1//
 2// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
 3//
 4// Permission to use, copy, modify, and distribute this software for any
 5// purpose with or without fee is hereby granted, provided that the above
 6// copyright notice and this permission notice appear in all copies.
 7//
 8// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 9// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15
16package main
17
18/*
19#include <termios.h>
20*/
21import "C"
22import (
23	"fmt"
24	"io/ioutil"
25	"log"
26	"os"
27)
28
29func adminscreen() {
30	log.SetOutput(ioutil.Discard)
31	stdout := os.Stdout
32	esc := "\x1b"
33	smcup := esc + "[?1049h"
34	rmcup := esc + "[?1049l"
35
36	hidecursor := func() {
37	}
38	showcursor := func() {
39	}
40	movecursor := func(x, y int) {
41		stdout.WriteString(fmt.Sprintf(esc+"[%d;%dH", x, y))
42	}
43	clearscreen := func() {
44		stdout.WriteString(esc + "[2J")
45	}
46
47	savedtio := new(C.struct_termios)
48	C.tcgetattr(1, savedtio)
49	restore := func() {
50		stdout.WriteString(rmcup)
51		showcursor()
52		C.tcsetattr(1, C.TCSAFLUSH, savedtio)
53	}
54	defer restore()
55
56	init := func() {
57		tio := new(C.struct_termios)
58		C.tcgetattr(1, tio)
59		tio.c_lflag = tio.c_lflag & ^C.uint(C.ECHO|C.ICANON)
60		C.tcsetattr(1, C.TCSADRAIN, tio)
61
62		hidecursor()
63		stdout.WriteString(smcup)
64		clearscreen()
65		movecursor(1, 1)
66	}
67
68	init()
69
70	for {
71		var buf [1]byte
72		os.Stdin.Read(buf[:])
73		c := buf[0]
74		switch c {
75		case 'q':
76			return
77		default:
78			os.Stdout.Write(buf[:])
79		}
80	}
81}