1package operations
  2
  3import (
  4	"fmt"
  5	"io"
  6	"io/ioutil"
  7	"sort"
  8
  9	"github.com/MichaelMure/git-bug/bug"
 10)
 11
 12// LabelChangeOperation will add or remove a set of labels
 13
 14var _ bug.Operation = LabelChangeOperation{}
 15
 16type LabelChangeOperation struct {
 17	bug.OpBase
 18	Added   []bug.Label
 19	Removed []bug.Label
 20}
 21
 22func (op LabelChangeOperation) Apply(snapshot bug.Snapshot) bug.Snapshot {
 23	// Add in the set
 24AddLoop:
 25	for _, added := range op.Added {
 26		for _, label := range snapshot.Labels {
 27			if label == added {
 28				// Already exist
 29				continue AddLoop
 30			}
 31		}
 32
 33		snapshot.Labels = append(snapshot.Labels, added)
 34	}
 35
 36	// Remove in the set
 37	for _, removed := range op.Removed {
 38		for i, label := range snapshot.Labels {
 39			if label == removed {
 40				snapshot.Labels[i] = snapshot.Labels[len(snapshot.Labels)-1]
 41				snapshot.Labels = snapshot.Labels[:len(snapshot.Labels)-1]
 42			}
 43		}
 44	}
 45
 46	// Sort
 47	sort.Slice(snapshot.Labels, func(i, j int) bool {
 48		return string(snapshot.Labels[i]) < string(snapshot.Labels[j])
 49	})
 50
 51	return snapshot
 52}
 53
 54func NewLabelChangeOperation(author bug.Person, added, removed []bug.Label) LabelChangeOperation {
 55	return LabelChangeOperation{
 56		OpBase:  bug.NewOpBase(bug.LabelChangeOp, author),
 57		Added:   added,
 58		Removed: removed,
 59	}
 60}
 61
 62// Convenience function to apply the operation
 63func ChangeLabels(out io.Writer, b *bug.Bug, author bug.Person, add, remove []string) error {
 64	var added, removed []bug.Label
 65
 66	if out == nil {
 67		out = ioutil.Discard
 68	}
 69
 70	snap := b.Compile()
 71
 72	for _, str := range add {
 73		label := bug.Label(str)
 74
 75		// check for duplicate
 76		if labelExist(added, label) {
 77			fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str)
 78			continue
 79		}
 80
 81		// check that the label doesn't already exist
 82		if labelExist(snap.Labels, label) {
 83			fmt.Fprintf(out, "label \"%s\" is already set on this bug\n", str)
 84			continue
 85		}
 86
 87		added = append(added, label)
 88	}
 89
 90	for _, str := range remove {
 91		label := bug.Label(str)
 92
 93		// check for duplicate
 94		if labelExist(removed, label) {
 95			fmt.Fprintf(out, "label \"%s\" is a duplicate\n", str)
 96			continue
 97		}
 98
 99		// check that the label actually exist
100		if !labelExist(snap.Labels, label) {
101			fmt.Fprintf(out, "label \"%s\" doesn't exist on this bug\n", str)
102			continue
103		}
104
105		removed = append(removed, label)
106	}
107
108	if len(added) == 0 && len(removed) == 0 {
109		return fmt.Errorf("no label added or removed")
110	}
111
112	labelOp := NewLabelChangeOperation(author, added, removed)
113
114	b.Append(labelOp)
115
116	return nil
117}
118
119func labelExist(labels []bug.Label, label bug.Label) bool {
120	for _, l := range labels {
121		if l == label {
122			return true
123		}
124	}
125
126	return false
127}