Use-Less.ps1
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function Use-Less { <# .Synopsis Creates a .CSS file from a .LESS file .Description Uses DotLess to create a .CSS file from a .LESS file. .Link http://lesscss.org/ .Link http://www.dotlesscss.org/ .Example Use-Less -LessCss ".example {width: 10 + 10 px}" #> [OutputType([string])] param( # The Less CSS content. To learn how to use LessCSS, visit the [LessCSS website](http://lesscss.org/) #|LinesForInput 50 [Parameter(Mandatory=$true,Position=0,ValueFromPipelineByPropertyName=$true)] [string] $LessCss, # If provided, will change variables in the LESS CSS file prior to compiling it. [Parameter(Position=1,ValueFromPipelineByPropertyName=$true)] [Hashtable] $Option ) process { if (-not ('Dotless.core.less' -as [type])) { # Find the less tool $lessTool = Get-ChildItem -Path $env:Temp\DotLess\dotless.Core.dll -ErrorAction SilentlyContinue # If it's not found, download it if (-not $lessTool) { # Get the downlaods page $dotLessLinks = Get-Web -Url "https://github.com/dotless/dotless/downloads" -UseWebRequest -Tag 'a' # Find the latest build $dotLessLink = $dotLessLinks | Where-Object { $_.Xml.Href -like "*.zip" -and $_.Xml.InnerText -like "*dotless*" }| Select-Object -First 1 # Download it $zipContent = Get-Web -Url ("https://github.com" + $dotLessLink.Xml.Href) -UseWebRequest -AsByte # Save it [IO.File]::WriteAllBytes("$env:Temp\dotless.zip", $zipContent) # Expand it Expand-Zip -ZipPath "$env:Temp\dotless.zip" -OutputPath "$env:Temp\DotLess" } } if ($Option) { $lessLines = $LessCss -split "[$([Environment]::NewLine)]" -ne '' $newLess = foreach ($line in $lessLines) { if ($line -like "@*:*" -and $line -notlike "@*:*@*") { $optionName = ($line -split ":")[0].TrimStart('@') if ($option.$optionName) { "@${optionName}:$($Option.$optionName);" } else { $line } } else { $line } } $LessCss = $newLess -join ([Environment]::NewLine) } # Get the less tool again $lessTool = Get-ChildItem -Path $env:Temp\DotLess\dotless.core.dll # Quit if we can't if (-not $lessTool) { return } $null = [Reflection.Assembly]::LoadFrom($lessTool.Fullname) # Run it $lessResult = [dotless.Core.less]::Parse($LessCss) $lessResult } } |