Add loading yaml label template files (go-gitea#22976)

Extract from go-gitea#11669 and enhancement to go-gitea#22585 to support exclusive
scoped labels in label templates

* Move label template functionality to label module
* Fix handling of color codes
* Add Advanced label template

models/issues/label.go

@@ -7,12 +7,12 @@ package issues
 import (
 	"context"
 	"fmt"
-	"regexp"
 	"strconv"
 	"strings"
 
 	"code.gitea.io/gitea/models/db"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/label"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 
@@ -78,9 +78,6 @@ func (err ErrLabelNotExist) Unwrap() error {
 	return util.ErrNotExist
 }
 
-// LabelColorPattern is a regexp witch can validate LabelColor
-var LabelColorPattern = regexp.MustCompile("^#?(?:[0-9a-fA-F]{6}|[0-9a-fA-F]{3})$")
-
 // Label represents a label of repository for issues.
 type Label struct {
 	ID              int64 `xorm:"pk autoincr"`
@@ -109,35 +106,35 @@ func init() {
 }
 
 // CalOpenIssues sets the number of open issues of a label based on the already stored number of closed issues.
-func (label *Label) CalOpenIssues() {
-	label.NumOpenIssues = label.NumIssues - label.NumClosedIssues
+func (l *Label) CalOpenIssues() {
+	l.NumOpenIssues = l.NumIssues - l.NumClosedIssues
 }
 
 // CalOpenOrgIssues calculates the open issues of a label for a specific repo
-func (label *Label) CalOpenOrgIssues(ctx context.Context, repoID, labelID int64) {
+func (l *Label) CalOpenOrgIssues(ctx context.Context, repoID, labelID int64) {
 	counts, _ := CountIssuesByRepo(ctx, &IssuesOptions{
 		RepoID:   repoID,
 		LabelIDs: []int64{labelID},
 		IsClosed: util.OptionalBoolFalse,
 	})
 
 	for _, count := range counts {
-		label.NumOpenRepoIssues += count
+		l.NumOpenRepoIssues += count
 	}
 }
 
 // LoadSelectedLabelsAfterClick calculates the set of selected labels when a label is clicked
-func (label *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []int64, currentSelectedExclusiveScopes []string) {
+func (l *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []int64, currentSelectedExclusiveScopes []string) {
 	var labelQuerySlice []string
 	labelSelected := false
-	labelID := strconv.FormatInt(label.ID, 10)
-	labelScope := label.ExclusiveScope()
+	labelID := strconv.FormatInt(l.ID, 10)
+	labelScope := l.ExclusiveScope()
 	for i, s := range currentSelectedLabels {
-		if s == label.ID {
+		if s == l.ID {
 			labelSelected = true
-		} else if -s == label.ID {
+		} else if -s == l.ID {
 			labelSelected = true
-			label.IsExcluded = true
+			l.IsExcluded = true
 		} else if s != 0 {
 			// Exclude other labels in the same scope from selection
 			if s < 0 || labelScope == "" || labelScope != currentSelectedExclusiveScopes[i] {
@@ -148,23 +145,23 @@ func (label *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []int64,
 	if !labelSelected {
 		labelQuerySlice = append(labelQuerySlice, labelID)
 	}
-	label.IsSelected = labelSelected
-	label.QueryString = strings.Join(labelQuerySlice, ",")
+	l.IsSelected = labelSelected
+	l.QueryString = strings.Join(labelQuerySlice, ",")
 }
 
 // BelongsToOrg returns true if label is an organization label
-func (label *Label) BelongsToOrg() bool {
-	return label.OrgID > 0
+func (l *Label) BelongsToOrg() bool {
+	return l.OrgID > 0
 }
 
 // BelongsToRepo returns true if label is a repository label
-func (label *Label) BelongsToRepo() bool {
-	return label.RepoID > 0
+func (l *Label) BelongsToRepo() bool {
+	return l.RepoID > 0
 }
 
 // Get color as RGB values in 0..255 range
-func (label *Label) ColorRGB() (float64, float64, float64, error) {
-	color, err := strconv.ParseUint(label.Color[1:], 16, 64)
+func (l *Label) ColorRGB() (float64, float64, float64, error) {
+	color, err := strconv.ParseUint(l.Color[1:], 16, 64)
 	if err != nil {
 		return 0, 0, 0, err
 	}
@@ -176,9 +173,9 @@ func (label *Label) ColorRGB() (float64, float64, float64, error) {
 }
 
 // Determine if label text should be light or dark to be readable on background color
-func (label *Label) UseLightTextColor() bool {
-	if strings.HasPrefix(label.Color, "#") {
-		if r, g, b, err := label.ColorRGB(); err == nil {
+func (l *Label) UseLightTextColor() bool {
+	if strings.HasPrefix(l.Color, "#") {
+		if r, g, b, err := l.ColorRGB(); err == nil {
 			// Perceived brightness from: https://www.w3.org/TR/AERT/#color-contrast
 			// In the future WCAG 3 APCA may be a better solution
 			brightness := (0.299*r + 0.587*g + 0.114*b) / 255
@@ -190,40 +187,26 @@ func (label *Label) UseLightTextColor() bool {
 }
 
 // Return scope substring of label name, or empty string if none exists
-func (label *Label) ExclusiveScope() string {
-	if !label.Exclusive {
+func (l *Label) ExclusiveScope() string {
+	if !l.Exclusive {
 		return ""
 	}
-	lastIndex := strings.LastIndex(label.Name, "/")
-	if lastIndex == -1 || lastIndex == 0 || lastIndex == len(label.Name)-1 {
+	lastIndex := strings.LastIndex(l.Name, "/")
+	if lastIndex == -1 || lastIndex == 0 || lastIndex == len(l.Name)-1 {
 		return ""
 	}
-	return label.Name[:lastIndex]
+	return l.Name[:lastIndex]
 }
 
