mirror of https://github.com/chzyer/readline.git
265 lines
5.6 KiB
Go
265 lines
5.6 KiB
Go
// +build windows
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package readline
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import (
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"bufio"
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"io"
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"strconv"
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"strings"
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"sync"
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"unicode/utf8"
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"unsafe"
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)
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const (
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_ = uint16(0)
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COLOR_FBLUE = 0x0001
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COLOR_FGREEN = 0x0002
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COLOR_FRED = 0x0004
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COLOR_FINTENSITY = 0x0008
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COLOR_BBLUE = 0x0010
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COLOR_BGREEN = 0x0020
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COLOR_BRED = 0x0040
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COLOR_BINTENSITY = 0x0080
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COMMON_LVB_UNDERSCORE = 0x8000
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COMMON_LVB_BOLD = 0x0007
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)
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var ColorTableFg = []word{
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0, // 30: Black
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COLOR_FRED, // 31: Red
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COLOR_FGREEN, // 32: Green
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COLOR_FRED | COLOR_FGREEN, // 33: Yellow
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COLOR_FBLUE, // 34: Blue
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COLOR_FRED | COLOR_FBLUE, // 35: Magenta
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COLOR_FGREEN | COLOR_FBLUE, // 36: Cyan
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COLOR_FRED | COLOR_FBLUE | COLOR_FGREEN, // 37: White
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}
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var ColorTableBg = []word{
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0, // 40: Black
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COLOR_BRED, // 41: Red
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COLOR_BGREEN, // 42: Green
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COLOR_BRED | COLOR_BGREEN, // 43: Yellow
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COLOR_BBLUE, // 44: Blue
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COLOR_BRED | COLOR_BBLUE, // 45: Magenta
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COLOR_BGREEN | COLOR_BBLUE, // 46: Cyan
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COLOR_BRED | COLOR_BBLUE | COLOR_BGREEN, // 47: White
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}
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type ANSIWriter struct {
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target io.Writer
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wg sync.WaitGroup
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ctx *ANSIWriterCtx
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sync.Mutex
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}
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func NewANSIWriter(w io.Writer) *ANSIWriter {
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a := &ANSIWriter{
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target: w,
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ctx: NewANSIWriterCtx(w),
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}
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return a
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}
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func (a *ANSIWriter) Close() error {
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a.wg.Wait()
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return nil
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}
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type ANSIWriterCtx struct {
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isEsc bool
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isEscSeq bool
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arg []string
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target *bufio.Writer
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wantFlush bool
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defaultAttributes word
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}
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func getTextAttributes() word {
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sbi, err := GetConsoleScreenBufferInfo()
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if err != nil {
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// Hopefully sane default
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return ColorTableFg[7] | ColorTableBg[0]
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}
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return sbi.wAttributes
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}
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func NewANSIWriterCtx(target io.Writer) *ANSIWriterCtx {
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return &ANSIWriterCtx{
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target: bufio.NewWriter(target),
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defaultAttributes: getTextAttributes(),
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}
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}
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func (a *ANSIWriterCtx) Flush() {
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a.target.Flush()
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}
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func (a *ANSIWriterCtx) process(r rune) bool {
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if a.wantFlush {
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if r == 0 || r == CharEsc {
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a.wantFlush = false
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a.target.Flush()
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}
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}
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if a.isEscSeq {
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a.isEscSeq = a.ioloopEscSeq(a.target, r, &a.arg)
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return true
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}
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switch r {
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case CharEsc:
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a.isEsc = true
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case '[':
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if a.isEsc {
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a.arg = nil
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a.isEscSeq = true
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a.isEsc = false
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break
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}
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fallthrough
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default:
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a.target.WriteRune(r)
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a.wantFlush = true
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}
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return true
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}
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func (a *ANSIWriterCtx) ioloopEscSeq(w *bufio.Writer, r rune, argptr *[]string) bool {
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arg := *argptr
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var err error
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if r >= 'A' && r <= 'D' {
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count := short(GetInt(arg, 1))
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info, err := GetConsoleScreenBufferInfo()
