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mod.ts
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mod.ts
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import {
dirname,
extname,
fromFileUrl,
join,
toFileUrl,
walk,
} from "./deps.ts";
import { error } from "./error.ts";
interface Manifest {
routes: string[];
islands: string[];
}
export async function collect(directory: string): Promise<Manifest> {
const routesDir = join(directory, "./routes");
const islandsDir = join(directory, "./islands");
const routes = [];
try {
const routesUrl = toFileUrl(routesDir);
// TODO(lucacasonato): remove the extranious Deno.readDir when
// https://github.com/denoland/deno_std/issues/1310 is fixed.
for await (const _ of Deno.readDir(routesDir)) {
// do nothing
}
const routesFolder = walk(routesDir, {
includeDirs: false,
includeFiles: true,
exts: ["tsx", "jsx", "ts", "js"],
});
for await (const entry of routesFolder) {
if (entry.isFile) {
const file = toFileUrl(entry.path).href.substring(
routesUrl.href.length,
);
routes.push(file);
}
}
} catch (err) {
if (err instanceof Deno.errors.NotFound) {
// Do nothing.
} else {
throw err;
}
}
routes.sort();
const islands = [];
try {
const islandsUrl = toFileUrl(islandsDir);
for await (const entry of Deno.readDir(islandsDir)) {
if (entry.isDirectory) {
error(
`Found subdirectory '${entry.name}' in islands/. The islands/ folder must not contain any subdirectories.`,
);
}
if (entry.isFile) {
const ext = extname(entry.name);
if (![".tsx", ".jsx", ".ts", ".js"].includes(ext)) continue;
const path = join(islandsDir, entry.name);
const file = toFileUrl(path).href.substring(islandsUrl.href.length);
islands.push(file);
}
}
} catch (err) {
if (err instanceof Deno.errors.NotFound) {
// Do nothing.
} else {
throw err;
}
}
islands.sort();
return { routes, islands };
}
export async function generate(directory: string, manifest: Manifest) {
const { routes, islands } = manifest;
const output = `// DO NOT EDIT. This file is generated by fresh.
// This file SHOULD be checked into source version control.
// This file is automatically updated during development when running \`dev.ts\`.
${
routes.map((file, i) => `import * as $${i} from "./routes${file}";`).join(
"\n",
)
}
${
islands.map((file, i) => `import * as $$${i} from "./islands${file}";`)
.join("\n")
}
const manifest = {
routes: {
${
routes.map((file, i) => `${JSON.stringify(`./routes${file}`)}: $${i},`)
.join("\n ")
}
},
islands: {
${
islands.map((file, i) => `${JSON.stringify(`./islands${file}`)}: $$${i},`)
.join("\n ")
}
},
baseUrl: import.meta.url,
};
export default manifest;
`;
const proc = Deno.run({
cmd: [Deno.execPath(), "fmt", "-"],
stdin: "piped",
stdout: "piped",
stderr: "null",
});
const raw = new ReadableStream({
start(controller) {
controller.enqueue(new TextEncoder().encode(output));
controller.close();
},
});
await raw.pipeTo(proc.stdin.writable);
const out = await proc.output();
await proc.status();
proc.close();
const manifestStr = new TextDecoder().decode(out);
const manifestPath = join(directory, "./fresh.gen.ts");
await Deno.writeTextFile(manifestPath, manifestStr);
console.log(
`%cThe manifest has been generated for ${routes.length} routes and ${islands.length} islands.`,
"color: blue; font-weight: bold",
);
}
export async function dev(base: string, entrypoint: string) {
entrypoint = new URL(entrypoint, base).href;
const dir = dirname(fromFileUrl(base));
let currentManifest: Manifest;
const prevManifest = Deno.env.get("FRSH_DEV_PREVIOUS_MANIFEST");
if (prevManifest) {
currentManifest = JSON.parse(prevManifest);
} else {
currentManifest = { islands: [], routes: [] };
}
const newManifest = await collect(dir);
Deno.env.set("FRSH_DEV_PREVIOUS_MANIFEST", JSON.stringify(newManifest));
const manifestChanged =
!arraysEqual(newManifest.routes, currentManifest.routes) ||
!arraysEqual(newManifest.islands, currentManifest.islands);
if (manifestChanged) await generate(dir, newManifest);
await import(entrypoint);
}
function arraysEqual<T>(a: T[], b: T[]): boolean {
if (a.length !== b.length) return false;
for (let i = 0; i < a.length; ++i) {
if (a[i] !== b[i]) return false;
}
return true;
}