Create Custom Language in Visual Studio Code

It’s possible with the new version 0.9.0. There’s an official documentation on how to add a custom language: https://github.com/microsoft/vscode-docs/blob/main/release-notes/v0_9_0.md

You need a .tmLanguage file for the language you want to add. You can find existing files e.g. on GitHub or you can define your own language file. Look here to get an idea of how to create one: http://manual.macromates.com/en/language_grammars

After finding a .tmLanguage file you have two ways to create an extension based on it.

Option 1: Using a Yeoman generator

• Install node.js (if you haven’t already done)
• Install yo (if you haven’t already done) by executing npm install -g yo
• Install the Yo generator for code: npm install -g generator-code
• Run yo code and select New language support
• Follow the instructions (define the .tmLangauge file, define the plugin name, file extensions etc.)
• The generator creates a directory for your extension with the name of the plugin in your current working directory.

Option 2: Create the directory on your own

• Create a directory with the name of your plugin (only lowercase letters). Let’s say we call it mylang.

• Add a subfolder syntaxes and place the .tmlanguage file inside of it

• Create a file package.json inside the root of the extension folder with content like this

   {
       "name": "mylang",
       "version": "0.0.1",
       "engines": {
           "vscode": ">=0.9.0-pre.1"
       },
       "publisher": "me",
       "contributes": {
           "languages": [{
               "id": "mylang",
               "aliases": ["MyLang", "mylang"],
               "extensions": [".mylang",".myl"]
           }],
           "grammars": [{
               "language": "mylang",
               "scopeName": "source.mylang",
               "path": "./syntaxes/mylang.tmLanguage"
           }]
       }
   }
  

Finally add your extension to Visual Studio Code

Copy the extension folder to the extension directory. This is:

• on Windows %USERPROFILE%\.vscode\extensions

• on Mac/Linux $HOME/.vscode/extensions

Restart Code. Now your extension will run automatically everytime you open a file with the specified file extension. You can see the name of the used plugin in the down right corner. You can change it by clicking on the name of the extension. If your extension is not the only one registered for a specific file extension then Code may chooses the wrong one.