🌱 Allow tag prefixes in PR titles

verify/type.go

@@ -19,6 +19,7 @@ package main
 import (
 	"fmt"
 	"regexp"
+	"strings"
 
 	"github.com/google/go-github/v32/github"
 
@@ -28,6 +29,8 @@ import (
 // Extracted from kubernetes/test-infra/prow/plugins/wip/wip-label.go
 var wipRegex = regexp.MustCompile(`(?i)^\W?WIP\W`)
 
+var tagRegex = regexp.MustCompile(`^\[[\w-\.]*\]`)
+
 type prTitleTypeError struct {
 	title string
 }
@@ -53,8 +56,7 @@ More details can be found at [sigs.k8s.io/kubebuilder-release-tools/VERSIONING.m
 
 // verifyPRType checks that the PR title contains a prefix that defines its type
 func verifyPRType(pr *github.PullRequest) (string, string, error) {
-	// Remove the WIP prefix if found
-	title := wipRegex.ReplaceAllString(pr.GetTitle(), "")
+	title := trimTitle(pr.GetTitle())
 
 	prType, finalTitle := notes.PRTypeFromTitle(title)
 	if prType == notes.UncategorizedPR {
@@ -66,3 +68,16 @@ func verifyPRType(pr *github.PullRequest) (string, string, error) {
 	%s
 `, finalTitle), nil
 }
+
+func trimTitle(title string) string {
+	// Remove the WIP prefix if found.
+	title = wipRegex.ReplaceAllString(title, "")
+
+	// Trim to remove spaces after WIP.
+	title = strings.TrimSpace(title)
+
+	// Remove a tag prefix if found.
+	title = tagRegex.ReplaceAllString(title, "")
+
+	return strings.TrimSpace(title)
+}

verify/type_test.go

@@ -0,0 +1,60 @@
+/*
+Copyright 2021 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import "testing"
+
+func Test_trimTitle(t *testing.T) {
+	tests := []struct {
+		name  string
+		title string
+		want  string
+	}{
+		{
+			name:  "regular PR title",
+			title: "📖 book: Use relative links in generate CRDs doc",
+			want:  "📖 book: Use relative links in generate CRDs doc",
+		},
+		{
+			name:  "PR title with WIP",
+			title: "WIP 📖 book: Use relative links in generate CRDs doc",
+			want:  "📖 book: Use relative links in generate CRDs doc",
+		},
+		{
+			name:  "PR title with [WIP]",
+			title: "[WIP] 📖 book: Use relative links in generate CRDs doc",
+			want:  "📖 book: Use relative links in generate CRDs doc",
+		},
+		{
+			name:  "PR title with [release-1.0]",
+			title: "[release-1.0] 📖 book: Use relative links in generate CRDs doc",
+			want:  "📖 book: Use relative links in generate CRDs doc",
+		},
+		{
+			name:  "PR title with [WIP][release-1.0]",
+			title: "[WIP][release-1.0] 📖 book: Use relative links in generate CRDs doc",
+			want:  "📖 book: Use relative links in generate CRDs doc",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := trimTitle(tt.title); got != tt.want {
+				t.Errorf("trimTitle() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}