feat: Export-4BitSvg ( Fixes #34 )

Also updating build

4bitcss.build.ps1

@@ -126,4 +126,16 @@ $4bitJS = Export-4BitJS -ColorSchemeName $allColorSchemes -DarkColorSchemeName $
 $4bitJSDocsPath = Join-Path $docsPath "js" | Join-Path -ChildPath "4bit.js"
 New-Item -ItemType File -Path $4bitJSDocsPath -Force -Value $4bitJS
 
-New-Item -ItemType File -Path ".\4bit.js" -Force -Value $4bitJS
+New-Item -ItemType File -Path ".\4bit.js" -Force -Value $4bitJS
+
+
+#region Icons
+$IncludesPath = Join-Path $docsPath "_includes"
+if (-not (Test-Path $IncludesPath)) {
+    $null = New-Item -ItemType Directory -Path $IncludesPath
+}
+
+Export-4BitSVG -SVG https://raw.githubusercontent.com/feathericons/feather/master/icons/download.svg -Stroke "ansi6" -OutputPath (Join-Path $IncludesPath "download-icon.svg")
+Export-4BitSVG -SVG https://raw.githubusercontent.com/feathericons/feather/master/icons/download-cloud.svg -Stroke "ansi6" -OutputPath (Join-Path $IncludesPath "download-cloud-icon.svg")
+Export-4BitSVG -SVG https://raw.githubusercontent.com/feathericons/feather/master/icons/shuffle.svg -Stroke "ansi6" -OutputPath (Join-Path $IncludesPath "shuffle-icon.svg")
+#endregion Icons 

Export-4BitSVG.ps1

@@ -0,0 +1,82 @@
+function Export-4BitSVG
+{
+    <#
+    .SYNOPSIS
+        Exports an SVG that uses a 4 bit palette 
+    .DESCRIPTION
+        Exports an SVG with a slight modifications that make it use a specific color palette.
+    .NOTES
+        SVGs can use CSS styles to dynamically change color.
+    #>
+    param(
+    # The SVG content, or a URL to the SVG
+    [Parameter(ValueFromPipelineByPropertyName)]
+    [string]
+    $SVG,
+
+    # The color used for strokes within the SVG.
+    [Parameter(ValueFromPipelineByPropertyName)]
+    [string]
+    $Stroke,
+
+    # The color used for fill within the SVG.
+    [Parameter(ValueFromPipelineByPropertyName)]
+    [string]
+    $Fill,
+
+    # If provided, will output the SVG to a file
+    [Parameter(ValueFromPipelineByPropertyName)]
+    [string]
+    $OutputPath
+    )
+
+    process {
+        $svgXML = $null
+        if ($svg -match "^https?://") {
+            $svgRest = Invoke-RestMethod -Uri $svg
+            if ($svgRest -isnot [xml]) {
+                Write-Error "$Svg was not XML"
+                return
+            }
+            $svgXML = $svgRest
+            $svg = $svgXML.OuterXML
+        } elseif ($svg -notmatch '[\n\r]' -and (Test-path $svg)) {
+            $svg = Get-Content -Path $svg -Raw
+        }
+
+
+        if (-not ($svg -as [xml])) {
+            try {
+                $svgXML = [xml]$svg
+            } catch {
+                $ex = $_
+                Write-Error -Exception $ex.Exception -Message "Could not convert to SVG: $($ex.Exception)" -TargetObject $svg
+            }
+        }
+
+        if (-not $svgXML) { return }
+
+        $svgClass = @(
+            if ($stroke) {
+                $stroke -replace "(?:-stroke)?$", '-stroke'
+            }
+            if ($Fill) {
+                $fill -replace "(?:-fill)?$", '-fill'
+            }
+        ) -join ' '
+
+        if ($svgClass) {
+            $svgXML.svg.SetAttribute("class", "$svgClass")
+        }
+
+        if ($OutputPath) {
+            $svgXML.svg.OuterXML | Set-Content -Path $OutputPath
+            if ($?) {
+                Get-Item -Path $OutputPath
+            }
+        } else {
+            $svgXML.svg.OuterXML
+        }
+
+    }
+}