 // NewLabel creates a new label
-func NewLabel(ctx context.Context, label *Label) error {
-	if !LabelColorPattern.MatchString(label.Color) {
-		return fmt.Errorf("bad color code: %s", label.Color)
-	}
-
-	// normalize case
-	label.Color = strings.ToLower(label.Color)
-
-	// add leading hash
-	if label.Color[0] != '#' {
-		label.Color = "#" + label.Color
-	}
-
-	// convert 3-character shorthand into 6-character version
-	if len(label.Color) == 4 {
-		r := label.Color[1]
-		g := label.Color[2]
-		b := label.Color[3]
-		label.Color = fmt.Sprintf("#%c%c%c%c%c%c", r, r, g, g, b, b)
+func NewLabel(ctx context.Context, l *Label) error {
+	color, err := label.NormalizeColor(l.Color)
+	if err != nil {
+		return err
 	}
+	l.Color = color
 
-	return db.Insert(ctx, label)
+	return db.Insert(ctx, l)
 }
 
 // NewLabels creates new labels
@@ -234,11 +217,14 @@ func NewLabels(labels ...*Label) error {
 	}
 	defer committer.Close()
 
-	for _, label := range labels {
-		if !LabelColorPattern.MatchString(label.Color) {
-			return fmt.Errorf("bad color code: %s", label.Color)
+	for _, l := range labels {
+		color, err := label.NormalizeColor(l.Color)
+		if err != nil {
+			return err
 		}
-		if err := db.Insert(ctx, label); err != nil {
+		l.Color = color
+
+		if err := db.Insert(ctx, l); err != nil {
 			return err
 		}
 	}
@@ -247,15 +233,18 @@ func NewLabels(labels ...*Label) error {
 
 // UpdateLabel updates label information.
 func UpdateLabel(l *Label) error {
-	if !LabelColorPattern.MatchString(l.Color) {
-		return fmt.Errorf("bad color code: %s", l.Color)
+	color, err := label.NormalizeColor(l.Color)
+	if err != nil {
+		return err
 	}
+	l.Color = color
+
 	return updateLabelCols(db.DefaultContext, l, "name", "description", "color", "exclusive")
 }
 
 // DeleteLabel delete a label
 func DeleteLabel(id, labelID int64) error {
-	label, err := GetLabelByID(db.DefaultContext, labelID)
+	l, err := GetLabelByID(db.DefaultContext, labelID)
 	if err != nil {
 		if IsErrLabelNotExist(err) {
 			return nil
@@ -271,10 +260,10 @@ func DeleteLabel(id, labelID int64) error {
 
 	sess := db.GetEngine(ctx)
 
-	if label.BelongsToOrg() && label.OrgID != id {
+	if l.BelongsToOrg() && l.OrgID != id {
 		return nil
 	}
-	if label.BelongsToRepo() && label.RepoID != id {
+	if l.BelongsToRepo() && l.RepoID != id {
 		return nil
 	}
 
@@ -682,14 +671,14 @@ func newIssueLabels(ctx context.Context, issue *Issue, labels []*Label, doer *us
 	if err = issue.LoadRepo(ctx); err != nil {
 		return err
 	}
-	for _, label := range labels {
+	for _, l := range labels {
 		// Don't add already present labels and invalid labels
-		if HasIssueLabel(ctx, issue.ID, label.ID) ||
-			(label.RepoID != issue.RepoID && label.OrgID != issue.Repo.OwnerID) {
+		if HasIssueLabel(ctx, issue.ID, l.ID) ||
+			(l.RepoID != issue.RepoID && l.OrgID != issue.Repo.OwnerID) {
 			continue
 		}
 
-		if err = newIssueLabel(ctx, issue, label, doer); err != nil {
+		if err = newIssueLabel(ctx, issue, l, doer); err != nil {
 			return fmt.Errorf("newIssueLabel: %w", err)
 		}
 	}

models/issues/label_test.go

@@ -15,8 +15,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-// TODO TestGetLabelTemplateFile
-
 func TestLabel_CalOpenIssues(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	label := unittest.AssertExistsAndLoadBean(t, &issues_model.Label{ID: 1})

modules/label/label.go

@@ -0,0 +1,46 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package label
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+// colorPattern is a regexp which can validate label color
+var colorPattern = regexp.MustCompile("^#?(?:[0-9a-fA-F]{6}|[0-9a-fA-F]{3})$")
+
+// Label represents label information loaded from template
+type Label struct {
+	Name        string `yaml:"name"`
+	Color       string `yaml:"color"`
+	Description string `yaml:"description,omitempty"`
+	Exclusive   bool   `yaml:"exclusive,omitempty"`
+}
+
+// NormalizeColor normalizes a color string to a 6-character hex code
+func NormalizeColor(color string) (string, error) {
+	// normalize case
+	color = strings.TrimSpace(strings.ToLower(color))
+
+	// add leading hash
+	if len(color) == 6 || len(color) == 3 {
+		color = "#" + color
+	}
+
+	if !colorPattern.MatchString(color) {
+		return "", fmt.Errorf("bad color code: %s", color)
+	}
+
+	// convert 3-character shorthand into 6-character version
+	if len(color) == 4 {
+		r := color[1]
+		g := color[2]
+		b := color[3]
+		color = fmt.Sprintf("#%c%c%c%c%c%c", r, r, g, g, b, b)
+	}
+
+	return color, nil
+}