Download and install the Node.js framework. The framework is required for two reasons:
- The Stylus transpiler is started through Node.js.
- The Node Package Manager (npm), which is a part of the framework, is also the easiest way to download the transpiler.
For details on using Node.js in PyCharm, see the section Node.js
Make sure the following paths are added to the PATH variable:
- The path to the parent folder of the Node.js executable file.
- The path to the Node Package Manager folder (npm).
Install and enable the NodeJS repository plugin.
The plugin is not bundled with PyCharm, but it is available from the PyCharm plugin repository. Once enabled, the plugin is available at the IDE level, that is, you can use it in all your PyCharm projects.
Installing the Stylus transpiler
The easiest way to install a Stylus transpiler is to use the Node Package Manager (npm), which is a part of Node.js. Depending on the desired location of the Stylus transpiler executable file, choose one of the following methods:
- Install the transpiler globally at the PyCharm level so it can be used in any PyCharm project.
- Install the transpiler in a specific project and thus restrict its use to this project.
In either installation mode, make sure that the parent folder of the Stylus transpiler is added to the PATH variable. This enables you to launch the transpiler from any folder.
Global installation makes the transpiler available at the PyCharm level so it can be used in any PyCharm project. To install the transpiler globally, run the installation from the command line in the global mode.
- Switch to the directory where the Node Package Manager (npm) is stored or define a path variable for it so it is available from any folder.
Type the following command at the command line prompt:
npm install -g stylus
The -g key makes the Node Package Manager (npm) run in the global mode. Because the transpiler is installed through the Node Package Manager (npm), the Stylus transpiler is installed in the npm folder. Make sure this parent folder is added to the PATH variable. This enables you to launch the transpiler from any folder.
Installing the transpiler in a specific project restricts its use to this project. To run project installation, do one of the following:
In the command line mode, switch to the project root folder and type the following command at the command line prompt:
npm install stylus
Run the Node Package Manager (npm) from PyCharm using the Node.js page of the Settings dialog box.
- On the Node.js page that opens, the Packages area shows all the Node.js-dependent packages that are currently installed on your computer, both at the global and at the project level. Click Install. In the Available Packages dialog box that opens, select the stylus package and click Install Package.
Project level installation is helpful and reliable in template-based projects of the type Node Boilerplate or Node.js Express, which already have the node_modules folder. The latter is important because the Node Package Manager installs the Stylus transpiler in a node_modules folder. If your project already contains such folder, the Stylus transpiler is installed there.
Projects of other types or empty projects may not have a node_modules folder. In this case npm goes upwards in the folder tree and installs the Stylus transpiler in the first detected node_modules folder. Keep in mind that this detected node_modules folder may be outside your current project root.
Finally, if no node_modules folder is detected in the folder tree either, the folder is created right under the current project root and the Stylus transpiler is installed there.
In either case, make sure that the parent folder of the Stylus transpiler is added to the PATH variable. This enables you to launch the transpiler from any folder.
PyCharm provides a common procedure and user interface for creating File Watchers of all types. The only difference is in the predefined templates you choose in each case.
- Make sure the File Watchers plugin is enabled. The plugin is bundled with PyCharm and activated by default. If it is not, enable the plugin.
- To start creating a File Watcher, open the Project Settings and click File Watchers. The File Watchers page that opens, shows the list of File Watchers that are already configured in the project.
- Click the Add button or press Alt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+InsertAlt+Insert or Ctrl+NAlt+InsertCommand N or Control EnterControl N or Control EnterCommand N or Control Enter and choose the Stylus predefined template from the pop-up list.
In the Program text box, specify the path to the executable file:
- stylus for Mac OS and Unix.
- stylus.bat for Windows.
- Proceed as described on page Using File Watchers.
Transpiling the code
When you open a Stylus file, PyCharm checks whether an applicable file watcher is available in the current project. If such file watcher is configured but disabled, PyCharm displays a pop-up window that informs you about the configured file watcher and suggests to enable it.
If an applicable file watcher is configured and enabled in the current project, PyCharm starts it automatically upon the event specified in the New Watcher dialog.
- If the Immediate file synchronization check box is selected, the File Watcher is invoked as soon as any changes are made to the source code.
- If the Immediate file synchronization check box is cleared, the File Watcher is started upon save ( , Ctrl+SCtrl+SCtrl+SCtrl+SCtrl+X, Ctrl+SCtrl+SCtrl+S or Ctrl+Shift+SCtrl+SCommand SCommand SCommand S) or when you move focus from PyCharm (upon frame deactivation).
PyCharm creates a separate file with the generated output. The file has the name of the source Stylus file and the extension css. The location of the generated files is defined in the Output paths to refresh text box of the New Watcher dialog. However, in the Project Tree, they are shown under the source file which is now displayed as a node.