A fancy PowerShell prompt function that should work cross-platform. See script comments for more information.

BoxPrompt.ps1

#requires -version 5.1

<#
Create a lined box with user and location information. The line color will indicate if the user is running elevated.
The prompt will also display the current date and time and a PS prompt with the PowerShell version.

┌─────────────────────────┐
│ [BOVINE320\Jeff] D:\iso │
└─────────────────────────┘
[01/18/2019 09:30:53] PS v6.1.2>

This prompt should run cross platform, although Linux testing has been limited.

To use the prompt dot source the script file in your PowerShell profile script.

This may not display properly in the Visual Studio Code PowerShell integrated console
#>

Function prompt {

    if ($env:userdomain -AND $env:username) {
        $me = "$($env:userdomain)\$($env:username)"
    }
    elseif ($env:LOGNAME) {
        $me = $env:LOGNAME
    }
    else {
        $me = "PSUser"
    }
    $text = "[$me] $($executionContext.SessionState.Path.CurrentLocation)"

    if ($IsLinux) {
        if ($(id -g) -eq 0 ) {
            #running as SU
            $lineColor = "Red"
        }
        else {
            $lineColor = "Green"
        }
    }
    elseif ($isWindows -or $psEdition -eq 'desktop') {

        $IsAdmin = [System.Security.Principal.WindowsPrincipal]::new([System.Security.Principal.WindowsIdentity]::GetCurrent() ).IsInRole("Administrators")
        if ($IsAdmin) {
            $lineColor = "Red"
        }
        else {
            $lineColor = "Green"
        }
    }
    else {
        #for everything else not tested
        $lineColor = "Yellow"
    }

    $top = "┌$(("─" * $($text.length+2)))┐"
    Write-Host $top -ForegroundColor $lineColor
    Write-Host "│ " -ForegroundColor $lineColor -NoNewline
    Write-Host $text -NoNewline
    Write-Host " │" -ForegroundColor $lineColor
    $bottom = "└$(("─" * $($text.length+2)))┘"
    Write-Host $bottom -ForegroundColor $lineColor

    #parse out the PSVersionTable to most meaningful values
    $ver = $(([regex]"\d+\.\d+.\d+").match($psversiontable.psversion).value)

    Write-Host "[$(Get-Date)]" -ForegroundColor Yellow -NoNewline
    #the prompt function needs to write something to the pipeline
    " PS v$ver$('>' * ($nestedPromptLevel + 1)) "

}

This function is described at https://jdhitsolutions.com/blog/powershell/6439/friday-fun-with-a-cross-platform-powershell-prompt/