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sv.go
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sv.go
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package main
import (
"io"
"log"
"os"
"os/exec"
"sync"
"github.com/pkg/errors"
)
var (
svgoPath string
svgoOnce sync.Once
)
func hasSvgo() bool {
svgoOnce.Do(func() {
p, _ := exec.LookPath("svgo")
svgoPath = p
if svgoPath != "" {
log.Println("svgo detected, using it to read svg.")
}
})
return svgoPath != ""
}
func svgo(path string) (io.ReadCloser, error) {
if !hasSvgo() {
return nil, errors.New("no svgo")
}
cmd := exec.Command(svgoPath, "-i", path, "-o", "-")
cmd.Stderr = os.Stderr
o, err := cmd.StdoutPipe()
if err != nil {
return nil, errors.Wrap(err, "failed to get stdout pipe")
}
if err := cmd.Start(); err != nil {
o.Close()
return nil, errors.Wrap(err, "failed to start")
}
return cmdCloser{o, cmd}, nil
}
type cmdCloser struct {
io.ReadCloser
cmd *exec.Cmd
}
func (cc cmdCloser) Close() error {
closeErr := cc.ReadCloser.Close()
if err := cc.cmd.Wait(); err != nil {
return errors.Wrap(err, "svgo cannot finish")
}
return closeErr
}