Prevent long file paths in git

GetPrDiffsAndCheckForExceedinglyLongFilePaths.ps1

param([String] $projectId,
       [String] $repositoryId,
       [String] $prTargetBranch,
       [String] $prSourceBranch,
       [String] $BUILD_SOURCEVERSIONMESSAGE,
       [decimal] $acceptedPathLength)

#Example usage: .\GetPrDiffsAndCheckForExceedinglyLongFilePaths.ps1 -projectId "daad9574-2d95-4363-a5e1-886ae9549690" -repositoryId "060b25a7-9d74-4897-9fdc-ac29ba8f3b8b" -prSourceBranch "myBranch/mpi_installation_guide_jobs" -prTargetBranch "dev_myBranch" -acceptedPathLength 1
#To Get the projectid and repositoryId, open the devtools from the browser in one of the PR in the repo and search for "workitems". The request will use the params you need
#Example url for a manual execution to my_change_branch to dev
#https://mtTfsUrl/tfs/myCollection/daad9574-2d95-4363-a5e1-886ae9549690/_apis/git/repositories/060b25a7-9d74-4897-9fdc-ac29ba8f3b8b/diffs/commits?baseVersion=dev&targetVersion=my_change_branch&$top=1000&api-version=3.0-preview
#Example for a PR
#.\GetPrDiffsAndCheckForExceedinglyLongFilePaths.ps1 -projectId "daad9574-2d95-4363-a5e1-886ae9549690" -repositoryId "060b25a7-9d74-4897-9fdc-ac29ba8f3b8b" -BUILD_SOURCEVERSIONMESSAGE  "Merge pull request 909 from myBranch_pod2/mpi_installation_guide_jobs into dev_myBranch" -acceptedPathLength 40

if([string]::IsNullOrEmpty($projectId)){
    throw "The parameter $projectId is required";
}

if([string]::IsNullOrEmpty($repositoryId)){
    throw "The parameter $repositoryId is required";
}

if(([string]::IsNullOrEmpty($prSourceBranch)) -and ([string]::IsNullOrEmpty($BUILD_SOURCEVERSIONMESSAGE))){
    throw "You either have to pass prSourceBranch or $BUILD_SOURCEVERSIONMESSAGE which will be used to determine the branches.";
}

if([string]::IsNullOrEmpty($acceptedPathLength)){
    throw "The parameter $acceptedPathLength is required";
}


$tfsUrlBit="https://mtTfsUrl/tfs/myCollection/"
##E.g. projectId
#daad9574-2d95-4363-a5e1-886ae9549690

$apiUrlBit= "/_apis/git/repositories/"

##E.g. repositoryId
#060b25a7-9d74-4897-9fdc-ac29ba8f3b8b

$diffUrlBit = "/diffs/commits?baseVersion="
##E.g. prTargetBranch
#dev_myBranch

$targetBranchBit = "&targetVersion="
##E.g. prSourceBranch
#myBranch_pod2/mpi_installation_guide_jobs


$finalUrlBit = '&$top=1000&api-version=3.0-preview'

    if([string]::IsNullOrEmpty($prSourceBranch)){
    #e.g. BUILD_SOURCEVERSIONMESSAGE= Merge pull request 909 from dev/myDevBranch into master


    if($BUILD_SOURCEVERSIONMESSAGE.IndexOf("from") -gt -1 -and $BUILD_SOURCEVERSIONMESSAGE.IndexOf("into") -gt -1){
   # https://mtTfsUrl/tfs/myCollection/daad9574-2d95-4363-a5e1-886ae9549690/_apis/git/repositories/060b25a7-9d74-4897-9fdc-ac29ba8f3b8b/pullrequests/25702
    $fromOrIntoStringLengthPlusWhiteSpace =5;
    $positionAfterFrom = $BUILD_SOURCEVERSIONMESSAGE.IndexOf("from") + $fromOrIntoStringLengthPlusWhiteSpace;
    $positionBeforeInto = $BUILD_SOURCEVERSIONMESSAGE.IndexOf("into") -1;
    $positionAfterInto = $BUILD_SOURCEVERSIONMESSAGE.IndexOf("into") + $fromOrIntoStringLengthPlusWhiteSpace;

    $prTargetBranch = $BUILD_SOURCEVERSIONMESSAGE.Substring($positionAfterInto, $BUILD_SOURCEVERSIONMESSAGE.Length  - $positionAfterInto);
    $prSourceBranch = $BUILD_SOURCEVERSIONMESSAGE.Substring($positionAfterFrom, $positionBeforeInto - $positionAfterFrom);
    }
    }

    elseif($prSourceBranch.IndexOf("refs/pull") -gt -1){
        $pullRequestId= $prSourceBranch.Replace("refs/pull/","").Replace("/merge","");
        $tfsPullRequestUrl = "$($tfsUrlBit)$($projectId)$($apiUrlBit)$($repositoryId)/pullrequests/$($pullRequestId)"


    Write-Host $"Invoking the url ($tfsPullRequestUrl) to get the branches associated with the PR with id $($pullRequestId)"
    
    $jsonPrResult = Invoke-RestMethod -UseDefaultCredentials -uri $tfsPullRequestUrl

    $prSourceBranch = $jsonPrResult.sourceRefName.replace("refs/heads/", "");
    $prTargetBranch = $jsonPrResult.targetRefName.replace("refs/heads/", "");
    }
    elseif($prSourceBranch.IndexOf("refs/heads/") -gt -1){
        
        $prSourceBranch = $prSourceBranch.replace("refs/heads/", "");
        $prTargetBranch = $prTargetBranch.replace("refs/heads/", "");
    }
    if([string]::IsNullOrEmpty($prSourceBranch) -or ([string]::IsNullOrEmpty($prTargetBranch))){

        throw "Could not reliabily determine the source and target branch"
    }




Write-Host "Using $($prTargetBranch) as the target branch and $($prSourceBranch) as the source branch"



$tfsRequestUrl = "$($tfsUrlBit)$($projectId)$($apiUrlBit)$($repositoryId)$($diffUrlBit)$($prTargetBranch)$($targetBranchBit)$($prSourceBranch)$($finalUrlBit)"


Write-Host $"Invoking the url ($tfsRequestUrl) to get all the changed files in this PR"
 
$jsonResult = Invoke-RestMethod -UseDefaultCredentials -uri $tfsRequestUrl

$fileChanges = $jsonResult.changes;

$filesWithFilePathTooLong = @();

$fileChanges | ForEach-Object {
    $currentItem = $_.item;
    $currentItemPath = $currentItem.path;
    if(($currentItemPath.Length -gt $acceptedPathLength) -and (-not ($_.changeType.Contains("delete")))){
            $filesWithFilePathTooLong += , "$($currentItemPath) with length $($currentItemPath.Length)`n"
        
    }
}

if($filesWithFilePathTooLong.Length -gt 0){
    throw "The following $($filesWithFilePathTooLong.Length) files were found to have a path longer than the accepted value of $($acceptedPathLength): `n $($filesWithFilePathTooLong)"
}
else{
    Write-Host "No files were found to have a pathlonger than the accepted value of ($acceptedPathLength). Happy days."
}