internal/Invoke-DbaDiagnosticQueryScriptParser.ps1

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function Invoke-DbaDiagnosticQueryScriptParser
{
[CmdletBinding(DefaultParameterSetName="Default")] 

Param(
    [parameter(Mandatory = $true)]
    [ValidateScript({Test-Path $_})]
    [System.IO.FileInfo]$filename
    )

    $out = "Parsing file {0}"-f $filename
    write-verbose -Message $out

    $ParsedScript = @()
    [string]$scriptpart = ""

    $fullscript = Get-Content -Path $filename

    $start = $false
    $querynr = 0
    $DBSpecific = $false

    foreach($line in $fullscript)
    {
        if ($start -eq $false)
        {
            if ($line -match "You have the correct major version of SQL Server for this diagnostic information script")
            {
                $start = $true
            }
            continue
        }

        if ($line.StartsWith("-- Database specific queries ***") -or ($line.StartsWith("-- Switch to user database **")))
        {
            $DBSpecific = $true
        }

        if ($line -match "-{2,}\s{1,}(.*) \(Query (\d*)\) \((\D*)\)")
        {
            $prev_querydescription = $Matches[1]
            $prev_querynr = $Matches[2]
            $prev_queryname = $Matches[3]

            if ($querynr -gt 0)
            {
                $properties = @{QueryNr = $querynr; QueryName = $queryname; DBSpecific = $DBSpecific; Description = $queryDescription; Text = $scriptpart}
                $newscript = New-Object -TypeName PSObject -Property $properties
                $ParsedScript += $newscript
                $scriptpart = ""
            }

            $querydescription = $prev_querydescription 
            $querynr = $prev_querynr 
            $queryname = $prev_queryname
        }
        else
        {
            if (!$line.startswith("--") -and ($line.trim() -ne "") -and ($null -ne $line) -and ($line -ne "\n"))
            {
                $scriptpart += $line + "`n"           
            }
        }
    }

    $ParsedScript
}