Fix page/post template lists

- WIP on loading themes from different directory

src/MyWebLog.Data/Data.fs

@@ -724,6 +724,15 @@ module Theme =
             resultOption; withRetryOptionDefault
         }
     
+    /// Retrieve a theme by its ID, excluding the text of templates
+    let findByIdWithoutText (themeId : ThemeId) =
+        rethink<Theme> {
+            withTable Table.Theme
+            get themeId
+            merge (fun row -> r.HashMap ("templates", row["templates"].Without [| "text" |]))
+            resultOption; withRetryOptionDefault
+        }
+    
     /// Save a theme
     let save (theme : Theme) =
         rethink {

src/MyWebLog/Handlers/Admin.fs

@@ -164,6 +164,7 @@ let editPage pgId : HttpHandler = fun next ctx -> task {
     match result with
     | Some (title, page) ->
         let  model     = EditPageModel.fromPage page
+        let! templates = templatesForTheme ctx "page"
         return!
             Hash.FromAnonymousObject {|
                 csrf       = csrfToken ctx
@@ -171,7 +172,7 @@ let editPage pgId : HttpHandler = fun next ctx -> task {
                 metadata   = Array.zip model.metaNames model.metaValues
                              |> Array.mapi (fun idx (name, value) -> [| string idx; name; value |])
                 page_title = title
-                templates  = templatesForTheme ctx "page"
+                templates  = templates
             |}
             |> viewForTheme "admin" "page-edit" next ctx
     | None -> return! Error.notFound next ctx

src/MyWebLog/Handlers/Helpers.fs

@@ -185,19 +185,20 @@ open System.Collections.Generic
 open System.IO
 
 /// Get the templates available for the current web log's theme (in a key/value pair list)
-let templatesForTheme (ctx : HttpContext) (typ : string) =
-    seq {
+let templatesForTheme (ctx : HttpContext) (typ : string) = backgroundTask {
+    match! Data.Theme.findByIdWithoutText (ThemeId ctx.WebLog.themePath) ctx.Conn with
+    | Some theme ->
+        return seq {
             KeyValuePair.Create ("", $"- Default (single-{typ}) -")
             yield!
-            Path.Combine ("themes", ctx.WebLog.themePath)
-            |> Directory.EnumerateFiles
-            |> Seq.filter (fun it -> it.EndsWith $"{typ}.liquid")
-            |> Seq.map (fun it ->
-                let parts    = it.Split Path.DirectorySeparatorChar
-                let template = parts[parts.Length - 1].Replace (".liquid", "")
-                KeyValuePair.Create (template, template))
+                theme.templates
+                |> Seq.ofList
+                |> Seq.filter (fun it -> it.name.EndsWith $"-{typ}" && it.name <> $"single-{typ}")
+                |> Seq.map (fun it -> KeyValuePair.Create (it.name, it.name))
         }
         |> Array.ofSeq
+    | None -> return [| KeyValuePair.Create ("", $"- Default (single-{typ}) -") |]
+}
 
 /// Get all authors for a list of posts as metadata items
 let getAuthors (webLog : WebLog) (posts : Post list) conn =

src/MyWebLog/Maintenance.fs

@@ -122,7 +122,11 @@ let importLinks args sp = task {
 /// Load a theme from the given ZIP file
 let loadTheme (args : string[]) (sp : IServiceProvider) = task {
     if args.Length > 1 then
-        match Handlers.Admin.getThemeName args[1] with
+        let fileName =
+            match args[1].LastIndexOf Path.DirectorySeparatorChar with
+            | -1 -> args[1]
+            | it -> args[1][(it + 1)..]
+        match Handlers.Admin.getThemeName fileName with
         | Some themeName ->
             let conn   = sp.GetRequiredService<IConnection> ()
             let clean  = if args.Length > 2 then bool.Parse args[2] else true