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File size: 3,558 Bytes
1070765 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | const _readline = require('readline');
// low-level terminal interactions
class Terminal{
constructor(outputStream){
this.stream = outputStream;
// default: line wrapping enabled
this.linewrap = true;
// current, relative y position
this.dy = 0;
}
// save cursor position + settings
cursorSave(){
if (!this.stream.isTTY){
return;
}
// save position
this.stream.write('\x1B7');
}
// restore last cursor position + settings
cursorRestore(){
if (!this.stream.isTTY){
return;
}
// restore cursor
this.stream.write('\x1B8');
}
// show/hide cursor
cursor(enabled){
if (!this.stream.isTTY){
return;
}
if (enabled){
this.stream.write('\x1B[?25h');
}else{
this.stream.write('\x1B[?25l');
}
}
// change cursor positionn
cursorTo(x=null, y=null){
if (!this.stream.isTTY){
return;
}
// move cursor absolute
_readline.cursorTo(this.stream, x, y);
}
// change relative cursor position
cursorRelative(dx=null, dy=null){
if (!this.stream.isTTY){
return;
}
// store current position
this.dy = this.dy + dy;
// move cursor relative
_readline.moveCursor(this.stream, dx, dy);
}
// relative reset
cursorRelativeReset(){
if (!this.stream.isTTY){
return;
}
// move cursor to initial line
_readline.moveCursor(this.stream, 0, -this.dy);
// first char
_readline.cursorTo(this.stream, 0, null);
// reset counter
this.dy = 0;
}
// clear to the right from cursor
clearRight(){
if (!this.stream.isTTY){
return;
}
_readline.clearLine(this.stream, 1);
}
// clear the full line
clearLine(){
if (!this.stream.isTTY){
return;
}
_readline.clearLine(this.stream, 0);
}
// clear everyting beyond the current line
clearBottom(){
if (!this.stream.isTTY){
return;
}
_readline.clearScreenDown(this.stream);
}
// add new line; increment counter
newline(){
this.stream.write('\n');
this.dy++;
}
// write content to output stream
// @TODO use string-width to strip length
write(s, rawWrite=false){
// line wrapping enabled ? trim output
// this is just a fallback mechanism in case user enabled line-wrapping via options or set it to auto
if (this.linewrap === true && rawWrite === false){
this.stream.write(s.substr(0, this.getWidth()));
// standard behaviour with disabled linewrapping
}else{
this.stream.write(s);
}
}
// control line wrapping
lineWrapping(enabled){
if (!this.stream.isTTY){
return;
}
// store state
this.linewrap = enabled;
if (enabled){
this.stream.write('\x1B[?7h');
}else{
this.stream.write('\x1B[?7l');
}
}
// tty environment ?
isTTY(){
return (this.stream.isTTY === true);
}
// get terminal width
getWidth(){
// set max width to 80 in tty-mode and 200 in notty-mode
return this.stream.columns || (this.stream.isTTY ? 80 : 200);
}
}
module.exports = Terminal;
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