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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
// +build ignore
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"go/format"
"io/ioutil"
"log"
"net/http"
"os"
"sort"
"strconv"
"strings"
"text/template"
"github.com/shurcooL/graphql/ident"
)
func main() {
flag.Parse()
err := run()
if err != nil {
log.Fatalln(err)
}
}
func run() error {
githubToken, ok := os.LookupEnv("GITHUB_TOKEN")
if !ok {
return fmt.Errorf("GITHUB_TOKEN environment variable not set")
}
schema, err := loadSchema(githubToken)
if err != nil {
return err
}
for filename, t := range templates {
var buf bytes.Buffer
err := t.Execute(&buf, schema)
if err != nil {
return err
}
out, err := format.Source(buf.Bytes())
if err != nil {
log.Println(err)
out = []byte("// gofmt error: " + err.Error() + "\n\n" + buf.String())
}
fmt.Println("writing", filename)
err = ioutil.WriteFile(filename, out, 0644)
if err != nil {
return err
}
}
return nil
}
func loadSchema(githubToken string) (schema interface{}, err error) {
req, err := http.NewRequest("GET", "https://api.github.com/graphql", nil)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "bearer "+githubToken)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
err = json.NewDecoder(resp.Body).Decode(&schema)
return schema, err
}
// Filename -> Template.
var templates = map[string]*template.Template{
"enum.go": t(`// Code generated by gen.go; DO NOT EDIT.
package githubv4
{{range .data.__schema.types | sortByName}}{{if and (eq .kind "ENUM") (not (internal .name))}}
{{template "enum" .}}
{{end}}{{end}}
{{- define "enum" -}}
// {{.name}} {{.description | endSentence}}
type {{.name}} string
// {{.description | fullSentence}}
const ({{range .enumValues}}
{{$.name}}{{.name | enumIdentifier}} {{$.name}} = {{.name | quote}} // {{.description | fullSentence}}{{end}}
)
{{- end -}}
`),
"input.go": t(`// Code generated by gen.go; DO NOT EDIT.
package githubv4
// Input represents one of the Input structs:
//
// {{join (inputObjects .data.__schema.types) ", "}}.
type Input interface{}
{{range .data.__schema.types | sortByName}}{{if eq .kind "INPUT_OBJECT"}}
{{template "inputObject" .}}
{{end}}{{end}}
{{- define "inputObject" -}}
// {{.name}} {{.description | endSentence}}
type {{.name}} struct {{"{"}}{{range .inputFields}}{{if eq .type.kind "NON_NULL"}}
// {{.description | fullSentence}} (Required.)
{{.name | identifier}} {{.type | type}} ` + "`" + `json:"{{.name}}"` + "`" + `{{end}}{{end}}
{{range .inputFields}}{{if ne .type.kind "NON_NULL"}}
// {{.description | fullSentence}} (Optional.)
{{.name | identifier}} {{.type | type}} ` + "`" + `json:"{{.name}},omitempty"` + "`" + `{{end}}{{end}}
}
{{- end -}}
`),
}
func t(text string) *template.Template {
// typeString returns a string representation of GraphQL type t.
var typeString func(t map[string]interface{}) string
typeString = func(t map[string]interface{}) string {
switch t["kind"] {
case "NON_NULL":
s := typeString(t["ofType"].(map[string]interface{}))
if !strings.HasPrefix(s, "*") {
panic(fmt.Errorf("nullable type %q doesn't begin with '*'", s))
}
return s[1:] // Strip star from nullable type to make it non-null.
case "LIST":
return "*[]" + typeString(t["ofType"].(map[string]interface{}))
default:
return "*" + t["name"].(string)
}
}
return template.Must(template.New("").Funcs(template.FuncMap{
"internal": func(s string) bool { return strings.HasPrefix(s, "__") },
"quote": strconv.Quote,
"join": strings.Join,
"sortByName": func(types []interface{}) []interface{} {
sort.Slice(types, func(i, j int) bool {
ni := types[i].(map[string]interface{})["name"].(string)
nj := types[j].(map[string]interface{})["name"].(string)
return ni < nj
})
return types
},
"inputObjects": func(types []interface{}) []string {
var names []string
for _, t := range types {
t := t.(map[string]interface{})
if t["kind"].(string) != "INPUT_OBJECT" {
continue
}
names = append(names, t["name"].(string))
}
sort.Strings(names)
return names
},
"identifier": func(name string) string { return ident.ParseLowerCamelCase(name).ToMixedCaps() },
"enumIdentifier": func(name string) string { return ident.ParseScreamingSnakeCase(name).ToMixedCaps() },
"type": typeString,
"endSentence": func(s string) string {
s = strings.ToLower(s[0:1]) + s[1:]
switch {
default:
s = "represents " + s
case strings.HasPrefix(s, "autogenerated "):
s = "is an " + s
case strings.HasPrefix(s, "specifies "):
// Do nothing.
}
if !strings.HasSuffix(s, ".") {
s += "."
}
return s
},
"fullSentence": func(s string) string {
if !strings.HasSuffix(s, ".") {
s += "."
}
return s
},
}).Parse(text))
}
|
