Extract MuseScore score and parts to PDF

ConvertFrom-MuseScore.ps1

<#
.SYNOPSIS
Convert MuseScore file to PDF.  Files are output to current folder.

.EXAMPLE
mkdir PDF; cd PDF
Get-ChildItem -File -LiteralPath '..' -Filter '*.mscz' | ForEach-Object { ConvertFrom-MuseScore -Extract Parts -File $_.FullName }
#>
function ConvertFrom-MuseScore {
    param(
        # Path to .mscz file
        [Parameter(Mandatory)][string]$File,
        # What to extract
        [ValidateSet('Score', 'ScoreAndParts', 'ScoreAudio', 'Parts', IgnoreCase)]
        [string[]]$Extract = @('Score', 'Parts'),
        # Path to MuseScore. Defaults to standard install location.
        [string]$MuseScorePath = (Join-Path "$env:ProgramFiles" 'MuseScore 4\bin\MuseScore4.exe')
    )

    # https://github.com/musescore/MuseScore/issues/22887
    # --export-score-parts / -P CLI options no longer work in 4.x #22887

    $path = Resolve-Path -LiteralPath $File

    Write-Host ('Processing "{0}"...' -f (Split-Path -Path $path -Leaf))

    Write-Host '* Extracting JSON'
    $musescoreJsonFile = 'musescore-score-parts.json'
    $process = Start-Process -Wait -NoNewWindow -PassThru `
        -WorkingDirectory (Get-Location).Path `
        -FilePath """$MuseScorePath""" `
        -ArgumentList '--score-parts-pdf', """$path""", '--export-to', """$musescoreJsonFile"""
    if ($process.ExitCode -ne 0) {
        Write-Warning "ExitCode=$($process.ExitCode)"
    }

    $musescoreJson = Get-Content $musescoreJsonFile | ConvertFrom-Json
    $name = Split-Path -LeafBase $musescoreJson.score

    if ('ScoreAndParts' -in $Extract) {
        # --score-parts-pdf CLI option outputs double base64-encoded JSON string for .scoreFullBin field #28436
        # https://github.com/musescore/MuseScore/issues/28436
        $filename = $name + ' [Score and Parts].pdf'
        Write-Host "* Extracting score and parts ""$filename"""
        $base64string = [Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($musescoreJson.scoreFullBin))
        Set-Content -LiteralPath $filename -AsByteStream -Value ([Convert]::FromBase64String($base64string))
    }

    if ('Score' -in $Extract) {
        $filename = $name + ' [Score].pdf'
        Write-Host "* Extracting score ""$filename"""
        Set-Content -LiteralPath $filename -AsByteStream -Value ([Convert]::FromBase64String($musescoreJson.scoreBin))
    }

    if ('Parts' -in $Extract) {
        for ($i = 0; $i -lt $musescoreJson.parts.Count; $i++) {
            $partname = $musescoreJson.parts[$i]
            $filename = '{0} [{1}].pdf' -f (Split-Path -LeafBase $name), $partname
            Write-Host "* Extracting part ""$filename"""
            Set-Content -LiteralPath $filename -AsByteStream -Value ([Convert]::FromBase64String($musescoreJson.partsBin[$i]))
        }
    }

    Remove-Item -LiteralPath $musescoreJsonFile

    if ('ScoreAudio' -in $Extract) {
        $filename = $name + '.mp3'
        Write-Host "* Extracting audio ""$filename""..."
        $process = Start-Process -Wait -NoNewWindow -PassThru `
            -WorkingDirectory (Get-Location).Path `
            -FilePath """$MuseScorePath""" `
            -ArgumentList """$path""", '--export-to', """$filename"""
        if ($process.ExitCode -ne 0) {
            Write-Warning "ExitCode=$($process.ExitCode)"
        }
    }
}