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package input
import (
"fmt"
"io"
"os"
"os/signal"
"strings"
)
// readOptions is option for read func
type readOptions struct {
// mask hides user input and will be matched by maskVal.
mask bool
maskVal string
}
// read reads input from UI.Reader
func (i *UI) read(opts *readOptions) (string, error) {
i.once.Do(i.setDefault)
// sigCh is channel which is watch Interruptted signal (SIGINT)
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, os.Interrupt)
defer signal.Stop(sigCh)
var resultStr string
var resultErr error
doneCh := make(chan struct{})
go func() {
defer close(doneCh)
if opts.mask {
f, ok := i.Reader.(*os.File)
if !ok {
resultErr = fmt.Errorf("reader must be a file")
return
}
i.mask, i.maskVal = opts.mask, opts.maskVal
resultStr, resultErr = i.rawRead(f)
} else {
line, err := i.bReader.ReadString('\n')
if err != nil && err != io.EOF {
resultErr = fmt.Errorf("failed to read the input: %s", err)
}
resultStr = strings.TrimSuffix(line, LineSep)
// brute force for the moment
resultStr = strings.TrimSuffix(line, "\n")
}
}()
select {
case <-sigCh:
return "", ErrInterrupted
case <-doneCh:
return resultStr, resultErr
}
}
// rawReadline tries to return a single line, not including the end-of-line
// bytes with raw Mode (without prompting nothing). Or if provided show some
// value instead of actual value.
func (i *UI) rawReadline(f *os.File) (string, error) {
var resultBuf []byte
for {
var buf [1]byte
n, err := f.Read(buf[:])
if err != nil && err != io.EOF {
return "", err
}
if n == 0 || buf[0] == '\n' || buf[0] == '\r' {
break
}
if buf[0] == 3 {
return "", ErrInterrupted
}
if i.mask {
fmt.Fprintf(i.Writer, i.maskVal)
}
resultBuf = append(resultBuf, buf[0])
}
fmt.Fprintf(i.Writer, "\n")
return string(resultBuf), nil
}
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