liteloader.ts

import { FileSystem, resolveFileSystem } from '@xmcl/system'

export interface LiteloaderModMetadata {
  readonly mcversion: string
  readonly name: string
  readonly revision: number

  readonly author?: string
  readonly version?: string
  readonly description?: string
  readonly url?: string

  readonly tweakClass?: string
  readonly dependsOn?: string[]
  readonly injectAt?: string
  readonly requiredAPIs?: string[]
  readonly classTransformerClasses?: string[]
}

export async function readLiteloaderMod(mod: string | Uint8Array | FileSystem) {
  const fs = await resolveFileSystem(mod)

  try {
    const text = await fs.readFile('litemod.json', 'utf-8').then((s) => s.replace(/^\uFEFF/, '')).catch(() => undefined)
    if (!text) {
      throw Object.assign(new Error('Illegal input type! Expect a jar file contains litemod.json'), {
        mod,
        name: 'IllegalInputType',
      })
    }
    const metadata = JSON.parse(text.trim(), (key, value) => key === 'revision' ? Number.parseInt(value, 10) : value) as LiteloaderModMetadata
    if (!metadata.version) {
      (metadata as any).version = `${metadata.mcversion}:${metadata.revision || 0}`
    }
    return metadata
  } finally {
    if (fs !== mod) fs.close()
  }
}