feat: Template.HTML.Default.Layout - Aliasing -PaletteName to -Palette and allowing external palettes ( Fixes #1065 )

Author: James Brundage

Languages/HTML/Templates/Layout/HTML-Default-Layout.ps.ps1

@@ -77,9 +77,12 @@ Template function HTML.Default.Layout {
     $JavaScript,
 
     # The name of the palette to use.  If set, it will include the 4bitcss link tag.
+    # This is a CSS file that sets the foreground and background colors.
+    # If palette contains slashes, it will be presumed to be an external palette file.
+    # This palette file _should_ follow the same conventions as those found in [4bitcss](https://4bitcss.com).
     [vbn()]
-    [Alias('ColorScheme','ColorPalette')]
-    [string]
+    [Alias('Palette','ColorScheme','ColorPalette')]
+    [string[]]
     $PaletteName,
 
     # One or more google fonts to include
@@ -101,7 +104,7 @@ Template function HTML.Default.Layout {
     # The language of the page.  If set, it will include the lang attribute.
     [vbn()]
     [cultureinfo]
-    $Language,
+    $Language = [cultureinfo]::CurrentUICulture,
 
     # The date the page was published.  If set, it will include the article:published_time meta tag.
     [vbn()]
@@ -229,8 +232,13 @@ Template function HTML.Default.Layout {
             }
             if ($PaletteName) {
                 foreach ($NameOfPalette in $PaletteName) {
-                    $MachineFriendlyName = $NameOfPalette -replace '\s','-' -replace '\p{P}','-' -replace '-+','-' -replace '-$'
-                    "<link rel='stylesheet' type='text/css' href='https://cdn.jsdelivr.net/gh/2bitdesigns/4bitcss@latest/css/$MachineFriendlyName.css' id='4bitcss' />"              
+                    if ($PaletteName -match '[\\/]') {
+                        "<link rel='stylesheet' type='text/css' href='$PaletteName' id='4bitcss' />"
+                    } else {
+                        $MachineFriendlyName = $NameOfPalette -replace '\s','-' -replace '\p{P}','-' -replace '-+','-' -replace '-$'
+                        "<link rel='stylesheet' type='text/css' href='https://cdn.jsdelivr.net/gh/2bitdesigns/4bitcss@latest/css/$MachineFriendlyName.css' id='4bitcss' />"
+                    }
+                    
                 }
                 $Class += "foreground", "background"
             }