Automating SharePoint WSP files deployment with Powershell

This Powershell Script helps checking if a feature is installed (if so, retract it) and deploy all the .wsp files in the same location, save and run by using .\<scriptname>.ps1

function WaitForJobToFinish([string]$Identity)
{
$job = Get-SPTimerJob | ?{ $_.Name -like “*solution-deployment*$Identity*” }
$maxwait = 30
$currentwait = 0

if (!$job)
{
Write-Host -f Red ‘[ERROR] Timer job not found’
}
else
{
$jobName = $job.Name
Write-Host -NoNewLine “[WAIT] Waiting to finish job $jobName”
while (($currentwait -lt $maxwait))
{
Write-Host -f Green -NoNewLine .
$currentwait = $currentwait + 1
Start-Sleep -Seconds 2
if (!(Get-SPTimerJob $jobName)){
break;
}
}
Write-Host  -f Green “…Done!”
}
}

function RetractSolution([string]$Identity)
{
Write-Host “[RETRACT] Uninstalling $Identity”
Write-Host -NoNewLine “[RETRACT] Does $Identity contain any web application-specific resources to deploy?”
$solution = Get-SPSolution | where { $_.Name -match $Identity }
if($solution.ContainsWebApplicationResource)
{
Write-Host  -f Yellow “…Yes!”
Write-Host -NoNewLine “[RETRACT] Uninstalling $Identity from all web applications”
Uninstall-SPSolution -identity $Identity  -allwebapplications -Confirm:$false
Write-Host -f Green “…Done!”
}
else
{
Write-Host  -f Yellow  “…No!”
Uninstall-SPSolution -identity $Identity -Confirm:$false
Write-Host -f Green “…Done!”
}

WaitForJobToFinish

Write-Host -NoNewLine  ‘[UNINSTALL] Removing solution:’ $SolutionName
Remove-SPSolution -Identity $Identity -Confirm:$false
Write-Host -f Green “…Done!”
}

function DeploySolution([string]$Path, [string]$Identity)
{
Write-Host -NoNewLine “[DEPLOY] Adding solution:” $Identity
Add-SPSolution $Path
Write-Host -f Green “…Done!”

Write-Host -NoNewLine “[DEPLOY] Does $Identity contain any web application-specific resources to deploy?”
$solution = Get-SPSolution | where { $_.Name -match $Identity }

if($solution.ContainsWebApplicationResource)
{
Write-Host -f Yellow “…Yes!”
Write-Host -NoNewLine “[DEPLOY] Installing $Identity for all web applications”
Install-SPSolution -Identity $Identity -AllWebApplications -GACDeployment

}
else
{
Write-Host -f Yellow “…No!”
Write-Host -NoNewLine “[DEPLOY] Globally deploying $Identity”
Install-SPSolution -Identity $Identity -GACDeployment
}
Write-Host -f Green “…Done!”

WaitForJobToFinish
}

$snapin = Get-PSSnapin | Where-Object { $_.Name -eq “Microsoft.SharePoint.Powershell” }
if ($snapin -eq $null) {
Write-Host “[INIT] Loading SharePoint Powershell Snapin”
Add-PSSnapin “Microsoft.SharePoint.Powershell”
}

Write-Host “[INIT] Locating WSP files to be deployed”
$wsps = Get-ChildItem . *.wsp | where-object { !($_.psiscontainer) }

foreach ($wsp in $wsps)
{
$identity = $wsp.Name
$path = $wsp.FullName
Write-Host “[INFO] —————————————-”
Write-Host “[INFO] Installing $Identity”
Write-Host -NoNewLine “[INFO] Determining if $Identity is already installed”

$isInstalled = Get-SPSolution | where { $_.Name -eq $identity }
if ($isInstalled)
{
Write-Host -ForegroundColor Yellow “…Yes!”
//(RetractSolution $identity)
//(DeploySolution $path $identity)
}
else
{
Write-Host -ForegroundColor Yellow “…No!”
//(DeploySolution $path $identity)
}

Write-Host -NoNewline “[INFO] Installation and deployment of $Identity”
Write-Host -ForegroundColor Green “…Done!”
}

Source : https://jmkristiansen.wordpress.com/2012/02/17/automatically-retract-remove-add-and-deploy-sharepoint-2010-wsp-solution-files-with-powershell/