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A simple config utility for nodejs

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<!doctype html> <html lang="en"> <head> <title>Code coverage report for index.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="prettify.css" /> <link rel="stylesheet" href="base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="index.html">All files</a> index.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">86.15% </span> <span class="quiet">Statements</span> <span class='fraction'>56/65</span> </div> <div class='fl pad1y space-right2'> <span class="strong">76.79% </span> <span class="quiet">Branches</span> <span class='fraction'>43/56</span> </div> <div class='fl pad1y space-right2'> <span class="strong">93.33% </span> <span class="quiet">Functions</span> <span class='fraction'>14/15</span> </div> <div class='fl pad1y 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cline-yes">6x</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">'use strict'; &nbsp; import fs from 'fs'; import path from 'path'; &nbsp; import { get as lodashGet, set as lodashSet } from 'lodash'; &nbsp; import { weakToJSON, guessUpcast } from './utils'; &nbsp; class Cz { constructor(options) { this._config = new WeakMap(); this._defaults = new WeakMap(); this._path = null; this._options = new WeakMap(); &nbsp; if (options) { <span class="missing-if-branch" title="else path not taken" >E</span>if ('upcast' in options) { this._options.upcast = options.upcast; } } } &nbsp; get(prop) { const wholeObj = Object.assign(weakToJSON(this._defaults), weakToJSON(this._config)); if (arguments.length === 0) { return wholeObj; } return lodashGet(wholeObj, prop.replace(':', '.')); } &nbsp; set(prop, value) { // Handles if prop is key or obj if (value === undefined) { for (const key of Object.keys(prop)) { <span class="missing-if-branch" title="if path not taken" >I</span>if ('upcast' in this._options &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >this._options.upcast === true)</span> { <span class="cstat-no" title="statement not covered" > lodashSet(this._config, key, guessUpcast(prop[key]));</span> } else { lodashSet(this._config, key, prop[key]); } } } else if ('upcast' in this._options &amp;&amp; this._options.upcast === true) { lodashSet(this._config, prop.replace(':', '.'), guessUpcast(value)); } else { lodashSet(this._config, prop.replace(':', '.'), value); } } &nbsp; defaults(obj) { this._defaults = obj; } &nbsp; load(newPath) { const file = fs.readFileSync(newPath, 'utf-8'); this._path = newPath; // We use 2 as an empty file with a new line would return 1 if (file.length &gt;= 2) { const data = JSON.parse(file); for (const prop of Object.keys(data)) { this._config[prop] = data[prop]; } } } &nbsp; save(newPath) { if (arguments.length === 0 &amp;&amp; this._path === null) { throw new Error('No path provided.'); } else { fs.writeFileSync(path.normalize(newPath || this._path), JSON.stringify(this._config, null, 4) + '\n', 'utf8'); } } &nbsp; args(options = {}) { const args = process.argv.filter(arg =&gt; { return arg.startsWith('--') &amp;&amp; arg.includes('='); }); args.forEach(arg =&gt; { arg = arg.slice(2).split('='); // Gets us ['db:host', 'localhost'] from '--db:host=localhost' <span class="missing-if-branch" title="if path not taken" >I</span>if ('upcast' in options &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >options.upcast === true)</span> { <span class="cstat-no" title="statement not covered" > this.set(arg[0], guessUpcast(arg[1]));</span> } else { this.set(arg[0], arg[1]); } }); } &nbsp; env(options = <span class="branch-0 cbranch-no" title="branch not covered" >{})</span> { let envs = {}; <span class="missing-if-branch" title="if path not taken" >I</span>if (options.caseInsensative) { <span class="cstat-no" title="statement not covered" > Object.keys(process.env).forEach(<span class="fstat-no" title="function not covered" >ke</span>y =&gt; {</span> <span class="cstat-no" title="statement not covered" > if (process.env[key.toLowerCase()]) {</span> <span class="cstat-no" title="statement not covered" > if (process.env[key.toLowerCase()] === process.env[key]) {</span> <span class="cstat-no" title="statement not covered" > envs[key.toLowerCase()] = process.env[key];</span> } else { <span class="cstat-no" title="statement not covered" > envs[key] = process.env[key];</span> } } else { <span class="cstat-no" title="statement not covered" > envs[key.toLowerCase()] = process.env[key];</span> } }); } else { envs = process.env; } Object.keys(envs).forEach(key =&gt; { if (options.allowed) { key = key.replace(options.seperator || '__', ':'); if (options.allowed.includes(key.split(':')[0])) { if ('upcast' in options &amp;&amp; options.upcast === true) { this.set(key, guessUpcast(envs[key])); } else { this.set(key, envs[key]); } } } else { key = key.replace(options.seperator || '__', ':'); <span class="missing-if-branch" title="if path not taken" >I</span>if ('upcast' in options &amp;&amp; <span class="branch-1 cbranch-no" title="branch not covered" >options.upcast === true)</span> { <span class="cstat-no" title="statement not covered" > this.set(key, guessUpcast(envs[key]));</span> } else { this.set(key, envs[key]); } } }); } &nbsp; joinGets(gets, joins) { // @TODO: Add support for a single join param instead of just array const results = gets.map(get =&gt; { return this.get(get); }); let finalResult = ''; for (let i = 0; i &lt; gets.length; i++) { finalResult += results[i]; if (i + 1 !== gets.length) { finalResult += joins[i]; } } return finalResult; } &nbsp; reset() { this._config = new WeakMap(); } } &nbsp; export default Cz; &nbsp;</pre></td></tr> </table></pre> <div class='push'></div><!-- for sticky footer --> </div><!-- /wrapper --> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Sat Apr 15 2017 16:54:21 GMT+0930 (ACST) </div> </div> <script src="prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="sorter.js"></script> </body> </html>