Add theme option

src/routes/preferences.nim

@@ -1,4 +1,4 @@
-import strutils, uri
+import strutils, uri, os
 
 import jester
 
@@ -8,13 +8,17 @@ import ../views/[general, preferences]
 
 export preferences
 
+proc findThemes*(dir: string): seq[string] =
+  for kind, path in walkDir(dir / "css" / "themes"):
+    result.add path.splitFile.name.capitalizeAscii
+
 proc createPrefRouter*(cfg: Config) =
   router preferences:
     template savePrefs(): untyped =
       setCookie("preferences", $prefs.id, daysForward(360), httpOnly=true, secure=cfg.useHttps)
 
     get "/settings":
-      let html = renderPreferences(cookiePrefs(), refPath())
+      let html = renderPreferences(cookiePrefs(), refPath(), findThemes(cfg.staticDir))
       resp renderMain(html, request, cfg, "Preferences")
 
     get "/settings/@i?":