Allow also project files instead of only solutions, fix many bugs

DeleteExcludedFiles.ps1

<#
.SYNOPSIS
Find all files excluded from a Visual Studio solution or project with the option to delete the files.

.DESCRIPTION
Finds all excluded files in all projects in the provided Visual Studio solution or a specific project with the option to delete the files.

.PARAMETER File
The path to the .sln or .csproj file

.PARAMETER Delete
Delete the files directly from the disk

#>

[CmdletBinding()]
param(
    [Parameter(Mandatory=$true)]
    [string]$File,
    [Parameter(Mandatory=$false)] 
    [switch]$Delete
)
$ErrorActionPreference = "Stop"

[Reflection.Assembly]::LoadWithPartialName('System.Web') | Out-Null

$projects = @()
if ($File.ToLower().EndsWith('.sln')) {
	# Search a whole solution
	$solutionDir = Split-Path $File | % { (Resolve-Path $_).Path }
	$projects = Select-String -Path $File -Pattern 'Project.*"(?<file>.*\.csproj)".*' `
	    | % { $_.Matches[0].Groups[1].Value } `
	    | % { Resolve-Path(Join-Path $solutionDir ([System.Web.HttpUtility]::UrlDecode($_))) }
} else {
    # Search a specific project
	$projects = @((Resolve-Path $File))
}
#Write-Host ($projects -join "`n") # For Debugging

Write-Host "=== Processing" $projects.count "projects"
$excluded = $projects | % {
	$projectDir = Split-Path $_
	Write-Host (Split-Path $_ -Leaf)
	
	$projectXml = [xml](Get-Content $_)
	if ($projectXml.DocumentElement.Attributes['Sdk']) {
        # New project type, skip
		Write-Host "=> New project type, skipping"
		return
	}

	$projectFiles = Select-String -Path $_ -Pattern '<(Compile|None|Content|EmbeddedResource|Resource|Page) Include="(.*)".*' `
		| % { $_.Matches[0].Groups[2].Value } `
		| % { Resolve-Path(Join-Path $projectDir ([System.Web.HttpUtility]::UrlDecode($_))) }
	#Write-Host ($projectFiles -join "`n") # For Debugging

	$diskFiles = Get-ChildItem -Path $projectDir -Recurse `
		| ? { !$_.PSIsContainer } `
		| % { $_.FullName } `
		| ? { $_ -notmatch "\\obj\\|\\bin\\|\\logs\\|\.user$|\.*proj$|App_Configuration\\|App_Data\\" }
	#Write-Host ($diskFiles -join "`n") # For Debugging
		
	(compare-object $diskFiles $projectFiles -PassThru) | Where { $_.SideIndicator -eq '<=' }
} 

Write-Host "=== Found" $excluded.count "excluded files"

if ($Delete)
{
	Write-Host "Deleting excluded files from disk..."
	$excluded | % { Write-Host $_; Remove-Item -Path $_ -Force}
}
else 
{
	Write-Host "Delete was not specified. Listing excluded files only..."
	$excluded
}