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fs_embed.go
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64 lines (50 loc) · 1.09 KB
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//go:build go1.16
// +build go1.16
package render
import (
"embed"
"io"
"io/fs"
"path/filepath"
)
// EmbedFileSystem implements FileSystem on top of an embed.FS.
type EmbedFileSystem struct {
embed.FS
}
var _ FileSystem = &EmbedFileSystem{}
func (e *EmbedFileSystem) Walk(root string, walkFn filepath.WalkFunc) error {
return fs.WalkDir(e.FS, root, func(path string, d fs.DirEntry, _ error) error {
if d == nil {
return nil
}
info, err := d.Info()
if err != nil {
return err
}
return walkFn(path, info, err)
})
}
type tmplFS struct {
fs.FS
}
func (tfs tmplFS) Walk(root string, walkFn filepath.WalkFunc) error {
return fs.WalkDir(tfs, root, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
info, err := d.Info()
return walkFn(path, info, err)
})
}
func (tfs tmplFS) ReadFile(filename string) ([]byte, error) {
f, err := tfs.Open(filename)
if err != nil {
return nil, err
}
defer f.Close()
return io.ReadAll(f)
}
// FS converts io/fs.FS to FileSystem.
func FS(oriFS fs.FS) FileSystem { //nolint:ireturn
return tmplFS{oriFS}
}