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main.go
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/
main.go
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// Copyright ©2020 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 podio-gen generates a complete EDM from a PODIO YAML file definition.
//
// Usage: podio-gen [OPTIONS] edm.yaml
//
// Example:
//
// $> podio-gen -p myedm -o out.go -r 'edm4hep::->edm_,ExNamespace::->exns_' edm.yaml
//
// Options:
// -o string
// path to the output file containing the generated code (default "out.go")
// -p string
// package name for the PODIO generated types (default "podio")
// -r string
// comma-separated list of rewrite rules (e.g., 'edm4hep::->edm_')
package main // import "go-hep.org/x/hep/cmd/podio-gen"
import (
"flag"
"fmt"
"io"
"log"
"os"
)
func main() {
log.SetPrefix("podio: ")
log.SetFlags(0)
var (
pkg = flag.String("p", "podio", "package name for the PODIO generated types")
oname = flag.String("o", "out.go", "path to the output file containing the generated code")
rewrite = flag.String("r", "", "comma-separated list of rewrite rules (e.g., 'edm4hep::->edm_')")
)
flag.Usage = func() {
fmt.Printf(`podio-gen generates a complete EDM from a PODIO YAML file definition.
Usage: podio-gen [OPTIONS] edm.yaml
Example:
$> podio-gen -p myedm -o out.go -r 'edm4hep::->edm_,ExNamespace::->exns_' edm.yaml
Options:
`)
flag.PrintDefaults()
}
flag.Parse()
switch flag.NArg() {
case 0:
flag.Usage()
log.Fatalf("missing input PODIO file")
case 1:
// ok
default:
flag.Usage()
log.Fatalf("too many input PODIO files")
}
out, err := os.Create(*oname)
if err != nil {
log.Fatalf("could not create output file %q: %+v", *oname, err)
}
defer out.Close()
fname := flag.Arg(0)
err = process(out, *pkg, fname, *rewrite)
if err != nil {
log.Fatalf("could not process %q: %+v", fname, err)
}
err = out.Close()
if err != nil {
log.Fatalf("could not save output file %q: %+v", *oname, err)
}
}
func process(w io.Writer, pkg, fname, rules string) error {
g, err := newGenerator(w, pkg, fname, rules)
if err != nil {
return fmt.Errorf("could not create PODIO generator: %w", err)
}
err = g.generate()
if err != nil {
return fmt.Errorf("could not generate PODIO code for %q: %w", fname, err)
}
return nil
}