Add the ability to use multiple labels as filters

models/issue.go

@@ -1140,10 +1140,20 @@ func (opts *IssuesOptions) setupSession(sess *xorm.Session) error {
 		if err != nil {
 			return err
 		}
-		if len(labelIDs) > 0 {
+		if len(labelIDs) == 1 {
 			sess.
 				Join("INNER", "issue_label", "issue.id = issue_label.issue_id").
 				In("issue_label.label_id", labelIDs)
+		} else if len(labelIDs) > 1 {
+			cond, args, _ := builder.ToSQL(builder.In("issue_label.label_id", labelIDs))
+			sess.
+				Where(fmt.Sprintf(`issue.id IN (
+					SELECT issue_label.issue_id
+					FROM issue_label
+					WHERE %s
+					GROUP BY issue_label.issue_id
+					HAVING COUNT(issue_label.label_id) = %d
+					)`, cond, len(labelIDs)), args...)
 		}
 	}
 	return nil
@@ -1322,9 +1332,19 @@ func GetIssueStats(opts *IssueStatsOptions) (*IssueStats, error) {
 			labelIDs, err := base.StringsToInt64s(strings.Split(opts.Labels, ","))
 			if err != nil {
 				log.Warn("Malformed Labels argument: %s", opts.Labels)
-			} else if len(labelIDs) > 0 {
+			} else if len(labelIDs) == 1 {
 				sess.Join("INNER", "issue_label", "issue.id = issue_label.issue_id").
 					In("issue_label.label_id", labelIDs)
+			} else if len(labelIDs) > 1 {
+				cond, args, _ := builder.ToSQL(builder.In("issue_label.label_id", labelIDs))
+				sess.
+					Where(fmt.Sprintf(`issue.id IN (
+					SELECT issue_label.issue_id
+					FROM issue_label
+					WHERE %s
+					GROUP BY issue_label.issue_id
+					HAVING COUNT(issue_label.label_id) = %d
+					)`, cond, len(labelIDs)), args...)
 			}
 		}
 

models/issue_label.go

@@ -60,6 +60,8 @@ type Label struct {
 	NumClosedIssues int
 	NumOpenIssues   int  `xorm:"-"`
 	IsChecked       bool `xorm:"-"`
+	QueryString     string
+	IsSelected      bool
 }
 
 // APIFormat converts a Label to the api.Label format
@@ -76,6 +78,25 @@ func (label *Label) CalOpenIssues() {
 	label.NumOpenIssues = label.NumIssues - label.NumClosedIssues
 }
 
+// LoadSelectedLabelsAfterClick calculates the set of selected labels when a label is clicked
+func (label *Label) LoadSelectedLabelsAfterClick(currentSelectedLabels []string) {
+	var labelQuerySlice []string
+	labelSelected := false
+	labelID := fmt.Sprint(label.ID)
+	for _, s := range currentSelectedLabels {
+		if s == labelID {
+			labelSelected = true
+		} else if s != "" {
+			labelQuerySlice = append(labelQuerySlice, s)
+		}
+	}
+	if !labelSelected {
+		labelQuerySlice = append(labelQuerySlice, labelID)
+	}
+	label.IsSelected = labelSelected
+	label.QueryString = strings.Join(labelQuerySlice, ",")
+}
+
 // ForegroundColor calculates the text color for labels based
 // on their background color.
 func (label *Label) ForegroundColor() template.CSS {

models/issue_test.go

@@ -191,13 +191,21 @@ func TestIssues(t *testing.T) {
 			},
 			[]int64{1, 2, 3, 5},
 		},
+		{
+			IssuesOptions{
+				Labels:   "1",
+				Page:     1,
+				PageSize: 4,
+			},
+			[]int64{2, 1},
+		},
 		{
 			IssuesOptions{
 				Labels:   "1,2",
 				Page:     1,
 				PageSize: 4,
 			},
-			[]int64{5, 2, 1},
+			[]int64{}, // issues with **both** label 1 and 2, none of these issues matches, TODO: add more tests
 		},
 	} {
 		issues, err := Issues(&test.Opts)

routers/repo/issue_label.go

@@ -5,6 +5,8 @@
 package repo
 
 import (
+	"strings"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/base"
@@ -69,6 +71,23 @@ func RetrieveLabels(ctx *context.Context) {
 	ctx.Data["SortType"] = ctx.Query("sort")
 }
 
+// RetrieveLabelsAndLoadSelectedLabels calculate query string when filtering issues/pulls
+func RetrieveLabelsAndLoadSelectedLabels(ctx *context.Context) {
+	labels, err := models.GetLabelsByRepoID(ctx.Repo.Repository.ID, ctx.Query("sort"))
+	if err != nil {
+		ctx.ServerError("RetrieveLabelsAndLoadSelectedLabels.GetLabels", err)
+		return
+	}
+	selectLabels := strings.Split(ctx.Query("labels"), ",")
+	for _, l := range labels {
+		l.CalOpenIssues()
+		l.LoadSelectedLabelsAfterClick(selectLabels)
+	}
+	ctx.Data["Labels"] = labels
+	ctx.Data["NumLabels"] = len(labels)
+	ctx.Data["SortType"] = ctx.Query("sort")
+}
+
 // NewLabel create new label for repository
 func NewLabel(ctx *context.Context, form auth.CreateLabelForm) {
 	ctx.Data["Title"] = ctx.Tr("repo.labels")

routers/routes/routes.go

@@ -585,7 +585,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 
 	m.Group("/:username/:reponame", func() {
 		m.Group("", func() {
-			m.Get("/^:type(issues|pulls)$", repo.RetrieveLabels, repo.Issues)
+			m.Get("/^:type(issues|pulls)$", repo.RetrieveLabelsAndLoadSelectedLabels, repo.Issues)
 			m.Get("/^:type(issues|pulls)$/:index", repo.ViewIssue)
 			m.Get("/labels/", context.CheckAnyUnit(models.UnitTypeIssues, models.UnitTypePullRequests), repo.RetrieveLabels, repo.Labels)
 			m.Get("/milestones", context.CheckAnyUnit(models.UnitTypeIssues, models.UnitTypePullRequests), repo.Milestones)

templates/repo/issue/list.tmpl

@@ -42,7 +42,7 @@
 						<div class="menu">
 							<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&milestone={{$.MilestoneID}}&assignee={{$.AssigneeID}}">{{.i18n.Tr "repo.issues.filter_label_no_select"}}</a>
 							{{range .Labels}}
-								<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.ID}}&milestone={{$.MilestoneID}}&assignee={{$.AssigneeID}}"><span class="octicon {{if eq $.SelectLabels .ID}}octicon-check{{end}}"></span><span class="label color" style="background-color: {{.Color}}"></span> {{.Name}}</a>
+								<a class="item" href="{{$.Link}}?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.QueryString}}&milestone={{$.MilestoneID}}&assignee={{$.AssigneeID}}"><span class="octicon {{if .IsSelected}}octicon-check{{end}}"></span><span class="label color" style="background-color: {{.Color}}"></span> {{.Name}}</a>
 							{{end}}
 						</div>
 					</div>