Refactor how Gat compiles templates

A new way how Gat handles the template generation.

.github/templates/build.ts

@@ -8,7 +8,7 @@ const setupNodeStep: UseStep = {
   uses: "actions/setup-node@v3",
 };
 
-new Workflow("Build")
+export default new Workflow("Build")
   .on("push", { branches: ["main"] })
   .on("pull_request")
   .addJob("build", {
@@ -31,4 +31,3 @@ new Workflow("Build")
       { name: "Check format problems", run: "npm run format:check" },
     ],
   })
-  .compile();

.github/templates/index.ts

@@ -0,0 +1,3 @@
+import Build from './build'
+
+Build.compile('build.yml')

.github/workflows/build.yml

@@ -28,4 +28,3 @@ jobs:
         run: npm run lint
       - name: Check format problems
         run: npm run format:check
-

src/__snapshots__/workflow.spec.ts.snap

@@ -1,4 +1,4 @@
-// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+// Vitest Snapshot v1
 
 exports[`Workflow > allows a job matrix 1`] = `
 "# Workflow automatically generated by gat

src/cli.ts

@@ -4,83 +4,27 @@ import path from "path";
 import { exec } from "child_process";
 import { Command } from "commander";
 import { promisify } from "util";
-import debounce from "lodash/debounce";
 
 const execPromise = promisify(exec);
-const writeFilePromise = promisify(fs.writeFile);
 const folder = path.join(process.cwd(), ".github", "templates");
 
-const parseFile = async (templateFile: string) => {
-  // NOTE: can we improve this using ts-node or typescript programatically?
-  const { stdout } = await execPromise(
-    `npx ts-node ${
-      process.env["GAT_BUILD_FLAGS"] ?? "--swc -T"
-    } ${templateFile}`
-  );
-
-  await writeFilePromise(
-    path.join(
-      process.cwd(),
-      ".github",
-      "workflows",
-      templateFile.split("/").at(-1)!.replace(".ts", ".yml")
-    ),
-    stdout
-  );
-};
-
 const cli = new Command();
 
 cli
-  .version("1.0.0")
+  .version("2.0.0")
   .description("Write your GitHub Actions workflows using TypeScript");
 
 cli
   .command("build")
   .description("Transpile all Gat templates into GitHub Actions workflows.")
-  .argument("[file]", "(Optional) A Gat template file")
-  .action(async (file) => {
+  .action(async () => {
     if (!fs.existsSync(path.join(folder, "..", "workflows"))) {
       fs.mkdirSync(path.join(folder, "..", "workflows"));
     }
 
-    if (file !== undefined) {
-      await parseFile(file);
-    } else {
-      await Promise.all(
-        fs.readdirSync(folder).map(async (templateFile) => {
-          if (!templateFile.match(/^shared$/)) {
-            await parseFile(`${path.join(folder, templateFile)}`);
-          }
-        })
-      );
-    }
+    await execPromise(`npx ts-node ${process.env["GAT_BUILD_FLAGS"] ?? "--swc -T"} ${path.join(folder, 'index.ts')}`);
 
     process.exit(0);
   });
 
-cli
-  .command("watch")
-  .description(
-    "Watch file changes in your Gat templates folder and transpile them automatically."
-  )
-  .action(async () => {
-    const parseWatchedFile = debounce(async (fileName) => {
-      const start = process.hrtime.bigint();
-      process.stdout.write(
-        `😸 Detected change on file ${fileName}. Transpiling... `
-      );
-      await parseFile(path.join(folder, fileName.toString()));
-      console.log(
-        `Done in ${(
-          Number(process.hrtime.bigint() - start) / 1_000_000
-        ).toFixed(2)}ms`
-      );
-    }, 1000);
-    console.log(`😼 Watching file changes on ${folder}...`);
-    fs.watch(folder).on("change", (_eventName, fileName) => {
-      parseWatchedFile(fileName);
-    });
-  });
-
 cli.parse(process.argv);

src/workflow.ts

@@ -1,10 +1,15 @@
 import { dump } from "js-yaml";
 import kebabCase from "lodash/kebabCase";
+import fs from "fs";
+import path from "path";
+import { promisify } from "util";
 
 import { ConcurrencyGroup, Job, JobOptions, StringWithNoSpaces } from "./job";
 import type { Event, EventName, EventOptions } from "./event";
 import { BaseStep, Step } from "./step";
 
+const writeFilePromise = promisify(fs.writeFile);
+
 const DEFAULT_RUNNERS = ["ubuntu-22.04"];
 
 interface DefaultOptions {
@@ -73,7 +78,7 @@ export class Workflow<
     return isSelfHosted ? ["self-hosted", runnerName] : runnerName;
   }
 
-  compile() {
+  compile(filepath?: string) {
     const result = {
       name: this.name,
       on: Object.fromEntries(
@@ -187,8 +192,16 @@ export class Workflow<
       }
     )}`;
 
-    console.log(compiled);
+    if (!filepath) return compiled
 
-    return compiled;
+    return writeFilePromise(
+      path.join(
+        process.cwd(),
+        ".github",
+        "workflows",
+        filepath
+      ),
+      compiled
+    );
   }
 }