Get old branches

Get-StaleBranches.ps1

param (
    [Parameter(Mandatory = $true)] $RepositoryPath,
    [Parameter(Mandatory = $true)] $Days
)

function Get-BranchesInRepository([string]$path){
    Push-Location
    try {
        Set-Location $path
        $branches = git for-each-ref --sort='-committerdate:iso8601' --format='%(committerdate:iso8601)|%(refname:short)|%(committeremail)|%(committername)' refs/remotes/
    }
    finally {
        Pop-Location
    }
    return $branches
}

function Get-MergedBranchesInRepository([string]$path) {
    Push-Location
    try {
        Set-Location $path
        $branches = git branch --remote --merged
    }
    finally {
        Pop-Location
    }
    return $branches
}

function Parse-BranchRow([string]$row) {
    $segments = $row.Split('|')
    [pscustomobject]@{
        Branch = $segments[1]
        LastCommitDate = $segments[0]
        AuthorEmail = $segments[2]
        AuthorName = $segments[3]
    }
}

function Was-NotUpdateFor($branch, [TimeSpan] $time){
    [DateTime] $lastUpdate = [DateTime]::Parse($branch.LastCommitDate)    
    return $lastUpdate.Add($time).Ticks -lt [DateTime]::Now.Date.Ticks
}

function Is-NameRestricted($branch, [string[]]$restrictedNames) {
    [string[]] $segments = $branch.Branch.Split("/")
    foreach($seg in $segments){
        foreach($rn in $restrictedNames){
            if($seg -eq $rn){
                return $true
            }
        }
    }
}

### Main ###
$restricted = @("master", "develop", "release", "HEAD")
$time = [TimeSpan]::FromDays($Days)
$mergedBranches = Get-MergedBranchesInRepository $RepositoryPath

$staleBranches = `
Get-BranchesInRepository $RepositoryPath `
| %{ Parse-BranchRow $_ } `
| ?{ Was-NotUpdateFor $_ $time } `
| ?{ !(Is-NameRestricted $_ $restricted) }

Write-Host $staleBranches.Length
$staleBranches