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