Watch mode support

src/args.ts

@@ -0,0 +1,81 @@
+import { parseArgs } from "node:util";
+import { RendererSchema, type Renderer } from "./types";
+import { MuseError } from "./errors";
+
+export interface CLIArguments {
+  inputFilePath: string;
+
+  options: {
+    write: boolean;
+    check: boolean;
+    outfile: string;
+    help: boolean;
+    minify: boolean;
+    renderer: Renderer;
+    watch: boolean;
+  };
+}
+
+export function parseCLIArguments(argv: string[]): CLIArguments {
+  const { values: options, positionals: args } = parseArgs({
+    args: argv,
+    options: {
+      write: {
+        short: "w",
+        type: "boolean",
+        default: false,
+      },
+      check: {
+        short: "c",
+        type: "boolean",
+        default: false,
+      },
+      outfile: {
+        short: "o",
+        type: "string",
+        default: "playbill.json",
+      },
+      help: {
+        short: "h",
+        default: false,
+        type: "boolean",
+      },
+      minify: {
+        short: "m",
+        default: false,
+        type: "boolean",
+      },
+      renderer: {
+        short: "r",
+        default: "json",
+        type: "string",
+      },
+      watch: {
+        default: false,
+        type: "boolean",
+      },
+    },
+    strict: true,
+    allowPositionals: true,
+  });
+
+  const parsedRenderer = RendererSchema.safeParse(options.renderer);
+
+  if (!parsedRenderer.success) {
+    throw new MuseError(`Invalid renderer: ${parsedRenderer.data}`);
+  }
+
+  return {
+    inputFilePath: args[0] ?? "./binding.yaml",
+
+    options: {
+      write: options.write,
+      check: options.check,
+      outfile: options.outfile,
+      help: options.help,
+      minify: options.minify,
+      renderer: parsedRenderer.data,
+      watch: options.watch,
+    },
+  };
+}

src/filetypes/binding.ts

@@ -6,12 +6,12 @@ import {
   type UnknownResource,
   type Playbill,
 } from "@proscenium/playbill";
-import { loadYAMLFileOrFail } from "./files";
+import { loadYAMLFileOrFail } from "../util/files";
 import { loadResourceFile } from "./resource";
-import { FileNotFoundError } from "./errors";
+import { FileNotFoundError } from "../errors";
 
 const HTMLRenderOptionsSchema = z.object({
-  stylesheet: z.string().optional(),
+  styles: z.array(z.string()).optional(),
 });
 
 const BindingFileSchema = z.object({

src/filetypes/resource.ts

@@ -5,9 +5,9 @@ import {
 } from "@proscenium/playbill";
 import YAML, { YAMLParseError } from "yaml";
 import { ZodError } from "zod";
-import { MalformedResourceFileError } from "./errors";
+import { MalformedResourceFileError } from "../errors";
 import { extractFrontmatter, extractMarkdown } from "./markdown";
-import { loadFileOrFail } from "./files";
+import { loadFileOrFail } from "../util/files";
 
 type FileFormat = "yaml" | "markdown";
 

src/index.ts

@@ -1,101 +1,27 @@
-import { parseArgs } from "node:util";
 import {
   serializePlaybill,
   ValidatedPlaybillSchema,
 } from "@proscenium/playbill";
 import chalk from "chalk";
-import { loadFromBinding, resolveBindingPath } from "./binding";
+import { watch } from "node:fs/promises";
+import { loadFromBinding, resolveBindingPath } from "./filetypes/binding";
 import { usage } from "./usage";
 import { CLIError, MuseError } from "./errors";
 import { renderAsHTML } from "./renderers/html";
+import { parseCLIArguments, type CLIArguments } from "./args";
+import { fullDirname } from "./util/files";
 
 enum ExitCode {
   Success = 0,
   Error = 1,
 }
 
-async function main(): Promise<number> {
-  // -- ARGUMENT PARSING -- //
-  const { values: options, positionals: args } = parseArgs({
-    args: Bun.argv.slice(2),
-    options: {
-      write: {
-        short: "w",
-        type: "boolean",
-        default: false,
-      },
-      check: {
-        short: "c",
-        type: "boolean",
-        default: false,
-      },
-      outfile: {
-        short: "o",
-        type: "string",
-        default: "playbill.json",
-      },
-      help: {
-        short: "h",
-        default: false,
-        type: "boolean",
-      },
-      verbose: {
-        short: "v",
-        default: false,
-        type: "boolean",
-      },
-      minify: {
-        short: "m",
-        default: false,
-        type: "boolean",
-      },
-      renderer: {
-        short: "r",
-        default: "json",
-        type: "string",
-      },
-    },
-    strict: true,
-    allowPositionals: true,
-  });
-
-  // -- HELP TEXT -- //
-  if (options.help) {
-    console.log(usage);
-    return ExitCode.Success;
-  }
-
-  // -- ARG VALIDATION -- //
-  if (options.check && options.write) {
-    throw new CLIError("Cannot use --check and --write together");
-  }
-
-  const VERBOSE = options.verbose;
-
-  /**
-   * Log a message if the vervose flag has been set
-   * @param msg - The message to log
-   */
-  function verboseLog(msg: string) {
-    if (VERBOSE) {
-      console.log(chalk.dim(msg));
-    }
-  }
-
+async function processBinding({ inputFilePath, options }: CLIArguments) {
   // -- BINDING FILE -- //
-  const bindingPathInput = args[0] ?? "./binding.yaml";
-  const bindingPath = await resolveBindingPath(bindingPathInput);
-
-  verboseLog(`Building Playbill with binding: ${bindingPath}`);
-
+  const bindingPath = await resolveBindingPath(inputFilePath);
   const binding = await loadFromBinding(bindingPath);
 
