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// Copyright (c) 2020-2022 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// gen-atomicint generates an atomic wrapper around an integer type.
//
// gen-atomicint -name Int32 -wrapped int32 -file out.go
//
// The generated wrapper will use the functions in the sync/atomic package
// named after the generated type.
package main
import (
"bytes"
"embed"
"errors"
"flag"
"fmt"
"go/format"
"io"
"log"
"os"
"text/template"
"time"
)
func main() {
log.SetFlags(0)
if err := run(os.Args[1:]); err != nil {
log.Fatalf("%+v", err)
}
}
func run(args []string) error {
var opts struct {
Name string
Wrapped string
File string
Unsigned bool
}
flag := flag.NewFlagSet("gen-atomicint", flag.ContinueOnError)
flag.StringVar(&opts.Name, "name", "", "name of the generated type (e.g. Int32)")
flag.StringVar(&opts.Wrapped, "wrapped", "", "name of the wrapped type (e.g. int32)")
flag.StringVar(&opts.File, "file", "", "output file path (default: stdout)")
flag.BoolVar(&opts.Unsigned, "unsigned", false, "whether the type is unsigned")
if err := flag.Parse(args); err != nil {
return err
}
if len(opts.Name) == 0 || len(opts.Wrapped) == 0 {
return errors.New("flags -name and -wrapped are required")
}
var w io.Writer = os.Stdout
if file := opts.File; len(file) > 0 {
f, err := os.Create(file)
if err != nil {
return fmt.Errorf("create %q: %v", file, err)
}
defer f.Close()
w = f
}
data := struct {
Name string
Wrapped string
Unsigned bool
ToYear int
}{
Name: opts.Name,
Wrapped: opts.Wrapped,
Unsigned: opts.Unsigned,
ToYear: time.Now().Year(),
}
var buff bytes.Buffer
if err := _tmpl.ExecuteTemplate(&buff, "wrapper.tmpl", data); err != nil {
return fmt.Errorf("render template: %v", err)
}
bs, err := format.Source(buff.Bytes())
if err != nil {
return fmt.Errorf("reformat source: %v", err)
}
io.WriteString(w, "// @generated Code generated by gen-atomicint.\n\n")
_, err = w.Write(bs)
return err
}
var (
//go:embed *.tmpl
_tmplFS embed.FS
_tmpl = template.Must(template.New("atomicint").ParseFS(_tmplFS, "*.tmpl"))
)
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