Use Json decoding instead of Yaml decoding for markdown frontmatter.

elm-package/src/Pages.elm

@@ -15,7 +15,6 @@ import Pages.Parser exposing (PageOrPost)
 import Platform.Sub exposing (Sub)
 import Result.Extra
 import Url exposing (Url)
-import Yaml.Decode
 
 
 type alias Content =
@@ -110,7 +109,7 @@ combineTupleResults input =
 
 init :
     (String -> view)
-    -> Yaml.Decode.Decoder metadata
+    -> Json.Decode.Decoder metadata
     -> (Json.Encode.Value -> Cmd (Msg userMsg))
     -> (metadata -> List Head.Tag)
     -> Parser metadata view
@@ -136,16 +135,11 @@ init markdownToHtml frontmatterParser toJsPort head parser content initUserModel
                 |> List.map
                     (Tuple.mapSecond
                         (\{ frontMatter, body } ->
-                            Yaml.Decode.fromString frontmatterParser frontMatter
+                            Json.Decode.decodeString frontmatterParser frontMatter
                                 |> Result.map (\parsedFrontmatter -> { parsedFrontmatter = parsedFrontmatter, body = body })
                                 |> Result.mapError
                                     (\error ->
-                                        case error of
-                                            Yaml.Decode.Parsing string ->
-                                                Html.text string
-
-                                            Yaml.Decode.Decoding string ->
-                                                Html.text string
+                                        Html.text (Json.Decode.errorToString error)
                                     )
                         )
                     )
@@ -268,7 +262,7 @@ application :
     , content : Content
     , toJsPort : Json.Encode.Value -> Cmd (Msg userMsg)
     , head : metadata -> List Head.Tag
-    , frontmatterParser : Yaml.Decode.Decoder metadata
+    , frontmatterParser : Json.Decode.Decoder metadata
     , markdownToHtml : String -> view
     }
     -> Program userFlags userModel userMsg metadata view

examples/docs/gen/RawContent.elm

@@ -13,7 +13,7 @@ content =
 markdown : List ( List String, { frontMatter : String, body : String } )
 markdown =
     [ ( ["markdown"]
-  , { frontMatter = """title: This is a markdown article
+  , { frontMatter = """{"title":"This is a markdown article"}
 """
     , body = """
 # Hey there 👋

examples/docs/src/Main.elm

@@ -6,6 +6,7 @@ import Element exposing (Element)
 import Element.Border
 import Element.Font as Font
 import Html exposing (Html)
+import Json.Decode
 import Json.Encode
 import List.Extra
 import Mark
@@ -21,7 +22,6 @@ import Pages.Parser exposing (PageOrPost)
 import RawContent
 import SocialMeta
 import Url exposing (Url)
-import Yaml.Decode
 
 
 port toJsPort : Json.Encode.Value -> Cmd msg
@@ -60,11 +60,11 @@ markdownToHtml body =
         |> Element.html
 
 
-frontmatterParser : Yaml.Decode.Decoder (Metadata.Metadata msg)
+frontmatterParser : Json.Decode.Decoder (Metadata.Metadata msg)
 frontmatterParser =
-    Yaml.Decode.field "title" Yaml.Decode.string
-        |> Yaml.Decode.map Metadata.PageMetadata
-        |> Yaml.Decode.map Metadata.Page
+    Json.Decode.field "title" Json.Decode.string
+        |> Json.Decode.map Metadata.PageMetadata
+        |> Json.Decode.map Metadata.Page
 
 
 type alias Model =