92 lines
2.7 KiB
JavaScript
92 lines
2.7 KiB
JavaScript
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var path = require("path");
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/**
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* Node Plugin Loader
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*/
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var PluginLoader = function(less) {
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this.less = less;
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};
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PluginLoader.prototype.tryLoadPlugin = function(name, argument) {
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var plugin = this.tryRequirePlugin(name);
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if (plugin) {
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// support plugins being a function
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// so that the plugin can be more usable programmatically
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if (typeof plugin === "function") {
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plugin = new plugin();
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}
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if (plugin.minVersion) {
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if (this.compareVersion(plugin.minVersion, this.less.version) < 0) {
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console.log("plugin " + name + " requires version " + this.versionToString(plugin.minVersion));
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return null;
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}
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}
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if (argument) {
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if (!plugin.setOptions) {
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console.log("options have been provided but the plugin " + name + "does not support any options");
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return null;
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}
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try {
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plugin.setOptions(argument);
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}
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catch(e) {
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console.log("Error setting options on plugin " + name);
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console.log(e.message);
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return null;
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}
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}
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return plugin;
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}
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return null;
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};
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PluginLoader.prototype.compareVersion = function(aVersion, bVersion) {
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for (var i = 0; i < aVersion.length; i++) {
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if (aVersion[i] !== bVersion[i]) {
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return parseInt(aVersion[i]) > parseInt(bVersion[i]) ? -1 : 1;
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}
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}
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return 0;
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};
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PluginLoader.prototype.versionToString = function(version) {
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var versionString = "";
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for (var i = 0; i < version.length; i++) {
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versionString += (versionString ? "." : "") + version[i];
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}
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return versionString;
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};
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PluginLoader.prototype.tryRequirePlugin = function(name) {
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// is at the same level as the less.js module
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try {
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return require("../../../" + name);
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}
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catch(e) {
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}
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// is installed as a sub dependency of the current folder
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try {
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return require(path.join(process.cwd(), "node_modules", name));
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}
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catch(e) {
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}
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// is referenced relative to the current directory
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try {
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return require(path.join(process.cwd(), name));
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}
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catch(e) {
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}
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// unlikely - would have to be a dependency of where this code was running (less.js)...
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if (name[0] !== '.') {
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try {
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return require(name);
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}
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catch(e) {
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}
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}
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};
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PluginLoader.prototype.printUsage = function(plugins) {
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for (var i = 0; i < plugins.length; i++) {
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var plugin = plugins[i];
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if (plugin.printUsage) {
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plugin.printUsage();
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}
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}
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};
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module.exports = PluginLoader;
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