Delete ncurses implementation

src/tui/ncurses.go

-// +build ncurses
-// +build !windows
-// +build !tcell
-
-package tui
-
-/*
-#include <ncurses.h>
-#include <locale.h>
-#cgo !static LDFLAGS: -lncurses
-#cgo static LDFLAGS: -l:libncursesw.a -l:libtinfo.a -l:libgpm.a -ldl
-#cgo android static LDFLAGS: -l:libncurses.a -fPIE -march=armv7-a -mfpu=neon -mhard-float -Wl,--no-warn-mismatch
-
-FILE* c_tty() {
-	return fopen("/dev/tty", "r");
-}
-
-SCREEN* c_newterm(FILE* tty) {
-	return newterm(NULL, stderr, tty);
-}
-
-int c_getcurx(WINDOW* win) {
-	return getcurx(win);
-}
-*/
-import "C"
-
-import (
-	"os"
-	"strconv"
-	"strings"
-	"time"
-	"unicode/utf8"
-)
-
-func HasFullscreenRenderer() bool {
-	return true
-}
-
-type Attr C.uint
-
-type CursesWindow struct {
-	impl   *C.WINDOW
-	top    int
-	left   int
-	width  int
-	height int
-}
-
-func (w *CursesWindow) Top() int {
-	return w.top
-}
-
-func (w *CursesWindow) Left() int {
-	return w.left
-}
-
-func (w *CursesWindow) Width() int {
-	return w.width
-}
-
-func (w *CursesWindow) Height() int {
-	return w.height
-}
-
-func (w *CursesWindow) Refresh() {
-	C.wnoutrefresh(w.impl)
-}
-
-func (w *CursesWindow) FinishFill() {
-	// NO-OP
-}
-
-const (
-	Bold      Attr = C.A_BOLD
-	Dim            = C.A_DIM
-	Blink          = C.A_BLINK
-	Reverse        = C.A_REVERSE
-	Underline      = C.A_UNDERLINE
-)
-
-var Italic Attr = C.A_VERTICAL << 1 // FIXME
-
-const (
-	AttrRegular Attr = 0
-)
-
-var (
-	_screen   *C.SCREEN
-	_colorMap map[int]int16
-	_colorFn  func(ColorPair, Attr) (C.short, C.int)
-)
-
-func init() {
-	_colorMap = make(map[int]int16)
-	if strings.HasPrefix(C.GoString(C.curses_version()), "ncurses 5") {
-		Italic = C.A_NORMAL
-	}
-}
-
-func (a Attr) Merge(b Attr) Attr {
-	return a | b
-}
-
-func (r *FullscreenRenderer) defaultTheme() *ColorTheme {
-	if C.tigetnum(C.CString("colors")) >= 256 {
-		return Dark256
-	}
-	return Default16
-}
-
-func (r *FullscreenRenderer) Init() {
-	C.setlocale(C.LC_ALL, C.CString(""))
-	tty := C.c_tty()
-	if tty == nil {
-		errorExit("Failed to open /dev/tty")
-	}
-	_screen = C.c_newterm(tty)
-	if _screen == nil {
-		errorExit("Invalid $TERM: " + os.Getenv("TERM"))
-	}
-	C.set_term(_screen)
-	if r.mouse {
-		C.mousemask(C.ALL_MOUSE_EVENTS, nil)
-		C.mouseinterval(0)
-	}
-	C.noecho()
-	C.raw() // stty dsusp undef
-	C.nonl()
-	C.keypad(C.stdscr, true)
-
-	delay := 50
-	delayEnv := os.Getenv("ESCDELAY")
-	if len(delayEnv) > 0 {
-		num, err := strconv.Atoi(delayEnv)
-		if err == nil && num >= 0 {
-			delay = num