-  verboseLog(
-    `↳ Binding loaded with ${binding.includedFiles.length} associated resources`,
-  );
-
   // -- VALDATE PLAYBILL -- //
-  verboseLog("Validating playbill");
   const validatedPlaybill = ValidatedPlaybillSchema.safeParse(binding.playbill);
 
   if (!validatedPlaybill.success) {
@@ -104,8 +30,6 @@ async function main(): Promise<number> {
     return ExitCode.Error;
   }
 
-  verboseLog("Playbill validated");
-
   // -- EXIT EARLY IF JUST CHECKING VALIDATION --//
   if (options.check) {
     console.log(chalk.green("Playbill validated successfully"));
@@ -129,6 +53,7 @@ async function main(): Promise<number> {
   // -- WRITE TO DISK OR STDOUT --//
   if (options.write) {
     await Bun.write(options.outfile, serializedPlaybill);
+
     return ExitCode.Success;
   }
 
@@ -136,6 +61,47 @@ async function main(): Promise<number> {
   return ExitCode.Success;
 }
 
+async function main(): Promise<number> {
+  const cliArguments = parseCLIArguments(Bun.argv.slice(2));
+  const { options } = cliArguments;
+
+  // -- HELP TEXT -- //
+  if (options.help) {
+    console.log(usage);
+    return ExitCode.Success;
+  }
+
+  // -- ARG VALIDATION -- //
+  if (options.check && options.write) {
+    throw new CLIError("Cannot use --check and --write together");
+  }
+
+  console.log(`Processing ${cliArguments.inputFilePath}`);
+  let lastProcessResult = await processBinding(cliArguments);
+
+  if (options.watch) {
+    const watchDir = fullDirname(cliArguments.inputFilePath);
+    console.log(`Watching ${watchDir} for changes`);
+    const watcher = watch(watchDir, {
+      recursive: true,
+    });
+
+    for await (const event of watcher) {
+      console.log(`Detected ${event.eventType} on ${event.filename}`);
+      lastProcessResult = await processBinding(cliArguments);
+
+      if (lastProcessResult === ExitCode.Error) {
+        console.error(`Error processing ${event.filename}`);
+      } else {
+        console.log("Reprocessed changes");
+      }
+    }
+    return ExitCode.Success;
+  }
+
+  return ExitCode.Success;
+}
+
 try {
   const exitCode = await main();
   process.exit(exitCode);

src/renderers/html.ts

@@ -6,8 +6,8 @@ import type {
   Rule,
   ValidatedPlaybill,
 } from "@proscenium/playbill";
-import { markdownToHtml } from "../markdown";
-import type { PlaybillBinding } from "../binding";
+import { markdownToHtml } from "../filetypes/markdown";
+import type { PlaybillBinding } from "../filetypes/binding";
 import rehypeParse from "rehype-parse";
 import { unified } from "unified";
 import rehypeFormat from "rehype-format";
@@ -132,22 +132,21 @@ async function renderDocument(
 
   let css = "";
 
-  if (binding.html?.stylesheet) {
-    const cssFilePath = path.resolve(
-      binding.bindingFileDirname,
-      binding.html.stylesheet,
-    );
+  if (binding.html?.styles) {
+    for (const style of binding.html.styles) {
+      const cssFilePath = path.resolve(binding.bindingFileDirname, style);
       const cssFile = Bun.file(cssFilePath);
       const cssFileExists = await cssFile.exists();
 
       if (cssFileExists) {
-      css = `<style>
+        css += `<style>
         ${await cssFile.text()}
   </style>`;
       } else {
         throw new FileNotFoundError(cssFilePath);
       }
     }
+  }
 
   return `
 <!doctype html>

src/types.ts

@@ -0,0 +1,5 @@
+import { z } from "zod";
+
+const Renderers = ["json", "html"] as const;
+export const RendererSchema = z.enum(Renderers);
+export type Renderer = "json" | "html";

src/util/files.ts

@@ -1,5 +1,6 @@
 import YAML from "yaml";
-import { FileError, FileNotFoundError } from "./errors";
+import { FileError, FileNotFoundError } from "../errors";
+import path from "node:path";
 
 export async function loadFileOrFail(filePath: string): Promise<string> {
   const fileToLoad = Bun.file(filePath);
@@ -19,3 +20,7 @@ export async function loadYAMLFileOrFail(filePath: string): Promise<unknown> {
     throw new FileError("Failed to parse YAML file", filePath, `${error}`);
   }
 }
+
+export function fullDirname(inputPath: string): string {
+  return path.resolve(path.dirname(inputPath));
+}