Scoped labels (#22585)

Add a new "exclusive" option per label. This makes it so that when the
label is named `scope/name`, no other label with the same `scope/`
prefix can be set on an issue.

The scope is determined by the last occurence of `/`, so for example
`scope/alpha/name` and `scope/beta/name` are considered to be in
different scopes and can coexist.

Exclusive scopes are not enforced by any database rules, however they
are enforced when editing labels at the models level, automatically
removing any existing labels in the same scope when either attaching a
new label or replacing all labels.

In menus use a circle instead of checkbox to indicate they function as
radio buttons per scope. Issue filtering by label ensures that only a
single scoped label is selected at a time. Clicking with alt key can be
used to remove a scoped label, both when editing individual issues and
batch editing.

Label rendering refactor for consistency and code simplification:

* Labels now consistently have the same shape, emojis and tooltips
everywhere. This includes the label list and label assignment menus.
* In label list, show description below label same as label menus.
* Don't use exactly black/white text colors to look a bit nicer.
* Simplify text color computation. There is no point computing luminance
in linear color space, as this is a perceptual problem and sRGB is
closer to perceptually linear.
* Increase height of label assignment menus to show more labels. Showing
only 3-4 labels at a time leads to a lot of scrolling.
* Render all labels with a new RenderLabel template helper function.

Label creation and editing in multiline modal menu:

* Change label creation to open a modal menu like label editing.
* Change menu layout to place name, description and colors on separate
lines.
* Don't color cancel button red in label editing modal menu.
* Align text to the left in model menu for better readability and
consistent with settings layout elsewhere.

Custom exclusive scoped label rendering:

* Display scoped label prefix and suffix with slightly darker and
lighter background color respectively, and a slanted edge between them
similar to the `/` symbol.
* In menus exclusive labels are grouped with a divider line.

---------

Co-authored-by: Yarden Shoham <hrsi88@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

models/fixtures/issue.yml

@@ -287,3 +287,20 @@
  created_unix: 1602935696
  updated_unix: 1602935696
  is_locked: false
+
+-
+ id: 18
+ repo_id: 55
+ index: 1
+ poster_id: 2
+ original_author_id: 0
+ name: issue for scoped labels
+ content: content
+ milestone_id: 0
+ priority: 0
+ is_closed: false
+ is_pull: false
+ num_comments: 0
+ created_unix: 946684830
+ updated_unix: 978307200
+ is_locked: false

models/fixtures/label.yml

@@ -4,6 +4,7 @@
  org_id: 0
  name: label1
  color: '#abcdef'
+ exclusive: false
  num_issues: 2
  num_closed_issues: 0
 
@@ -13,6 +14,7 @@
  org_id: 0
  name: label2
  color: '#000000'
+ exclusive: false
  num_issues: 1
  num_closed_issues: 1
 
@@ -22,6 +24,7 @@
  org_id: 3
  name: orglabel3
  color: '#abcdef'
+ exclusive: false
  num_issues: 0
  num_closed_issues: 0
 
@@ -31,6 +34,7 @@
  org_id: 3
  name: orglabel4
  color: '#000000'
+ exclusive: false
  num_issues: 1
  num_closed_issues: 0
 
@@ -40,5 +44,46 @@
  org_id: 0
  name: pull-test-label
  color: '#000000'
+ exclusive: false
+ num_issues: 0
+ num_closed_issues: 0
+
+-
+ id: 6
+ repo_id: 55
+ org_id: 0
+ name: unscoped_label
+ color: '#000000'
+ exclusive: false
+ num_issues: 0
+ num_closed_issues: 0
+
+-
+ id: 7
+ repo_id: 55
+ org_id: 0
+ name: scope/label1
+ color: '#000000'
+ exclusive: true
+ num_issues: 0
+ num_closed_issues: 0
+
+-
+ id: 8
+ repo_id: 55
+ org_id: 0
+ name: scope/label2
+ color: '#000000'
+ exclusive: true
+ num_issues: 0
+ num_closed_issues: 0
+
+-
+ id: 9
+ repo_id: 55
+ org_id: 0
+ name: scope/subscope/label2
+ color: '#000000'
+ exclusive: true
  num_issues: 0
  num_closed_issues: 0

models/fixtures/repository.yml

@@ -1622,3 +1622,15 @@
  is_archived: false
  is_private: true
  status: 0
+
+-
+ id: 55
+ owner_id: 2
+ owner_name: user2
+ lower_name: scoped_label
+ name: scoped_label
+ is_empty: false
+ is_archived: false
+ is_private: true
+ num_issues: 1
+ status: 0

models/fixtures/user.yml

@@ -66,7 +66,7 @@
  num_followers: 2
  num_following: 1
  num_stars: 2
- num_repos: 10
+ num_repos: 11
  num_teams: 0
  num_members: 0
  visibility: 0

models/issues/issue.go

@@ -538,6 +538,31 @@ func (ts labelSorter) Swap(i, j int) {
  []*Label(ts)[i], []*Label(ts)[j] = []*Label(ts)[j], []*Label(ts)[i]
 }
 
