cheat/vendor/github.com/go-git/go-billy/v5/util/walk.go

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package util
import (
"os"
"path/filepath"
"github.com/go-git/go-billy/v5"
)
// walk recursively descends path, calling walkFn
// adapted from https://golang.org/src/path/filepath/path.go
func walk(fs billy.Filesystem, path string, info os.FileInfo, walkFn filepath.WalkFunc) error {
if !info.IsDir() {
return walkFn(path, info, nil)
}
names, err := readdirnames(fs, path)
err1 := walkFn(path, info, err)
// If err != nil, walk can't walk into this directory.
// err1 != nil means walkFn want walk to skip this directory or stop walking.
// Therefore, if one of err and err1 isn't nil, walk will return.
if err != nil || err1 != nil {
// The caller's behavior is controlled by the return value, which is decided
// by walkFn. walkFn may ignore err and return nil.
// If walkFn returns SkipDir, it will be handled by the caller.
// So walk should return whatever walkFn returns.
return err1
}
for _, name := range names {
filename := filepath.Join(path, name)
fileInfo, err := fs.Lstat(filename)
if err != nil {
if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
return err
}
} else {
err = walk(fs, filename, fileInfo, walkFn)
if err != nil {
if !fileInfo.IsDir() || err != filepath.SkipDir {
return err
}
}
}
}
return nil
}
// Walk walks the file tree rooted at root, calling fn for each file or
// directory in the tree, including root. All errors that arise visiting files
// and directories are filtered by fn: see the WalkFunc documentation for
// details.
//
// The files are walked in lexical order, which makes the output deterministic
// but requires Walk to read an entire directory into memory before proceeding
// to walk that directory. Walk does not follow symbolic links.
//
// Function adapted from https://github.com/golang/go/blob/3b770f2ccb1fa6fecc22ea822a19447b10b70c5c/src/path/filepath/path.go#L500
func Walk(fs billy.Filesystem, root string, walkFn filepath.WalkFunc) error {
info, err := fs.Lstat(root)
if err != nil {
err = walkFn(root, nil, err)
} else {
err = walk(fs, root, info, walkFn)
}
if err == filepath.SkipDir {
return nil
}
return err
}