[FEATURE] Add failOnMatch option

README.md

@@ -69,6 +69,15 @@ jobs:
           excludeTitle: 'true' # optional: this excludes the title of a pull request
           checkAllCommitMessages: 'true' # optional: this checks all commits associated with a pull request
           accessToken: ${{ secrets.GITHUB_TOKEN }} # github access token is only required if checkAllCommitMessages is true
+      - name: Squash/Fixup Check
+        uses: gsactions/commit-message-checker@v2
+        with:
+          pattern: '^(fixup|squash)'
+          failOnMatch: 'true' # optional: this will fail the test if the pattern matches a commit message
+          error: Don't forget to squash/fixup your commits before merging
+          excludeDescription: 'true'
+          checkAllCommitMessages: 'true'
+          accessToken: ${{ secrets.GITHUB_TOKEN }}
       - name: Check for Resolves / Fixes
         uses: gsactions/commit-message-checker@v2
         with:

__tests__/commit-message-checker.test.ts

@@ -77,51 +77,123 @@ describe('commit-message-checker tests', () => {
     ).rejects.toThrow('MESSAGES not defined.')
   })
 
-  it('check fails single message', async () => {
+  describe('single message, without a match', () => {
     const checkerArguments: ICheckerArguments = {
       pattern: 'some-pattern',
       flags: '',
       error: 'some-error',
       messages: ['some-message']
     }
-    await expect(
-      commitMessageChecker.checkCommitMessages(checkerArguments)
-    ).rejects.toThrow('some-error')
+
+    it('fails by default', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages(checkerArguments)
+      ).rejects.toThrow('some-error')
+    })
+
+    it('succeeds via `failOnMatch`', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages({
+          ...checkerArguments,
+          failOnMatch: true
+        })
+      ).resolves.toBeUndefined()
+    })
   })
 
-  it('check fails multiple messages', async () => {
+  describe('single message, with a match', () => {
+    const checkerArguments: ICheckerArguments = {
+      pattern: '.*',
+      flags: '',
+      error: 'some-error',
+      messages: ['some-message']
+    }
+
+    it('succeeds by default', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages(checkerArguments)
+      ).resolves.toBeUndefined()
+    })
+
+    it('fails via `failOnMatch`', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages({
+          ...checkerArguments,
+          failOnMatch: true
+        })
+      ).rejects.toThrow('some-error')
+    })
+  })
+
+  describe('multiple messages, with a single match', () => {
     const checkerArguments: ICheckerArguments = {
       pattern: 'some-pattern',
       flags: '',
       error: 'some-error',
       messages: ['some-message', 'some-pattern']
     }
-    await expect(
-      commitMessageChecker.checkCommitMessages(checkerArguments)
-    ).rejects.toThrow('some-error')
+
+    it('fails by default', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages(checkerArguments)
+      ).rejects.toThrow('some-error')
+    })
+
+    it('fails via `failOnMatch`', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages({
+          ...checkerArguments,
+          failOnMatch: true
+        })
+      ).rejects.toThrow('some-error')
+    })
   })
 
-  it('check succeeds on single message', async () => {
+  describe('multiple messages, without any match', () => {
     const checkerArguments: ICheckerArguments = {
-      pattern: '.*',
+      pattern: 'some-pattern',
       flags: '',
       error: 'some-error',
-      messages: ['some-message']
+      messages: ['some-message', 'other-message']
     }
-    await expect(
-      commitMessageChecker.checkCommitMessages(checkerArguments)
-    ).resolves.toBeUndefined()
+
+    it('fails by default', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages(checkerArguments)
+      ).rejects.toThrow('some-error')
+    })
+
+    it('succeeds via `failOnMatch`', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages({
+          ...checkerArguments,
+          failOnMatch: true
+        })
+      ).resolves.toBeUndefined()
+    })
   })
 
