515 lines
11 KiB
Go
515 lines
11 KiB
Go
// +build !windows
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package termbox
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import "unicode/utf8"
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import "bytes"
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import "syscall"
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import "unsafe"
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import "strings"
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import "strconv"
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import "os"
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import "io"
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// private API
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const (
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t_enter_ca = iota
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t_exit_ca
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t_show_cursor
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t_hide_cursor
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t_clear_screen
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t_sgr0
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t_underline
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t_bold
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t_blink
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t_reverse
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t_enter_keypad
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t_exit_keypad
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t_enter_mouse
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t_exit_mouse
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t_max_funcs
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)
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const (
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coord_invalid = -2
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attr_invalid = Attribute(0xFFFF)
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)
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type input_event struct {
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data []byte
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err error
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}
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var (
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// term specific sequences
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keys []string
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funcs []string
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// termbox inner state
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orig_tios syscall_Termios
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back_buffer cellbuf
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front_buffer cellbuf
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termw int
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termh int
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input_mode = InputEsc
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output_mode = OutputNormal
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out *os.File
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in int
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lastfg = attr_invalid
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lastbg = attr_invalid
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lastx = coord_invalid
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lasty = coord_invalid
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cursor_x = cursor_hidden
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cursor_y = cursor_hidden
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foreground = ColorDefault
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background = ColorDefault
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inbuf = make([]byte, 0, 64)
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outbuf bytes.Buffer
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sigwinch = make(chan os.Signal, 1)
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sigio = make(chan os.Signal, 1)
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quit = make(chan int)
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input_comm = make(chan input_event)
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interrupt_comm = make(chan struct{})
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intbuf = make([]byte, 0, 16)
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// grayscale indexes
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grayscale = []Attribute{
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0, 17, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244,
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245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256, 232,
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}
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)
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func write_cursor(x, y int) {
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outbuf.WriteString("\033[")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(y+1), 10))
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outbuf.WriteString(";")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(x+1), 10))
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outbuf.WriteString("H")
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}
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func write_sgr_fg(a Attribute) {
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switch output_mode {
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case Output256, Output216, OutputGrayscale:
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outbuf.WriteString("\033[38;5;")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
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outbuf.WriteString("m")
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default:
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outbuf.WriteString("\033[3")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
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outbuf.WriteString("m")
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}
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}
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func write_sgr_bg(a Attribute) {
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switch output_mode {
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case Output256, Output216, OutputGrayscale:
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outbuf.WriteString("\033[48;5;")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
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outbuf.WriteString("m")
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default:
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outbuf.WriteString("\033[4")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(a-1), 10))
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outbuf.WriteString("m")
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}
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}
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func write_sgr(fg, bg Attribute) {
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switch output_mode {
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case Output256, Output216, OutputGrayscale:
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outbuf.WriteString("\033[38;5;")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(fg-1), 10))
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outbuf.WriteString("m")
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outbuf.WriteString("\033[48;5;")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(bg-1), 10))
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outbuf.WriteString("m")
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default:
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outbuf.WriteString("\033[3")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(fg-1), 10))
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outbuf.WriteString(";4")
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outbuf.Write(strconv.AppendUint(intbuf, uint64(bg-1), 10))
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outbuf.WriteString("m")
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}
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}
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type winsize struct {
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rows uint16
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cols uint16
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xpixels uint16
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ypixels uint16
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}
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func get_term_size(fd uintptr) (int, int) {
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var sz winsize
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_, _, _ = syscall.Syscall(syscall.SYS_IOCTL,
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fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&sz)))
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return int(sz.cols), int(sz.rows)
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}
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func send_attr(fg, bg Attribute) {
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if fg == lastfg && bg == lastbg {
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return
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}
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outbuf.WriteString(funcs[t_sgr0])
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var fgcol, bgcol Attribute
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switch output_mode {
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case Output256:
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fgcol = fg & 0x1FF
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bgcol = bg & 0x1FF
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case Output216:
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fgcol = fg & 0xFF
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bgcol = bg & 0xFF
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if fgcol > 216 {
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fgcol = ColorDefault
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}
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if bgcol > 216 {
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bgcol = ColorDefault
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}
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if fgcol != ColorDefault {
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fgcol += 0x10
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}
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if bgcol != ColorDefault {
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bgcol += 0x10
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}
