Fix/fallback to title parsing (#182)

* fix: fallback to PR title parsing for non package.json modules

* test: remove .only from tests

* test: add more PR title parsing test cases

dist/index.js

@@ -9338,7 +9338,9 @@ module.exports = async function run() {
     }
 
     const prDiff = await client.getPullRequestDiff(pr.number)
-    const moduleChanges = getModuleVersionChanges(prDiff)
+
+    // Get changed modules from diff if available or from PR title as fallback
+    const moduleChanges = getModuleVersionChanges(prDiff) || parsePrTitle(pr)
 
     if (TARGET !== targetOptions.any) {
       logInfo(`Checking if the changes in the PR can be merged`)
@@ -9389,6 +9391,19 @@ function isAMajorReleaseBump(change) {
   return diff === targetOptions.major
 }
 
+function parsePrTitle(pullRequest) {
+  const expression = /bump (\S+) from (\S+) to (\S+)/i
+  const match = expression.exec(pullRequest.title)
+
+  if (!match) {
+    return {}
+  }
+
+  const [, packageName, oldVersion, newVersion] = match
+
+  return { [packageName]: { delete: semverCoerce(oldVersion).raw, insert: semverCoerce(newVersion).raw } }
+}
+
 
 /***/ }),
 
@@ -9569,7 +9584,7 @@ const getModuleVersionChanges = (prDiff) => {
   const parsedDiffFiles = parse(prDiff)
   const packageJsonChanges = parsedDiffFiles.find((file) => file.newPath === 'package.json')
   if (!packageJsonChanges) {
-    return {}
+    return false
   }
 
   const moduleChanges = {}

src/action.js

@@ -48,7 +48,9 @@ module.exports = async function run() {
     }
 
     const prDiff = await client.getPullRequestDiff(pr.number)
-    const moduleChanges = getModuleVersionChanges(prDiff)
+
+    // Get changed modules from diff if available or from PR title as fallback
+    const moduleChanges = getModuleVersionChanges(prDiff) || parsePrTitle(pr)
 
     if (TARGET !== targetOptions.any) {
       logInfo(`Checking if the changes in the PR can be merged`)
@@ -98,3 +100,16 @@ function isAMajorReleaseBump(change) {
   const diff = semverDiff(semverCoerce(from), semverCoerce(to))
   return diff === targetOptions.major
 }
+
+function parsePrTitle(pullRequest) {
+  const expression = /bump (\S+) from (\S+) to (\S+)/i
+  const match = expression.exec(pullRequest.title)
+
+  if (!match) {
+    return {}
+  }
+
+  const [, packageName, oldVersion, newVersion] = match
+
+  return { [packageName]: { delete: semverCoerce(oldVersion).raw, insert: semverCoerce(newVersion).raw } }
+}

src/moduleVersionChanges.js

@@ -45,7 +45,7 @@ const getModuleVersionChanges = (prDiff) => {
   const parsedDiffFiles = parse(prDiff)
   const packageJsonChanges = parsedDiffFiles.find((file) => file.newPath === 'package.json')
   if (!packageJsonChanges) {
-    return {}
+    return false
   }
 
   const moduleChanges = {}

test/action.test.js

@@ -289,18 +289,20 @@ tap.test('should check submodules semver when target is set', async () => {
   sinon.assert.notCalled(stubs.mergeStub)
 })
 
-tap.test('should merge if no changes were made to package.json', async () => {
+tap.test('should merge major bump using PR title', async () => {
   const PR_NUMBER = Math.random()
+
   const { action, stubs } = buildStubbedAction({
     payload: {
       pull_request: {
         number: PR_NUMBER,
         user: { login: BOT_NAME },
+        title: 'build(deps): bump actions/checkout from 2 to 3'
       }
     },
     inputs: {
       PR_NUMBER,
-      TARGET: 'main',
+      TARGET: 'major',
       EXCLUDE_PKGS: ['react'],
     }
   })
@@ -312,3 +314,56 @@ tap.test('should merge if no changes were made to package.json', async () => {
   sinon.assert.called(stubs.approveStub)
   sinon.assert.called(stubs.mergeStub)
 })
+
+tap.test('should forbid major bump using PR title', async () => {
+  const PR_NUMBER = Math.random()
+
+  const { action, stubs } = buildStubbedAction({
+    payload: {
+      pull_request: {
+        number: PR_NUMBER,
+        user: { login: BOT_NAME },
+        title: 'build(deps): bump actions/checkout from 2 to 3'
+      }
+    },
+    inputs: {
+      PR_NUMBER,
+      TARGET: 'minor',
+      EXCLUDE_PKGS: ['react'],
+    }
+  })
+
+  stubs.prDiffStub.resolves(diffs.noPackageJsonChanges)
+
+  await action()
+
+  sinon.assert.notCalled(stubs.approveStub)
+  sinon.assert.notCalled(stubs.mergeStub)
+})
+
+
+tap.test('should not merge major bump if updating github-action-merge-dependabot', async () => {
+  const PR_NUMBER = Math.random()
+
+  const { action, stubs } = buildStubbedAction({
+    payload: {
+      pull_request: {
+        number: PR_NUMBER,
+        user: { login: BOT_NAME },
+        title: 'build(deps): bump github-action-merge-dependabot from 2 to 3'
+      }
+    },
+    inputs: {
+      PR_NUMBER,
+      TARGET: 'any',
+      EXCLUDE_PKGS: ['react'],
+    }
+  })
+
+  stubs.prDiffStub.resolves(diffs.noPackageJsonChanges)
+
+  await action()
+
+  sinon.assert.notCalled(stubs.approveStub)
+  sinon.assert.notCalled(stubs.mergeStub)
+})

test/moduleChanges.js

@@ -148,18 +148,19 @@ index d3dfd3d..bd28161 100644
 +        "github-action-merge-dependabot": "2.1.0",
 `,
   noPackageJsonChanges: `
-diff --git a/test/action.test.js b/test/action.test.js
-index e8c6572..751e69d 100644
---- a/test/action.test.js
-+++ b/test/action.test.js
-@@ -9,6 +9,7 @@ const core = require('@actions/core')
- const github = require('@actions/github')
- const toolkit = require('actions-toolkit')
-
-+
- const { diffs } = require('./moduleChanges')
- const actionLog = require('../src/log')
- const actionUtil = require('../src/util')
+diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
+index e790278..678e751 100644
+--- a/.github/workflows/ci.yml
++++ b/.github/workflows/ci.yml
+@@ -4,7 +4,7 @@ jobs:
+   build:
+     runs-on: ubuntu-latest
+     steps:
+-      - uses: actions/checkout@v2
++      - uses: actions/checkout@v3
+       - uses: actions/setup-node@v3
+         with:
+           node-version-file: '.nvmrc'
 `
 }