bumpVersion.js

/* global __dirname, process, require */

const fs = require('fs')
const path = require('path')

const FILE_ENCODING = 'utf8'
const FILENAME = 'package.json'
const VERSION_MAJOR = 'major'
const VERSION_MINOR = 'minor'
const VERSION_PATCH = 'patch'

const REGEX_MAJOR_VERSION = /(\d+)\.\d+\.\d+/
const REGEX_MINOR_VERSION = /\d+\.(\d+)\.\d+/
const REGEX_PATCH_VERSION = /\d+\.\d+\.(\d+)/
const REGEX_VERSION_WITH_SPACES = /\s+"version":\s+"(.+)",/
const REGEX_VERSION = /"version":\s+"(.+)",/

const filePath = path.join(__dirname, FILENAME)

if (!fs.existsSync(filePath)) {
	console.error(`"${FILENAME}" not found, bailing...`)
	return 1
}

console.log(`"${FILENAME}" found, reading contents...`)

// Open file for reading and writing
// fs.readFileSync(filePath, { encoding: 'UTF8', flag: 'r+' })
// Open file for reading
const packContents = fs.readFileSync(filePath, {
	encoding: FILE_ENCODING,
	flag: 'r'
})
const results = REGEX_VERSION_WITH_SPACES.exec(packContents)

if (!results) {
	console.error(`"version" not found in "${FILENAME}", bailing...`)
	return 2
}

const currentVersion = results[1]
const major = parseInt(REGEX_MAJOR_VERSION.exec(currentVersion)[1], 10)
const minor = parseInt(REGEX_MINOR_VERSION.exec(currentVersion)[1], 10)
const patch = parseInt(REGEX_PATCH_VERSION.exec(currentVersion)[1], 10)

console.log(`Major Version: "${major}"`)
console.log(`Minor Version: "${minor}"`)
console.log(`Patch Version: "${patch}"`)

let newVersion = ''
const selectedBump =
	process.argv.length > 2
		? process.argv[2] // 'major' | 'minor' | 'patch'
		: VERSION_PATCH

switch (selectedBump) {
case VERSION_MAJOR:
	newVersion = `${major + 1}.0.0`
	break
case VERSION_MINOR:
	newVersion = `${major}.${minor + 1}.0`
	break
case VERSION_PATCH:
	newVersion = `${major}.${minor}.${patch + 1}`
	break
default:
	console.log(
		`Invalid bump selected (script was provided "${selectedBump}")...`,
		`Maintaining version "${currentVersion}"...`
	)
	newVersion = currentVersion
	break
}

console.log(
	`Bumping "${selectedBump}" from "${currentVersion}" to version "${newVersion}"...`
)

const newContents = packContents.replace(
	REGEX_VERSION,
	`"version": "${newVersion}",`
)

fs.writeFileSync(filePath, newContents, { encoding: FILE_ENCODING })

return 0