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'use strict';
var path = require('path');
var isDir = require('is-directory');
var loadPackageProp = require('./loadPackageProp');
var loadRc = require('./loadRc');
var loadJs = require('./loadJs');
var loadDefinedFile = require('./loadDefinedFile');
module.exports = function (options) {
// These cache Promises that resolve with results, not the results themselves
var fileCache = (options.cache) ? new Map() : null;
var directoryCache = (options.cache) ? new Map() : null;
var transform = options.transform || identityPromise;
function clearFileCache() {
if (fileCache) fileCache.clear();
}
function clearDirectoryCache() {
if (directoryCache) directoryCache.clear();
}
function clearCaches() {
clearFileCache();
clearDirectoryCache();
}
function load(searchPath, configPath) {
if (!configPath && options.configPath) {
configPath = options.configPath;
}
if (configPath) {
var absoluteConfigPath = path.resolve(process.cwd(), configPath);
if (fileCache && fileCache.has(absoluteConfigPath)) {
return fileCache.get(absoluteConfigPath);
}
var result = loadDefinedFile(absoluteConfigPath, options)
.then(transform);
if (fileCache) fileCache.set(absoluteConfigPath, result);
return result;
}
if (!searchPath) return Promise.resolve(null);
var absoluteSearchPath = path.resolve(process.cwd(), searchPath);
return isDirectory(absoluteSearchPath)
.then(function (searchPathIsDirectory) {
var directory = (searchPathIsDirectory)
? absoluteSearchPath
: path.dirname(absoluteSearchPath);
return searchDirectory(directory);
});
}
function searchDirectory(directory) {
if (directoryCache && directoryCache.has(directory)) {
return directoryCache.get(directory);
}
var result = Promise.resolve()
.then(function () {
if (!options.packageProp) return;
return loadPackageProp(directory, options);
})
.then(function (result) {
if (result || !options.rc) return result;
return loadRc(path.join(directory, options.rc), options);
})
.then(function (result) {
if (result || !options.js) return result;
return loadJs(path.join(directory, options.js));
})
.then(function (result) {
if (result) return result;
var splitPath = directory.split(path.sep);
var nextDirectory = (splitPath.length > 1)
? splitPath.slice(0, -1).join(path.sep)
: null;
if (!nextDirectory || directory === options.stopDir) return null;
return searchDirectory(nextDirectory);
})
.then(transform);
if (directoryCache) directoryCache.set(directory, result);
return result;
}
return {
load: load,
clearFileCache: clearFileCache,
clearDirectoryCache: clearDirectoryCache,
clearCaches: clearCaches,
};
};
function isDirectory(filepath) {
return new Promise(function (resolve, reject) {
return isDir(filepath, function (err, dir) {
if (err) return reject(err);
return resolve(dir);
});
});
}
function identityPromise(x) {
return Promise.resolve(x);
}
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