# all files / red/runtime/nodes/ library.js

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     /**
     * Copyright JS Foundation and other contributors, http://js.foundation
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     * http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     **/

    var fs = require('fs');
    var fspath = require('path');
    var when = require('when');

    var runtime;

    var exampleRoots = {};
    var exampleFlows = null;

    function getFlowsFromPath(path) {
        return when.promise(function(resolve,reject) {
            var result = {};
            fs.readdir(path,function(err,files) {
                var promises = [];
                var validFiles = [];
                files.forEach(function(file) {
                    var fullPath = fspath.join(path,file);
                    var stats = fs.lstatSync(fullPath);
                    Iif (stats.isDirectory()) {
                        validFiles.push(file);
                        promises.push(getFlowsFromPath(fullPath));
                    } else Eif (/\.json$/.test(file)){
                        validFiles.push(file);
                        promises.push(when.resolve(file.split(".")[0]))
                    }
                })
                var i=0;
                when.all(promises).then(function(results) {
                    results.forEach(function(r) {
                        Eif (typeof r === 'string') {
                            result.f = result.f||[];
                            result.f.push(r);
                        } else {
                            result.d = result.d||{};
                            result.d[validFiles[i]] = r;
                        }
                        i++;
                    })

                    resolve(result);
                })
            });
        })
    }

    function addNodeExamplesDir(module) {
        exampleRoots[module.name] = module.path;
        getFlowsFromPath(module.path).then(function(result) {
            exampleFlows = exampleFlows||{d:{}};
            exampleFlows.d[module.name] = result;
        });
    }
    function removeNodeExamplesDir(module) {
        delete exampleRoots[module];
        if (exampleFlows && exampleFlows.d) {
            delete exampleFlows.d[module];
        }
        if (exampleFlows && Object.keys(exampleFlows.d).length === 0) {
            exampleFlows = null;
        }
    }

    function init(_runtime) {

        runtime = _runtime;

        exampleRoots = {};
        exampleFlows = null;

        runtime.events.removeListener("node-examples-dir",addNodeExamplesDir);
        runtime.events.on("node-examples-dir",addNodeExamplesDir);
        runtime.events.removeListener("node-module-uninstalled",removeNodeExamplesDir);
        runtime.events.on("node-module-uninstalled",removeNodeExamplesDir);
    }

    function getExampleFlows() {
        return exampleFlows;
    }

    function getExampleFlowPath(module,path) {
        if (exampleRoots[module]) {
            return fspath.join(exampleRoots[module],path)+".json";
        }
        return null;
    }

    module.exports = {
        init: init,
        getExampleFlows: getExampleFlows,
        getExampleFlowPath: getExampleFlowPath
    }