source: code/trunk/vendor/github.com/yosssi/gcss/write.go@ 67

package gcss

import (
        "bufio"
        "io"
        "os"
)

// writeFlusher is the interface that groups the basic Write and Flush methods.
type writeFlusher interface {
        io.Writer
        Flush() error
}

var newBufWriter = func(w io.Writer) writeFlusher {
        return bufio.NewWriter(w)
}

// write writes the input byte data to the CSS file.
func write(path string, bc <-chan []byte, berrc <-chan error) (<-chan struct{}, <-chan error) {
        done := make(chan struct{})
        errc := make(chan error)

        go func() {
                f, err := os.Create(path)

                if err != nil {
                        errc <- err
                        return
                }

                defer f.Close()

                w := newBufWriter(f)

                for {
                        select {
                        case b, ok := <-bc:
                                if !ok {
                                        if err := w.Flush(); err != nil {
                                                errc <- err
                                                return
                                        }

                                        done <- struct{}{}

                                        return
                                }

                                if _, err := w.Write(b); err != nil {
                                        errc <- err
                                        return
                                }
                        case err := <-berrc:
                                errc <- err
                                return
                        }
                }
        }()

        return done, errc
}