55 lines
1.6 KiB
JavaScript
55 lines
1.6 KiB
JavaScript
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/**
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* Walk up the directory tree until the specified path is found.
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*
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* @module walk-back
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* @example
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* const walkBack = require('walk-back')
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*/
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/**
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* Returns an absolute file path (if found) else `null`.
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*
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* @param {string} - the directory to start in
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* @param {string} - the path we're looking for
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* @return {string}
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* @alias module:walk-back
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* @example
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* > walkBack('/Users/lloyd/Documents/75lb/walk-back', 'package.json')
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* '/Users/lloyd/Documents/75lb/walk-back/package.json'
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*
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* > walkBack('/Users/lloyd/Documents/75lb/walk-back', '75lb')
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* '/Users/lloyd/Documents/75lb'
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*
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* > walkBack('/Users/lloyd/Documents/75lb/walk-back', '.bash_profile')
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* '/Users/lloyd/.bash_profile'
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*
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* > walkBack('.', '.bash_profile')
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* '/Users/lloyd/.bash_profile'
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*
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* > walkBack('/Users/lloyd/Documents/75lb/walk-back', 'non-existent.file')
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* null
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*/
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function walkBack (startAt, lookingFor) {
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const path = require('path')
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const fs = require('fs')
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startAt = path.resolve(startAt)
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if (fs.existsSync(startAt) && fs.statSync(startAt).isDirectory()) {
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const dirs = path.resolve(startAt).split(path.sep)
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for (let i = 0; i < dirs.length; i++) {
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const basedir = i < dirs.length - 1
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? dirs.slice(0, dirs.length - i).join(path.sep)
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: path.sep
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if (fs.existsSync(path.join(basedir, lookingFor))) {
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return path.join(basedir, lookingFor)
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}
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}
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/* if we reached here, nothing was found */
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return null
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} else {
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throw new Error('startAt path must be an existing directory: ' + startAt)
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}
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}
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module.exports = walkBack
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