feat: Support for wildcards in branch excludes (#50)

* Specs for exclude wildcard support

* exclude config wildcard support

* Updated readme

* Update README.md

README.md

@@ -68,14 +68,15 @@ This GitHub app listens to the `pull_request.closed` webhook. If a pull request
 ## Configuration
 The optional app configuration YAML file should be saved as `.github/delete-merged-branch-config.yml`. At the moment it supports the following options:
 
-- `exclude` _(array)_ - list of branches that should not be automatically deleted after a merge. 
+- `exclude` _(array)_ - list of branches that should not be automatically deleted after a merge. Wildcards supported.
 
 Example `.github/delete-merged-branch-config.yml`:
 
 ```
 exclude: 
   - development
   - qa
+  - feature-*
 ```
 
 ## Release process

lib/delete-merged-branch.js

@@ -13,7 +13,7 @@ module.exports = async (context) => {
     return
   }
 
-  if (config.exclude.includes(branchName)) {
+  if (config.exclude.some((rule) => new RegExp(`^${rule.split('*').join('.*')}$`).test(branchName))) {
     context.log.info(`Branch ${branchName} excluded. Keeping ${context.payload.pull_request.head.label}`)
     return
   }

test/lib/delete-merged-branch.test.js

@@ -49,19 +49,37 @@ describe('deleteMergedBranch function', () => {
   })
 
   describe('branch is excluded in config', () => {
-    beforeEach(async () => {
+    it('should log it didn\'t delete the branch', async () => {
       context.config = jest.fn().mockReturnValue({ exclude: [context.payload.pull_request.head.ref] })
       context.payload.pull_request.head.label = 'foo:bar'
       await deleteMergedBranch(context)
-    })
-
-    it('should log it didn\'t delete the branch', () => {
       expect(context.log.info).toBeCalledWith(`Branch ${context.payload.pull_request.head.ref} excluded. Keeping ${context.payload.pull_request.head.label}`)
     })
 
-    it('should NOT call the deleteReference method', () => {
+    it('should NOT call the deleteReference method', async () => {
+      context.config = jest.fn().mockReturnValue({ exclude: [context.payload.pull_request.head.ref] })
+      context.payload.pull_request.head.label = 'foo:bar'
+      await deleteMergedBranch(context)
       expect(context.github.gitdata.deleteReference).not.toHaveBeenCalled()
     })
+
+    describe('wildcard expression is used', () => {
+      it('should check for wildcard in end of string', async () => {
+        const branchWilcard = `${context.payload.pull_request.head.ref.substr(0, 8)}*`
+        context.config = jest.fn().mockReturnValue({ exclude: ['test', branchWilcard] })
+        context.payload.pull_request.head.label = 'bar:foo'
+        await deleteMergedBranch(context)
+        expect(context.log.info).toBeCalledWith(`Branch ${context.payload.pull_request.head.ref} excluded. Keeping ${context.payload.pull_request.head.label}`)
+      })
+
+      it('should check for wildcard in beginning of string', async () => {
+        const branchWilcard = `*${context.payload.pull_request.head.ref.substr(1, 20)}`
+        context.config = jest.fn().mockReturnValue({ exclude: ['test', branchWilcard] })
+        context.payload.pull_request.head.label = 'bar:foobar'
+        await deleteMergedBranch(context)
+        expect(context.log.info).toBeCalledWith(`Branch ${context.payload.pull_request.head.ref} excluded. Keeping ${context.payload.pull_request.head.label}`)
+      })
+    })
   })
 
   describe('branch is merged', async () => {