1 files changed, 108 insertions, 0 deletions
diff --git a/commands/label.go b/commands/label.go
new file mode 100644
index 00000000..ad3a388b
--- /dev/null
+++ b/commands/label.go
@@ -0,0 +1,108 @@
+package commands
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"github.com/MichaelMure/git-bug/bug"
+	"github.com/MichaelMure/git-bug/bug/operations"
+	"github.com/MichaelMure/git-bug/repository"
+)
+
+var labelFlagSet = flag.NewFlagSet("label", flag.ExitOnError)
+
+var (
+	labelRemove = newFlagSet.Bool("r", false, "Remove a label")
+)
+
+func runLabel(repo repository.Repo, args []string) error {
+	labelFlagSet.Parse(args)
+	args = labelFlagSet.Args()
+
+	if len(args) == 0 {
+		return errors.New("You must provide a bug id")
+	}
+
+	if len(args) == 1 {
+		return errors.New("You must provide a label")
+	}
+
+	prefix := args[0]
+
+	b, err := bug.FindBug(repo, prefix)
+	if err != nil {
+		return err
+	}
+
+	author, err := bug.GetUser(repo)
+	if err != nil {
+		return err
+	}
+
+	var added, removed []bug.Label
+
+	snap := b.Compile()
+
+	for _, arg := range args[1:] {
+		label := bug.Label(arg)
+
+		if *labelRemove {
+			// check for duplicate
+			if labelExist(removed, label) {
+				fmt.Printf("label \"%s\" is a duplicate\n", arg)
+				continue
+			}
+
+			// check that the label actually exist
+			if !labelExist(snap.Labels, label) {
+				fmt.Printf("label \"%s\" doesn't exist on this bug\n", arg)
+				continue
+			}
+
+			removed = append(removed, label)
+		} else {
+			// check for duplicate
+			if labelExist(added, label) {
+				fmt.Printf("label \"%s\" is a duplicate\n", arg)
+				continue
+			}
+
+			// check that the label doesn't already exist
+			if labelExist(snap.Labels, label) {
+				fmt.Printf("label \"%s\" is already set on this bug\n", arg)
+				continue
+			}
+
+			added = append(added, label)
+		}
+	}
+
+	if len(added) == 0 && len(removed) == 0 {
+		return errors.New("no label added or removed")
+	}
+
+	labelOp := operations.NewLabelChangeOperation(author, added, removed)
+
+	b.Append(labelOp)
+
+	err = b.Commit(repo)
+
+	return err
+}
+
+func labelExist(labels []bug.Label, label bug.Label) bool {
+	for _, l := range labels {
+		if l == label {
+			return true
+		}
+	}
+
+	return false
+}
+
+var labelCmd = &Command{
+	Description: "Manipulate bug's label",
+	Usage:       "<id> [<option>...] [<label>...]",
+	flagSet:     labelFlagSet,
+	RunMethod:   runLabel,
+}