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main.go
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main.go
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// Copyright 2017 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.
// root2yoda converts ROOT files containing hbook-like values (H1D, H2D, ...)
// into YODA files.
//
// Example:
//
// $> root2yoda file1.root file2.root > out.yoda
// $> root2yoda -o out.yoda file1.root file2.root
// $> root2yoda -o out.yoda.gz file1.root file2.root
package main // import "go-hep.org/x/hep/cmd/root2yoda"
import (
"compress/gzip"
"flag"
"fmt"
"io"
"log"
"os"
"path/filepath"
"go-hep.org/x/hep/hbook/yodacnv"
"go-hep.org/x/hep/rootio"
)
func main() {
log.SetFlags(0)
log.SetPrefix("root2yoda: ")
flag.Usage = func() {
fmt.Fprintf(
os.Stderr,
`Usage: root2yoda [options] file1.root [file2.root [...]] > out.yoda
ex:
$> root2yoda file1.root file2.root > out.yoda
$> root2yoda -o out.yoda file1.root file2.root
$> root2yoda -o out.yoda.gz file1.root file2.root
options:
`,
)
flag.PrintDefaults()
}
oname := flag.String("o", "", "path to YODA output file")
flag.Parse()
if flag.NArg() < 1 {
log.Printf("missing input ROOT file name(s)")
flag.Usage()
flag.PrintDefaults()
}
var out io.WriteCloser = os.Stdout
if *oname != "" {
f, err := os.Create(*oname)
if err != nil {
log.Fatal(err)
}
defer func() {
err = f.Close()
if err != nil {
log.Fatal(err)
}
}()
out = f
if filepath.Ext(*oname) == ".gz" {
wz := gzip.NewWriter(f)
defer func() {
err = wz.Close()
if err != nil {
log.Fatal(err)
}
}()
out = wz
}
} else {
defer out.Close()
}
for _, fname := range flag.Args() {
log.Printf("processing %s\n", fname)
f, err := rootio.Open(fname)
if err != nil {
log.Fatalf("failed to open [%s]: %v\n", fname, err)
os.Exit(1)
}
defer f.Close()
for _, k := range uniq(f.Keys()) {
walk(out, k)
}
}
err := out.Close()
if err != nil {
log.Fatalf("error closing output file: %v\n", err)
}
}
func walk(w io.Writer, k rootio.Key) {
obj := k.Value()
switch obj := obj.(type) {
case rootio.Directory:
for _, k := range uniq(obj.Keys()) {
walk(w, k)
}
case yodacnv.Marshaler:
raw, err := obj.MarshalYODA()
if err != nil {
log.Fatalf("root2yoda: error converting %v: %v", k.Name(), err)
}
_, err = w.Write(raw)
if err != nil {
log.Fatalf("root2yoda: error writing %v: %v", k.Name(), err)
}
}
}
func uniq(keys []rootio.Key) []rootio.Key {
set := make(map[string]rootio.Key, len(keys))
for _, k := range keys {
kk, dup := set[k.Name()]
if dup && kk.Cycle() > k.Cycle() {
continue
}
set[k.Name()] = k
}
out := make([]rootio.Key, 0, len(set))
for _, k := range set {
out = append(out, k)
}
return out
}