-		}
-	}
-	C.set_escdelay(C.int(delay))
-
-	if r.theme != nil {
-		C.start_color()
-		initTheme(r.theme, r.defaultTheme(), r.forceBlack)
-		initPairs(r.theme)
-		C.bkgd(C.chtype(C.COLOR_PAIR(C.int(ColNormal.index()))))
-		_colorFn = attrColored
-	} else {
-		initTheme(r.theme, nil, r.forceBlack)
-		_colorFn = attrMono
-	}
-
-	C.nodelay(C.stdscr, true)
-	ch := C.getch()
-	if ch != C.ERR {
-		C.ungetch(ch)
-	}
-	C.nodelay(C.stdscr, false)
-}
-
-func initPairs(theme *ColorTheme) {
-	C.assume_default_colors(C.int(theme.Fg), C.int(theme.Bg))
-	for _, pair := range []ColorPair{
-		ColNormal,
-		ColPrompt,
-		ColMatch,
-		ColCurrent,
-		ColCurrentMatch,
-		ColSpinner,
-		ColInfo,
-		ColCursor,
-		ColSelected,
-		ColHeader,
-		ColBorder} {
-		C.init_pair(C.short(pair.index()), C.short(pair.Fg()), C.short(pair.Bg()))
-	}
-}
-
-func (r *FullscreenRenderer) Pause(bool) {
-	C.endwin()
-}
-
-func (r *FullscreenRenderer) Resume(bool) {
-}
-
-func (r *FullscreenRenderer) Close() {
-	C.endwin()
-	C.delscreen(_screen)
-}
-
-func (r *FullscreenRenderer) NewWindow(top int, left int, width int, height int, borderStyle BorderStyle) Window {
-	win := C.newwin(C.int(height), C.int(width), C.int(top), C.int(left))
-	if r.theme != nil {
-		C.wbkgd(win, C.chtype(C.COLOR_PAIR(C.int(ColNormal.index()))))
-	}
-	// FIXME Does not implement BorderHorizontal
-	if borderStyle != BorderNone {
-		pair, attr := _colorFn(ColBorder, 0)
-		C.wcolor_set(win, pair, nil)
-		C.wattron(win, attr)
-		C.box(win, 0, 0)
-		C.wattroff(win, attr)
-		C.wcolor_set(win, 0, nil)
-	}
-
-	return &CursesWindow{
-		impl:   win,
-		top:    top,
-		left:   left,
-		width:  width,
-		height: height,
-	}
-}
-
-func attrColored(color ColorPair, a Attr) (C.short, C.int) {
-	return C.short(color.index()), C.int(a)
-}
-
-func attrMono(color ColorPair, a Attr) (C.short, C.int) {
-	return 0, C.int(attrFor(color, a))
-}
-
-func (r *FullscreenRenderer) MaxX() int {
-	return int(C.COLS)
-}
-
-func (r *FullscreenRenderer) MaxY() int {
-	return int(C.LINES)
-}
-
-func (w *CursesWindow) Close() {
-	C.delwin(w.impl)
-}
-
-func (w *CursesWindow) Enclose(y int, x int) bool {
-	return bool(C.wenclose(w.impl, C.int(y), C.int(x)))
-}
-
-func (w *CursesWindow) Move(y int, x int) {
-	C.wmove(w.impl, C.int(y), C.int(x))
-}
-
-func (w *CursesWindow) MoveAndClear(y int, x int) {
-	w.Move(y, x)
-	C.wclrtoeol(w.impl)
-}
-
-func (w *CursesWindow) Print(text string) {
-	C.waddstr(w.impl, C.CString(strings.Map(func(r rune) rune {
-		if r < 32 {
-			return -1
-		}
-		return r
