Details of the functions used in the PatchAssemblyInfo PSake task

functionPatchAssemblyInfo.ps1

function GetRevisionNumber {
	$major = "1"
	$minor = "0"

	#we use the environment variable BUILD_NUMBER provided by teamcity, use -1 is not found to test locally the process
	$patch= if ([string]::IsNullOrEmpty($env:BUILD_NUMBER)) { "-1" } else { $env:BUILD_NUMBER }
	$major + "." + $minor + "." + $patch
}

function PatchFile ([string] $pattern, [string] $replaceString, [string] $fullPath){
	if(!(Test-Path $fullPath)) { #always test-path for build scripts
	    throw "cannot find the path at " + $fullPath
	}
	
	$matchCount = 0
	$regex = New-Object -TypeName "System.Text.RegularExpressions.Regex"  -ArgumentList $pattern
	(Get-Content $fullPath -Encoding UTF8) | Foreach-Object {
		if($regex.IsMatch($_)){
			$matchCount = $matchCount + 1
		}
		$regex.Replace($_,$replaceString)
	} | Set-Content $fullPath -Encoding UTF8
	
	if($matchCount -eq 0){ #check that some lines has been patched by the function
	    throw "no line found for patching " + $fullPath
	}
}