Update vendor/

vendor/github.com/emersion/go-textwrapper/wrapper.go

@@ -0,0 +1,61 @@
+// A writer that wraps long text lines to a specified length.
+package textwrapper
+
+import (
+	"io"
+)
+
+type writer struct {
+	Sep string
+	Len int
+
+	w io.Writer
+	i int
+}
+
+func (w *writer) Write(b []byte) (N int, err error) {
+	to := w.Len - w.i
+
+	for len(b) > to {
+		var n int
+		n, err = w.w.Write(b[:to])
+		if err != nil {
+			return
+		}
+		N += n
+		b = b[to:]
+
+		_, err = w.w.Write([]byte(w.Sep))
+		if err != nil {
+			return
+		}
+
+		w.i = 0
+		to = w.Len
+	}
+
+	w.i += len(b)
+
+	n, err := w.w.Write(b)
+	if err != nil {
+		return
+	}
+	N += n
+
+	return
+}
+
+// Returns a writer that splits its input into multiple parts that have the same
+// length and adds a separator between these parts.
+func New(w io.Writer, sep string, l int) io.Writer {
+	return &writer{
+		Sep: sep,
+		Len: l,
+		w: w,
+	}
+}
+
+// Creates a RFC822 text wrapper. It adds a CRLF (ie. \r\n) each 76 characters.
+func NewRFC822(w io.Writer) io.Writer {
+	return New(w, "\r\n", 76)
+}