+// Ensure only one label of a given scope exists, with labels at the end of the
+// array getting preference over earlier ones.
+func RemoveDuplicateExclusiveLabels(labels []*Label) []*Label {
+ validLabels := make([]*Label, 0, len(labels))
+
+ for i, label := range labels {
+ scope := label.ExclusiveScope()
+ if scope != "" {
+ foundOther := false
+ for _, otherLabel := range labels[i+1:] {
+ if otherLabel.ExclusiveScope() == scope {
+ foundOther = true
+ break
+ }
+ }
+ if foundOther {
+ continue
+ }
+ }
+ validLabels = append(validLabels, label)
+ }
+
+ return validLabels
+}
+
 // ReplaceIssueLabels removes all current labels and add new labels to the issue.
 // Triggers appropriate WebHooks, if any.
 func ReplaceIssueLabels(issue *Issue, labels []*Label, doer *user_model.User) (err error) {
@@ -555,6 +580,8 @@ func ReplaceIssueLabels(issue *Issue, labels []*Label, doer *user_model.User) (e
  return err
  }
 
+ labels = RemoveDuplicateExclusiveLabels(labels)
+
  sort.Sort(labelSorter(labels))
  sort.Sort(labelSorter(issue.Labels))
 

models/issues/issue_test.go

@@ -25,7 +25,7 @@ import (
 func TestIssue_ReplaceLabels(t *testing.T) {
  assert.NoError(t, unittest.PrepareTestDatabase())
 
- testSuccess := func(issueID int64, labelIDs []int64) {
+ testSuccess := func(issueID int64, labelIDs, expectedLabelIDs []int64) {
  issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{ID: issueID})
  repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: issue.RepoID})
  doer := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
@@ -35,15 +35,20 @@ func TestIssue_ReplaceLabels(t *testing.T) {
  labels[i] = unittest.AssertExistsAndLoadBean(t, &issues_model.Label{ID: labelID, RepoID: repo.ID})
  }
  assert.NoError(t, issues_model.ReplaceIssueLabels(issue, labels, doer))
- unittest.AssertCount(t, &issues_model.IssueLabel{IssueID: issueID}, len(labelIDs))
- for _, labelID := range labelIDs {
+ unittest.AssertCount(t, &issues_model.IssueLabel{IssueID: issueID}, len(expectedLabelIDs))
+ for _, labelID := range expectedLabelIDs {
  unittest.AssertExistsAndLoadBean(t, &issues_model.IssueLabel{IssueID: issueID, LabelID: labelID})
  }
  }
 
- testSuccess(1, []int64{2})
- testSuccess(1, []int64{1, 2})
- testSuccess(1, []int64{})
+ testSuccess(1, []int64{2}, []int64{2})
+ testSuccess(1, []int64{1, 2}, []int64{1, 2})
+ testSuccess(1, []int64{}, []int64{})
+
+ // mutually exclusive scoped labels 7 and 8
+ testSuccess(18, []int64{6, 7}, []int64{6, 7})
+ testSuccess(18, []int64{7, 8}, []int64{8})
+ testSuccess(18, []int64{6, 8, 7}, []int64{6, 7})
 }
 
 func Test_GetIssueIDsByRepoID(t *testing.T) {
@@ -523,5 +528,5 @@ func TestCountIssues(t *testing.T) {
  assert.NoError(t, unittest.PrepareTestDatabase())
  count, err := issues_model.CountIssues(db.DefaultContext, &issues_model.IssuesOptions{})
  assert.NoError(t, err)
- assert.EqualValues(t, 17, count)
+ assert.EqualValues(t, 18, count)
 }

models/issues/label.go

@@ -7,8 +7,6 @@ package issues
 import (
  "context"
  "fmt"
- "html/template"
- "math"
  "regexp"
  "strconv"
  "strings"
@@ -89,6 +87,7 @@ type Label struct {
  RepoID int64 `xorm:"INDEX"`
  OrgID int64 `xorm:"INDEX"`
  Name string
+ Exclusive bool
  Description string
  Color string `xorm:"VARCHAR(7)"`
  NumIssues int
@@ -128,18 +127,22 @@ func (label *Label) CalOpenOrgIssues(ctx context.Context, repoID, labelID int64)
 }
 
 // LoadSelectedLabelsAfterClick calculates the set of selected labels when a label is clicked
-func (label *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []int64) {
+func (label *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []int64, currentSelectedExclusiveScopes []string) {
  var labelQuerySlice []string
  labelSelected := false
  labelID := strconv.FormatInt(label.ID, 10)
- for _, s := range currentSelectedLabels {
+ labelScope := label.ExclusiveScope()
+ for i, s := range currentSelectedLabels {
  if s == label.ID {
  labelSelected = true
  } else if -s == label.ID {
  labelSelected = true
  label.IsExcluded = true
  } else if s != 0 {
- labelQuerySlice = append(labelQuerySlice, strconv.FormatInt(s, 10))
+ // Exclude other labels in the same scope from selection
+ if s < 0 || labelScope == "" || labelScope != currentSelectedExclusiveScopes[i] {
+ labelQuerySlice = append(labelQuerySlice, strconv.FormatInt(s, 10))
+ }
  }
  }
  if !labelSelected {
@@ -159,49 +162,43 @@ func (label *Label) BelongsToRepo() bool {
  return label.RepoID > 0
 }
 
