forked from daixiang0/gci
/
generate.go
91 lines (71 loc) · 1.36 KB
/
generate.go
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package main
import (
"bytes"
"go/format"
"os"
"runtime"
"strings"
"text/template"
"golang.org/x/tools/go/packages"
)
//go:generate go run .
const outputFile = "../pkg/gci/std.go"
const stdTemplate = `
package gci
// Code generated based on {{ .Version }}. DO NOT EDIT.
var standardPackages = map[string]struct{}{
{{- range $pkg := .Packages }}
"{{ $pkg }}": {},
{{- end}}
}
func isStandardPackage(pkg string) bool {
_, ok := standardPackages[pkg]
return ok
}
`
func main() {
err := generate()
if err != nil {
panic(err)
}
}
func generate() error {
all, err := packages.Load(nil, "std")
if err != nil {
return err
}
var pkgs []string
// go list std | grep -v vendor | grep -v internal
for _, pkg := range all {
if !strings.Contains(pkg.PkgPath, "internal") && !strings.Contains(pkg.PkgPath, "vendor") {
pkgs = append(pkgs, pkg.PkgPath)
}
}
file, err := os.Create(outputFile)
if err != nil {
return err
}
models := map[string]interface{}{
"Packages": pkgs,
"Version": runtime.Version(),
}
tlt, err := template.New("std-packages").Parse(stdTemplate)
if err != nil {
return err
}
b := &bytes.Buffer{}
err = tlt.Execute(b, models)
if err != nil {
return err
}
// gofmt
source, err := format.Source(b.Bytes())
if err != nil {
return err
}
_, err = file.Write(source)
if err != nil {
return err
}
return nil
}