-	}, text)))
-}
-
-func (w *CursesWindow) CPrint(color ColorPair, attr Attr, text string) {
-	p, a := _colorFn(color, attr)
-	C.wcolor_set(w.impl, p, nil)
-	C.wattron(w.impl, a)
-	w.Print(text)
-	C.wattroff(w.impl, a)
-	C.wcolor_set(w.impl, 0, nil)
-}
-
-func (r *FullscreenRenderer) Clear() {
-	C.clear()
-	C.endwin()
-}
-
-func (r *FullscreenRenderer) Refresh() {
-	C.refresh()
-}
-
-func (w *CursesWindow) Erase() {
-	C.werase(w.impl)
-}
-
-func (w *CursesWindow) X() int {
-	return int(C.c_getcurx(w.impl))
-}
-
-func (r *FullscreenRenderer) DoesAutoWrap() bool {
-	return true
-}
-
-func (r *FullscreenRenderer) IsOptimized() bool {
-	return true
-}
-
-func (w *CursesWindow) Fill(str string) FillReturn {
-	if C.waddstr(w.impl, C.CString(str)) == C.OK {
-		return FillContinue
-	}
-	return FillSuspend
-}
-
-func (w *CursesWindow) CFill(fg Color, bg Color, attr Attr, str string) FillReturn {
-	index := ColorPair{fg, bg, -1}.index()
-	C.wcolor_set(w.impl, C.short(index), nil)
-	C.wattron(w.impl, C.int(attr))
-	ret := w.Fill(str)
-	C.wattroff(w.impl, C.int(attr))
-	C.wcolor_set(w.impl, 0, nil)
-	return ret
-}
-
-func (r *FullscreenRenderer) RefreshWindows(windows []Window) {
-	for _, w := range windows {
-		w.Refresh()
-	}
-	C.doupdate()
-}
-
-func (p ColorPair) index() int16 {
-	if p.id >= 0 {
-		return p.id
-	}
-
-	// ncurses does not support 24-bit colors
-	if p.is24() {
-		return ColDefault.index()
-	}
-
-	key := p.key()
-	if found, prs := _colorMap[key]; prs {
-		return found
-	}
-
-	id := int16(len(_colorMap)) + ColUser.id
-	C.init_pair(C.short(id), C.short(p.Fg()), C.short(p.Bg()))
-	_colorMap[key] = id
-	return id
-}
-
-func consume(expects ...rune) bool {
-	for _, r := range expects {
-		if int(C.getch()) != int(r) {
-			return false
-		}
-	}
-	return true
-}
-
-func escSequence() Event {
-	C.nodelay(C.stdscr, true)
-	defer func() {
-		C.nodelay(C.stdscr, false)
-	}()
-	c := C.getch()
-	switch c {
-	case C.ERR:
-		return Event{ESC, 0, nil}
-	case CtrlM:
-		return Event{CtrlAltM, 0, nil}
-	case '/':
-		return Event{AltSlash, 0, nil}
-	case ' ':
-		return Event{AltSpace, 0, nil}
-	case 127, C.KEY_BACKSPACE:
-		return Event{AltBS, 0, nil}
-	case '[':
-		// Bracketed paste mode (printf "\e[?2004h")
-		// \e[200~ TEXT \e[201~
-		if consume('2', '0', '0', '~') {
-			return Event{Invalid, 0, nil}
-		}
-	}
-	if c >= 'a' && c <= 'z' {
-		return Event{AltA + int(c) - 'a', 0, nil}
-	}
-
-	if c >= '0' && c <= '9' {
-		return Event{Alt0 + int(c) - '0', 0, nil}
-	}
-
-	// Don't care. Ignore the rest.
