.\profile.ps1

function Prompt {
    Write-Host # one blank line

    # 1. pwd   
    $pwdArray = $($pwd.path -replace ':', '').split('\')
    if ($pwdArray.count -gt 3) {
        $linuxPath = "/$($pwdArray[0], '...', $pwdArray[-2], $pwdArray[-1] -join ('/'))"
    } else {
        $linuxPath = "/$($pwdArray -join ('/'))"
    }
    write-host $linuxPath -ForegroundColor Cyan -NoNewline
    
    # 2. git status
    if (Get-Module Posh-git) {
        $vcsStatus = Write-VcsStatus
        write-host $vcsStatus -NoNewline
    }
    
    # 3. get command execution time
    $history = Get-History -ErrorAction Ignore -Count 1
    if ($history) {
        $elapsedTime = " "
        $ts = New-TimeSpan $history.StartExecutionTime $history.EndExecutionTime
        switch ($ts) {
            { $_.TotalSeconds -lt 1 } { 
                [int]$d = $_.TotalMilliseconds
                $elapsedTime += '{0}ms' -f ($d) 
                break
            }
            { $_.totalminutes -lt 1 } { 
                [int]$d = $_.TotalSeconds
                $elapsedTime += '{0}s' -f ($d) 
                break
            }
            { $_.totalminutes -ge 1 } { 
                $elapsedTime += "{0:HH:mm:ss}" -f ([datetime]$ts.Ticks) 
                break
            }
            Default {
                $elapsedTime += '{0}ms' -f ($d) 
            }
        }
        $elapsedTime += " "
    }

    # 4. check if admin
    $currentUser = [Security.Principal.WindowsPrincipal](
        [Security.Principal.WindowsIdentity]::GetCurrent())
    $isAdminProcess = $currentUser.IsInRole(
        [Security.Principal.WindowsBuiltInRole]::Administrator) 
    $adminHeader = if ($isAdminProcess) { ' Admin ' } else { " $env:USERNAME " } 
    
    # 5. time
    $now = get-date -format " HH:mm:ss "

    # 6. align right: elapsedTime, adminHeader, now
    $rightInfo = "$elapsedTime$adminHeader$now  "
    $startposx = $Host.UI.RawUI.windowsize.width - $rightInfo.length
    $startposy = $Host.UI.RawUI.CursorPosition.Y
    $Host.UI.RawUI.CursorPosition = New-Object System.Management.Automation.Host.Coordinates $startposx,$startposy
    
    if ($elapsedTime.length -ne 0) {
        write-host $elapsedTime -ForegroundColor Black -NoNewline -BackgroundColor DarkYellow
    }
    write-host $adminHeader -ForegroundColor Black -NoNewline -BackgroundColor DarkGreen
    write-host $now -ForegroundColor Gray -NoNewline  -BackgroundColor Red
    
    # 8. prompt arrow
    if ($host.UI.RawUI.CursorPosition.X -gt 0) { Write-Host }    
    "$([char]0x2192) "
}

Import-Module posh-git

# Blog posting
# https://jusths.tistory.com/180
# https://jusths.tistory.com/181

# References
# http://www.nichesoftware.co.nz/2018/02/10/powershell-prompt.html
# http://joonro.github.io/blog/posts/powershell-customizations/

# UNICODE
# https://unicode-table.com/kr/sets/arrow-symbols/