85 lines
1.8 KiB
JavaScript
85 lines
1.8 KiB
JavaScript
'use strict';
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const ansiEscapes = require('ansi-escapes');
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const cliCursor = require('cli-cursor');
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const wrapAnsi = require('wrap-ansi');
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const sliceAnsi = require('slice-ansi');
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const defaultTerminalHeight = 24;
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const getWidth = stream => {
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const {columns} = stream;
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if (!columns) {
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return 80;
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}
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return columns;
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};
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const fitToTerminalHeight = (stream, text) => {
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const terminalHeight = stream.rows || defaultTerminalHeight;
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const lines = text.split('\n');
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const toRemove = lines.length - terminalHeight;
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if (toRemove <= 0) {
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return text;
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}
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return sliceAnsi(
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text,
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lines.slice(0, toRemove).join('\n').length + 1,
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text.length);
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};
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const main = (stream, {showCursor = false} = {}) => {
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let previousLineCount = 0;
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let previousWidth = getWidth(stream);
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let previousOutput = '';
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const render = (...args) => {
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if (!showCursor) {
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cliCursor.hide();
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}
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let output = args.join(' ') + '\n';
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output = fitToTerminalHeight(stream, output);
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const width = getWidth(stream);
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if (output === previousOutput && previousWidth === width) {
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return;
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}
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previousOutput = output;
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previousWidth = width;
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output = wrapAnsi(output, width, {
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trim: false,
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hard: true,
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wordWrap: false
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});
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stream.write(ansiEscapes.eraseLines(previousLineCount) + output);
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previousLineCount = output.split('\n').length;
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};
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render.clear = () => {
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stream.write(ansiEscapes.eraseLines(previousLineCount));
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previousOutput = '';
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previousWidth = getWidth(stream);
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previousLineCount = 0;
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};
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render.done = () => {
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previousOutput = '';
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previousWidth = getWidth(stream);
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previousLineCount = 0;
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if (!showCursor) {
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cliCursor.show();
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}
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};
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return render;
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};
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module.exports = main(process.stdout);
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module.exports.stderr = main(process.stderr);
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module.exports.create = main;
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