feat: remove -f flag from asyncapi start command

docs/usage.md

@@ -38,33 +38,35 @@ USAGE
 # Commands
 
 <!-- commands -->
-* [`asyncapi bundle`](#asyncapi-bundle)
-* [`asyncapi config`](#asyncapi-config)
-* [`asyncapi config analytics`](#asyncapi-config-analytics)
-* [`asyncapi config context`](#asyncapi-config-context)
-* [`asyncapi config context add CONTEXT-NAME SPEC-FILE-PATH`](#asyncapi-config-context-add-context-name-spec-file-path)
-* [`asyncapi config context current`](#asyncapi-config-context-current)
-* [`asyncapi config context edit CONTEXT-NAME NEW-SPEC-FILE-PATH`](#asyncapi-config-context-edit-context-name-new-spec-file-path)
-* [`asyncapi config context init [CONTEXT-FILE-PATH]`](#asyncapi-config-context-init-context-file-path)
-* [`asyncapi config context list`](#asyncapi-config-context-list)
-* [`asyncapi config context remove CONTEXT-NAME`](#asyncapi-config-context-remove-context-name)
-* [`asyncapi config context use CONTEXT-NAME`](#asyncapi-config-context-use-context-name)
-* [`asyncapi config versions`](#asyncapi-config-versions)
-* [`asyncapi convert [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-convert-spec-file-proxyhost-proxyport)
-* [`asyncapi diff OLD NEW`](#asyncapi-diff-old-new)
-* [`asyncapi format [SPEC-FILE]`](#asyncapi-format-spec-file)
-* [`asyncapi generate`](#asyncapi-generate)
-* [`asyncapi generate fromTemplate ASYNCAPI TEMPLATE`](#asyncapi-generate-fromtemplate-asyncapi-template)
-* [`asyncapi generate models LANGUAGE FILE`](#asyncapi-generate-models-language-file)
-* [`asyncapi new`](#asyncapi-new)
-* [`asyncapi new file`](#asyncapi-new-file)
-* [`asyncapi new glee`](#asyncapi-new-glee)
-* [`asyncapi new template`](#asyncapi-new-template)
-* [`asyncapi optimize [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-optimize-spec-file-proxyhost-proxyport)
-* [`asyncapi pretty SPEC-FILE`](#asyncapi-pretty-spec-file)
-* [`asyncapi start`](#asyncapi-start)
-* [`asyncapi start studio`](#asyncapi-start-studio)
-* [`asyncapi validate [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-validate-spec-file-proxyhost-proxyport)
+- [Usage](#usage)
+- [Commands](#commands)
+  - [`asyncapi bundle`](#asyncapi-bundle)
+  - [`asyncapi config`](#asyncapi-config)
+  - [`asyncapi config analytics`](#asyncapi-config-analytics)
+  - [`asyncapi config context`](#asyncapi-config-context)
+  - [`asyncapi config context add CONTEXT-NAME SPEC-FILE-PATH`](#asyncapi-config-context-add-context-name-spec-file-path)
+  - [`asyncapi config context current`](#asyncapi-config-context-current)
+  - [`asyncapi config context edit CONTEXT-NAME NEW-SPEC-FILE-PATH`](#asyncapi-config-context-edit-context-name-new-spec-file-path)
+  - [`asyncapi config context init [CONTEXT-FILE-PATH]`](#asyncapi-config-context-init-context-file-path)
+  - [`asyncapi config context list`](#asyncapi-config-context-list)
+  - [`asyncapi config context remove CONTEXT-NAME`](#asyncapi-config-context-remove-context-name)
+  - [`asyncapi config context use CONTEXT-NAME`](#asyncapi-config-context-use-context-name)
+  - [`asyncapi config versions`](#asyncapi-config-versions)
+  - [`asyncapi convert [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-convert-spec-file-proxyhost-proxyport)
+  - [`asyncapi diff OLD NEW`](#asyncapi-diff-old-new)
+  - [`asyncapi format [SPEC-FILE]`](#asyncapi-format-spec-file)
+  - [`asyncapi generate`](#asyncapi-generate)
+  - [`asyncapi generate fromTemplate ASYNCAPI TEMPLATE`](#asyncapi-generate-fromtemplate-asyncapi-template)
+  - [`asyncapi generate models LANGUAGE FILE`](#asyncapi-generate-models-language-file)
+  - [`asyncapi new`](#asyncapi-new)
+  - [`asyncapi new file`](#asyncapi-new-file)
+  - [`asyncapi new glee`](#asyncapi-new-glee)
+  - [`asyncapi new template`](#asyncapi-new-template)
+  - [`asyncapi optimize [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-optimize-spec-file-proxyhost-proxyport)
+  - [`asyncapi pretty SPEC-FILE`](#asyncapi-pretty-spec-file)
+  - [`asyncapi start`](#asyncapi-start)
+  - [`asyncapi start studio`](#asyncapi-start-studio)
+  - [`asyncapi validate [SPEC-FILE] [PROXYHOST] [PROXYPORT]`](#asyncapi-validate-spec-file-proxyhost-proxyport)
 
