Clean up old local Git branches with smart archiving - renames old/merged branches with "old/" prefix instead of deleting them.

rename-old-local-git-branches.ps1

# Rename old local git branches script
#
# This script renames local git branches as follows:
#   - Branches not 'main', 'master', or the current branch
#   - Branches not already starting with 'old/' and not ending with 'release'
#   - If the branch has not had a commit in over the specified days, it is renamed to 'old/{branch}'
#   - If the branch has been merged into 'eagleeye-prod-release' or 'eagleeye-stage-release', it is renamed to 'old/merged/{branch}'
#
# Usage:
#   .\rename-old-local-git-branches.ps1 -FolderPath <path-to-git-repo> -DaysOld <days> [-DryRun]
#   -FolderPath: Path to the git repository (optional, defaults to current directory)
#   -DaysOld: Number of days since last commit to consider a branch old (optional, defaults to 30)
#   -DryRun: If specified, only print what would be renamed, do not actually rename branches

param(
    [string]$FolderPath = (Get-Location),
    [int]$DaysOld = 30,
    [switch]$DryRun
)

Set-Location -Path $FolderPath

Write-Host "🔄 Fetching latest branch info..." -ForegroundColor Cyan
git fetch --prune 2>$null | Out-Null
Write-Host "✅ Fetch complete!" -ForegroundColor Green

$now = Get-Date
$thresholdDate = $now.AddDays(-$DaysOld)
$thresholdUnix = [int][double]::Parse($thresholdDate.ToUniversalTime().Subtract([datetime]'1970-01-01').TotalSeconds)

if ($DryRun) 
{
    Write-Host "🧪 DRY RUN: No branches will be renamed." -ForegroundColor Magenta
}

$currentBranch = git branch --show-current
$branches = git branch --format="%(refname:short)" | Where-Object {
    $_ -notin @("main", "master") `
    -and $_ -ne $currentBranch `
    -and -not $_.StartsWith("old/") `
    -and -not $_.ToLower().EndsWith("release")
}

$mergedIntoProd = git branch --merged eagleeye-prod-release | ForEach-Object { $_.Trim() }
$mergedIntoStage = git branch --merged eagleeye-stage-release | ForEach-Object { $_.Trim() }
$mergedBranches = ($mergedIntoProd + $mergedIntoStage) | Select-Object -Unique

Write-Host ("🌿 Current branch: {0}`n⏰ Using threshold of {1} days ({2})" -f $currentBranch, $DaysOld, $thresholdDate) -ForegroundColor Magenta  

foreach ($branch in $branches) {
    $lastCommitUnix = git log -1 --format="%ct" $branch 2>$null
    $isMerged = $mergedBranches -contains $branch

    $isOld = $false
    $lastCommitDate = "N/A"
    
    # Parse commit timestamp safely
    if (![string]::IsNullOrWhiteSpace($lastCommitUnix) -and $lastCommitUnix.Trim() -ne "") {
        try {
            $commitUnixNum = [long]$lastCommitUnix.Trim()
            if ($commitUnixNum -gt 0) {
                # Convert Unix timestamp to DateTime using .NET method
                $epoch = [datetime]::new(1970, 1, 1, 0, 0, 0, [DateTimeKind]::Utc)
                $lastCommitDate = $epoch.AddSeconds($commitUnixNum).ToLocalTime()
                $isOld = $commitUnixNum -lt $thresholdUnix
                # Write-Host "DEBUG: Branch '$branch' - Unix: $commitUnixNum, Date: $lastCommitDate, IsOld: $isOld, Threshold: $thresholdUnix" -ForegroundColor Cyan
            }
        }
        catch [System.Exception] {
            # If parsing fails, keep defaults (N/A date, not old)
            Write-Host "❌ ERROR parsing timestamp '$lastCommitUnix' for branch '$branch': $($_.Exception.Message)" -ForegroundColor Red
            $lastCommitDate = "N/A"
            $isOld = $false
        }
    } else {
        Write-Host "🔍 DEBUG: No commit timestamp found for branch '$branch'" -ForegroundColor Red
    }

    if ($isMerged) {
        $newBranch = "old/merged/$branch"
        Write-Host "📦 [ARCHIVE MERGED] $branch  ->  $newBranch (last commit: $lastCommitDate, merged: $isMerged)" -ForegroundColor Yellow
        if (-not $DryRun) {
            git branch -m $branch $newBranch
        }
    } elseif ($isOld) {
        $newBranch = "old/$branch"
        Write-Host "🗄️ [ARCHIVE OLD] $branch  ->  $newBranch (last commit: $lastCommitDate, merged: $isMerged)" -ForegroundColor Yellow
        if (-not $DryRun) {
            git branch -m $branch $newBranch
        }
    } else {
        Write-Host "⏭️ [skip] $branch (last commit: $lastCommitDate, merged: $isMerged)" -ForegroundColor DarkGray
    }
}