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// +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 | clean | endSentence}}
type {{.name}} string
// {{.description | clean | fullSentence}}
const ({{range .enumValues}}
{{$.name}}{{.name | enumIdentifier}} {{$.name}} = {{.name | quote}} // {{.description | clean | 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 | clean | endSentence}}
type {{.name}} struct {{"{"}}{{range .inputFields}}{{if eq .type.kind "NON_NULL"}}
// {{.description | clean | fullSentence}} (Required.)
{{.name | identifier}} {{.type | type}} ` + "`" + `json:"{{.name}}"` + "`" + `{{end}}{{end}}
{{range .inputFields}}{{if ne .type.kind "NON_NULL"}}
// {{.description | clean | 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,
"clean": func(s string) string { return strings.Join(strings.Fields(s), " ") },
"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))
}
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