1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
package bug
import (
"encoding/json"
"fmt"
"reflect"
"github.com/MichaelMure/git-bug/repository"
"github.com/MichaelMure/git-bug/util/git"
)
const formatVersion = 1
// OperationPack represent an ordered set of operation to apply
// to a Bug. These operations are stored in a single Git commit.
//
// These commits will be linked together in a linear chain of commits
// inside Git to form the complete ordered chain of operation to
// apply to get the final state of the Bug
type OperationPack struct {
Operations []Operation
// Private field so not serialized by gob
commitHash git.Hash
}
var operations map[OperationType]reflect.Type
func Register(t OperationType, op interface{}) {
if operations == nil {
operations = make(map[OperationType]reflect.Type)
}
operations[t] = reflect.TypeOf(op)
}
func (opp *OperationPack) MarshalJSON() ([]byte, error) {
return json.Marshal(struct {
Version uint `json:"version"`
Operations []Operation `json:"ops"`
}{
Version: formatVersion,
Operations: opp.Operations,
})
}
func (opp *OperationPack) UnmarshalJSON(data []byte) error {
aux := struct {
Version uint `json:"version"`
Operations []json.RawMessage `json:"ops"`
}{}
if err := json.Unmarshal(data, &aux); err != nil {
return err
}
if aux.Version != formatVersion {
return fmt.Errorf("unknown format version %v", aux.Version)
}
for _, raw := range aux.Operations {
var t struct {
OperationType OperationType `json:"type"`
}
if err := json.Unmarshal(raw, &t); err != nil {
return err
}
opType, ok := operations[t.OperationType]
if !ok {
return fmt.Errorf("unknown operation type %v", t.OperationType)
}
op := reflect.New(opType).Interface()
if err := json.Unmarshal(raw, op); err != nil {
return err
}
deref := reflect.ValueOf(op).Elem().Interface()
opp.Operations = append(opp.Operations, deref.(Operation))
}
return nil
}
// Append a new operation to the pack
func (opp *OperationPack) Append(op Operation) {
opp.Operations = append(opp.Operations, op)
}
// IsEmpty tell if the OperationPack is empty
func (opp *OperationPack) IsEmpty() bool {
return len(opp.Operations) == 0
}
// IsValid tell if the OperationPack is considered valid
func (opp *OperationPack) IsValid() bool {
return !opp.IsEmpty()
}
// Write will serialize and store the OperationPack as a git blob and return
// its hash
func (opp *OperationPack) Write(repo repository.Repo) (git.Hash, error) {
data, err := json.Marshal(opp)
if err != nil {
return "", err
}
hash, err := repo.StoreData(data)
if err != nil {
return "", err
}
return hash, nil
}
// Make a deep copy
func (opp *OperationPack) Clone() OperationPack {
clone := OperationPack{
Operations: make([]Operation, len(opp.Operations)),
commitHash: opp.commitHash,
}
for i, op := range opp.Operations {
clone.Operations[i] = op
}
return clone
}
|
