feat(cc): subject-line bang for breaking change (#88)

closes #87

Adds support for conventionalcommits.org/en/v1.0.0/#commit-message-with-to-draw-attention-to-breaking-change

Author: Jason Kuhrt

src/lib/conventional-commit.spec.ts

@@ -7,6 +7,8 @@ describe(calcBumpType.name, () => {
     expect(calcBumpType(false, ['unknown', 'feat: 1'])).toEqual('minor')
     expect(calcBumpType(false, ['unknown\n\nBREAKING CHANGE: foo\nfoobar'])).toEqual(null)
     expect(calcBumpType(false, ['unknown', 'fix: 1\n\nBREAKING CHANGE: foo'])).toEqual('major')
+    expect(calcBumpType(false, ['unknown', 'fix!: 1\n\nBREAKING CHANGE: foo'])).toEqual('major')
+    expect(calcBumpType(false, ['unknown', 'fix!: 1'])).toEqual('major')
   })
 
   describe('initial development', () => {

src/lib/conventional-commit.ts

@@ -74,15 +74,15 @@ export type ConventionalCommit = {
   completesInitialDevelopment: boolean
 }
 
-const pattern = /^([^:\r\n(]+)(?:\(([^\r\n()]+)\))?:\s*([^\r\n]+)[\n\r]*(.*)$/s
+const pattern = /^([^:\r\n(!]+)(?:\(([^\r\n()]+)\))?(!)?:\s*([^\r\n]+)[\n\r]*(.*)$/s
 
 export function parse(message: string): null | ConventionalCommit {
   const result = message.match(pattern)
   if (!result) return null
-  const [, type, scope, description, rest] = result
+  const [, type, scope, breakingChangeMarker, description, rest] = result
 
   let completesInitialDevelopment = false
-  let breakingChange = null
+  let breakingChange = breakingChangeMarker === undefined ? null : 'No Explanation'
   let body = null
   let footers: ConventionalCommit['footers'] = []