Removing duplicate entries in NuGet packages.config

dedupe.ps1

# Paste this entire script into NuGet Package Manager Console with an open solution in Visual Studio.
# This script will locate projects with duplicate dependencies in packages.config and remove them.

Function Get-Duplicate {
    param([Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]$array, [switch]$count)
    begin {
        $hash = @{}
    }
    process {
        $array | %{ $hash[$_] = $hash[$_] + 1 }
        if($count) {
            $hash.GetEnumerator() | ?{$_.value -gt 1} | %{
                New-Object PSObject -Property @{
                    Value = $_.key
                    Count = $_.value
                }
            }
        }
        else {
            $hash.GetEnumerator() | ?{$_.value -gt 1} | %{$_.key}
        }
    }
}

Get-Project -All | ForEach-Object {
	$ProjectName = $_.ProjectName
	$ProjectPackages = Get-Package -ProjectName $ProjectName
	if ($ProjectPackages) {
		$Dupes = Get-Duplicate ($ProjectPackages | ForEach-Object { $_.Id })
		if (!$Dupes) {
			Write-Host "No dupes found in $ProjectName"
		}
		else
		{
			ForEach ($Dupe in $Dupes) {
				$First = $ProjectPackages | Where-Object { $_.Id -eq $Dupe } | Select-Object -First 1
				# Note NuGet 2.0.30625.9003 happily ignores the version flag and uninstalls whatever the fuck it feels like.
				Uninstall-Package -ProjectName $ProjectName -Id $($First.Id) -Version $($First.Version) -Force
			}
		}
	}
}