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'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;
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