@sap/cds-dk/lib/init/template/java/index.js

Command line client and development toolkit for the SAP Cloud Application Programming Model

const os = require('os')
const cds = require('../../../cds')
const { exists, copy, rimraf, fs:{promises:{ mkdtemp }}, path } = cds.utils, { join } = path
const cmd = require('../../../util/command')
const mvn = require('../../mvn')
const { merge } = require('../../merge')
const { bold, info } = require('../../../util/term')
const { URLS, OPTIONS: { NODEJS, JAVA } } = require('../../constants')
const { options } = cds.cli

module.exports = class JavaTemplate extends require('../../plugin') {

    static help() {
        return 'creates a Java-based project'
    }

    static hasInProduction() {
        return exists('pom.xml')
    }

    async canRun() {
        if (options.add?.has(NODEJS)) {
            throw `only one runtime per project is supported – specify either ${bold(JAVA)} or ${bold(NODEJS)}`
        }
        return true
    }

    async run() {
        const projectName = path.basename(cds.root)
        const { params, artifactId, archetypeVersion } = await mvn.init(projectName)
        console.log(`using Maven archetype version ${archetypeVersion}`)

        const temp = await mkdtemp(join(os.tmpdir(), `${path.basename(cds.root)}_`))
        // preserve existing package.json (if any)
        let preservedPackageJsonPath
        if (exists('package.json')) {
            preservedPackageJsonPath = join(temp, 'package.json')
            await copy('package.json').to(preservedPackageJsonPath)
        }
        try {
            await cmd.spawnCommand('mvn', params, { cwd: temp })
            await copy(join(temp, artifactId)).to(cds.root)
            if (preservedPackageJsonPath) {
                // merge template package.json into preserved one
                // (not the other way around)
                // to give preserved values precedence
                await merge('package.json').into(preservedPackageJsonPath)
                await copy(preservedPackageJsonPath).to('package.json')
            }
        } catch (err) {
            if (err.code === 'ENOENT' && err.path === 'mvn') {
                throw `Maven executable 'mvn' not found. Follow ${info(URLS.MAVEN_INSTALL_HELP)} and install Maven on your machine.`
            }
            throw err
        } finally {
            await rimraf(temp)
        }
    }
}