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var fs = require('fs');
var path = require('path');
var pify = require('pify');
var stat = pify(fs.stat);
var readFile = pify(fs.readFile);
var resolve = path.resolve;
var cache = Object.create(null);
function convert(content, encoding) {
if (Buffer.isEncoding(encoding)) {
return content.toString(encoding);
}
return content;
}
module.exports = function (path, encoding) {
path = resolve(path);
return stat(path).then(function (stats) {
var item = cache[path];
if (item && item.mtime.getTime() === stats.mtime.getTime()) {
return convert(item.content, encoding);
}
return readFile(path).then(function (data) {
cache[path] = {
mtime: stats.mtime,
content: data
};
return convert(data, encoding);
});
}).catch(function (err) {
cache[path] = null;
return Promise.reject(err);
});
};
module.exports.sync = function (path, encoding) {
path = resolve(path);
try {
var stats = fs.statSync(path);
var item = cache[path];
if (item && item.mtime.getTime() === stats.mtime.getTime()) {
return convert(item.content, encoding);
}
var data = fs.readFileSync(path);
cache[path] = {
mtime: stats.mtime,
content: data
};
return convert(data, encoding);
} catch (err) {
cache[path] = null;
throw err;
}
};
module.exports.get = function (path, encoding) {
path = resolve(path);
if (cache[path]) {
return convert(cache[path].content, encoding);
}
return null;
};
module.exports.clear = function () {
cache = Object.create(null);
};
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