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Set-ExecutionPolicy RemoteSigned
# Edit HOSTS file Script
# Brian Gallagher (http://briangallagher.me)
#

# If you use Sublime text, and don't have an alias for it yet, uncomment the line below and change the path to ST
#Set-Alias st 'C:\Program Files\Sublime Text 3\sublime_text.exe'

$file = join-path -path $env:SystemRoot -childpath "System32\drivers\etc\hosts"

function add-host([string]$filename, [string]$ip, [string]$hostname) {
    remove-host $filename $hostname
    $ip + "`t`t" + $hostname | Out-File -encoding ASCII -append $filename
}

function remove-host([string]$filename, [string]$hostname) {
    $c = Get-Content $filename
    $newLines = @()

    foreach ($line in $c) {

        $bits = [regex]::Split($line, "\t+")
        if ($bits.count -eq 2) {
            if ($bits[1] -ne $hostname) {
                $newLines += $line
            }
        } else {
            $newLines += $line
        }
    }

    # Write file
    Clear-Content $filename
    foreach ($line in $newLines) {
        $line | Out-File -encoding ASCII -append $filename
    }
}

function edit-hosts([string]$filename) {
    #using an editor like sublime text
    st $filename

    #use the command below if you want to use another editor
    #start $filename
}

function print-hosts([string]$filename) {
    $c = Get-Content $filename

    foreach ($line in $c) {
        $bits = [regex]::Split($line, "\t+")
        if ($bits.count -eq 2) {
            Write-Host $bits[0] `t`t $bits[1]
        }
    }
}


function hosts {

    try {
        if ($args[0] -eq "add") {

            if ($args.count -lt 3) {
                throw "Not enough arguments for add."
            } else {
                add-host $file $args[1] $args[2]
            }

        } elseif ($args[0] -eq "remove") {

            if ($args.count -lt 2) {
                throw "Not enough arguments for remove."
            } else {
                remove-host $file $args[1]
            }

        } elseif ($args[0] -eq "show") {
            print-hosts $file
        } elseif ($args[0] -eq "edit") {
            edit-hosts $file
        } else {
            throw "Invalid operation '" + $args[0] + "' - must be one of 'add', 'remove', 'show'."
        }
    } catch  {
        Write-Host $error[0]
        Write-Host "`nUsage: hosts add <ip> <hostname>`n       hosts remove <hostname>`n       hosts show"
    }
}