A PowerShell script to clean up all old merged in branches both locally and on the origin server.

Clean-GitBranches.ps1

# First run this script with the test parameter to see what it plans to delete
# .\Clean-GitBranches.ps1 -Test

param(
    [string]$TopBranch = $(git rev-parse --abbrev-ref HEAD),
    [switch]$Test
)

Write-Host "`n🔍 Scanning for branches merged into '$TopBranch'..." -ForegroundColor Cyan

# Fetch latest from remote
git fetch --prune

# Checkout the top branch to ensure we’re comparing correctly
git checkout $TopBranch

# Get merged branches (excluding current and protected ones)
$mergedBranches = git branch --merged | ForEach-Object {
    $_.Trim().TrimStart('*').Trim()
} |
    Where-Object { $_ -ne $TopBranch -and $_ -ne 'main' -and $_ -ne 'master' }

foreach ($branch in $mergedBranches) {
    $isRemote = $false
    $isLocal = $true

    # Check if the remote branch exists
    git ls-remote --exit-code --heads origin $branch 2>$null | Out-Null
    if ($LASTEXITCODE -eq 0) {
        $isRemote = $true
    }

    if ($Test) {
        $localMark = if ($isLocal) { "🟢" } else { "⚪" }
        $remoteMark = if ($isRemote) { "🌐" } else { "⚪" }

        Write-Host "$localMark$remoteMark $branch" -ForegroundColor Gray
    } else {
        Write-Host "🧹 Deleting local branch: $branch" -ForegroundColor Yellow
        git branch -d $branch

        if ($isRemote) {
            Write-Host "🌐 Deleting remote branch: origin/$branch" -ForegroundColor Magenta
            git push origin --delete $branch
        } else {
            Write-Host "⚠️ Remote branch 'origin/$branch' does not exist or already deleted." -ForegroundColor DarkGray
        }
    }
}

if ($Test) {
    Write-Host "`n✅ Test complete. No branches were deleted." -ForegroundColor Green
} else {
    Write-Host "`n✅ Local Cleanup complete." -ForegroundColor Green
}

Write-Host "`n🔍 Scanning for remote branches with no local counterpart..." -ForegroundColor Cyan

# Get all remote branches (without origin/)
$remoteBranches = git branch -r | ForEach-Object {
    $_.Trim()
} | Where-Object {
    ($_ -notmatch '->') -and ($_ -ne 'origin/HEAD')
} | ForEach-Object {
    $_ -replace '^origin/', ''
}

# Get all local branches
$localBranches = git branch | ForEach-Object {
    $_.Trim().TrimStart('*').Trim()
}

# Find remote branches that don't exist locally
$remoteOnlyBranches = $remoteBranches | Where-Object {
    $localBranches -notcontains $_
}

if ($remoteOnlyBranches.Count -eq 0) {
    Write-Host "✅ No remote-only branches found." -ForegroundColor Green
    return
}

Write-Host "`n🌐 Remote-only branches found:" -ForegroundColor Cyan
$remoteOnlyBranches | ForEach-Object { Write-Host "🗑️  $_" }

if ($Test) {
    Write-Host "`n🧪 Test mode active. No branches were deleted." -ForegroundColor Yellow
    return
}

# Confirm deletion
$confirm = Read-Host "`n❓ Delete all these remote-only branches? (y/n)"
if ($confirm -eq 'y') {
    foreach ($branch in $remoteOnlyBranches) {
        Write-Host "🔻 Deleting origin/$branch..." -ForegroundColor Magenta
        git push origin --delete $branch
    }
    Write-Host "`n✅ All remote-only branches deleted." -ForegroundColor Green
} else {
    Write-Host "`n❌ No remote branches deleted." -ForegroundColor Yellow
}