<#
.SYNOPSIS
Checks in files in a SharePoint document library.

.DESCRIPTION
The script checks in a single file or loops
through a document library and checks in all files.

.PARAMETER url
subsite url.

.PARAMETER folder
folder name

.PARAMETER file
file name

.PARAMETER comment
Checkin comment

.PARAMETER checkinType
checkin type, can be: Major,
Minor or Overwrite

.PARAMETER all
checks out all files.

.EXAMPLE
PS > .\CheckIn-SPFile.ps1 -url http://nimaintra.net -folder "Shared Documents" `
>> -comment "Checked in by Administrator" -checkinType MinorCheckIn -all

Checks in all files that are not already checked in to the "Shared Documents"
document library as minor versions and adds a checkin comment.
#>

param(
  [string]$url, 
  [string]$folder,
  [string]$file,
  [string]$comment,
  [string]$checkinType,
  [switch]$all
)

$spAssignment = Start-SPAssignment

# use a switch to get checkin type,
# defaults to minor version if value
# not within range.

switch($checkinType) {
 {$_ -match "^major" } {
  $spCheckinType = [Microsoft.SharePoint.SPCheckinType]::MajorCheckIn
 }
 {$_ -match "^minor" } {
  $spCheckinType = [Microsoft.SharePoint.SPCheckinType]::MinorCheckIn
 }
 {$_ -match "^overwrite" } {
  $spCheckinType = [Microsoft.SharePoint.SPCheckinType]::OverwriteCheckIn
 }
 Default {
  $spCheckinType = [Microsoft.SharePoint.SPCheckinType]::MinorCheckIn
 }
}

$spWeb = Get-SPWeb $url -AssignmentCollection $spAssignment

# Check if All files should be checked out
if($all) {

  # Get the folder
  $spFolder = $spWeb.GetFolder($folder)

  # Store file collection in a variable
  $spFileCollection = $spFolder.Files

  # loop through files and check out if
  # file is not already checked out

  $spFileCollection | ForEach-Object {

    # check if file is not checked in
    if($_.CheckOutType -ne "None") {

      Try {
        $_.CheckIn($comment,$spCheckinType)
      } Catch {
        "You cannot overwrite a major version file"
        $check = $true
      } Finally {
        if($check -eq $true) {
          Write-Host $_.Name Not Checked in
        } else {
          Write-Host $_.Name checked in
        }
        $check = $null
      }

    } else {
      Write-Host $_.Name already checked in
    }
  }
} else {

  # store file URL in a variable
  $fileURL = $folder + "/" + $file
  $spFile = $spWeb.GetFile($fileURL)

  # check if file is not checked in
  if($spFile.CheckOutType -ne "None") {

    Try {
      $spFile.CheckIn($comment,$spCheckinType)
    } Catch {
      "You cannot overwrite a major version file"
      $check = $true
    } Finally {
      if($check -eq $true) {
        Write-Host $spFile.Name Not Checked in
      } else {
        Write-Host $spFile.Name checked in
      }
      $check = $null
    }
  } else {
    Write-Host $spFile.Name already checked in
  }
}

Stop-SPAssignment $spAssignment