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Runtime error
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'use strict';
const isTerm = process.env.TERM_PROGRAM === 'Apple_Terminal';
const colors = require('ansi-colors');
const utils = require('./utils');
const ansi = module.exports = exports;
const ESC = '\u001b[';
const BEL = '\u0007';
let hidden = false;
const code = ansi.code = {
bell: BEL,
beep: BEL,
beginning: `${ESC}G`,
down: `${ESC}J`,
esc: ESC,
getPosition: `${ESC}6n`,
hide: `${ESC}?25l`,
line: `${ESC}2K`,
lineEnd: `${ESC}K`,
lineStart: `${ESC}1K`,
restorePosition: ESC + (isTerm ? '8' : 'u'),
savePosition: ESC + (isTerm ? '7' : 's'),
screen: `${ESC}2J`,
show: `${ESC}?25h`,
up: `${ESC}1J`
};
const cursor = ansi.cursor = {
get hidden() {
return hidden;
},
hide() {
hidden = true;
return code.hide;
},
show() {
hidden = false;
return code.show;
},
forward: (count = 1) => `${ESC}${count}C`,
backward: (count = 1) => `${ESC}${count}D`,
nextLine: (count = 1) => `${ESC}E`.repeat(count),
prevLine: (count = 1) => `${ESC}F`.repeat(count),
up: (count = 1) => count ? `${ESC}${count}A` : '',
down: (count = 1) => count ? `${ESC}${count}B` : '',
right: (count = 1) => count ? `${ESC}${count}C` : '',
left: (count = 1) => count ? `${ESC}${count}D` : '',
to(x, y) {
return y ? `${ESC}${y + 1};${x + 1}H` : `${ESC}${x + 1}G`;
},
move(x = 0, y = 0) {
let res = '';
res += (x < 0) ? cursor.left(-x) : (x > 0) ? cursor.right(x) : '';
res += (y < 0) ? cursor.up(-y) : (y > 0) ? cursor.down(y) : '';
return res;
},
restore(state = {}) {
let { after, cursor, initial, input, prompt, size, value } = state;
initial = utils.isPrimitive(initial) ? String(initial) : '';
input = utils.isPrimitive(input) ? String(input) : '';
value = utils.isPrimitive(value) ? String(value) : '';
if (size) {
let codes = ansi.cursor.up(size) + ansi.cursor.to(prompt.length);
let diff = input.length - cursor;
if (diff > 0) {
codes += ansi.cursor.left(diff);
}
return codes;
}
if (value || after) {
let pos = (!input && !!initial) ? -initial.length : -input.length + cursor;
if (after) pos -= after.length;
if (input === '' && initial && !prompt.includes(initial)) {
pos += initial.length;
}
return ansi.cursor.move(pos);
}
}
};
const erase = ansi.erase = {
screen: code.screen,
up: code.up,
down: code.down,
line: code.line,
lineEnd: code.lineEnd,
lineStart: code.lineStart,
lines(n) {
let str = '';
for (let i = 0; i < n; i++) {
str += ansi.erase.line + (i < n - 1 ? ansi.cursor.up(1) : '');
}
if (n) str += ansi.code.beginning;
return str;
}
};
ansi.clear = (input = '', columns = process.stdout.columns) => {
if (!columns) return erase.line + cursor.to(0);
let width = str => [...colors.unstyle(str)].length;
let lines = input.split(/\r?\n/);
let rows = 0;
for (let line of lines) {
rows += 1 + Math.floor(Math.max(width(line) - 1, 0) / columns);
}
return (erase.line + cursor.prevLine()).repeat(rows - 1) + erase.line + cursor.to(0);
};
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