posh-git add last command duration

profile.ps1

# Might not work before Powershell 7   (`$PSVersionTable`)
# Might not work before Posh-Git v1 (https://github.com/dahlbyk/posh-git#installing-posh-git-via-powershellget-on-linux-macos-and-windows)
#
# Find this file's path by running `$Profile`

Import-Module posh-git

$begin = (Get-Date)

function Prefix {
    function SignificantDigits3 ($value) {
        $abs = [Math]::Abs($value)

        if (10 -gt $abs) {
            ('{0:N2}' -f $value).TrimEnd('0')
        } elseif (100 -gt $abs) {
            ('{0:N1}' -f $value).TrimEnd('0')
        } else {
            ('{0:N0}' -f $value)
        }
    }

    if ($null -eq (Get-History) -or $null -eq (Get-History)[-1]) { 
        $since = $begin - (Get-Date)
        
        if ($since.TotalSeconds -gt -120)  {
            '{0,-5} ' -f ('{0:N0}s' -f $since.TotalSeconds)
        } else  {
            '{0,-5} ' -f ('{0:N0}m' -f $since.TotalMinutes)
        }
    } else {
        $cmd = (Get-History)[-1]
        $lastduration = $cmd.EndExecutionTime - $cmd.StartExecutionTime
        $since = $cmd.EndExecutionTime - (Get-Date)
        
        if (($begin - (Get-Date)).TotalSeconds -gt -1) { # ignore quick injected commands
            '{0,-5} ' -f '0s'
        } elseif ($since.TotalMilliseconds -gt -250) {
            '{0,-5} ' -f ('{0}s' -f (SignificantDigits3 $lastduration.TotalSeconds))
        } elseif ($since.TotalSeconds -gt -120)  {
            '{0,-5} ' -f ('{0:N0}s' -f $since.TotalSeconds)
        } else  {
            '{0,-5} ' -f ('{0:N0}m' -f $since.TotalMinutes)
        }
    }
}

$GitPromptSettings.DefaultPromptPrefix.Text = '$(Prefix)'