v/doc/vscode.md

# Visual Studio Code Setup

## Table of Contents

* [V language support](#v-language-support)
* [Visual Debugging](#visual-debugging)

## V language support

The [V VS Code Extention](https://marketplace.visualstudio.com/items?itemName=vlanguage.vscode-vlang)
provides V language support for Visual Studio Code.

![Screenshot Code with activated extention](https://github.com/vlang/vscode-vlang/raw/HEAD/images/demo.png)

**Features:**
* Syntax Highlighting.
* Code Snippets for quick coding.
* Format code on file save as well as format manually (using v fmt).
* Linter (Workspace files only).
[more](https://marketplace.visualstudio.com/items?itemName=vlanguage.vscode-vlang)

**Hint:** This extension will not add the V compiler! Information on how to
[install V compiler](https://github.com/vlang/v/blob/master/doc/docs.md#install-from-source)
on your operating system.

### Setup Extension

Install [V VS Code Extension](https://marketplace.visualstudio.com/items?itemName=vlanguage.vscode-vlang).

## Visual Debugging

![screenshot visual debugger](https://github.com/vlang/v/blob/master/doc/img/vscode-debugger.png?raw=true)

The [C/C++ Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools)
for Visual Studio Code provides visual conditional debugging.

**Features:**
* Conditional breakpoints
* Function breakpoints
* Expression evaluation
* Change Values
[more Features & Documentation](https://code.visualstudio.com/docs/cpp/cpp-debug)

**Hint:** Not all types (e.g. Array) in V currently create the required
[DWARF](https://en.wikipedia.org/wiki/DWARF) information to show and 
edit the variable.

### Setup Debugging

1. Install the [C/C++ Extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode.cpptools)
2. Open `RUN AND DEBUG` panel (Debug Icon in left panel).
3. Click on `Show` all automatic debug configurations.
4. Select `Add config`.
5. Select environment `C++ (GDB/LLDB)`.
6. Change the line `"program": "Enter the program name, e.g. \"${workspaceFolder}/a.out\"",`
to point to your compiled application e.g. `"program": "${workspaceFolder}/hello",`.

This will add a block to your `.workspace` file,
or create the file `.vscode/launch.json`:
```json
{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: 
	// https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(lldb) Start",
            "type": "cppdbg",
            "request": "launch",
            "program": "Enter the program name, e.g. \"${workspaceFolder}/a.out\"",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "lldb"
        }
    ]
}
```

**Optional:** use `"program": "${fileDirname}/${fileBasenameNoExtension}"` to debug 
any current open source file with an existing binary with the same name but without any extension.

### Usage

To allow your compiled application to be debugged.
The application needs to include additional debugging information
([DWARF](https://en.wikipedia.org/wiki/DWARF)).

**1. Compile with debugging information:**
`v -b c -g hello.v -o hello` or short `v -g hello.v`

The `-g` option will add the needed debugging informations.
More Options are explained in the [docs](docs.md#debugging).


**2. Start Debugging**

1. Open your source code and set the required break points
2. Click on the Debug Icon in the left Icon panel and click
`> (lldb) Start`, or use `F5` to launch your application in debug mode.

For all options look at the official 
[C/C++ Extension documentation](https://code.visualstudio.com/docs/cpp/cpp-debug).