Make height option work under Windows (#1341)

Separate Unix & Windows code into platform specific files for light renderer

src/tui/light.go

@@ -7,7 +7,6 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
-	"syscall"
 	"time"
 	"unicode/utf8"
 
@@ -30,21 +29,6 @@ const consoleDevice string = "/dev/tty"
 
 var offsetRegexp *regexp.Regexp = regexp.MustCompile("(.*)\x1b\\[([0-9]+);([0-9]+)R")
 
-func openTtyIn() *os.File {
-	in, err := os.OpenFile(consoleDevice, syscall.O_RDONLY, 0)
-	if err != nil {
-		tty := ttyname()
-		if len(tty) > 0 {
-			if in, err := os.OpenFile(tty, syscall.O_RDONLY, 0); err == nil {
-				return in
-			}
-		}
-		fmt.Fprintln(os.Stderr, "Failed to open "+consoleDevice)
-		os.Exit(2)
-	}
-	return in
-}
-
 func (r *LightRenderer) stderr(str string) {
 	r.stderrInternal(str, true)
 }
@@ -101,6 +85,13 @@ type LightRenderer struct {
 	y             int
 	x             int
 	maxHeightFunc func(int) int
+
+	// Windows only
+	ttyinChannel    chan byte
+	inHandle        uintptr
+	outHandle       uintptr
+	origStateInput  uint32
+	origStateOutput uint32
 }
 
 type LightWindow struct {
@@ -134,10 +125,6 @@ func NewLightRenderer(theme *ColorTheme, forceBlack bool, mouse bool, tabstop in
 	return &r
 }
 
-func (r *LightRenderer) fd() int {
-	return int(r.ttyin.Fd())
-}
-
 func (r *LightRenderer) defaultTheme() *ColorTheme {
 	if strings.Contains(os.Getenv("TERM"), "256") {
 		return Dark256
@@ -149,22 +136,6 @@ func (r *LightRenderer) defaultTheme() *ColorTheme {
 	return Default16
 }
 
-func (r *LightRenderer) findOffset() (row int, col int) {
-	r.csi("6n")
-	r.flush()
-	bytes := []byte{}
-	for tries := 0; tries < offsetPollTries; tries++ {
-		bytes = r.getBytesInternal(bytes, tries > 0)
-		offsets := offsetRegexp.FindSubmatch(bytes)
-		if len(offsets) > 3 {
-			// add anything we skipped over to the input buffer
-			r.buffer = append(r.buffer, offsets[1]...)
-			return atoi(string(offsets[2]), 0) - 1, atoi(string(offsets[3]), 0) - 1
-		}
-	}
-	return -1, -1
-}
-
 func repeat(r rune, times int) string {
 	if times > 0 {
 		return strings.Repeat(string(r), times)
@@ -183,13 +154,9 @@ func atoi(s string, defaultValue int) int {
 func (r *LightRenderer) Init() {
 	r.escDelay = atoi(os.Getenv("ESCDELAY"), defaultEscDelay)
 
-	fd := r.fd()
-	origState, err := terminal.GetState(fd)
-	if err != nil {
+	if err := r.initPlatform(); err != nil {
 		errorExit(err.Error())
 	}
-	r.origState = origState
-	terminal.MakeRaw(fd)
 	r.updateTerminalSize()
 	initTheme(r.theme, r.defaultTheme(), r.forceBlack)
 
@@ -262,28 +229,6 @@ func getEnv(name string, defaultValue int) int {
 	return atoi(env, defaultValue)
 }
 
-func (r *LightRenderer) updateTerminalSize() {
-	width, height, err := terminal.GetSize(r.fd())
-	if err == nil {
-		r.width = width
-		r.height = r.maxHeightFunc(height)
-	} else {
-		r.width = getEnv("COLUMNS", defaultWidth)
-		r.height = r.maxHeightFunc(getEnv("LINES", defaultHeight))
-	}
-}
-
-func (r *LightRenderer) getch(nonblock bool) (int, bool) {
-	b := make([]byte, 1)
-	fd := r.fd()
-	util.SetNonblock(r.ttyin, nonblock)
-	_, err := util.Read(fd, b)
-	if err != nil {
-		return 0, false
-	}
-	return int(b[0]), true
-}
-
 func (r *LightRenderer) getBytes() []byte {
 	return r.getBytesInternal(r.buffer, false)
 }
@@ -604,7 +549,7 @@ func (r *LightRenderer) rmcup() {
 }
 
 func (r *LightRenderer) Pause(clear bool) {
-	terminal.Restore(r.fd(), r.origState)
+	r.restoreTerminal()
 	if clear {
 		if r.fullscreen {
 			r.rmcup()
@@ -617,7 +562,7 @@ func (r *LightRenderer) Pause(clear bool) {
 }
 
 func (r *LightRenderer) Resume(clear bool) {
-	terminal.MakeRaw(r.fd())
+	r.setupTerminal()
 	if clear {
 		if r.fullscreen {
 			r.smcup()
@@ -671,7 +616,8 @@ func (r *LightRenderer) Close() {
 		r.csi("?1000l")
 	}
 	r.flush()
-	terminal.Restore(r.fd(), r.origState)
+	r.closePlatform()
+	r.restoreTerminal()
 }
 
 func (r *LightRenderer) MaxX() int {