From aed2c223188bb7ee04046976a4e1249e1451d8ca Mon Sep 17 00:00:00 2001
From: Andrew Rynhard <andrew@andrewrynhard.com>
Date: Thu, 4 Oct 2018 10:48:49 -0700
Subject: [PATCH] fix(policy): update regex to allow optional scope (#61)

---
 pkg/enforcer/enforcer.go                         |  3 +++
 .../conventionalcommit/conventionalcommit.go     | 16 ++++++++++------
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/pkg/enforcer/enforcer.go b/pkg/enforcer/enforcer.go
index dee7155f..918dee20 100644
--- a/pkg/enforcer/enforcer.go
+++ b/pkg/enforcer/enforcer.go
@@ -58,10 +58,13 @@ func New() (*Conform, error) {
 // Enforce enforces all policies defined in the conform.yaml file.
 func (c *Conform) Enforce() error {
 	for _, p := range c.Policies {
+		fmt.Printf("Enforcing policy %q: ", p.Type)
 		err := c.enforce(p)
 		if err != nil {
+			fmt.Printf("failed\n")
 			return err
 		}
+		fmt.Printf("passed\n")
 	}
 	err := c.Pipeline.Build(c.Metadata, c.Stages, c.Tasks)
 	if err != nil {
diff --git a/pkg/policy/conventionalcommit/conventionalcommit.go b/pkg/policy/conventionalcommit/conventionalcommit.go
index 02d8c15d..019f8c13 100644
--- a/pkg/policy/conventionalcommit/conventionalcommit.go
+++ b/pkg/policy/conventionalcommit/conventionalcommit.go
@@ -24,7 +24,7 @@ const MaxNumberOfCommitCharacters = 72
 
 // HeaderRegex is the regular expression used for Conventional Commits
 // 1.0.0-beta.1.
-const HeaderRegex = `^(\w*)\(([^)]+)\):\s{1}(.*)($|\n{2})`
+const HeaderRegex = `^(\w*)(\(([^)]+)\))?:\s{1}(.*)($|\n{2})`
 
 // TypeFeat is a commit of the type fix patches a bug in your codebase
 // (this correlates with PATCH in semantic versioning).
@@ -41,7 +41,7 @@ func (c *Conventional) Compliance(metadata *metadata.Metadata, options ...policy
 		return
 	}
 	groups := parseHeader(metadata.Git.Message)
-	if len(groups) != 5 {
+	if len(groups) != 6 {
 		report.Errors = append(report.Errors, fmt.Errorf("Invalid commit format: %s", metadata.Git.Message))
 		return
 	}
@@ -83,20 +83,24 @@ func ValidateType(report *policy.Report, groups []string, types []string) {
 
 // ValidateScope returns the commit scope.
 func ValidateScope(report *policy.Report, groups []string, scopes []string) {
+	// Scope is optional.
+	if groups[3] == "" {
+		return
+	}
 	for _, scope := range scopes {
-		if scope == groups[2] {
+		if scope == groups[3] {
 			return
 		}
 	}
-	report.Errors = append(report.Errors, fmt.Errorf("Invalid scope: %s", groups[2]))
+	report.Errors = append(report.Errors, fmt.Errorf("Invalid scope: %s", groups[3]))
 }
 
 // ValidateDescription returns the commit description.
 func ValidateDescription(report *policy.Report, groups []string) {
-	if len(groups[3]) <= 72 && len(groups[3]) != 0 {
+	if len(groups[4]) <= 72 && len(groups[4]) != 0 {
 		return
 	}
-	report.Errors = append(report.Errors, fmt.Errorf("Invalid description: %s", groups[3]))
+	report.Errors = append(report.Errors, fmt.Errorf("Invalid description: %s", groups[4]))
 }
 
 func parseHeader(message string) []string {