generator-begcode/dist/generators/java/support/checks/check-java.js

Spring Boot + Angular/React/Vue in one handy generator

import chalk from 'chalk';
import { execaCommandSync } from 'execa';
export default (javaCompatibleVersions) => {
    try {
        const { exitCode, stderr } = execaCommandSync('java -version', { stdio: 'pipe' });
        if (exitCode === 0 && stderr) {
            const matchResult = /(?:java|openjdk)(?: version)? "?(.*)"? /s.exec(stderr);
            if (matchResult && matchResult.length > 0) {
                const javaVersion = matchResult[1];
                const debug = `Detected java version ${javaVersion}`;
                if (javaCompatibleVersions && !new RegExp(`(${javaCompatibleVersions.map(ver => `^${ver}`).join('|')})`).exec(javaVersion)) {
                    const [latest, ...others] = javaCompatibleVersions.concat().reverse();
                    const humanizedVersions = `${others.reverse().join(', ')} or ${latest}`;
                    const warning = `Java ${humanizedVersions} are not found on your computer. Your Java version is: ${chalk.yellow(javaVersion)}`;
                    return { debug, warning, javaVersion };
                }
                return { debug, javaVersion };
            }
        }
        return { error: `Error parsing Java version. Output: ${stderr}` };
    }
    catch (error) {
        return { error: `Java was not found on your computer (${error.message}).` };
    }
};