Update-Path.ps1

# Append or remove a path entry to default powershell profile
# Update-Path -TargetFolder "C:\Program Files\Git\usr\bin" -Action Add
# Update-Path -TargetFolder "C:\Program Files\Git\usr\bin" -Action Remove
function Update-Path {
    param (
        [Parameter(Mandatory=$true)]
        [string]$TargetFolder,

        [ValidateSet("Add", "Remove")]
        [string]$Action = "Add"
    )

    # 1. Ensure the Profile exists
    if (!(Test-Path $PROFILE)) {
        Write-Host "Creating new PowerShell profile at $PROFILE..." -ForegroundColor Cyan
        $null = New-Item -Path $PROFILE -ItemType File -Force
    }

    # The exact string we'll look for/add in the profile
    $profileLine = "`$env:Path += ';$TargetFolder'"

    # 2. Handle the persistent profile update
    $profileContent = Get-Content $PROFILE
    
    if ($Action -eq "Add") {
        if ($profileContent -contains $profileLine) {
            Write-Host "Path already exists in profile." -ForegroundColor Yellow
        } else {
            Add-Content -Path $PROFILE -Value "`n$profileLine"
            Write-Host "Added to profile." -ForegroundColor Green
        }
        # Update current session immediately
        if ($env:Path -notlike "*$TargetFolder*") {
            $env:Path += ";$TargetFolder"
        }
    } 
    else { # Action is Remove
        $newContent = $profileContent | Where-Object { $_ -ne $profileLine }
        $newContent | Set-Content $PROFILE
        
        # Note: Removing from the *current* session's $env:Path is messy 
        # because of semicolons, so it's best to just restart the shell.
        Write-Host "Removed from profile. Restart PowerShell for full effect." -ForegroundColor Yellow
    }
}