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|
package operations
import (
"fmt"
"io"
"io/ioutil"
"sort"
"github.com/MichaelMure/git-bug/bug"
)
var _ bug.Operation = LabelChangeOperation{}
// LabelChangeOperation define a Bug operation to add or remove labels
type LabelChangeOperation struct {
bug.OpBase
Added []bug.Label
Removed []bug.Label
}
// Apply apply the operation
func (op LabelChangeOperation) Apply(snapshot bug.Snapshot) bug.Snapshot {
// Add in the set
AddLoop:
for _, added := range op.Added {
for _, label := range snapshot.Labels {
if label == added {
// Already exist
continue AddLoop
}
}
snapshot.Labels = append(snapshot.Labels, added)
}
// Remove in the set
for _, removed := range op.Removed {
for i, label := range snapshot.Labels {
if label == removed {
snapshot.Labels[i] = snapshot.Labels[len(snapshot.Labels)-1]
snapshot.Labels = snapshot.Labels[:len(snapshot.Labels)-1]
}
}
}
// Sort
sort.Slice(snapshot.Labels, func(i, j int) bool {
return string(snapshot.Labels[i]) < string(snapshot.Labels[j])
})
return snapshot
}
func NewLabelChangeOperation(author bug.Person, added, removed []bug.Label) LabelChangeOperation {
return LabelChangeOperation{
OpBase: bug.NewOpBase(bug.LabelChangeOp, author),
Added: added,
Removed: removed,
}
}
// ChangeLabels is a convenience function to apply the operation
func ChangeLabels(out io.Writer, b bug.Interface, author bug.Person, add, remove []string) error {
// TODO: return a channel of result (like MergeAll) instead of formatting the result for the upper layers
var added, removed []bug.Label
if out == nil {
out = ioutil.Discard
}
snap := b.Compile()
for _, str := range add {
label := bug.Label(str)
// check for duplicate
if labelExist(added, label) {
fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str)
continue
}
// check that the label doesn't already exist
if labelExist(snap.Labels, label) {
fmt.Fprintf(out, "label \"%s\" is already set on this bug\n", str)
continue
}
added = append(added, label)
}
for _, str := range remove {
label := bug.Label(str)
// check for duplicate
if labelExist(removed, label) {
fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str)
continue
}
// check that the label actually exist
if !labelExist(snap.Labels, label) {
fmt.Fprintf(out, "label \"%s\" doesn't exist on this bug\n", str)
continue
}
removed = append(removed, label)
}
if len(added) == 0 && len(removed) == 0 {
return fmt.Errorf("no label added or removed")
}
labelOp := NewLabelChangeOperation(author, added, removed)
b.Append(labelOp)
return nil
}
func labelExist(labels []bug.Label, label bug.Label) bool {
for _, l := range labels {
if l == label {
return true
}
}
return false
}
|
