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/**
* @author Toru Nagashima
* @copyright 2015 Toru Nagashima. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict"
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
const fs = require("fs")
const path = require("path")
const Cache = require("./cache")
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const cache = new Cache()
/**
* Reads the `package.json` data in a given path.
*
* Don't cache the data.
*
* @param {string} dir - The path to a directory to read.
* @returns {object|null} The read `package.json` data, or null.
*/
function readPackageJson(dir) {
const filePath = path.join(dir, "package.json")
try {
const text = fs.readFileSync(filePath, "utf8")
const data = JSON.parse(text)
if (typeof data === "object" && data !== null) {
data.filePath = filePath
return data
}
}
catch (_err) {
// do nothing.
}
return null
}
//------------------------------------------------------------------------------
// Public Interface
//------------------------------------------------------------------------------
/**
* Gets a `package.json` data.
* The data is cached if found, then it's used after.
*
* @param {string} startPath - A file path to lookup.
* @returns {object|null} A found `package.json` data or `null`.
* This object have additional property `filePath`.
*/
module.exports = function getPackageJson(startPath) {
const startDir = path.dirname(path.resolve(startPath))
let dir = startDir
let prevDir = ""
let data = null
do {
data = cache.get(dir)
if (data) {
if (dir !== startDir) {
cache.set(startDir, data)
}
return data
}
data = readPackageJson(dir)
if (data) {
cache.set(dir, data)
cache.set(startDir, data)
return data
}
// Go to next.
prevDir = dir
dir = path.resolve(dir, "..")
}
while (dir !== prevDir)
cache.set(startDir, null)
return null
}
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