WSLTabCompletion

A PowerShell module which includes a .Net ArgumentCompleter for the native wsl.exe command, used to launch and manage the Windows Subsystem for Linux.

Features

• Completes all commands and (most) flags for the current release of WSL (1.2.5)
• Provides tooltip help (at the bottom of the screen) for the offered completions.
• Completes all installed distribution names for the -d/--distribution, --export, --terminate, --set-default, --set-version, and --unregister options.
• Provides additional information on the distributions being offered for completion in the tooltip - Whether or not the instance is running or stopped and the WSL version of the instance. Also tags the default distribution.
• Only offers running distributions for completion for --terminate
• When completing for the -u/--user option, offers root and the contents of the $env:defaultWSLUser environment variable (if it exists)
• Offers the undocumented ~ option for launching the instance in the user's home directory.
• Attempts to only offer completions that make sense given the current command line so far, but there will be corner cases it cannot catch without building a full AST parser for the wsl command, which I have no plans to do ;-).
• Falls back to offering the default PowerShell directory/file completion for flags where this makes sense.
• Does not offer any completions when the input must be provided by the user (e.g. the name to provide a new instance when doing an --import)

Limitations

Best results under PowerShell Core.

Windows PowerShell (the version installed with Windows by default) does not offer completions for arguments starting with -. This makes the feature fairly limited there. Since Windows PowerShell is end-of-life, Microsoft has no plans to fix this.

At present, I have not tested older versions of PowerShell Core to see how far back it works. Please let me know if you find an issue on an older PowerShell Core version. I probably won't fix it, but I can at least update the manifest to suggest a later release.

Installation

WSLTabCompletion is published in the PowerShell Gallery. To install:

Install-Module -Name WSLTabCompletion

Once installed, test it in a single PowerShell session with:

Import-Module WSLTabCompletion

Type wsl (including a trailing space) and then hit Tab or Ctrl+Space to see available completions. Try completing wsl -d (including the trailing space) to get a list of installed WSL instances.

Once you have tested it, add the above Import-Module line to your PowerShell Core profile so that it is available in all PowerShell Core instances.

code $PROFILE or notepad $PROFILE:

# Recommended for Completion system to provide tooltips
Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete
# Recommended for PowerShell to exit with Ctrl+D (like Linux shells)
Set-PSReadlineKeyHandler -Key ctrl+d -Function DeleteCharOrExit

#Required for WSLTabCompletion
Import-Module WSLTabCompletion

# Nice-to-have for history search
Set-PSReadlineKeyHandler -Key UpArrow -Function HistorySearchBackward
Set-PSReadlineKeyHandler -Key DownArrow -Function HistorySearchForward

Update with:

Update-Module WSLTabCompletion

### License ###

This module is provided under the terms of the GPLv3.  You can freely use it on any system you control; you may freely distribute it under the terms of the GPLv3.  To distribute under other terms, please contact the author by filing an [issue](https://github.com/NotTheDr01ds/WSLTabCompletion/issues).

### Implementation notes ###

* The `wsl.exe` command currently appears to output in a (likely [malformed](https://github.com/microsoft/WSL/issues/4456#issuecomment-526807466)) UTF16 character set.  I am using [this](https://github.com/microsoft/WSL/issues/4607#issuecomment-717876058) incredibly helpful workaround by falloutphil.  However, I have not tested this on other locales.  Please file an issue if you run into any problem that appears to be due to character-encoding (or any other problem, of course).