Replace cat with bat in PowerShell (and my personal bat config file)

bat.ps1

# This is to replace PowerShell's 'cat' with 'bat'. Install from here: https://github.com/sharkdp/bat
#
# This code goes into my $profile. If you put this into a separate file, you will need to dot source
# that file so that the function shows up in the global namespace. I only replace the cat alias,
# so Get-Content still performs its standard behavior.
#
# I use a pipeline to capture all the file content (so you can do things like `dir *.ps1 | cat` as well
# as `cat *.ps1`). If there's a single file, then the contents are displayed raw; if there are multiple files,
# then it uses bat's header to discriminate the content of multiple files from each other. I also replicated
# a few of the more common (for me) command line switches that I'd want to use to influence bat's behavior,
# including paging support.
#
# I've added the config file I use below to add a few common file types for me with syntax maps.
# See `bat --config-file` for the location of your config file.

$batSource = (get-command bat).Source
if ($null -ne $batSource) {
  if (test-path alias:/cat) { remove-item -force alias:/cat }

  function cat {
    param(
      [Parameter(Mandatory,ValueFromPipeline)][System.IO.FileInfo[]]$Path,
      [switch]$Diff,
      [string]$Language,
      [string][ValidateSet("unicode","caret")]$NonPrintableNotation,
      [string][ValidateSet("auto","always","never")]$Paging,
      [switch]$ShowAll,
      [string[]][ValidateSet("default","full","auto","plain","changes","header","header-filename","header-filesize","grid","rule","numbers","snip")]$Style
    )

    begin {
      $batArgs = [System.Collections.ArrayList]@()
    }
    process {
      $Path | ForEach-Object {
        $fullPath = Resolve-Path $_ -ErrorAction Continue
        if ($null -ne $fullPath) {
          $batArgs.AddRange([Array]$fullPath)
        }
      }
    }
    end {
      if ($batArgs.Count -eq 0)         { return }
      if ($batArgs.Count -gt 1)         { $batArgs.AddRange(@("--style", "header-filename,grid")) }
                                   else { $batArgs.AddRange(@("--style", "plain")) }
      if ($Diff)                        { $batArgs.Add("--diff") }
      if ("" -ne $Language)             { $batArgs.AddRange(@("--language", $Language)) }
      if ("" -ne $NonPrintableNotation) { $batArgs.AddRange(@("--nonprintable-notation", $NonPrintableNotation)) }
      if ("" -ne $Paging)               { $batArgs.AddRange(@("--paging", $Paging)) }
      if ($ShowAll)                     { $batArgs.Add("--show-all") }
      if ($Style.Count -gt 0)           { $batArgs.AddRange(@("--style", [string]::Join(",", $Style))) }

      & $batSource $batArgs
    }
  }
}

config

--map-syntax "*.csproj:XML"
--map-syntax "*.fsproj:XML"
--map-syntax "*.nuspec:XML"
--map-syntax "*.props:XML"
--map-syntax "*.targets:XML"
--map-syntax "*.vbproj:XML"
--paging never
--tabs 4
--theme="GitHub"