diff --git a/app/IR.hs b/app/IR.hs
index 1348db8..0e41902 100644
--- a/app/IR.hs
+++ b/app/IR.hs
@@ -3,6 +3,7 @@ module IR where
 import Data.Text
 
 newtype Document = Doc [Element]
+  deriving (Show)
 
 data Element
   = Heading Heading
@@ -12,6 +13,7 @@ data Element
   | HTML HTML
   | Paragraph Paragraph
   | HorizontalRule
+  deriving (Show)
 
 -- Removed: BlankLine
 
@@ -19,32 +21,37 @@ data Heading = H
   { level :: Int,
     text :: [InlineText]
   }
+  deriving (Show)
 
 data Code = C
   { language :: Maybe Text,
     code :: Text
   }
+  deriving (Show)
 
-data BlockQuote = Q [InlineText]
+data BlockQuote = Q [InlineText] deriving (Show)
 
 data ListItem = LI
   { content :: [InlineText], -- Flatten continuations into here
     children :: [List]
   }
+  deriving (Show)
 
-data ListType = Ordered | Unordered
+data ListType = Ordered | Unordered deriving (Show)
 
 data List = L
   { list_type :: ListType,
     items :: [ListItem]
   }
+  deriving (Show)
 
 data HTML
   = HTMLTag
   { html_content :: Text
   }
+  deriving (Show)
 
-newtype Paragraph = P [InlineText]
+newtype Paragraph = P [InlineText] deriving (Show)
 
 data InlineText
   = Text Text -- Combined Normal and Escaped
@@ -62,6 +69,7 @@ data InlineText
         title :: Maybe Text
       }
   | HTMLInline {inline_html_content :: Text}
+  deriving (Show)
 
 -- for processing math
 -- https://hackage.haskell.org/package/typst-0.6.1/docs/Typst-Parse.html#v:parseTypst
diff --git a/app/Markdown.hs b/app/Markdown.hs
index 392bd1a..5ffcf7c 100644
--- a/app/Markdown.hs
+++ b/app/Markdown.hs
@@ -2,10 +2,11 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 
-module Markdown (document, metadata) where
+-- (document, metadata)
+module Markdown where
 
 import Control.Applicative (many, optional, some, (<|>))
-import Control.Monad (guard, void, when)
+import Control.Monad (guard, void)
 import Data.Char (isAlpha)
 import Data.Text (Text)
 import qualified Data.Text as T
@@ -175,7 +176,6 @@ orderedListItem = do
 -- HTML Block
 htmlBlock :: Parser Element
 htmlBlock = do
-  start <- getPosition
   char '<'
   -- Capture the entire HTML block as raw text
   rest <- manyTill anyChar (try $ char '>' >> lineEnding)
@@ -219,10 +219,10 @@ paragraphBlock = do
   notFollowedBy (string "```" <|> string "~~~")
   notFollowedBy (count 4 (char ' ' <|> char '\t'))
   notFollowedBy (count 3 (char '*') <|> count 3 (char '-') <|> count 3 (char '_'))
-  notFollowedBy (char '<')
+  -- notFollowedBy (char '<')
 
   content <- some inlineElement
-  lineEnding
+  lineEnding <|> eof
   pure $ Paragraph $ P content
 
 -- Inline Elements
@@ -400,14 +400,14 @@ plainText = Text . T.pack <$> some plainTextChar
 
 plainTextChar :: Parser Char
 plainTextChar = satisfy $ \c ->
-  (c `notElem` ("*_`[!<\\\n\r" :: String)) && c >= ' '
+  (c `notElem` ("*_`[<\\\n\r" :: String)) && c >= ' '
 
 plainTextNoAsterisk :: Parser InlineText
 plainTextNoAsterisk =
   Text . T.pack
     <$> some
       ( satisfy $ \c ->
-          (c `notElem` ("*_`[!<\\\n\r" :: String)) && c >= ' '
+          (c `notElem` ("*_`[<\\\n\r" :: String)) && c >= ' '
       )
 
 plainTextNoUnderscore :: Parser InlineText
@@ -415,7 +415,7 @@ plainTextNoUnderscore =
   Text . T.pack
     <$> some
       ( satisfy $ \c ->
-          not (c `elem` ("_*`[!<\\\n\r" :: String)) && c >= ' '
+          not (c `elem` ("_*`[<\\\n\r" :: String)) && c >= ' '
       )
 
 plainTextNoBracket :: Parser InlineText
@@ -423,7 +423,7 @@ plainTextNoBracket =
   Text . T.pack
     <$> some
       ( satisfy $ \c ->
-          not (c `elem` ("]_*`[!<\\\n\r" :: String)) && c >= ' '
+          not (c `elem` ("]_*`[<\\\n\r" :: String)) && c >= ' '
       )
 
 -- Helper Parsers
diff --git a/app/Utilities.hs b/app/Utilities.hs
index b084ae7..c071f6e 100644
--- a/app/Utilities.hs
+++ b/app/Utilities.hs
@@ -2,8 +2,6 @@ module Utilities where
 
 import Config
 import Control.Monad (filterM)
-import Data.Aeson (Result (Error, Success))
-import qualified Data.Aeson as A
 import Data.List (find)
 import Data.Text (Text)
 import qualified Data.Text as T
@@ -39,9 +37,13 @@ indexHtmlMarkdownSourcePath =
 markdownToHtml :: (FromJSON a) => FilePath -> Action (a, Text)
 markdownToHtml filePath = do
   content <- Shake.readFile' filePath
-  -- TODO: error handling
-  let Right (metadataText, document) = parse (liftA2 (,) Markdown.metadata Markdown.document) filePath content
-  let Right metadata = decodeEither' $ encodeUtf8 metadataText
+  let (metadataText, document) = case parse (liftA2 (,) Markdown.metadata Markdown.document) filePath content of
+        Right (a, b) -> (a, b)
+        Left e -> error $ show e
+
+  let metadata = case decodeEither' $ encodeUtf8 metadataText of
+        Right m -> m
+        Left e -> error $ show e
   pure (metadata, compileToHTML document)
 
 now :: Action T.Text
@@ -51,8 +53,12 @@ markdownToPost :: FilePath -> Action Post
 markdownToPost path = do
   content <- Shake.readFile' path
   -- TODO: error handling
-  let Right postData = parse Markdown.metadata path content
-  let Right post = decodeEither' $ encodeUtf8 postData
+  let postData = case parse Markdown.metadata path content of
+        Right p -> p
+        Left e -> error $ show e
+  let post = case decodeEither' $ encodeUtf8 postData of
+        Right p -> p
+        Left e -> error $ show e
   pure post
 
 yamlToPost :: FilePath -> Action Post