source: trip-planner-front/node_modules/find-cache-dir/index.js@ eed0bf8

'use strict';
const path = require('path');
const fs = require('fs');
const commonDir = require('commondir');
const pkgDir = require('pkg-dir');
const makeDir = require('make-dir');

const {env, cwd} = process;

const isWritable = path => {
        try {
                fs.accessSync(path, fs.constants.W_OK);
                return true;
        } catch (_) {
                return false;
        }
};

function useDirectory(directory, options) {
        if (options.create) {
                makeDir.sync(directory);
        }

        if (options.thunk) {
                return (...arguments_) => path.join(directory, ...arguments_);
        }

        return directory;
}

function getNodeModuleDirectory(directory) {
        const nodeModules = path.join(directory, 'node_modules');

        if (
                !isWritable(nodeModules) &&
                (fs.existsSync(nodeModules) || !isWritable(path.join(directory)))
        ) {
                return;
        }

        return nodeModules;
}

module.exports = (options = {}) => {
        if (env.CACHE_DIR && !['true', 'false', '1', '0'].includes(env.CACHE_DIR)) {
                return useDirectory(path.join(env.CACHE_DIR, 'find-cache-dir'), options);
        }

        let {cwd: directory = cwd()} = options;

        if (options.files) {
                directory = commonDir(directory, options.files);
        }

        directory = pkgDir.sync(directory);

        if (!directory) {
                return;
        }

        const nodeModules = getNodeModuleDirectory(directory);
        if (!nodeModules) {
                return undefined;
        }

        return useDirectory(path.join(directory, 'node_modules', '.cache', options.name), options);
};