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gen.go
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gen.go
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//go:build ignore
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"go/format"
"net/http"
"os"
"strings"
"github.com/kenshaw/emoji"
)
func main() {
urlstr := flag.String("url", "https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json", "gemoji url")
out := flag.String("o", "gemoji.go", "out")
flag.Parse()
if err := run(context.Background(), *urlstr, *out); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
}
func run(ctx context.Context, urlstr, out string) error {
// generate data
buf, err := generate(ctx, urlstr)
if err != nil {
return err
}
// write
return os.WriteFile(out, buf, 0644)
}
func generate(ctx context.Context, urlstr string) ([]byte, error) {
// load gemoji data
req, err := http.NewRequest("GET", urlstr, nil)
if err != nil {
return nil, err
}
cl := &http.Client{}
res, err := cl.Do(req.WithContext(ctx))
if err != nil {
return nil, err
}
defer res.Body.Close()
// unmarshal
dec := json.NewDecoder(res.Body)
dec.DisallowUnknownFields()
var data []emoji.Emoji
if err := dec.Decode(&data); err != nil {
return nil, err
}
// build string
str := replacer.Replace(fmt.Sprintf(tpl, urlstr, data))
// format
return format.Source([]byte(str))
}
var replacer = strings.NewReplacer(
"{{", "{\n{",
"}, {", "},\n{",
"}}", "},\n}",
"emoji.Emoji", "Emoji",
)
const tpl = `package emoji
// Code generated by gen.go. DO NOT EDIT.
// Gemoji returns the set of original Gemoji emoji data.
//
// See: %s
func Gemoji() []Emoji {
return %#v
}
`