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davidtheclark/bs.js

Created November 11, 2015 03:19
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  1. davidtheclark created this gist Nov 11, 2015.
    57 changes: 57 additions & 0 deletions bs.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,57 @@
    'use strict';

    var fs = require('graceful-fs');
    var Promise = require('pinkie-promise');
    var yaml = require('js-yaml');
    var parseJson = require('parse-json');
    var requireFromString = require('require-from-string');

    module.exports = function(configPath, configFormat) {
    return new Promise(function(resolve) {
    fs.readFile(configPath, 'utf8', function(err, content) {
    if (err) throw err;

    var parsedConfig = (function() {
    switch (configFormat) {
    case 'json':
    return parseJson(content);
    case 'yaml':
    return yaml.safeLoad(content);
    case 'js':
    return requireFromString(content);
    default:
    return tryAllParsing(content);
    }
    })();

    if (!parsedConfig) {
    throw new Error(
    'Failed to parse "' + configPath + '" as JSON, JS, or YAML.'
    );
    }

    resolve({
    config: parsedConfig,
    filepath: configPath,
    });
    });
    });
    };

    function tryAllParsing(content) {
    return tryParsing(content, parseJson, function() {
    return tryParsing(content, yaml.safeLoad, function() {
    return tryParsing(content, requireFromString, function() {
    return null;
    });
    });
    });
    }

    function tryParsing(content, parser, cb) {
    try {
    return parser(content);
    } catch (e) {
    return cb();
    }
    }