forked from vmware-archive/fly
/
diff.go
152 lines (118 loc) · 3.22 KB
/
diff.go
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
package setpipelinehelpers
import (
"fmt"
"io"
"reflect"
"strings"
"github.com/aryann/difflib"
"github.com/concourse/atc"
"github.com/mgutz/ansi"
"github.com/onsi/gomega/gexec"
"gopkg.in/yaml.v2"
)
type Index interface {
FindEquivalent(interface{}) (interface{}, bool)
Slice() []interface{}
}
type Diffs []Diff
type Diff struct {
Before interface{}
After interface{}
}
func name(v interface{}) string {
return reflect.ValueOf(v).FieldByName("Name").String()
}
func (diff Diff) Render(to io.Writer, label string) {
indent := gexec.NewPrefixedWriter(" ", to)
if diff.Before != nil && diff.After != nil {
fmt.Fprintf(to, ansi.Color("%s %s has changed:", "yellow")+"\n", label, name(diff.Before))
payloadA, _ := yaml.Marshal(diff.Before)
payloadB, _ := yaml.Marshal(diff.After)
renderDiff(indent, string(payloadA), string(payloadB))
} else if diff.Before != nil {
fmt.Fprintf(to, ansi.Color("%s %s has been removed:", "yellow")+"\n", label, name(diff.Before))
payloadA, _ := yaml.Marshal(diff.Before)
renderDiff(indent, string(payloadA), "")
} else {
fmt.Fprintf(to, ansi.Color("%s %s has been added:", "yellow")+"\n", label, name(diff.After))
payloadB, _ := yaml.Marshal(diff.After)
renderDiff(indent, "", string(payloadB))
}
}
type GroupIndex atc.GroupConfigs
func (index GroupIndex) Slice() []interface{} {
slice := make([]interface{}, len(index))
for i, object := range index {
slice[i] = object
}
return slice
}
func (index GroupIndex) FindEquivalent(obj interface{}) (interface{}, bool) {
return atc.GroupConfigs(index).Lookup(name(obj))
}
type JobIndex atc.JobConfigs
func (index JobIndex) Slice() []interface{} {
slice := make([]interface{}, len(index))
for i, object := range index {
slice[i] = object
}
return slice
}
func (index JobIndex) FindEquivalent(obj interface{}) (interface{}, bool) {
return atc.JobConfigs(index).Lookup(name(obj))
}
type ResourceIndex atc.ResourceConfigs
func (index ResourceIndex) Slice() []interface{} {
slice := make([]interface{}, len(index))
for i, object := range index {
slice[i] = object
}
return slice
}
func (index ResourceIndex) FindEquivalent(obj interface{}) (interface{}, bool) {
return atc.ResourceConfigs(index).Lookup(name(obj))
}
func diffIndices(oldIndex Index, newIndex Index) Diffs {
diffs := Diffs{}
for _, thing := range oldIndex.Slice() {
newThing, found := newIndex.FindEquivalent(thing)
if !found {
diffs = append(diffs, Diff{
Before: thing,
After: nil,
})
continue
}
if !reflect.DeepEqual(thing, newThing) {
diffs = append(diffs, Diff{
Before: thing,
After: newThing,
})
}
}
for _, thing := range newIndex.Slice() {
_, found := oldIndex.FindEquivalent(thing)
if !found {
diffs = append(diffs, Diff{
Before: nil,
After: thing,
})
continue
}
}
return diffs
}
func renderDiff(to io.Writer, a, b string) {
diffs := difflib.Diff(strings.Split(a, "\n"), strings.Split(b, "\n"))
for _, diff := range diffs {
text := diff.Payload
switch diff.Delta {
case difflib.RightOnly:
fmt.Fprintf(to, "%s\n", ansi.Color(text, "green"))
case difflib.LeftOnly:
fmt.Fprintf(to, "%s\n", ansi.Color(text, "red"))
case difflib.Common:
fmt.Fprintf(to, "%s\n", text)
}
}
}