feat: make merge_method configurable

action.yml

@@ -8,6 +8,10 @@ inputs:
     description: "Packages that you want to manually review before upgrading"
     required: false
     default: []
+  merge-method:
+    description: "The merge method you would like to use (squash, merge, rebase)"
+    required: false
+    default: "squash"
 runs:
   using: "node12"
-  main: "index.js"
+  main: "src/index.js"

package.json

@@ -2,7 +2,7 @@
   "name": "github-action-merge-dependabot",
   "version": "1.0.1",
   "description": "",
-  "main": "index.js",
+  "main": "src/index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

index.js → src/index.js

@@ -1,14 +1,9 @@
 const core = require('@actions/core')
 const github = require('@actions/github')
 
-const GITHUB_TOKEN = core.getInput('github-token', { required: true })
-const EXCLUDE_PKGS = core.getInput('exclude') || []
+const { getInputs } = require('./util')
 
-const getMergeMethod = (repo) => {
-  if (repo.allow_merge_commit) return 'merge'
-  if (repo.allow_squash_merge) return 'squash'
-  return 'rebase'
-}
+const { GITHUB_TOKEN, MERGE_METHOD, EXCLUDE_PKGS } = getInputs()
 
 async function run () {
   try {
@@ -43,7 +38,7 @@ async function run () {
       owner,
       repo,
       pull_number: prNumber,
-      merge_method: getMergeMethod(pr.head.repo)
+      merge_method: MERGE_METHOD
     })
   } catch (error) {
     core.setFailed(error.message)

src/log.js

@@ -0,0 +1,12 @@
+const { debug, error, info, warning } = require('@actions/core')
+
+const stringify = (msg) => (
+  typeof msg === 'string' ? msg : (msg.stack || msg.toString())
+)
+
+const log = logger => message => logger(stringify(message))
+
+exports.logDebug = log(debug)
+exports.logError = log(error)
+exports.logInfo = log(info)
+exports.logWarning = log(warning)

src/util.js

@@ -0,0 +1,26 @@
+const core = require('@actions/core')
+
+const { logWarning } = require('./log')
+
+const mergeMethods = {
+  merge: 'merge',
+  squash: 'squash',
+  rebase: 'rebase'
+}
+
+const getMergeMethod = () => {
+  const input = core.getInput('merge-method')
+
+  if (!input || !mergeMethods[input]) {
+    logWarning('merge-method input is ignored because it is malformed, defaulting to `squash`.')
+    return mergeMethods.squash
+  }
+
+  return mergeMethods[input]
+}
+
+exports.getInputs = () => ({
+  GITHUB_TOKEN: core.getInput('github-token', { required: true }),
+  MERGE_METHOD: getMergeMethod(),
+  EXCLUDE_PKGS: core.getInput('exclude') || []
+})