1package operations
 2
 3import (
 4	"fmt"
 5	"strings"
 6
 7	"github.com/MichaelMure/git-bug/bug"
 8	"github.com/MichaelMure/git-bug/util/text"
 9)
10
11// SetTitleOperation will change the title of a bug
12
13var _ bug.Operation = SetTitleOperation{}
14
15type SetTitleOperation struct {
16	bug.OpBase
17	Title string `json:"title"`
18	Was   string `json:"was"`
19}
20
21func (op SetTitleOperation) Apply(snapshot bug.Snapshot) bug.Snapshot {
22	snapshot.Title = op.Title
23
24	return snapshot
25}
26
27func (op SetTitleOperation) Validate() error {
28	if err := bug.OpBaseValidate(op, bug.SetTitleOp); err != nil {
29		return err
30	}
31
32	if text.Empty(op.Title) {
33		return fmt.Errorf("title is empty")
34	}
35
36	if strings.Contains(op.Title, "\n") {
37		return fmt.Errorf("title should be a single line")
38	}
39
40	if !text.Safe(op.Title) {
41		return fmt.Errorf("title should be fully printable")
42	}
43
44	if strings.Contains(op.Was, "\n") {
45		return fmt.Errorf("previous title should be a single line")
46	}
47
48	if !text.Safe(op.Was) {
49		return fmt.Errorf("previous title should be fully printable")
50	}
51
52	return nil
53}
54
55func NewSetTitleOp(author bug.Person, title string, was string) SetTitleOperation {
56	return SetTitleOperation{
57		OpBase: bug.NewOpBase(bug.SetTitleOp, author),
58		Title:  title,
59		Was:    was,
60	}
61}
62
63// Convenience function to apply the operation
64func SetTitle(b bug.Interface, author bug.Person, title string) error {
65	it := bug.NewOperationIterator(b)
66
67	var lastTitleOp bug.Operation
68	for it.Next() {
69		op := it.Value()
70		if op.OpType() == bug.SetTitleOp {
71			lastTitleOp = op
72		}
73	}
74
75	var was string
76	if lastTitleOp != nil {
77		was = lastTitleOp.(SetTitleOperation).Title
78	} else {
79		was = b.FirstOp().(CreateOperation).Title
80	}
81
82	setTitleOp := NewSetTitleOp(author, title, was)
83
84	if err := setTitleOp.Validate(); err != nil {
85		return err
86	}
87
88	b.Append(setTitleOp)
89	return nil
90}