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var fs = require('graceful-fs');
var mkdirp = require('mkdirp');
var destroy = require('destroy');
var tmp = require('tmp');
var request = require('request');
var path = require('path');
var Promise = require('./promise');
// Write a stream to a file
function writeStream(filename, st) {
var d = Promise.defer();
var wstream = fs.createWriteStream(filename);
var cleanup = function() {
destroy(wstream);
wstream.removeAllListeners();
};
wstream.on('finish', function () {
cleanup();
d.resolve();
});
wstream.on('error', function (err) {
cleanup();
d.reject(err);
});
st.on('error', function(err) {
cleanup();
d.reject(err);
});
st.pipe(wstream);
return d.promise;
}
// Copy a file using stream
function copyFile(from, to) {
return Promise()
.then(function() {
return writeStream(to, fs.createReadStream(from));
});
}
// Return a promise resolved with a boolean
function fileExists(filename) {
var d = Promise.defer();
fs.exists(filename, function(exists) {
d.resolve(exists);
});
return d.promise;
}
// Generate temporary file
function genTmpFile(opts) {
return Promise.nfcall(tmp.file, opts)
.get(0);
}
// Download an image
function download(uri, dest) {
return writeStream(dest, request(uri));
}
// Find a filename available in a folder
function uniqueFilename(base, filename) {
var ext = path.extname(filename);
filename = path.resolve(base, filename);
filename = path.join(path.dirname(filename), path.basename(filename, ext));
var _filename = filename+ext;
var i = 0;
while (fs.existsSync(filename)) {
_filename = filename + '_' + i + ext;
i = i + 1;
}
return Promise(path.relative(base, _filename));
}
// Create all required folder to create a file
function ensureFile(filename) {
var base = path.dirname(filename);
return Promise.nfcall(mkdirp, base);
}
module.exports = {
exists: fileExists,
existsSync: fs.existsSync,
mkdirp: Promise.nfbind(mkdirp),
readFile: Promise.nfbind(fs.readFile),
writeFile: Promise.nfbind(fs.writeFile),
stat: Promise.nfbind(fs.stat),
statSync: fs.statSync,
readdir: Promise.nfbind(fs.readdir),
writeStream: writeStream,
copy: copyFile,
tmpFile: genTmpFile,
download: download,
uniqueFilename: uniqueFilename,
ensure: ensureFile
};
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