short-name aliasing

Add support for short-name aliasing.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

vendor/github.com/lunixbochs/vtclean/io.go

@@ -0,0 +1,93 @@
+package vtclean
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+)
+
+type reader struct {
+	io.Reader
+	scanner *bufio.Scanner
+	buf     []byte
+
+	color bool
+}
+
+func NewReader(r io.Reader, color bool) io.Reader {
+	return &reader{Reader: r, color: color}
+}
+
+func (r *reader) scan() bool {
+	if r.scanner == nil {
+		r.scanner = bufio.NewScanner(r.Reader)
+	}
+	if len(r.buf) > 0 {
+		return true
+	}
+	if r.scanner.Scan() {
+		r.buf = []byte(Clean(r.scanner.Text(), r.color) + "\n")
+		return true
+	}
+	return false
+}
+
+func (r *reader) fill(p []byte) int {
+	n := len(r.buf)
+	copy(p, r.buf)
+	if len(p) < len(r.buf) {
+		r.buf = r.buf[len(p):]
+		n = len(p)
+	} else {
+		r.buf = nil
+	}
+	return n
+}
+
+func (r *reader) Read(p []byte) (int, error) {
+	n := r.fill(p)
+	if n < len(p) {
+		if !r.scan() {
+			if n == 0 {
+				return 0, io.EOF
+			}
+			return n, nil
+		}
+		n += r.fill(p[n:])
+	}
+	return n, nil
+}
+
+type writer struct {
+	io.Writer
+	buf   []byte
+	color bool
+}
+
+func NewWriter(w io.Writer, color bool) io.WriteCloser {
+	return &writer{Writer: w, color: color}
+}
+
+func (w *writer) Write(p []byte) (int, error) {
+	buf := append(w.buf, p...)
+	lines := bytes.Split(buf, []byte("\n"))
+	if len(lines) > 0 {
+		last := len(lines) - 1
+		w.buf = lines[last]
+		count := 0
+		for _, line := range lines[:last] {
+			n, err := w.Writer.Write([]byte(Clean(string(line), w.color) + "\n"))
+			count += n
+			if err != nil {
+				return count, err
+			}
+		}
+	}
+	return len(p), nil
+}
+
+func (w *writer) Close() error {
+	cl := Clean(string(w.buf), w.color)
+	_, err := w.Writer.Write([]byte(cl))
+	return err
+}