Add markdown helper function.

examples/docs/src/MarkdownCodec.elm

@@ -42,6 +42,39 @@ withFrontmatter constructor frontmatterDecoder renderer filePath =
         )
 
 
+withoutFrontmatter :
+    (frontmatter -> List view -> value)
+    -> Decoder frontmatter
+    -> Markdown.Renderer.Renderer view
+    -> String
+    -> DataSource.DataSource value
+withoutFrontmatter constructor frontmatterDecoder renderer filePath =
+    DataSource.map2 constructor
+        (StaticFile.onlyFrontmatter
+            frontmatterDecoder
+            filePath
+        )
+        ((StaticFile.bodyWithoutFrontmatter
+            filePath
+            |> DataSource.andThen
+                (\rawBody ->
+                    rawBody
+                        |> Markdown.Parser.parse
+                        |> Result.mapError (\_ -> "Couldn't parse markdown.")
+                        |> DataSource.fromResult
+                )
+         )
+            |> DataSource.distillSerializeCodec ("markdown-blocks-" ++ filePath)
+                (S.list codec)
+            |> DataSource.andThen
+                (\blocks ->
+                    blocks
+                        |> Markdown.Renderer.render renderer
+                        |> DataSource.fromResult
+                )
+        )
+
+
 codec : S.Codec Never Block
 codec =
     S.customType