# Environment setup

 Please download the program package from the official website. There are two files in the package, one `bt` program and one `bt_app` program.

- `bt` is a BT language interpreter, used to compile and run BT language programs.
- `bt_app` is a BT desktop application engine (built-in BT language interpreter) for desktop software development.

 If you need to develop Web projects and API interfaces, you only need `bt`. If you need to develop desktop application projects, you only need `bt_app`.

According to the type of project you develop, put the program into the root directory of the project to complete the environment setup. Next, you only need to have a simple notepad. However, in order to write code more happily, the official recommendation:

## Code editor:
`VS Code` + `bt-lang extension`: [open the bt-lang extension](vscode:extension/bt-lang.bt-lang) directly in VS Code.

### bt-lang extension support:

- Support BT language keywords, functions, strings, etc. highlighting
- Intelligent code completion and context-aware completion
- Display the parameter list and current parameter position when calling a function
 - Display complete description, parameter and return value information when the mouse hovers over a function
 - Support cross-file function jumps to quickly locate definition locations
 - Automatically scan and index functions in all BT files
 - Automatically identify and parse function definitions in include files
 - Display the function structure of the current file in the sidebar
 - Support system function prompts and automatic completion
 - Quickly execute the BT program in the current workspace

## Other editors:
- `HBuilderX` + `bt-lang extension`: [install it from the HBuilderX plugin marketplace](https://ext.dcloud.net.cn/plugin?id=20669).
- `Sublime Text` + `bt-lang extension`: [download it from GitHub](https://github.com/bt-lang/editor-extensions/tree/main/SublimeText) and place it under `[installation directory\Data\Packages]`.