render-engine/terminal.go at main · ByteHunter/render-engine · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
package main

import (
	"fmt"
	"os"
	"os/exec"
	"strconv"
	"strings"
)

var TCONF_RAW = []string{
	"-F", "/dev/tty", "-icanon", "-echo",
	"min", "0", "time", "0",
	"-isig", "-ixon",
}

var TCONF_NORMAL = []string{
	"-F", "/dev/tty", "icanon", "echo",
}

type Terminal struct {
	width, height int
	size          Vector2d
}

func NewTerminal() *Terminal {
	return &Terminal{}
}

// GLOBAL METHODS

func CommandOutput(name string, arg ...string) string {
	cmd := exec.Command(name, arg...)
	cmd.Stdin = os.Stdin
	out, err := cmd.Output()
	if err != nil {
		panic(err)
	}

	return string(out)
}

func GetTerminalSize() (int, int) {
	output := CommandOutput("stty", "size")
	output = strings.TrimSpace(output)
	size := strings.Split(output, " ")
	rows, _ := strconv.Atoi(size[0])
	cols, _ := strconv.Atoi(size[1])

	return cols, rows
}

func ReadRaw() []byte {
	var b []byte = make([]byte, 4096)
	os.Stdin.Sync()
	n, err := os.Stdin.Read(b)
	if err != nil {
		return []byte{}
	}
	return b[:n]
}

// SETTINGS

func (t *Terminal) CursorVisibility(b bool) {
	if b {
		fmt.Print(CURSOR_SHOW)
	} else {
		fmt.Print(CURSOR_HIDE)
	}
}

func (t *Terminal) LineWrap(b bool) {
	if b {
		fmt.Print(LINE_WRAP)
	} else {
		fmt.Print(NO_LINE_WRAP)
	}
}

// CONFIGURE

func (t *Terminal) init() {
	width, height := GetTerminalSize()
	t.width, t.height = width, height
	t.size = Vector2d{width, height}
}

func (t *Terminal) configure() {
	exec.Command("stty", TCONF_RAW...).Run()
	t.CursorVisibility(false)
}

func (t *Terminal) restore() {
	exec.Command("stty", TCONF_NORMAL...).Run()
	t.CursorVisibility(true)
}

// PRIMITIVES

func (t *Terminal) color(r, g, b int) string {
	return NUMS[r] + SEP + NUMS[g] + SEP + NUMS[b]
}

func (t *Terminal) foreground(r, g, b int) string {
	return FOREGROUND + t.color(r, g, b) + SEP + "m"
}

func (t *Terminal) background(r, g, b int) string {
	return BACKGROUND + t.color(r, g, b) + SEP + "m"
}

func (t *Terminal) reset() string {
	return RESET
}

func (t *Terminal) pos(x, y int) string {
	return CSI + NUMS[y] + SEP + NUMS[x] + "H"
}

func (t *Terminal) pos2d(p Vector2d) string {
	return CSI + NUMS[p.y] + SEP + NUMS[p.x] + "H"
}

func (t *Terminal) cursorUp(n int) string {
	return CSI + NUMS[n] + "A"
}

func (t *Terminal) cursorDown(n int) string {
	return CSI + NUMS[n] + "B"
}

func (t *Terminal) cursorForward(n int) string {
	return CSI + NUMS[n] + "C"
}

func (t *Terminal) cursorBackward(n int) string {
	return CSI + NUMS[n] + "D"
}