-	for ; c != C.ERR; c = C.getch() {
-	}
-	return Event{Invalid, 0, nil}
-}
-
-func (r *FullscreenRenderer) GetChar() Event {
-	c := C.getch()
-	switch c {
-	case C.ERR:
-		// Unexpected error from blocking read
-		r.Close()
-		errorExit("Failed to read /dev/tty")
-	case C.KEY_UP:
-		return Event{Up, 0, nil}
-	case C.KEY_DOWN:
-		return Event{Down, 0, nil}
-	case C.KEY_LEFT:
-		return Event{Left, 0, nil}
-	case C.KEY_RIGHT:
-		return Event{Right, 0, nil}
-	case C.KEY_HOME:
-		return Event{Home, 0, nil}
-	case C.KEY_END:
-		return Event{End, 0, nil}
-	case C.KEY_BACKSPACE:
-		return Event{BSpace, 0, nil}
-	case C.KEY_F0 + 1:
-		return Event{F1, 0, nil}
-	case C.KEY_F0 + 2:
-		return Event{F2, 0, nil}
-	case C.KEY_F0 + 3:
-		return Event{F3, 0, nil}
-	case C.KEY_F0 + 4:
-		return Event{F4, 0, nil}
-	case C.KEY_F0 + 5:
-		return Event{F5, 0, nil}
-	case C.KEY_F0 + 6:
-		return Event{F6, 0, nil}
-	case C.KEY_F0 + 7:
-		return Event{F7, 0, nil}
-	case C.KEY_F0 + 8:
-		return Event{F8, 0, nil}
-	case C.KEY_F0 + 9:
-		return Event{F9, 0, nil}
-	case C.KEY_F0 + 10:
-		return Event{F10, 0, nil}
-	case C.KEY_F0 + 11:
-		return Event{F11, 0, nil}
-	case C.KEY_F0 + 12:
-		return Event{F12, 0, nil}
-	case C.KEY_DC:
-		return Event{Del, 0, nil}
-	case C.KEY_PPAGE:
-		return Event{PgUp, 0, nil}
-	case C.KEY_NPAGE:
-		return Event{PgDn, 0, nil}
-	case C.KEY_BTAB:
-		return Event{BTab, 0, nil}
-	case C.KEY_ENTER:
-		return Event{CtrlM, 0, nil}
-	case C.KEY_SLEFT:
-		return Event{SLeft, 0, nil}
-	case C.KEY_SRIGHT:
-		return Event{SRight, 0, nil}
-	case C.KEY_MOUSE:
-		var me C.MEVENT
-		if C.getmouse(&me) != C.ERR {
-			mod := ((me.bstate & C.BUTTON_SHIFT) | (me.bstate & C.BUTTON_CTRL) | (me.bstate & C.BUTTON_ALT)) > 0
-			x := int(me.x)
-			y := int(me.y)
-			/* Cannot use BUTTON1_DOUBLE_CLICKED due to mouseinterval(0) */
-			if (me.bstate & C.BUTTON1_PRESSED) > 0 {
-				now := time.Now()
-				if now.Sub(r.prevDownTime) < doubleClickDuration {
-					r.clickY = append(r.clickY, y)
-				} else {
-					r.clickY = []int{y}
-					r.prevDownTime = now
-				}
-				return Event{Mouse, 0, &MouseEvent{y, x, 0, true, false, mod}}
-			} else if (me.bstate & C.BUTTON1_RELEASED) > 0 {
-				double := false
-				if len(r.clickY) > 1 && r.clickY[0] == r.clickY[1] &&
-					time.Now().Sub(r.prevDownTime) < doubleClickDuration {
-					double = true
-				}
-				return Event{Mouse, 0, &MouseEvent{y, x, 0, false, double, mod}}
-			} else if (me.bstate&0x8000000) > 0 || (me.bstate&0x80) > 0 {
-				return Event{Mouse, 0, &MouseEvent{y, x, -1, false, false, mod}}
-			} else if (me.bstate & C.BUTTON4_PRESSED) > 0 {
-				return Event{Mouse, 0, &MouseEvent{y, x, 1, false, false, mod}}
-			}
-		}
-		return Event{Invalid, 0, nil}
-	case C.KEY_RESIZE:
-		return Event{Resize, 0, nil}
-	case ESC:
-		return escSequence()
-	case 127:
-		return Event{BSpace, 0, nil}
-	case 0:
-		return Event{CtrlSpace, 0, nil}
-	}
-	// CTRL-A ~ CTRL-Z
-	if c >= CtrlA && c <= CtrlZ {
-		return Event{int(c), 0, nil}
-	}
-
-	// Multi-byte character
-	buffer := []byte{byte(c)}
-	for {
-		r, _ := utf8.DecodeRune(buffer)
-		if r != utf8.RuneError {
-			return Event{Rune, r, nil}
-		}
-
-		c := C.getch()
-		if c == C.ERR {
-			break
-		}
-		if c >= C.KEY_CODE_YES {
-			C.ungetch(c)
-			break
-		}
-		buffer = append(buffer, byte(c))
-	}
-	return Event{Invalid, 0, nil}
-}