/
main.go
96 lines (85 loc) · 1.87 KB
/
main.go
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package main
import (
"bytes"
"embed"
_ "embed"
"flag"
"fmt"
"go/format"
"io/fs"
"log"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/Masterminds/sprig/v3"
)
//go:embed templates
var tmpls embed.FS
func main() {
var fOutPath string
flag.StringVar(
&fOutPath,
"out",
"./gqlscan.go",
"output file path",
)
flag.Parse()
fl, err := os.OpenFile(
fOutPath,
os.O_CREATE|os.O_TRUNC|os.O_SYNC|os.O_WRONLY,
fs.FileMode(0644),
)
if err != nil {
log.Fatalf("opening output file: %v", err)
}
defer fl.Close()
t := template.New("").Funcs(sprig.TxtFuncMap())
if err := fs.WalkDir(
tmpls,
".",
func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
fileName := filepath.Base(path)
if !strings.HasSuffix(fileName, ".gotmpl") {
return nil
}
name := fileName[:len(fileName)-len(".gotmpl")]
c, err := fs.ReadFile(tmpls, path)
if err != nil {
return fmt.Errorf("reading template (%s): %w", path, err)
}
if name != "gqlscan" {
c = append([]byte(fmt.Sprintf("\n/*<%s>*/\n", name)), c...)
if c[len(c)-1] != '\n' {
c = append(c, '\n')
}
c = append(c, []byte(fmt.Sprintf("/*</%s>*/\n", name))...)
}
if _, err := t.New(name).
Funcs(sprig.TxtFuncMap()).
Parse(string(c)); err != nil {
return fmt.Errorf("parsing template (%s): %w", path, err)
}
return nil
},
); err != nil {
log.Fatalf("walking templates: %v", err)
}
var buf bytes.Buffer
if err := t.ExecuteTemplate(&buf, "gqlscan", nil); err != nil {
log.Fatalf("executing main template: %v", err)
}
p, err := format.Source(buf.Bytes())
if err != nil {
if _, err := fl.Write(buf.Bytes()); err != nil {
log.Fatalf("writing unformatted output: %v", err)
}
log.Fatalf("formatting: %v", err)
}
if _, err := fl.Write(p); err != nil {
log.Fatalf("writing formatted output: %v", err)
}
}