'use strict'; var utils = require('../utils/'); var util = require('./readline'); // Prevent crashes on environments where the width can't be properly detected utils.cliWidth.defaultWidth = 80; var ScreenManager = module.exports = function(rl) { // These variables are keeping information to allow correct prompt re-rendering this.height = 0; this.extraLinesUnderPrompt = 0; this.rl = rl; }; ScreenManager.prototype.render = function(content, opt) { opt = utils.extend({ cursor: 0 }, opt || {}); var cursorPos = this.rl._getCursorPos(); this.rl.output.unmute(); this.clean(this.extraLinesUnderPrompt); /** * Write message to screen and setPrompt to control backspace */ var lines = content.split(/\n/); var promptLine = lines[lines.length - 1 - opt.cursor]; var rawPromptLine = utils.stripColor(promptLine); // Remove the rl.line from our prompt. We can't rely on the content of // rl.line (mainly because of the password prompt), so just rely on it's // length. var prompt = promptLine; if (this.rl.line.length) { prompt = prompt.slice(0, -this.rl.line.length); } this.rl.setPrompt(prompt); var rawPrompt = utils.stripColor(prompt); // Manually insert an extra line if we're at the end of the line. // This prevent the cursor from appearing at the beginning of the // current line. var breakedLines = breakLines(lines); var actualLines = utils.flatten(breakedLines); if (rawPromptLine.length % utils.cliWidth() === 0) { actualLines.push(''); } this.rl.output.write(actualLines.join('\n')); /** * Re-adjust the cursor at the correct position. */ var promptLineUpDiff = Math.floor(rawPromptLine.length / utils.cliWidth()) - cursorPos.rows; if (opt.cursor + promptLineUpDiff > 0) { util.up(this.rl, opt.cursor + promptLineUpDiff); } // Reset cursor at the beginning of the line var last = actualLines[actualLines.length - 1]; util.left(this.rl, utils.stripColor(last).length); // Adjust cursor on the right var rightPos = cursorPos.cols; if (cursorPos.rows === 0) { rightPos = Math.max(rightPos, rawPrompt.length); } util.right(this.rl, rightPos); /** * Set up state for next re-rendering */ var bottomSection = breakedLines.slice(breakedLines.length - opt.cursor - promptLineUpDiff); this.extraLinesUnderPrompt = utils.flatten(bottomSection).length; this.height = actualLines.length; this.rl.output.mute(); }; ScreenManager.prototype.clean = function(extraLines) { if (extraLines > 0) { util.down(this.rl, extraLines); } util.clearLine(this.rl, this.height); }; ScreenManager.prototype.done = function() { this.rl.setPrompt(''); this.rl.output.unmute(); this.rl.output.write('\n'); }; function breakLines(lines) { // Break lines who're longuer than the cli width so we can normalize the natural line // returns behavior accross terminals. var width = utils.cliWidth(); var regex = new RegExp( '(?:(?:\\033\[[0-9;]*m)*.?){1,' + width + '}', 'g' ); return lines.map(function(line) { var chunk = line.match(regex); // last match is always empty chunk.pop(); return chunk || ''; }); }