Install-PSModule.ps1

function Install-PSModule
{
[CmdletBinding()]
param(
    [Parameter(Mandatory)]
    [string] $ModuleName,
    [Parameter(Mandatory,ParameterSetName="Local")]
    [string] $Path,
    [ValidateSet("User","System","ProgramFiles","Local")]
    [string] $Target = "User"
)
    $ErrorActionPreference = "Stop"
    Set-StrictMode -Version Latest

    if(!(Test-Path $Path -PathType Container)){
        Write-Error ("Directory is not found! : {0}" -f $Path)
    }

    #Resolve target module base directory
    switch($Target)
    {
        "Local"{
            $moduleBasePath = Join-Path (Resolve-Path .) "Modules" #Use Current Directory
        }
        default{
            $moduleBasePath = $env:PSModulePath.Split(";") | where {$_.StartsWith([Environment]::GetFolderPath($Target),[StringComparison]::InvariantCultureIgnoreCase)} | select -First 1
        }
    }
    if([String]::IsNullOrEmpty($moduleBasePath)){
        throw ("PowerShell module path is not found for target({0})" -f $Target)
    }
   
    #Set target module directory
    $modulePath = Join-Path $moduleBasePath $ModuleName
 
    #Change current directory to get relative path
    Push-Location -Path $Path  
    try{
        $items = Get-ChildItem -File -Recurse #Get files under current directory
        Write-Verbose ("Install PowerShell module to '{0}'..." -f $modulePath)
        foreach($item in $items)
        {
            #Relative path to CopyFrom basepath
            $relativePath = Resolve-Path $item.FullName -Relative

            #Copy file operation target path 
            $destination = Join-Path $modulePath $relativePath

            #Create directory if not exist already
            (New-Object IO.FileInfo($destination)).Directory.Create()
            
            Write-Verbose ("`tCopy file '{0}'" -f $relativePath)
            Copy-Item -Path $item.FullName -Destination $destination -Force
        }
    }
    finally
    {
        Pop-Location -ErrorAction Ignore
    }
}