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package fzf
import (
"bufio"
"io"
"os"
"os/exec"
"github.com/junegunn/fzf/src/util"
)
// Reader reads from command or standard input
type Reader struct {
pusher func(string)
eventBox *util.EventBox
}
// ReadSource reads data from the default command or from standard input
func (r *Reader) ReadSource() {
if util.IsTty() {
cmd := os.Getenv("FZF_DEFAULT_COMMAND")
if len(cmd) == 0 {
cmd = defaultCommand
}
r.readFromCommand(cmd)
} else {
r.readFromStdin()
}
r.eventBox.Set(EvtReadFin, nil)
}
func (r *Reader) feed(src io.Reader) {
reader := bufio.NewReader(src)
eof := false
Loop:
for !eof {
buf := []byte{}
iter := 0 // TODO: max size?
for {
// "ReadLine either returns a non-nil line or it returns an error, never both"
line, isPrefix, err := reader.ReadLine()
eof = err == io.EOF
if eof {
break
} else if err != nil {
break Loop
}
iter++
buf = append(buf, line...)
if !isPrefix {
break
}
}
if iter > 0 {
r.pusher(string(buf))
r.eventBox.Set(EvtReadNew, nil)
}
}
}
func (r *Reader) readFromStdin() {
r.feed(os.Stdin)
}
func (r *Reader) readFromCommand(cmd string) {
listCommand := exec.Command("sh", "-c", cmd)
out, err := listCommand.StdoutPipe()
if err != nil {
return
}
err = listCommand.Start()
if err != nil {
return
}
defer listCommand.Wait()
r.feed(out)
}
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