A PowerShell function to get the size and number of files in the hidden .git directory.

Get-GitSize.ps1

Function Get-GitSize {
<#
.SYNOPSIS
Get the size of .git folder
.DESCRIPTION
When using git, it creates a hidden folder for change tracking. Because the file is hidden it is easy to overlook how large it might become. This command provides a simple mechanism for calculating the size of the .git folder. Specify the parent folder path.
.PARAMETER Path
The path to the parent folder, not the .git folder.
.EXAMPLE
PS C:\scripts\PiedPiperBox> Get-GitSize

Path                     Files  Size
----                     -----  ----
C:\scripts\PiedPiperBox\    30 18456

Get the size of the .git folder from the current path The size is in bytes.

.EXAMPLE
PS C:\> Get-GitSize C:\scripts\DevOps-Courses\ -as mb

Path                       Files             Size
----                       -----             ----
C:\scripts\DevOps-Courses\  1084 163.680551528931

Get the size of .git under the DevOp-Courses folder formatted as MB.
.EXAMPLE
PS C:\scripts> dir -Directory | Get-GitSize

Path                              Files   Size
----                              -----   ----
C:\scripts\ADMXTests                 57  33192
C:\scripts\AutoLab2                  46  74980
C:\scripts\ComputerCertificates      37  23635
C:\scripts\Copy-Command              83  57112
C:\scripts\Demo Class-Based Tools   175 643881
...

Find all folders in C:\Scripts with a .git directory and calculate the space for each.
.INPUTS
[System.String]
[PSCustomObject]
.NOTES
Learn more about PowerShell: http://jdhitsolutions.com/blog/essential-powershell-resources/
.LINK
Get-ChildItem
.LINK
Measure-Object
#>

    [cmdletbinding()]
    Param (
        [Parameter(Position = 0, ValueFromPipeline, ValueFromPipelinebyPropertyName)]
        [alias("pspath")]
        [ValidateScript( {Test-Path $_})]
        [string]$Path = ".",
        [ValidateSet("kb", "mb", "gb")]
        [string]$As
    )

    Begin {
        Write-Verbose "[$((Get-Date).TimeofDay) BEGIN] Starting $($myinvocation.mycommand)"

    } #begin
    Process {
        $full = Convert-Path -Path $Path
        Write-Verbose "[$((Get-Date).TimeofDay) PROCESS] Processing path $full"
        $git = Join-Path -Path $full -childpath ".git"
        Write-Verbose "[$((Get-Date).TimeofDay) PROCESS] Testing $git"
        if (Test-Path -path $git) {

            Write-Verbose "[$((Get-Date).TimeofDay) PROCESS] Measuring $git"
            #get the total size of all files in the .git folder
            $stat = Get-Childitem -path $git -Recurse -File | Measure-Object -Property length -sum

            if ($As) {
                Write-Verbose "[$((Get-Date).TimeofDay) PROCESS] Calculating size as $($As.toUpper())"
                $size = $stat.sum / "1$as"
            }
            else {
                $size = $stat.sum
            }
            #create the output
            [PSCustomObject]@{
                Path  = $full
                Files = $stat.count
                Size  = $Size
            } #customobject
        } #if test-path
        else {
            Write-Verbose "[$((Get-Date).TimeofDay) PROCESS] Did not find $git"
        }
        } #process
    End {
        Write-Verbose "[$((Get-Date).TimeofDay) END    ] Ending $($myinvocation.mycommand)"
    } #end
}

This function is described at https://jdhitsolutions.com/blog/powershell/6465/keeping-git-in-check-with-powershell/

Would it make sense to limit the number of digits to something like 2 decimal places when using -As?

Would it make sense to limit the number of digits to something like 2 decimal places when using -As?

That is up to you. I'm reluctant to hardcode that as the value because what if someone else wants 4 decimal places? If you need it to be 2 decimal places then process the function output with Select-Object and do it there.

I have a revised version of this function at https://gist.github.com/jdhitsolutions/4b2f0acabf7bd69ac7e9c590273f36b2

I have a retooled version of this function at https://gist.github.com/jdhitsolutions/4b2f0acabf7bd69ac7e9c590273f36b2