config.js
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'use strict';
var FS = require('fs');
var yaml = require('js-yaml');
var EXTEND = require('whet.extend');
/**
* Read and/or extend/replace default config file,
* prepare and optimize plugins array.
*
* @param {Object} [config] input config
* @return {Object} output config
*/
module.exports = function(config) {
var defaults;
config = typeof config == 'object' && config || {};
if (config.plugins && !Array.isArray(config.plugins)) {
return { error: 'Error: Invalid plugins list. Provided \'plugins\' in config should be an array.' };
}
if (config.full) {
defaults = config;
if (Array.isArray(defaults.plugins)) {
defaults.plugins = preparePluginsArray(defaults.plugins);
}
} else {
defaults = EXTEND({}, yaml.safeLoad(FS.readFileSync(__dirname + '/../../.svgo.yml', 'utf8')));
defaults.plugins = preparePluginsArray(defaults.plugins);
defaults = extendConfig(defaults, config);
}
if ('floatPrecision' in config && Array.isArray(defaults.plugins)) {
defaults.plugins.forEach(function(plugin) {
if (plugin.params && ('floatPrecision' in plugin.params)) {
// Don't touch default plugin params
plugin.params = EXTEND({}, plugin.params, { floatPrecision: config.floatPrecision });
}
});
}
if (Array.isArray(defaults.plugins)) {
defaults.plugins = optimizePluginsArray(defaults.plugins);
}
return defaults;
};
/**
* Require() all plugins in array.
*
* @param {Array} plugins input plugins array
* @return {Array} input plugins array of arrays
*/
function preparePluginsArray(plugins) {
var plugin,
key;
return plugins.map(function(item) {
// {}
if (typeof item === 'object') {
key = Object.keys(item)[0];
// custom
if (typeof item[key] === 'object' && item[key].fn && typeof item[key].fn === 'function') {
plugin = setupCustomPlugin(key, item[key]);
} else {
plugin = EXTEND({}, require('../../plugins/' + key));
// name: {}
if (typeof item[key] === 'object') {
plugin.params = EXTEND({}, plugin.params || {}, item[key]);
plugin.active = true;
// name: false
} else if (item[key] === false) {
plugin.active = false;
// name: true
} else if (item[key] === true) {
plugin.active = true;
}
plugin.name = key;
}
// name
} else {
plugin = EXTEND({}, require('../../plugins/' + item));
plugin.name = item;
}
return plugin;
});
}
/**
* Extend plugins with the custom config object.
*
* @param {Array} plugins input plugins
* @param {Object} config config
* @return {Array} output plugins
*/
function extendConfig(defaults, config) {
var key;
// plugins
if (config.plugins) {
config.plugins.forEach(function(item) {
// {}
if (typeof item === 'object') {
key = Object.keys(item)[0];
// custom
if (typeof item[key] === 'object' && item[key].fn && typeof item[key].fn === 'function') {
defaults.plugins.push(setupCustomPlugin(key, item[key]));
} else {
defaults.plugins.forEach(function(plugin) {
if (plugin.name === key) {
// name: {}
if (typeof item[key] === 'object') {
plugin.params = EXTEND({}, plugin.params || {}, item[key]);
plugin.active = true;
// name: false
} else if (item[key] === false) {
plugin.active = false;
// name: true
} else if (item[key] === true) {
plugin.active = true;
}
}
});
}
}
});
}
defaults.multipass = config.multipass;
// svg2js
if (config.svg2js) {
defaults.svg2js = config.svg2js;
}
// js2svg
if (config.js2svg) {
defaults.js2svg = config.js2svg;
}
return defaults;
}
/**
* Setup and enable a custom plugin
*
* @param {String} plugin name
* @param {Object} custom plugin
* @return {Array} enabled plugin
*/
function setupCustomPlugin(name, plugin) {
plugin.active = true;
plugin.params = EXTEND({}, plugin.params || {});
plugin.name = name;
return plugin;
}
/**
* Try to group sequential elements of plugins array.
*
* @param {Object} plugins input plugins
* @return {Array} output plugins
*/
function optimizePluginsArray(plugins) {
var prev;
return plugins.reduce(function(plugins, item) {
if (prev && item.type == prev[0].type) {
prev.push(item);
} else {
plugins.push(prev = [item]);
}
return plugins;
}, []);
}