feat: improved deploy progress reporting

See toolshed/abra#478

vendor/github.com/mattn/go-localereader/localereader_windows.go

@@ -0,0 +1,85 @@
+// +build windows
+
+package localereader
+
+import (
+	"io"
+	"syscall"
+	"unicode/utf8"
+	"unsafe"
+
+	"golang.org/x/text/transform"
+)
+
+const (
+	CP_ACP               = 0
+	MB_ERR_INVALID_CHARS = 8
+)
+
+var (
+	modkernel32             = syscall.NewLazyDLL("kernel32.dll")
+	procMultiByteToWideChar = modkernel32.NewProc("MultiByteToWideChar")
+	procIsDBCSLeadByte      = modkernel32.NewProc("IsDBCSLeadByte")
+)
+
+type codepageDecoder struct {
+	transform.NopResetter
+
+	cp int
+}
+
+func (codepageDecoder) Transform(dst, src []byte, atEOF bool) (nDst, nSrc int, err error) {
+	r, size := rune(0), 0
+loop:
+	for ; nSrc < len(src); nSrc += size {
+		switch c0 := src[nSrc]; {
+		case c0 < utf8.RuneSelf:
+			r, size = rune(c0), 1
+
+		default:
+			br, _, _ := procIsDBCSLeadByte.Call(uintptr(src[nSrc]))
+			if br == 0 {
+				r = rune(src[nSrc])
+				size = 1
+				break
+			}
+			if nSrc >= len(src)-1 {
+				r = rune(src[nSrc])
+				size = 1
+				break
+			}
+			n, _, _ := procMultiByteToWideChar.Call(CP_ACP, 0, uintptr(unsafe.Pointer(&src[nSrc])), uintptr(2), uintptr(0), 0)
+			if n <= 0 {
+				err = syscall.GetLastError()
+				break
+			}
+			var us [1]uint16
+			rc, _, _ := procMultiByteToWideChar.Call(CP_ACP, 0, uintptr(unsafe.Pointer(&src[nSrc])), uintptr(2), uintptr(unsafe.Pointer(&us[0])), 1)
+			if rc == 0 {
+				size = 1
+				break
+			}
+			r = rune(us[0])
+			size = 2
+		}
+		if nDst+utf8.RuneLen(r) > len(dst) {
+			err = transform.ErrShortDst
+			break loop
+		}
+		nDst += utf8.EncodeRune(dst[nDst:], r)
+	}
+	return nDst, nSrc, err
+
+}
+
+func newReader(r io.Reader) io.Reader {
+	return transform.NewReader(r, NewAcpDecoder())
+}
+
+func NewCodePageDecoder(cp int) transform.Transformer {
+	return &codepageDecoder{cp: cp}
+}
+
+func NewAcpDecoder() transform.Transformer {
+	return &codepageDecoder{cp: CP_ACP}
+}