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if err != nil {
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return false
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}
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switch r {
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case 'A': // up
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info.dwCursorPosition.y -= count
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case 'B': // down
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info.dwCursorPosition.y += count
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case 'C': // right
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info.dwCursorPosition.x += count
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case 'D': // left
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info.dwCursorPosition.x -= count
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}
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SetConsoleCursorPosition(&info.dwCursorPosition)
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return false
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}
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switch r {
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case 'J':
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killLines()
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case 'K':
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eraseLine()
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case 'm':
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color := getTextAttributes()
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for _, item := range arg {
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var c int
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c, err = strconv.Atoi(item)
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if err != nil {
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w.WriteString("[" + strings.Join(arg, ";") + "m")
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break
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}
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if c >= 30 && c < 38 {
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color &= ^word(COLOR_FRED | COLOR_FGREEN | COLOR_FBLUE | COLOR_FINTENSITY)
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color ^= COLOR_FINTENSITY
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color |= ColorTableFg[c-30]
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} else if c >= 40 && c < 48 {
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color &= ^word(COLOR_BRED | COLOR_BGREEN | COLOR_BBLUE | COLOR_BINTENSITY)
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color ^= COLOR_BINTENSITY
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color |= ColorTableBg[c-40]
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} else if c == 4 {
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color &= ^word(COLOR_FRED | COLOR_FGREEN | COLOR_FBLUE | COLOR_FINTENSITY)
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color |= COMMON_LVB_UNDERSCORE | ColorTableFg[7]
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} else if c == 1 {
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color |= COMMON_LVB_BOLD | COLOR_FINTENSITY
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} else { // unknown code treat as reset
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color = ColorTableFg[7]
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}
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}
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if err != nil {
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break
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}
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kernel.SetConsoleTextAttribute(stdout, uintptr(color))
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case '\007': // set title
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case ';':
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if len(arg) == 0 || arg[len(arg)-1] != "" {
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arg = append(arg, "")
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*argptr = arg
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}
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return true
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default:
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if len(arg) == 0 {
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arg = append(arg, "")
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}
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arg[len(arg)-1] += string(r)
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*argptr = arg
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return true
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}
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*argptr = nil
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return false
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}
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func (a *ANSIWriter) Write(b []byte) (int, error) {
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a.Lock()
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defer a.Unlock()
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off := 0
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for len(b) > off {
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r, size := utf8.DecodeRune(b[off:])
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if size == 0 {
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return off, io.ErrShortWrite
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}
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off += size
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a.ctx.process(r)
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}
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a.ctx.Flush()
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return off, nil
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}
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func killLines() error {
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sbi, err := GetConsoleScreenBufferInfo()
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if err != nil {
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return err
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}
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size := (sbi.dwCursorPosition.y - sbi.dwSize.y) * sbi.dwSize.x
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size += sbi.dwCursorPosition.x
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var written int
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kernel.FillConsoleOutputAttribute(stdout, uintptr(sbi.wAttributes),
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uintptr(size),
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sbi.dwCursorPosition.ptr(),
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uintptr(unsafe.Pointer(&written)),
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)
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return kernel.FillConsoleOutputCharacterW(stdout, uintptr(' '),
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uintptr(size),
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sbi.dwCursorPosition.ptr(),
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uintptr(unsafe.Pointer(&written)),
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)
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}
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func eraseLine() error {
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sbi, err := GetConsoleScreenBufferInfo()
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if err != nil {
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return err
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}
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size := sbi.dwSize.x
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sbi.dwCursorPosition.x = 0
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var written int
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return kernel.FillConsoleOutputCharacterW(stdout, uintptr(' '),
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uintptr(size),
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sbi.dwCursorPosition.ptr(),
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uintptr(unsafe.Pointer(&written)),
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)
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}
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