 ## `asyncapi bundle`
 
@@ -786,10 +788,12 @@ starts a new local instance of Studio
 
 ```
 USAGE
-  $ asyncapi start studio [-h] [-f <value>] [-p <value>]
+  $ asyncapi start studio [SPEC_FILE] [-h] [-p <value>]
+
+ARGUMENTS
+  SPEC-FILE  spec path, url, or context-name
 
 FLAGS
-  -f, --file=<value>  path to the AsyncAPI file to link with Studio
   -h, --help          Show CLI help.
   -p, --port=<value>  port in which to start Studio
 

src/commands/start/studio.ts

@@ -2,20 +2,38 @@ import Command from '../../core/base';
 import { start as startStudio } from '../../core/models/Studio';
 import { load } from '../../core/models/SpecificationFile';
 import { studioFlags } from '../../core/flags/start/studio.flags';
+import { Args } from '@oclif/core';
 
 export default class StartStudio extends Command {
   static description = 'starts a new local instance of Studio';
 
   static flags = studioFlags();
 
+  static readonly args = {
+    'spec-file': Args.string({ description: 'spec path, url, or context-name', required: false }),
+  };
+
   async run() {
-    const { flags } = await this.parse(StartStudio);
-    const filePath = flags.file || (await load()).getFilePath();
+    const { args, flags } = await this.parse(StartStudio);
+    let filePath = args['spec-file'];
     const port = flags.port;
-
-    this.specFile = await load(filePath);
+    if (!filePath) {
+      try {
+        filePath = ((await load()).getFilePath());
+        this.log(`Loaded specification from: ${filePath}`);
+      } catch (error) {
+        filePath = '';
+        this.log('No file specified.');
+      }
+    }
+    try {
+      this.specFile = await load(filePath);
+    } catch (error) {
+      if (filePath) {
+        this.error(error as Error);
+      }
+    }
     this.metricsMetadata.port = port;
-
     startStudio(filePath as string, port);
   }
 }

src/core/flags/start/studio.flags.ts

@@ -3,7 +3,6 @@ import { Flags } from '@oclif/core';
 export const studioFlags = () => {
   return {
     help: Flags.help({ char: 'h' }),
-    file: Flags.string({ char: 'f', description: 'path to the AsyncAPI file to link with Studio' }),
     port: Flags.integer({ char: 'p', description: 'port in which to start Studio' }),
   };
 };

src/core/models/Studio.ts

@@ -20,31 +20,33 @@
   return existsSync(filePath);
 }
 
 export function start(filePath: string, port: number = DEFAULT_PORT): void {
-  if (!isValidFilePath(filePath)) {
+  if (filePath && !isValidFilePath(filePath)) {
     throw new SpecificationFileNotFound(filePath);
   }
-  chokidar.watch(filePath).on('all', (event, path) => {
-    switch (event) {
-    case 'add':
-    case 'change':
-      getFileContent(path).then((code:string) => {
+  if (filePath) {
+    chokidar.watch(filePath).on('all', (event, path) => {
+      switch (event) {
+      case 'add':
+      case 'change':
+        getFileContent(path).then((code: string) => {
+          messageQueue.push(JSON.stringify({
+            type: 'file:changed',
+            code,
+          }));
+          sendQueuedMessages();
+        });
+        break;
+      case 'unlink':
         messageQueue.push(JSON.stringify({
-          type: 'file:changed',
-          code,
+          type: 'file:deleted',
+          filePath,
         }));
         sendQueuedMessages();
-      });
-      break;
-    case 'unlink':
-      messageQueue.push(JSON.stringify({
-        type: 'file:deleted',
-        filePath,
-      }));
-      sendQueuedMessages();
-      break;
-    }
-  });
+        break;
+      }
+    });
+  }
 
   const server = createServer((request, response) => {
     //not all CLI users use npm. Some package managers put dependencies in different weird places
@@ -71,18 +73,26 @@
 
   wsServer.on('connection', (socket: any) => {
     sockets.push(socket);
-    getFileContent(filePath).then((code: string) => {
+    if (filePath) {
+      getFileContent(filePath).then((code: string) => {
+        messageQueue.push(JSON.stringify({
+          type: 'file:loaded',
+          code,
+        }));
+        sendQueuedMessages();
+      });
+    } else {
       messageQueue.push(JSON.stringify({
         type: 'file:loaded',
-        code,
+        code: '',
       }));
       sendQueuedMessages();
-    });
+    }
 
     socket.on('message', (event: string) => {
       try {
-        const json:any = JSON.parse(event);
-        if (json.type === 'file:update') {
+        const json: any = JSON.parse(event);
+        if (filePath && json.type === 'file:update') {
           saveFileContent(filePath, json.code);
         } else {
           console.warn('Live Server: An unknown event has been received. See details:');
@@ -102,7 +112,13 @@
     const url = `http://localhost:${port}?liveServer=${port}&studio-version=${studioVersion}`;
     console.log(`Studio is now running at ${url}.`);
     console.log(`You can open this URL in your web browser, and if needed, press ${gray('Ctrl + C')} to stop the process.`);
-    console.log(`Watching changes on file ${filePath}`);
+    if (filePath) {
+      console.log(`Watching changes on file ${filePath}`);
+    } else {
+      console.log(
+        'Hint : No file was provided, and we couldn\'t find a default file (like "asyncapi.yaml" or "asyncapi.json") in the current folder. Starting Studio with a blank workspace.'
+      );
+    }
     open(url);
   });
 }