积少成多, 聚沙成塔

const { readFileSync, writeFileSync } = require("fs");
const { parseSaveGame } = require('oni-save-parser');

const modsFile = JSON.parse(readFileSync('mods.json'))
console.log('parsing game... (this might take a while)')
const gameSave = parseSaveGame(readFileSync('world.sav').buffer, {
    versionStrictness: 'none'
})

const gameActiveMods = gameSave.world.active_mods
const steamMods = modsFile.mods

const gameActiveModIds = gameActiveMods.map(m => m.id)
const steamModIds = steamMods.map(m => m.label.id)

const missingMods = gameActiveModIds.filter(id => steamModIds.indexOf(id) == -1).map(id => gameActiveMods[gameActiveMods.findIndex(m => m.id == id)])
if (missingMods.length > 0) {
    console.log('The following mods are missing, please install/subscribe from Steam')
    console.log(missingMods)
    process.exit(1)
}

console.log(steamMods.map(m => m.label.title))

steamMods.sort((a, b) => {
    const modIDA = a.label.id
    const modIDB = b.label.id

    const indexA = gameActiveModIds.indexOf(modIDA)
    const indexB = gameActiveModIds.indexOf(modIDB)

    // put active mods before inactive mods
    if (indexA != -1 && indexB != -1) {
        return indexA - indexB
    }

    if (indexA != -1) {
        return -1
    }

    if (indexB != -1) {
        return 1
    }

    // sort inactive mods by name
    return a.label.title.toLowerCase().localeCompare(b.label.title.toLowerCase())
})

console.log(steamMods.map(m => m.label.title))

writeFileSync('mods.json', JSON.stringify(modsFile))