Format APEX code Visual Studio code

You can use uncrustify with VS Code. You need to install the code on your platform (http://uncrustify.sourceforge.net/), and then search for "uncrustify" in VS Code Extensions.

Next, be sure to add this configuration setting. Then the Format Document command and keys will work with Salesforce Apex. I believe you can also accomplish the same thing with the Java language support, but this is working for me.

{    "uncrustify.langOverrides": {
        "apex": "JAVA"
    }
}

I've written up a more detailed howto at https://vernonkeenan.com/index.php/2018/10/13/salesforce-apex-beautified/.

I assume that OP means the part of VS Code that determines standard formatting for Apex files.

If you have Salesforce Extensions installed, typing SHIFT+ALT+F will give an error message:

There is no formatter for 'apex-'-files installed.

Hopefully this will be updated as the SFDX VS project continues but as far as I can see there is no extension that provides this.

Personally, I use the following extensions for vscode:

1. Salesforce Extensions for VS Code - A package of Salesforce made extensions for editing code. Provides syntax highlighting & will recognize salesforce files based on their extension. Pretty much a must have for working with sfdx.
2. Apex PMD - provides a tool to analyze code based on a ruleset. Comes with its own ruleset based on java best practices. Useful tool for new developers or old developers working with a codebase which could use a tuneup. It can be modified further to fit your needs.

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I asked about supporting an official formatter & was told that it was supported, via a version of prettier. Details can be found here:

https://developer.salesforce.com/tools/vscode/en/user-guide/prettier

Installation

To install the Prettier Apex plugin:

1. Navigate to the top-level of your project

2. Check if your project contains the package.json file. If not, run: npm init and accept all the default options.

3. Run: npm install --save-dev --save-exact prettier prettier-plugin-apex.

You must create a configuration file .prettierrc in the root of your project. If you’d like to know more about formatting options of Prettier, read other config options.

{
  "trailingComma": "none",
  "overrides": [
    {
      "files": "**/lwc/**/*.html",
      "options": { "parser": "lwc" }
    },
    {
      "files": "*.{cmp,page,component}",
      "options": { "parser": "html" }
    }
  ]
}

NOTE: The "trailingComma": "none" setting is required for Aura.

After creating the local configuration file, install the Prettier extension for VS Code.

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I'd install the Salesforce extensions for vscode, or some of the individual components. They provide hinting and syntax features which make editing files much easier.

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2020: Mavensmate is no longer around. The Salesforce provided extensions work well with SFDX and should meet any other need you have. There is no formatter included in the sfdx package.