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
|
package options
import (
"encoding/json"
"io"
"os"
"github.com/bcicen/jstream"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
)
func ValueTypeToString(valueType jstream.ValueType) string {
switch valueType {
case jstream.Unknown:
return "unknown"
case jstream.Null:
return "null"
case jstream.String:
return "string"
case jstream.Number:
return "number"
case jstream.Boolean:
return "boolean"
case jstream.Array:
return "array"
case jstream.Object:
return "object"
}
return "very strange"
}
func Process(inpath string, outpath string) error {
infile, err := os.Open(inpath)
if err != nil {
return errors.WithMessagef(err, "failed to open input file %s", inpath)
}
defer infile.Close()
outfile, err := os.Create(outpath)
if err != nil {
return errors.WithMessagef(err, "failed to open output file %s", outpath)
}
if outpath != "/dev/stdout" {
defer outfile.Close()
}
dec := jstream.NewDecoder(infile, 1).EmitKV()
var opt NixOption
ms, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
ErrorUnused: true,
Result: &opt,
Squash: true,
DecodeHook: mapstructure.TextUnmarshallerHookFunc(),
})
if err != nil {
return errors.WithMessage(err, "could not create mapstructure decoder")
}
_, err = outfile.WriteString("[\n")
if err != nil {
return errors.WithMessage(err, "could not write to output")
}
for mv := range dec.Stream() {
if err := dec.Err(); err != nil {
return errors.WithMessage(err, "could not decode JSON")
}
if mv.ValueType != jstream.Object {
return errors.Errorf("unexpected object type %s", ValueTypeToString(mv.ValueType))
}
kv := mv.Value.(jstream.KV)
if kv.Key == "_module.args" {
continue
}
x := kv.Value.(map[string]interface{})
x["option"] = kv.Key
err = ms.Decode(x)
if err != nil {
return errors.WithMessagef(err, "failed to decode option %#v", x)
}
b, err := json.MarshalIndent(opt, "", " ")
if err != nil {
return errors.WithMessagef(err, "failed to encode option %#v", opt)
}
_, err = outfile.Write(b)
if err != nil {
return errors.WithMessage(err, "failed to write to output")
}
_, err = outfile.WriteString(",\n")
if err != nil {
return errors.WithMessage(err, "failed to write to output")
}
}
_, err = outfile.Seek(-2, io.SeekCurrent)
if err != nil {
return errors.WithMessage(err, "could not write to output")
}
_, err = outfile.WriteString("]\n")
if err != nil {
return errors.WithMessage(err, "could not write to output")
}
return nil
}
|