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