internal/action: move Labels and Milestones actions to a single file

IMHO there isn't a good reason why only Labels and Milestones had their
own action files while other objects like Issues didn't. This patch
moves both Labels and Milestones actions to the action.go generic file.

Signed-off-by: Bruno Meneguele <bmeneg@redhat.com>

internal/action/action.go

@@ -2,10 +2,14 @@ package action
 
 import (
 	"strconv"
+	"strings"
+	"time"
 
 	"github.com/rsteube/carapace"
+	"github.com/rsteube/carapace/pkg/cache"
 	"github.com/xanzy/go-gitlab"
 	"github.com/zaquestion/lab/internal/git"
+	lab "github.com/zaquestion/lab/internal/gitlab"
 )
 
 // Remotes returns a carapace.Action containing all possible remote values
@@ -86,3 +90,52 @@ func MergeRequests(mrList func(args []string) ([]*gitlab.MergeRequest, error)) c
 		return carapace.ActionValuesDescribed(values...)
 	})
 }
+
+// Labels returns a carapace.Action containing all possible labels
+func Labels(project string) carapace.Action {
+	return carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+		labels, err := lab.LabelList(project)
+		if err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		values := make([]string, len(labels)*2)
+		for index, label := range labels {
+			values[index*2] = label.Name
+			values[index*2+1] = label.Description
+		}
+		return carapace.ActionValuesDescribed(values...)
+	}).Cache(5*time.Minute, cache.String(project))
+}
+
+// MilestoneOpts store filtering information for the milestones to be
+// completed by Milestones().
+type MilestoneOpts struct {
+	Active bool
+}
+
+func (o MilestoneOpts) format() string {
+	if o.Active {
+		return "active"
+	}
+	return "closed"
+}
+
+// Milestones returns a carapace.Action containing all possible milestones with
+// their description
+func Milestones(project string, opts MilestoneOpts) carapace.Action {
+	return carapace.ActionCallback(func(c carapace.Context) carapace.Action {
+		state := opts.format()
+		milestones, err := lab.MilestoneList(project, &gitlab.ListMilestonesOptions{State: &state})
+		if err != nil {
+			return carapace.ActionMessage(err.Error())
+		}
+
+		values := make([]string, len(milestones)*2)
+		for index, milestone := range milestones {
+			values[index*2] = milestone.Title
+			values[index*2+1] = strings.SplitN(milestone.Description, "\n", 2)[0]
+		}
+		return carapace.ActionValuesDescribed(values...)
+	}).Cache(5*time.Minute, cache.String(project, opts.format()))
+}