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copy.go
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copy.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.
package rcmd
import (
"fmt"
"log"
stdpath "path"
"regexp"
"go-hep.org/x/hep/groot"
"go-hep.org/x/hep/groot/riofs"
"go-hep.org/x/hep/groot/root"
"go-hep.org/x/hep/groot/rtree"
)
// Copy copies the content of the ROOT files fnames into the output
// ROOT file named oname.
func Copy(oname string, fnames []string) error {
o, err := groot.Create(oname)
if err != nil {
return fmt.Errorf("could not create output ROOT file %q: %w", oname, err)
}
defer o.Close()
var cmd copyCmd
for _, arg := range fnames {
err := cmd.process(o, arg)
if err != nil {
return err
}
}
err = o.Close()
if err != nil {
return fmt.Errorf("could not close output ROOT file %q: %w", oname, err)
}
return nil
}
type copyCmd struct{}
func (cmd copyCmd) process(o *riofs.File, arg string) error {
log.Printf("copying %q...", arg)
fname, sel, err := splitArg(arg)
if err != nil {
return err
}
re := regexp.MustCompile(sel)
f, err := groot.Open(fname)
if err != nil {
return fmt.Errorf("could not open input ROOT file %q: %w", fname, err)
}
defer f.Close()
err = riofs.Walk(f, func(path string, obj root.Object, err error) error {
if err != nil {
return err
}
name := path[len(f.Name()):]
if !re.MatchString(name) {
return nil
}
var (
dst riofs.Directory
dir = stdpath.Dir(name)
)
odst, err := riofs.Dir(o).Get(dir)
if err != nil {
v, err := riofs.Dir(o).Mkdir(dir)
if err != nil {
return fmt.Errorf("could not create directory %q: %w", dir, err)
}
odst = v.(root.Object)
}
dst = odst.(riofs.Directory)
return cmd.copyObj(dst, stdpath.Base(name), obj)
})
if err != nil {
return fmt.Errorf("could not copy input ROOT file: %w", err)
}
return nil
}
func (cmd copyCmd) copyObj(odir riofs.Directory, k string, obj root.Object) error {
var err error
switch obj := obj.(type) {
case rtree.Tree:
err = cmd.copyTree(odir, k, obj)
case riofs.Directory:
_, err = odir.Mkdir(k)
default:
err = odir.Put(k, obj)
}
if err != nil {
return fmt.Errorf("could not save object %q to output file: %w", k, err)
}
return nil
}
func (cmd copyCmd) copyTree(dir riofs.Directory, name string, tree rtree.Tree) error {
dst, err := rtree.NewWriter(dir, name, rtree.WriteVarsFromTree(tree))
if err != nil {
return fmt.Errorf("could not create output copy tree: %w", err)
}
_, err = rtree.Copy(dst, tree)
if err != nil {
return fmt.Errorf("could not copy tree %q: %w", name, err)
}
err = dst.Close()
if err != nil {
return fmt.Errorf("could not close copy tree %q: %w", name, err)
}
return nil
}