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