odin-javascript-exercises/node_modules/inquirer/lib/utils/screen-manager.js
2017-12-15 12:56:14 -06:00

135 lines
3.7 KiB
JavaScript

'use strict';
var _ = require('lodash');
var util = require('./readline');
var cliWidth = require('cli-width');
var stripAnsi = require('strip-ansi');
var stringWidth = require('string-width');
function height(content) {
return content.split('\n').length;
}
function lastLine(content) {
return _.last(content.split('\n'));
}
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, bottomContent) {
this.rl.output.unmute();
this.clean(this.extraLinesUnderPrompt);
/**
* Write message to screen and setPrompt to control backspace
*/
var promptLine = lastLine(content);
var rawPromptLine = stripAnsi(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 = rawPromptLine;
if (this.rl.line.length) {
prompt = prompt.slice(0, -this.rl.line.length);
}
this.rl.setPrompt(prompt);
// setPrompt will change cursor position, now we can get correct value
var cursorPos = this.rl._getCursorPos();
var width = this.normalizedCliWidth();
content = forceLineReturn(content, width);
if (bottomContent) {
bottomContent = forceLineReturn(bottomContent, width);
}
// 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.
if (rawPromptLine.length % width === 0) {
content += '\n';
}
var fullContent = content + (bottomContent ? '\n' + bottomContent : '');
this.rl.output.write(fullContent);
/**
* Re-adjust the cursor at the correct position.
*/
// We need to consider parts of the prompt under the cursor as part of the bottom
// content in order to correctly cleanup and re-render.
var promptLineUpDiff = Math.floor(rawPromptLine.length / width) - cursorPos.rows;
var bottomContentHeight = promptLineUpDiff + (bottomContent ? height(bottomContent) : 0);
if (bottomContentHeight > 0) {
util.up(this.rl, bottomContentHeight);
}
// Reset cursor at the beginning of the line
util.left(this.rl, stringWidth(lastLine(fullContent)));
// Adjust cursor on the right
util.right(this.rl, cursorPos.cols);
/**
* Set up state for next re-rendering
*/
this.extraLinesUnderPrompt = bottomContentHeight;
this.height = height(fullContent);
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');
};
ScreenManager.prototype.releaseCursor = function () {
if (this.extraLinesUnderPrompt > 0) {
util.down(this.rl, this.extraLinesUnderPrompt);
}
};
ScreenManager.prototype.normalizedCliWidth = function () {
var width = cliWidth({
defaultWidth: 80,
output: this.rl.output
});
if (process.platform === 'win32') {
return width - 1;
}
return width;
};
function breakLines(lines, width) {
// Break lines who're longuer than the cli width so we can normalize the natural line
// returns behavior accross terminals.
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 || '';
});
}
function forceLineReturn(content, width) {
return _.flatten(breakLines(content.split('\n'), width)).join('\n');
}