'use strict';
var path = require('path');
var micromatch = require('micromatch');
// Skip external modules. Based on http://git.io/pzPO.
var internalModuleRegexp = process.platform === 'win32' ?
/* istanbul ignore next */
/^(\.|\w:)/ :
/^[\/.]/;
module.exports = {
internalOnly: internalModuleRegexp.test.bind(internalModuleRegexp),
/**
* Create a filter function for use with module-deps, allowing the specified
* external modules through.
*
* @param {Array<string>} indexes - the list of entry points that will be
* used by module-deps
* @param {Object} options - An options object with `external` being a
* micromatch-compaitible glob. *NOTE:* the glob will be matched relative to
* the top-level node_modules directory for each entry point.
* @return {function} - A function for use as the module-deps `postFilter`
* options.
*/
externals: function externalModuleFilter(indexes, options) {
var externalFilters = false;
if (options.external) {
externalFilters = indexes.map(function (index) {
// grab the path of the top-level node_modules directory.
var topNodeModules = path.join(path.dirname(index), 'node_modules');
return function matchGlob(file, pkg) {
// if a module is not found, don't include it.
if (!file || !pkg) {
return false;
}
// if package.json specifies a 'main' script, strip that path off
// the file to get the module's directory.
// otherwise, just use the dirname of the file.
if (pkg.main) {
file = file.slice(0, -path.normalize(pkg.main).length);
} else {
file = path.dirname(file);
}
// test the path relative to the top node_modules dir.
var p = path.relative(topNodeModules, file);
return micromatch.any(p, options.external);
};
});
}
return function (id, file, pkg) {
var internal = internalModuleRegexp.test(id);
return internal || (externalFilters &&
externalFilters
.some(function (f) {
return f(file, pkg);
}));
};
}
};
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