/
input.go
59 lines (53 loc) · 895 Bytes
/
input.go
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package lazyio
import (
"compress/gzip"
"io"
pathlib "path"
"strings"
)
type Input struct {
Path string
Opener InputOpener
reader io.ReadCloser
compressed io.ReadCloser
}
func (i *Input) Close() error {
var err error
if i.reader != nil {
err = i.reader.Close()
}
if i.compressed != nil {
err := i.compressed.Close()
if err != nil {
return err
}
}
return err
}
func (i *Input) Open() (io.Reader, error) {
if i.reader == nil {
r, err := i.Opener.Open(i.Path)
if err != nil {
return nil, err
}
if strings.HasSuffix(i.Path, ".gz") {
i.compressed = r
r, err = gzip.NewReader(r)
if err != nil {
return nil, err
}
}
i.reader = r
}
return i.reader, nil
}
func (i *Input) StripExt() string {
s := i.Path
if strings.HasSuffix(s, ".gz") {
s = s[:len(s)-3]
}
if n := len(pathlib.Ext(s)); n > 0 {
s = s[:len(s)-n]
}
return s
}