feat: add PR support (#49)

* feat: add PR support

* add debug steps

* fix: use console

* fix: fix buil error

* [auto] build: update compiled version

* fix: better branch handling

* [auto] build: update compiled version

* chore: remove debug steps

* fix: fetch author using GitHub API when in PR

* [auto] build: update compiled version

* feat: extend API functionality to non-PR runs

* [auto] build: update compiled version

src/entrypoint.sh

@@ -52,15 +52,9 @@ if ! git diff --cached --quiet --exit-code; then
 
     git fetch
 
-    # Verify if the branch needs to be created
-    if ! git rev-parse --verify --quiet "$INPUT_REF"; then
-        echo "Creating branch..."
-        git branch "$INPUT_REF"
-    fi
-
-    # Switch to branch from current workflow run
-    echo "Switching branch..."
-    git checkout "$INPUT_REF"
+    # Switch branch (create a new one if it doesn't exist)
+    echo "Switching/creating branch..."
+    git checkout "$INPUT_REF" 2>/dev/null || git checkout -b "$INPUT_REF"
 
     echo "Pulling from remote..."
     git fetch && git pull

src/main.ts

@@ -1,36 +1,68 @@
 import { info, setFailed, getInput, warning } from '@actions/core'
 import { execFile } from 'child_process'
-import { join } from 'path'
+import path from 'path'
+import axios from 'axios'
 
-try {
-  checkInputs()
-  const child = execFile(join(__dirname, 'entrypoint.sh'), [], { shell: true })
+checkInputs().then(() => {
+  const child = execFile(path.join(__dirname, 'entrypoint.sh'), [], { shell: true })
   child.stdout?.pipe(process.stdout)
   child.stderr?.pipe(process.stderr)
-} catch (err) {
+}).catch(err => {
   console.error(err)
   setFailed(err instanceof Error ? err.message : err)
-}
+})
 
-function checkInputs() {
-  const eventPath = process.env.GITHUB_EVENT_PATH
-  const author = eventPath && require(eventPath)?.head_commit?.author
+async function checkInputs() {
+  const eventPath = process.env.GITHUB_EVENT_PATH,
+    event = eventPath && require(eventPath),
+    isPR = process.env.GITHUB_EVENT_NAME?.includes('pull_request'),
+    sha = (event?.pull_request?.head?.sha || process.env.GITHUB_SHA) as string,
+    defaultRef = isPR
+      ? event?.pull_request?.head?.ref as string
+      : process.env.GITHUB_REF?.substring(11)
+
+  const actualRef = setDefault('ref', defaultRef || '')
+
+  let author = event?.head_commit?.author
+  if (sha && !author) {
+    info('Unable to get commit from workflow event: trying with the GitHub API...')
+
+    // https://docs.github.com/en/rest/reference/repos#get-a-commit--code-samples
+    const url = `https://api.github.com/repos/${process.env.GITHUB_REPOSITORY}/commits/${sha}`,
+      headers = process.env.GITHUB_TOKEN ? {
+        Authorization: `Bearer ${process.env.GITHUB_TOKEN}`
+      } : undefined,
+      commit = (await axios.get(url, { headers })).data
+
+    author = commit?.commit?.author
+  }
 
   if (author) {
     setDefault('author_name', author.name)
     setDefault('author_email', author.email)
-  } else {
-    if (!getInput('author_name') || !getInput('author_email')) warning(`Unable to fetch author info: couldn't find ${!eventPath ? 'event path' : !require(eventPath)?.head_commit ? 'commit' : 'commit author'}.`)
+  }
+
+  if (!getInput('author_name') || !getInput('author_email')) {
+    const reason = !eventPath
+      ? 'event path'
+      : isPR
+        ? sha
+          ? 'fetch commit'
+          : 'find commit sha'
+        : !event?.head_commit
+          ? 'find commit'
+          : 'find commit author'
+    warning(`Unable to fetch author info: couldn't ${reason}.`)
     setDefault('author_name', 'Add & Commit Action')
     setDefault('author_email', 'actions@github.com')
   }
 
-  setDefault('ref', process.env.GITHUB_REF?.substring(11) || '')
-
   info(`Using '${getInput('author_name')} <${getInput('author_email')}>' as author.`)
+  if (isPR) info(`Running for a PR, the action will use '${actualRef}' as ref.`)
 }
 
 function setDefault(input: string, value: string) {
   const key = 'INPUT_' + input.toUpperCase()
   if (!process.env[key]) process.env[key] = value
+  return process.env[key] as string
 }