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case OutputGrayscale:
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fgcol = fg & 0x1F
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bgcol = bg & 0x1F
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if fgcol > 26 {
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fgcol = ColorDefault
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}
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if bgcol > 26 {
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bgcol = ColorDefault
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}
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if fgcol != ColorDefault {
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fgcol = grayscale[fgcol]
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}
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if bgcol != ColorDefault {
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bgcol = grayscale[bgcol]
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}
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default:
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fgcol = fg & 0x0F
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bgcol = bg & 0x0F
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}
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if fgcol != ColorDefault {
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if bgcol != ColorDefault {
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write_sgr(fgcol, bgcol)
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} else {
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write_sgr_fg(fgcol)
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}
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} else if bgcol != ColorDefault {
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write_sgr_bg(bgcol)
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}
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if fg&AttrBold != 0 {
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outbuf.WriteString(funcs[t_bold])
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}
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if bg&AttrBold != 0 {
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outbuf.WriteString(funcs[t_blink])
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}
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if fg&AttrUnderline != 0 {
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outbuf.WriteString(funcs[t_underline])
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}
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if fg&AttrReverse|bg&AttrReverse != 0 {
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outbuf.WriteString(funcs[t_reverse])
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}
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lastfg, lastbg = fg, bg
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}
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func send_char(x, y int, ch rune) {
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var buf [8]byte
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n := utf8.EncodeRune(buf[:], ch)
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if x-1 != lastx || y != lasty {
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write_cursor(x, y)
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}
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lastx, lasty = x, y
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outbuf.Write(buf[:n])
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}
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func flush() error {
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_, err := io.Copy(out, &outbuf)
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outbuf.Reset()
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if err != nil {
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return err
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}
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return nil
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}
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func send_clear() error {
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send_attr(foreground, background)
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outbuf.WriteString(funcs[t_clear_screen])
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if !is_cursor_hidden(cursor_x, cursor_y) {
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write_cursor(cursor_x, cursor_y)
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}
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// we need to invalidate cursor position too and these two vars are
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// used only for simple cursor positioning optimization, cursor
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// actually may be in the correct place, but we simply discard
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// optimization once and it gives us simple solution for the case when
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// cursor moved
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lastx = coord_invalid
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lasty = coord_invalid
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return flush()
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}
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func update_size_maybe() error {
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w, h := get_term_size(out.Fd())
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if w != termw || h != termh {
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termw, termh = w, h
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back_buffer.resize(termw, termh)
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front_buffer.resize(termw, termh)
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front_buffer.clear()
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return send_clear()
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}
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return nil
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}
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func tcsetattr(fd uintptr, termios *syscall_Termios) error {
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r, _, e := syscall.Syscall(syscall.SYS_IOCTL,
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fd, uintptr(syscall_TCSETS), uintptr(unsafe.Pointer(termios)))
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if r != 0 {
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return os.NewSyscallError("SYS_IOCTL", e)
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}
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return nil
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}
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func tcgetattr(fd uintptr, termios *syscall_Termios) error {
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r, _, e := syscall.Syscall(syscall.SYS_IOCTL,
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fd, uintptr(syscall_TCGETS), uintptr(unsafe.Pointer(termios)))
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if r != 0 {
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return os.NewSyscallError("SYS_IOCTL", e)
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}
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return nil
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}
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func parse_mouse_event(event *Event, buf string) (int, bool) {
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if strings.HasPrefix(buf, "\033[M") && len(buf) >= 6 {
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// X10 mouse encoding, the simplest one
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// \033 [ M Cb Cx Cy
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b := buf[3] - 32
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switch b & 3 {
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case 0:
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if b&64 != 0 {
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event.Key = MouseWheelUp
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} else {
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event.Key = MouseLeft
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}
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case 1:
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if b&64 != 0 {
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event.Key = MouseWheelDown
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} else {
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event.Key = MouseMiddle
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}
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case 2:
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event.Key = MouseRight
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case 3:
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event.Key = MouseRelease
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default:
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return 6, false
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}
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event.Type = EventMouse // KeyEvent by default
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if b&32 != 0 {
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event.Mod |= ModMotion
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}
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// the coord is 1,1 for upper left
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event.MouseX = int(buf[4]) - 1 - 32
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event.MouseY = int(buf[5]) - 1 - 32
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return 6, true
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} else if strings.HasPrefix(buf, "\033[<") || strings.HasPrefix(buf, "\033[") {
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// xterm 1006 extended mode or urxvt 1015 extended mode
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// xterm: \033 [ < Cb ; Cx ; Cy (M or m)
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// urxvt: \033 [ Cb ; Cx ; Cy M
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// find the first M or m, that's where we stop
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mi := strings.IndexAny(buf, "Mm")
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if mi == -1 {
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return 0, false
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}
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// whether it's a capital M or not
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isM := buf[mi] == 'M'
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// whether it's urxvt or not
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isU := false
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// buf[2] is safe here, because having M or m found means we have at
