile(tools.workspace, 'action.yml')
+        content: await readFile(tools.workspace, actionFileName)
       },
       {
         path: main,

src/lib/find-action-file-name.ts

@@ -0,0 +1,18 @@
+import fs from 'fs'
+import path from 'path'
+
+export default function findActionFileName(baseDir: string): string {
+    const actionYmlPath = path.join(baseDir, 'action.yml')
+
+    if (fs.existsSync(actionYmlPath)) {
+        return 'action.yml'
+    }
+
+    const actionYamlPath = path.join(baseDir, 'action.yaml')
+
+    if (fs.existsSync(actionYamlPath)) {
+        return 'action.yaml'
+    }
+
+    throw new Error('No action file found. Please create an action.yml or action.yaml file.')
+}

tests/find-action-file-name.test.ts

@@ -0,0 +1,21 @@
+import path from 'path'
+import findActionFileName from '../src/lib/find-action-file-name'
+
+describe('read-file', () => {
+
+  it('finds the action file name in the workspace', () => {
+    const result = findActionFileName(path.join(__dirname, 'fixtures', 'workspace'))
+    expect(result).toBe('action.yml')
+  })
+
+  it('finds the action file name in the workspace with action.yaml', () => {
+    const result = findActionFileName(path.join(__dirname, 'fixtures', 'workspace-action-yaml'))
+    expect(result).toBe('action.yaml')
+  })
+
+  it('throws an error when no action file is found', () => {
+    expect(() => findActionFileName(path.join(__dirname, 'fixtures'))).toThrowError(
+        new Error('No action file found. Please create an action.yml or action.yaml file.')
+    )
+  })
+})

tests/fixtures/workspace-action-yaml/action.yaml

@@ -0,0 +1,12 @@
+name: Build and Tag
+description: Properly tags your GitHub Action
+runs:
+  using: node12
+  main: dist/index.js
+branding:
+  icon: archive
+  color: blue
+inputs:
+  setup:
+    default: 'npm ci && npm run build --if-present'
+    description: A command that runs before publishing the action to the release's tag.