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var _ = require('lodash');
var util = require('util');
var path = require('path');
var fs = require('fs');
var mkdirp = require('mkdirp');
var Promise = require('../utils/promise');
var BaseFS = require('./');
function NodeFS() {
BaseFS.call(this);
}
util.inherits(NodeFS, BaseFS);
// Check if a file exists, run a Promise(true) if that's the case, Promise(false) otherwise
NodeFS.prototype.exists = function(filename) {
var d = Promise.defer();
fs.exists(filename, function(exists) {
d.resolve(exists);
});
return d.promise;
};
// Read a file and returns a promise with the content as a buffer
NodeFS.prototype.read = function(filename) {
return Promise.nfcall(fs.readFile, filename);
};
// Write a file and returns a promise
NodeFS.prototype.write = function(filename, buffer) {
var folder = path.dirname(filename);
return Promise()
.then(function() {
if (!folder) return;
return Promise.nfcall(mkdirp, folder);
})
.then(function() {
return Promise.nfcall(fs.writeFile, filename, buffer);
});
};
// List files in a directory
NodeFS.prototype.readdir = function(folder) {
return Promise.nfcall(fs.readdir, folder)
.then(function(files) {
return _.chain(files)
.map(function(file) {
if (file == '.' || file == '..') return;
var stat = fs.statSync(path.join(folder, file));
if (stat.isDirectory()) file = file + path.sep;
return file;
})
.compact()
.value();
});
};
// Load a JSON/JS file
NodeFS.prototype.loadAsObject = function(filename) {
return Promise()
.then(function() {
var jsFile;
try {
jsFile = require.resolve(filename);
// Invalidate node.js cache for livreloading
delete require.cache[jsFile];
return require(jsFile);
}
catch(err) {
return Promise.reject(err);
}
});
};
module.exports = NodeFS;
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