PSGitRoot module

PSGit.psm1

$callStack = Get-PSCallStack
$caller = $callStack[1].ScriptName
$callerDirectory = Split-Path $caller

[string] $PSGitRoot = $null
if ((Get-Command 'git' -ErrorAction Ignore))
{
    $workTree = @(git rev-parse --git-path $callerDirectory --is-inside-work-tree)
    if (0 -lt $workTree.Count -and 'true' -eq $workTree[-1]) {
        $PSGitRoot = Resolve-Path (@(git rev-parse --git-path $callerDirectory --show-toplevel)[-1])
    }
}

Export-ModuleMember -Variable PSGitRoot

PSGitRoot.Tests.ps1

#Requires -Modules @{ ModuleName="Pester"; ModuleVersion="5.0.0" }

Describe "PSGitRoot" {
    BeforeAll {
        if (-not (Get-Command git -ErrorAction Stop)) {
            throw "git command is not available"
        }

        $currentPath = Get-Location
    }

    BeforeEach {
        Get-Module PSGitRoot | Remove-Module
    }

    It "Defines the root when imported into a git repository" {
        New-Item "TestDrive:/repo1/subfolder/subfolder" -ItemType Directory -Force
        Set-Location "TestDrive:/repo1/"

        git init

        Set-Content "TestDrive:/repo1/subfolder/subfolder/import.ps1" "Import-Module '$PSScriptRoot/PSGitRoot.psm1'"
        & "TestDrive:/repo1/subfolder/subfolder/import.ps1"


        $PSGitRoot | Should -Be (Resolve-Path "TestDrive:/repo1").ProviderPath
    }

    It "Defines the variable with `$null when imported outside of a git repository" {
        New-Item "TestDrive:/notarepo/subfolder/subfolder" -ItemType Directory -Force
        Set-Location "TestDrive:/notarepo/"

        Set-Content "TestDrive:/notarepo/subfolder/subfolder/import.ps1" "Import-Module '$PSScriptRoot/PSGitRoot.psm1'"
        & "TestDrive:/notarepo/subfolder/subfolder/import.ps1"


        $PSGitRoot | Should -BeNullOrEmpty
    }

    AfterAll {
        $currentPath | Set-Location
    }
}