Appends a GPLv3 liecense notice to the top of every C# source file

appendNotice.ps1

$comment = @"
/*
    This file is part of [PROJECT] (Copyright © [YEAR]  [AUTHOR]).
    [PROJECT] is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
    [PROJECT] is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
    You should have received a copy of the GNU General Public License along with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/


"@

$files = Get-ChildItem -Path . -Filter *.cs -Recurse

foreach ($file in $files) {
    # Read the content of the file
    $content = [System.IO.File]::ReadAllText($file.FullName)

    # Prepend the comment to the content
    $newContent = $comment + $content

    # Create a StreamWriter with UTF8 encoding (no BOM)
    $streamWriter = New-Object System.IO.StreamWriter($file.FullName, $false, [System.Text.Encoding]::UTF8)

    # Write the new content back to the file using the StreamWriter
    $streamWriter.Write($newContent)

    # Close the StreamWriter
    $streamWriter.Close()
}