-// SrgbToLinear converts a component of an sRGB color to its linear intensity
-// See: https://en.wikipedia.org/wiki/SRGB#The_reverse_transformation_(sRGB_to_CIE_XYZ)
-func SrgbToLinear(color uint8) float64 {
- flt := float64(color) / 255
- if flt <= 0.04045 {
- return flt / 12.92
+// 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)
+ if err != nil {
+ return 0, 0, 0, err
  }
- return math.Pow((flt+0.055)/1.055, 2.4)
-}
-
-// Luminance returns the luminance of an sRGB color
-func Luminance(color uint32) float64 {
- r := SrgbToLinear(uint8(0xFF & (color >> 16)))
- g := SrgbToLinear(uint8(0xFF & (color >> 8)))
- b := SrgbToLinear(uint8(0xFF & color))
 
- // luminance ratios for sRGB
- return 0.2126*r + 0.7152*g + 0.0722*b
+ r := float64(uint8(0xFF & (uint32(color) >> 16)))
+ g := float64(uint8(0xFF & (uint32(color) >> 8)))
+ b := float64(uint8(0xFF & uint32(color)))
+ return r, g, b, nil
 }
 
-// LuminanceThreshold is the luminance at which white and black appear to have the same contrast
-// i.e. x such that 1.05 / (x + 0.05) = (x + 0.05) / 0.05
-// i.e. math.Sqrt(1.05*0.05) - 0.05
-const LuminanceThreshold float64 = 0.179
-
-// ForegroundColor calculates the text color for labels based
-// on their background color.
-func (label *Label) ForegroundColor() template.CSS {
+// 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 color, err := strconv.ParseUint(label.Color[1:], 16, 64); err == nil {
- // NOTE: see web_src/js/components/ContextPopup.vue for similar implementation
- luminance := Luminance(uint32(color))
-
- // prefer white or black based upon contrast
- if luminance < LuminanceThreshold {
- return template.CSS("#fff")
- }
- return template.CSS("#000")
+ if r, g, b, err := label.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
+ return brightness < 0.35
  }
  }
 
- // default to black
- return template.CSS("#000")
+ return false
+}
+
+// Return scope substring of label name, or empty string if none exists
+func (label *Label) ExclusiveScope() string {
+ if !label.Exclusive {
+ return ""
+ }
+ lastIndex := strings.LastIndex(label.Name, "/")
+ if lastIndex == -1 || lastIndex == 0 || lastIndex == len(label.Name)-1 {
+ return ""
+ }
+ return label.Name[:lastIndex]
 }
 
 // NewLabel creates a new label
@@ -253,7 +250,7 @@ func UpdateLabel(l *Label) error {
  if !LabelColorPattern.MatchString(l.Color) {
  return fmt.Errorf("bad color code: %s", l.Color)
  }
- return updateLabelCols(db.DefaultContext, l, "name", "description", "color")
+ return updateLabelCols(db.DefaultContext, l, "name", "description", "color", "exclusive")
 }
 
 // DeleteLabel delete a label
@@ -620,6 +617,29 @@ func newIssueLabel(ctx context.Context, issue *Issue, label *Label, doer *user_m
  return updateLabelCols(ctx, label, "num_issues", "num_closed_issue")
 }
 
+// Remove all issue labels in the given exclusive scope
+func RemoveDuplicateExclusiveIssueLabels(ctx context.Context, issue *Issue, label *Label, doer *user_model.User) (err error) {
+ scope := label.ExclusiveScope()
+ if scope == "" {
+ return nil
+ }
+
+ var toRemove []*Label
+ for _, issueLabel := range issue.Labels {
+ if label.ID != issueLabel.ID && issueLabel.ExclusiveScope() == scope {
+ toRemove = append(toRemove, issueLabel)
+ }
+ }
+
+ for _, issueLabel := range toRemove {
+ if err = deleteIssueLabel(ctx, issue, issueLabel, doer); err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
+
 // NewIssueLabel creates a new issue-label relation.
 func NewIssueLabel(issue *Issue, label *Label, doer *user_model.User) (err error) {
  if HasIssueLabel(db.DefaultContext, issue.ID, label.ID) {
@@ -641,6 +661,10 @@ func NewIssueLabel(issue *Issue, label *Label, doer *user_model.User) (err error
  return nil
  }
 
+ if err = RemoveDuplicateExclusiveIssueLabels(ctx, issue, label, doer); err != nil {
+ return nil
+ }
+
  if err = newIssueLabel(ctx, issue, label, doer); err != nil {
  return err
  }