bryanoconnell.blogspot.com - Create zip files using PowerShell

ZipStuff.ps1

# |Info|
# Written by Bryan O'Connell, August 2013
# Purpose: Creates a .zip file of a file or folder.
#
# Sample: zipstuff.ps1 -target "C:\Projects\wsubi" -zip_to "C:\Users\Bryan\Desktop\wsubi" [-compression fast] [-timestamp] [-confirm]
#
# Params:
#  -target: The file or folder you would like to zip.
#
#  -zip_to: The location where the zip file will be created. If an old version 
#  exists, it will be deleted. 
#
#  -compression (optional): Sets the compression level for your zip file. Options:
#    a. fast - Higher process speed, larger file size (default option).
#    b. small - Slower process speed, smaller file size.
#    c. none - Fastest process speed, largest file size.
#
#  -add_timestamp (optional): Applies a timestamp to the .zip file name. 
#  By default, no timestamp is used.
#
#  -confirm (optional): When provided, indicates that you would like to be 
#  prompted when the zip process is finished.
#
# |Info| 

[CmdletBinding()]
Param (
    [Parameter(Mandatory=$true,Position=0)]
    [string]$target,
    
    [Parameter(Mandatory=$true,Position=1)]
    [string]$zip_to,

    [Parameter(Mandatory=$false,Position=2)] 
    [ValidateSet("fast","small","none")] 
    [string]$compression, 

    [Parameter(Mandatory=$false,Position=3)]
    [bool]$timestamp,

    [Parameter(Mandatory=$false,Position=4)]
    [bool]$confirm
)

#-----------------------------------------------------------------------------#

function DeleteFileOrFolder
{ Param([string]$PathToItem)

    if (Test-Path $PathToItem) 
    {
        Remove-Item ($PathToItem) -Force -Recurse;
    }
}

function DetermineCompressionLevel
{
    $CompressionToUse = $null;

    switch($compression) 
    { 
        "fast" {$CompressionToUse = [System.IO.Compression.CompressionLevel]::Fastest} 
        "small" {$CompressionToUse = [System.IO.Compression.CompressionLevel]::Optimal} 
        "none" {$CompressionToUse = [System.IO.Compression.CompressionLevel]::NoCompression} 
        default {$CompressionToUse = [System.IO.Compression.CompressionLevel]::Fastest}
    } 

    return $CompressionToUse;
}

#-----------------------------------------------------------------------------#

Write-Output "Starting zip process...";

if ((Get-Item $target).PSIsContainer)
{
    $zip_to = ($zip_to + "\" + (Split-Path $target -Leaf) + ".zip");
}
else
{
    #So, the CreateFromDirectory function below will only operate on a $target 
    #that's a Folder, which means some additional steps are needed to create a 
    #new folder and move the target file into it before attempting the zip process.

    $FileName = [System.IO.Path]::GetFileNameWithoutExtension($target);
    $NewFolderName = ($zip_to + "\" + $FileName)

    DeleteFileOrFolder($NewFolderName);

    md -Path $NewFolderName;
    Copy-Item ($target) $NewFolderName;

    $target = $NewFolderName;
    $zip_to = $NewFolderName + ".zip";
}

DeleteFileOrFolder($zip_to);

if ($timestamp)
{
    $TimeInfo = New-Object System.Globalization.DateTimeFormatInfo;
    $CurrentTimestamp = Get-Date -Format $TimeInfo.SortableDateTimePattern;
    $CurrentTimestamp = $CurrentTimestamp.Replace(":", "-");
    $zip_to = $zip_to.Replace(".zip", ("-" + $CurrentTimestamp + ".zip"));
}

$Compression_Level = (DetermineCompressionLevel);
$IncludeBaseFolder = $false;

[Reflection.Assembly]::LoadWithPartialName( "System.IO.Compression.FileSystem" );
[System.IO.Compression.ZipFile]::CreateFromDirectory($target, $zip_to, $Compression_Level, $IncludeBaseFolder); 

Write-Output "Zip process complete.";

if ($confirm)
{
    write-Output "Press any key to quit ...";
    $quit = $host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown");
}