From 722e30758b7a222a0e074bd17d8116001560c156 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sat, 7 Feb 2026 17:10:21 +0100
Subject: Terminal: use FormattedText in printLine

---
 src/Erebos/TextFormat/Ansi.hs  | 37 +++++++++++++++++++++++++++++--------
 src/Erebos/TextFormat/Types.hs |  1 +
 2 files changed, 30 insertions(+), 8 deletions(-)

(limited to 'src/Erebos/TextFormat')

diff --git a/src/Erebos/TextFormat/Ansi.hs b/src/Erebos/TextFormat/Ansi.hs
index c0ff978..faec0ad 100644
--- a/src/Erebos/TextFormat/Ansi.hs
+++ b/src/Erebos/TextFormat/Ansi.hs
@@ -8,6 +8,8 @@ module Erebos.TextFormat.Ansi (
 ) where
 
 import Control.Applicative
+import Control.Monad.State
+import Control.Monad.Writer
 
 import Data.String
 import Data.Text (Text)
@@ -20,19 +22,38 @@ newtype AnsiText = AnsiText { fromAnsiText :: Text }
     deriving (Eq, Ord, Semigroup, Monoid, IsString)
 
 
+data RenderState = RenderState
+    { rsEndedWithNewline :: Bool
+    }
+
+initialRenderState :: RenderState
+initialRenderState = RenderState
+    { rsEndedWithNewline = True
+    }
+
 renderAnsiText :: FormattedText -> AnsiText
-renderAnsiText = AnsiText . go ( Nothing, Nothing )
+renderAnsiText ft = AnsiText $ T.concat $ execWriter $ flip evalStateT initialRenderState $ go ( Nothing, Nothing ) ft
   where
+    go :: ( Maybe Color, Maybe Color ) -> FormattedText -> StateT RenderState (Writer [ Text ]) ()
     go cur@( cfg, cbg ) = \case
-        PlainText text -> text
-        ConcatenatedText ftexts -> mconcat $ map (go cur) ftexts
-        FormattedText (CustomTextColor fg bg) ftext -> mconcat
-            [ ansiColor fg bg
-            , go ( fg <|> cfg, bg <|> cbg ) ftext
-            , ansiColor
+        PlainText text -> do
+            tell [ text ]
+            case T.unsnoc text of
+                Just ( _, c ) -> modify (\s -> s { rsEndedWithNewline = c == '\n' })
+                Nothing -> return ()
+        ConcatenatedText ftexts -> mconcat <$> mapM (go cur) ftexts
+        FormattedText (CustomTextColor fg bg) ftext -> do
+            tell [ ansiColor fg bg ]
+            go ( fg <|> cfg, bg <|> cbg ) ftext
+            tell [ ansiColor
                 (if fg /= cfg then cfg <|> Just DefaultColor else Nothing)
                 (if bg /= cbg then cbg <|> Just DefaultColor else Nothing)
-            ]
+                ]
+        EndWithNewline ftext -> do
+            go cur ftext
+            gets rsEndedWithNewline >>= \case
+                True -> return ()
+                False -> tell [ "\n" ] >> modify (\s -> s { rsEndedWithNewline = True })
 
 
 ansiColor :: Maybe Color -> Maybe Color -> Text
diff --git a/src/Erebos/TextFormat/Types.hs b/src/Erebos/TextFormat/Types.hs
index a03bc71..a93026d 100644
--- a/src/Erebos/TextFormat/Types.hs
+++ b/src/Erebos/TextFormat/Types.hs
@@ -12,6 +12,7 @@ data FormattedText
     = PlainText Text
     | ConcatenatedText [ FormattedText ]
     | FormattedText TextStyle FormattedText
+    | EndWithNewline FormattedText
 
 instance IsString FormattedText where
     fromString = PlainText . fromString
-- 
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