Enables Slack Dark Mode for versions 3.4.1 and later

Set-SlackDark.ps1

# Author: Colin Andress
# Modified by: adilio
# Github Link: https://github.com/Column01
Write-Output 'Getting Windows User and Slack version'
$user = $env:UserName
if (Test-Path -Path "C:\Users\$user\AppData\Roaming\Slack\storage\slack-settings") {
    $json = Get-Content "C:\Users\$user\AppData\Roaming\Slack\storage\slack-settings" | Out-String | ConvertFrom-Json
}
else {
    Write-Output 'Unable to find the slack version info. Is slack installed from the windows store? Make sure it is from the slack website!'
    exit
}
$version = $json.appVersion
Write-Output "Windows username: $user"
Write-Output "Slack Version: $version"
if ($user) {
    Write-Output 'Moving to slack install location'
    Set-Location "C:\Program Files\Slack\resources\app.asar.unpacked\src\static"
    Write-Output 'Renaming the old ssb-interop.js to OLDssb-interop.js to preserve it in case of an error (rename it to the normal name to revert changes)'
    try {
        Rename-Item -Force -ErrorAction 'Stop' -Path 'ssb-interop.js' -NewName 'OLDssb-interop.js'
    }
    catch {
        Write-Output 'Backed up file exists... Updating the backup copy to the current ssb-interop.js'
        Remove-Item -Path 'OLDssb-interop.js'
        Rename-Item -Force  -Path 'ssb-interop.js' -NewName 'OLDssb-interop.js'
    }
    Write-Output 'Downloading modified ssb-interop.js from Github and placing it in the correct folder'
    Invoke-WebRequest https://raw.githubusercontent.com/caiceA/slack-black-theme/master/ssb-interop.js -O ssb-interop.js;
    Write-Output 'Download and install complete. Restart slack to apply the changes!'
    Write-Output 'Exiting script in 3 seconds.'
    Set-Location ~
    Start-Sleep -Seconds 3
    exit
}