/
main.go
112 lines (91 loc) · 1.89 KB
/
main.go
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// Copyright ©2018 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Command root-gen-streamer generates a StreamerInfo for ROOT and user types.
package main // import "go-hep.org/x/hep/groot/cmd/root-gen-streamer"
import (
"bytes"
"flag"
"fmt"
"io"
"log"
"os"
"strings"
"go-hep.org/x/hep/groot/rdict"
)
var (
typeNames = flag.String("t", "", "comma-separated list of type names")
pkgPath = flag.String("p", "", "package import path")
output = flag.String("o", "", "output file name")
verbose = flag.Bool("v", false, "enable verbose mode")
)
func main() {
log.SetPrefix("root-gen-streamer: ")
log.SetFlags(0)
flag.Usage = func() {
fmt.Fprintf(
os.Stderr,
`Usage: root-gen-streamer [options]
ex:
$> root-gen-streamer -p image -t Point -o streamers_gen.go
$> root-gen-streamer -p go-hep.org/x/hep/hbook -t Dist0D,Dist1D,Dist2D -o foo_streamer_gen.go
options:
`,
)
flag.PrintDefaults()
}
flag.Parse()
if *typeNames == "" {
flag.Usage()
os.Exit(2)
}
types := strings.Split(*typeNames, ",")
var (
err error
out io.WriteCloser
buf = new(bytes.Buffer)
)
err = generate(buf, *pkgPath, types)
if err != nil {
log.Fatal(err)
}
switch *output {
case "":
out = os.Stdout
default:
out, err = os.Create(*output)
if err != nil {
log.Fatal(err)
}
defer out.Close()
}
_, err = io.Copy(out, buf)
if err != nil {
log.Fatal(err)
}
err = out.Close()
if err != nil {
log.Fatal(err)
}
}
func generate(w io.Writer, pkg string, types []string) error {
g, err := rdict.NewGenStreamer(pkg, *verbose)
if err != nil {
return err
}
for _, t := range types {
err := g.Generate(t)
if err != nil {
log.Fatal(err)
}
}
buf, err := g.Format()
if err != nil {
return err
}
_, err = w.Write(buf)
if err != nil {
return err
}
return nil
}