-  it('check succeeds on multiple messages', async () => {
+  describe('multiple messages, all matching', () => {
     const checkerArguments: ICheckerArguments = {
       pattern: '.*',
       flags: '',
       error: 'some-error',
       messages: ['some-message', 'other-message']
     }
-    await expect(
-      commitMessageChecker.checkCommitMessages(checkerArguments)
-    ).resolves.toBeUndefined()
+
+    it('succeeds by default', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages(checkerArguments)
+      ).resolves.toBeUndefined()
+    })
+
+    it('fails via `failOnMatch`', async () => {
+      await expect(
+        commitMessageChecker.checkCommitMessages({
+          ...checkerArguments,
+          failOnMatch: true
+        })
+      ).rejects.toThrow('some-error')
+    })
   })
 })

action.yml

@@ -10,12 +10,16 @@ inputs:
     required: false
     default: 'gm'
   error:
-    description: 'A error message which will be returned in case of an error.'
+    description: 'An error message which will be returned in case of an error.'
     required: true
   excludeTitle:
     description: 'Setting this input to true will exclude the Pull Request title from the check.'
     required: false
     default: 'false'
+  failOnMatch:
+    description: 'Setting this input to true will reverse the logic so that a positive match will fail the check.'
+    required: false
+    default: 'false'
   excludeDescription:
     description: 'Setting this input to true will exclude the Pull Request description from the check.'
     required: false

dist/index.js

@@ -89,9 +89,9 @@ function checkCommitMessages(args) {
         }
         // Check messages
         let result = true;
-        core.info(`Checking commit messages against "${args.pattern}"...`);
+        core.info(`Checking commit messages ${args.failOnMatch ? 'do not ' : ''}match "${args.pattern}"...`);
         for (const message of args.messages) {
-            if (checkMessage(message, args.pattern, args.flags)) {
+            if (checkMessage(message, args.pattern, args.flags, args.failOnMatch)) {
                 core.info(`- OK: "${message}"`);
             }
             else {
@@ -113,9 +113,10 @@ exports.checkCommitMessages = checkCommitMessages;
  * @param     pattern regex pattern for the check.
  * @returns   boolean
  */
-function checkMessage(message, pattern, flags) {
+function checkMessage(message, pattern, flags, failOnMatch) {
     const regex = new RegExp(pattern, flags);
-    return regex.test(message);
+    const result = regex.test(message);
+    return failOnMatch ? !result : result;
 }
 
 
@@ -200,6 +201,9 @@ function getInputs() {
         // Get error message
         result.error = core.getInput('error', { required: true });
         core.debug(`error: ${result.error}`);
+        // Get failOnMatch
+        result.failOnMatch = core.getInput('failOnMatch') === 'true';
+        core.debug(`failOnMatch: ${result.failOnMatch}`);
         // Get excludeTitle
         const excludeTitleStr = core.getInput('excludeTitle');
         core.debug(`excludeTitle: ${excludeTitleStr}`);

src/commit-message-checker.ts

@@ -26,6 +26,7 @@ import * as core from '@actions/core'
  */
 export interface ICheckerArguments {
   pattern: string
+  failOnMatch?: boolean
   flags: string
   error: string
   messages: string[]
@@ -66,10 +67,14 @@ export async function checkCommitMessages(
   // Check messages
   let result = true
 
-  core.info(`Checking commit messages against "${args.pattern}"...`)
+  core.info(
+    `Checking commit messages ${args.failOnMatch ? 'do not ' : ''}match "${
+      args.pattern
+    }"...`
+  )
 
   for (const message of args.messages) {
-    if (checkMessage(message, args.pattern, args.flags)) {
+    if (checkMessage(message, args.pattern, args.flags, args.failOnMatch)) {
       core.info(`- OK: "${message}"`)
     } else {
       core.info(`- failed: "${message}"`)
@@ -93,8 +98,10 @@ export async function checkCommitMessages(
 function checkMessage(
   message: string,
   pattern: string,
-  flags: string
+  flags: string,
+  failOnMatch?: boolean
 ): boolean {
   const regex = new RegExp(pattern, flags)
-  return regex.test(message)
+  const result = regex.test(message)
+  return failOnMatch ? !result : result
 }

src/input-helper.ts

@@ -52,6 +52,10 @@ export async function getInputs(): Promise<ICheckerArguments> {
   result.error = core.getInput('error', {required: true})
   core.debug(`error: ${result.error}`)
 
+  // Get failOnMatch
+  result.failOnMatch = core.getInput('failOnMatch') === 'true'
+  core.debug(`failOnMatch: ${result.failOnMatch}`)
+
   // Get excludeTitle
   const excludeTitleStr = core.getInput('excludeTitle')
   core.debug(`excludeTitle: ${excludeTitleStr}`)