feat: Liquid Language Support ( Fixes #863 )

Author: James Brundage

Languages/Liquid/Liquid-Language.ps.ps1

@@ -0,0 +1,24 @@
+Language function Liquid {
+    <#
+    .SYNOPSIS
+        Liquid PipeScript Language Definition
+    .DESCRIPTION
+        Allows PipeScript to generate [Liquid](https://shopify.github.io/liquid/)
+    #>
+    [ValidatePattern("\.liquid$")]
+    param()
+
+    # Liquid files have a `.liquid` extension.    
+    $FilePattern = '\.liquid$'
+    
+    # Liquid Comments are `{% comment %}` and `{% endcomment %}`, respectively.
+    $StartComment = "\{\%\s{1,}comment\s{1,}\%\}"    
+    $EndComment   = "\{\%\s{1,}endcomment\s{1,}\%\}"
+
+    # PipeScript exists within liquid as block encased in a pseudocomment.
+    $StartPattern = "\{\%\s{1,}(?>pipescript|\{)"    
+    $EndPattern   = "(?>pipescript|\})\s{1,}\%\}"
+    
+    $Website      = 'https://shopify.github.io/liquid/'
+    $ProjectURI   = 'https://github.com/Shopify/liquid'
+}