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// least 3 bytes in a string
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if buf[2] == '<' {
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buf = buf[3:mi]
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} else {
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isU = true
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buf = buf[2:mi]
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}
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s1 := strings.Index(buf, ";")
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s2 := strings.LastIndex(buf, ";")
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// not found or only one ';'
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if s1 == -1 || s2 == -1 || s1 == s2 {
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return 0, false
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}
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n1, err := strconv.ParseInt(buf[0:s1], 10, 64)
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if err != nil {
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return 0, false
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}
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n2, err := strconv.ParseInt(buf[s1+1:s2], 10, 64)
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if err != nil {
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return 0, false
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}
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n3, err := strconv.ParseInt(buf[s2+1:], 10, 64)
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if err != nil {
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return 0, false
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}
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// on urxvt, first number is encoded exactly as in X10, but we need to
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// make it zero-based, on xterm it is zero-based already
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if isU {
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n1 -= 32
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}
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switch n1 & 3 {
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case 0:
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if n1&64 != 0 {
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event.Key = MouseWheelUp
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} else {
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event.Key = MouseLeft
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}
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case 1:
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if n1&64 != 0 {
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event.Key = MouseWheelDown
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} else {
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event.Key = MouseMiddle
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}
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case 2:
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event.Key = MouseRight
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case 3:
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event.Key = MouseRelease
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default:
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return mi + 1, false
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}
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if !isM {
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// on xterm mouse release is signaled by lowercase m
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event.Key = MouseRelease
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}
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event.Type = EventMouse // KeyEvent by default
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if n1&32 != 0 {
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event.Mod |= ModMotion
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}
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event.MouseX = int(n2) - 1
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event.MouseY = int(n3) - 1
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return mi + 1, true
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}
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return 0, false
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}
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func parse_escape_sequence(event *Event, buf []byte) (int, bool) {
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bufstr := string(buf)
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for i, key := range keys {
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if strings.HasPrefix(bufstr, key) {
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event.Ch = 0
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event.Key = Key(0xFFFF - i)
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return len(key), true
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}
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}
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// if none of the keys match, let's try mouse seqences
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return parse_mouse_event(event, bufstr)
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}
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func extract_raw_event(data []byte, event *Event) bool {
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if len(inbuf) == 0 {
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return false
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}
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n := len(data)
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if n == 0 {
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return false
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}
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n = copy(data, inbuf)
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copy(inbuf, inbuf[n:])
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inbuf = inbuf[:len(inbuf)-n]
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event.N = n
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event.Type = EventRaw
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return true
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}
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func extract_event(inbuf []byte, event *Event) bool {
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if len(inbuf) == 0 {
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event.N = 0
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return false
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}
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if inbuf[0] == '\033' {
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// possible escape sequence
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if n, ok := parse_escape_sequence(event, inbuf); n != 0 {
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event.N = n
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return ok
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}
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// it's not escape sequence, then it's Alt or Esc, check input_mode
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switch {
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case input_mode&InputEsc != 0:
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// if we're in escape mode, fill Esc event, pop buffer, return success
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event.Ch = 0
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event.Key = KeyEsc
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event.Mod = 0
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event.N = 1
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return true
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case input_mode&InputAlt != 0:
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// if we're in alt mode, set Alt modifier to event and redo parsing
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event.Mod = ModAlt
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ok := extract_event(inbuf[1:], event)
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if ok {
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event.N++
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} else {
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event.N = 0
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}
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return ok
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default:
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panic("unreachable")
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}
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}
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// if we're here, this is not an escape sequence and not an alt sequence
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// so, it's a FUNCTIONAL KEY or a UNICODE character
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// first of all check if it's a functional key
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if Key(inbuf[0]) <= KeySpace || Key(inbuf[0]) == KeyBackspace2 {
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// fill event, pop buffer, return success
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event.Ch = 0
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event.Key = Key(inbuf[0])
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event.N = 1
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return true
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}
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// the only possible option is utf8 rune
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if r, n := utf8.DecodeRune(inbuf); r != utf8.RuneError {
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event.Ch = r
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event.Key = 0
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event.N = n
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return true
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}
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return false
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}
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func fcntl(fd int, cmd int, arg int) (val int, err error) {
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r, _, e := syscall.Syscall(syscall.SYS_FCNTL, uintptr(fd), uintptr(cmd),
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uintptr(arg))
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val = int(r)
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if e != 0 {
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err = e
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}
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return
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}
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