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https://github.com/CompeyDev/bun-lune-loader.git
synced 2024-12-12 04:40:39 +00:00
feat: include initial implementation
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5 changed files with 165 additions and 0 deletions
6
examples/data.luau
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6
examples/data.luau
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return {
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SomeData = {
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"This is string data",
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69
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}
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}
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3
examples/run.ts
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3
examples/run.ts
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import { SomeData } from "./data.luau";
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console.log("Received data: ", SomeData)
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19
src/index.ts
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19
src/index.ts
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import { BunPlugin } from "bun";
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const plugin: BunPlugin = {
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name: "lune",
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async setup(build) {
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const { importPath } = await import("./loader");
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build.onLoad({ filter: /\.(luau|lua)$/ }, (args) => {
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const mod = importPath(args.path);
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return {
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contents: mod,
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loader: "json",
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};
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});
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},
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};
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export default plugin;
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41
src/loader.luau
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41
src/loader.luau
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local process = require("@lune/process")
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local jsonEncode = require("@lune/net").jsonEncode
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local possibleErrors = {
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FILE_NOT_FOUND = "No file exist at the path",
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NOT_A_MODULE = "Module must return at least one value"
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}
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local _, resolvedMod = xpcall(function()
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-- [1] - Path to import
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-- [2] - Whether module import or not
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local mod = require(process.args[1])
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if process.args[2] == "MODULE" and mod == nil then
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error(possibleErrors.NOT_A_MODULE)
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end
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return mod
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end, function(err)
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-- We only need the msg, not trace
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local errMsg = tostring(err):split("stack traceback:")[1]
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for id, msg in possibleErrors do
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if errMsg:match(msg) then
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print(`[bun-loader-lune::ImportError::{id}] ` .. errMsg)
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return
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end
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end
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print("-- [ImportError] --")
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print(tostring(err))
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end)
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if process.args[2] == "MODULE" and typeof(resolvedMod) == "table" then
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local modReprJson = jsonEncode(resolvedMod)
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print("--start @generated JS compatible object--")
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print(modReprJson)
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print("--end @generated JS compatible object--")
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end
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96
src/loader.ts
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96
src/loader.ts
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// We need to grab x.luau, then pass the return values of that to another
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// function in the luau side. This function parses the table and converts
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// it to a JSON object that we can then parse and serve back to the user.
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import { spawnSync, which } from "bun";
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import { exit } from "process";
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// - Execute lune and run loader script with args for source code
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// - return JSON
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export function importPath(path: PathLike): string {
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const lunePath = which("lune");
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if (!lunePath) {
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throw new Error(
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"[bun-plugin-lune::loader] Cannot find `lune` executable in path",
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);
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}
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// Path to luau loader probs shouldnt be hardcoded
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const luneChild = spawnSync({
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cmd: [lunePath, "./loader.luau", path.toString(), "MODULE"],
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cwd: import.meta.dir,
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onExit(_proc, exitCode, _sigCode, err) {
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if (exitCode != 0 && exitCode != null) {
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console.warn(
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`[bun-plugin-lune::loader] \`lune\` process exited with code ${exitCode}`,
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);
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err
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? () => {
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console.warn(
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"[bun-plugin-lune::loader] Internal error: ",
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err.message,
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);
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exit(1);
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}
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: {};
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}
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},
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stderr: "pipe",
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stdout: "pipe",
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});
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const luneStderr = luneChild.stderr.toString();
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if (luneStderr != "") {
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const fmtTrace = luneStderr.split("\n")
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.map((l) => l = " " + l).join("");
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console.warn("\nTRACE:");
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console.warn(fmtTrace, "\n");
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exit(1);
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}
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let luneStdout = luneChild.stdout.toString().split("\n");
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let generatedJSONObject: string;
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// luneStdout format:
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// ...logs n' stuff
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// --start @generated JS compatible object--
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// ...object -- Always is in one line
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// --end @generated JS compatible object--
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// Additional newline (\n)
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// Remove the last empty padding newline
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luneStdout = luneStdout.filter((v) => v != "");
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luneStdout.every((l, n) => {
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// If the stdout line doesn't start with `--`, that means
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// it must be a log, and not the generated output
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if (l.startsWith("--")) {
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if (
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l == "--start @generated JS compatible object--" &&
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luneStdout[n + 2] == "--end @generated JS compatible object--"
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) {
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// The third last index is the end of the generated object
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// The next index is the start of the generated object, after the comment
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generatedJSONObject = luneStdout.slice(n + 1, n + 2)[0];
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return false;
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}
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console.warn(
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"[bun-plugin-lune::loader] invalid JS object returned by internal loader.",
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);
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exit(1);
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} else if (process.env.NODE_ENV == "dev") {
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console.log(l);
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}
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});
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return generatedJSONObject!;
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}
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