enso/tools/ci/nightly/preflight-check.js

const fs = require('fs')
const github = require('./github')

const currentHeadSha = process.argv[2]
const buildConfigPath = '../../../build.sbt'

/// Returns the current date formatted as 'YYYY-mm-dd'.
function isoDate() {
    const now = new Date()
    const year = '' + now.getFullYear()
    let month = '' + (now.getMonth() + 1)
    let day = '' + now.getDate()
    if (month.length < 2) {
        month = '0' + month
    }
    if (day.length < 2) {
        day = '0' + day
    }
    return year + '-' + month + '-' + day
}

/// Sets the step output 'proceed'.
function setProceed(proceed) {
    console.log('::set-output name=proceed::' + proceed)
}

/// Sets the step output 'nightly-version'.
function setVersionString(name) {
    console.log('::set-output name=nightly-version::' + name)
}

/// Sets the step output 'nightly-edition'.
function setEditionName(name) {
    console.log('::set-output name=nightly-edition::' + name)
}

/** Checks if there are any new changes to see if the nightly build should
 * proceed.
 */
function checkProceed(nightlies) {
    if (nightlies.length == 0) {
        console.log('No prior nightly releases found. Proceeding with the first release.')
        return true
    }

    const first = nightlies[0]
    const firstNightlySha = first.target_commitish
    if (firstNightlySha == currentHeadSha) {
        console.log(
            'Current commit (' +
                currentHeadSha +
                ') is the same as for the most recent nightly build. A new build is not needed.'
        )
        return false
    } else {
        console.log(
            'Current commit (' +
                currentHeadSha +
                ') is different from the most recent nightly build (' +
                firstNightlySha +
                '). Proceeding with a new nightly build.'
        )
        return true
    }
}

/** Prepares a version string and edition name for the nightly build.
 *
 * A '-SNAPSHOT' suffix is added if it is not already present, next the current
 * date is appended. If this is not the first nightly build on that date, an
 * increasing numeric suffix is added.
 */
function prepareVersions(nightlies) {
    function isTaken(suffix) {
        return nightlies.some(entry => entry.tag_name.endsWith(suffix))
    }

    const content = fs.readFileSync(buildConfigPath, { encoding: 'utf-8' })
    const match = content.match(/val ensoVersion += +"(.*)"/)
    if (!match) {
        console.error('Could not find the version string in configuration!')
        process.exit(1)
    }

    const version = match[1]
    let baseName = version
    if (!baseName.endsWith('SNAPSHOT')) {
        baseName += '-SNAPSHOT'
    }

    const now = isoDate()
    function makeSuffix(ix) {
        if (ix == 0) {
            return now
        } else {
            return now + '.' + ix
        }
    }

    let ix = 0
    while (isTaken(makeSuffix(ix))) {
        ix++
    }

    const suffix = makeSuffix(ix)
    const versionName = baseName + '.' + suffix
    const edition = 'nightly-' + suffix
    console.log("The build will be using version '" + versionName + "'")
    console.log("The build will be using edition '" + edition + "'")
    return {
        version: versionName,
        edition: edition,
    }
}

async function main() {
    const nightlies = await github.fetchNightlies()
    const shouldProceed = checkProceed(nightlies)
    setProceed(shouldProceed)
    if (shouldProceed) {
        const versions = prepareVersions(nightlies)
        setVersionString(versions.version)
        setEditionName(versions.edition)
    }
}

main().catch(err => {
    console.error(err)
    process.exit(1)
})