make laantas-script usable as a library

laantas-script/laantas-script.cabal

@@ -7,14 +7,7 @@ license: AGPL-3.0-or-later
 author: Rhiannon Morris <rhi@rhiannon.website>
 maintainer: Rhiannon Morris <rhi@rhiannon.website>
 
-executable laantas-script
-  hs-source-dirs: .
-  main-is: Main.hs
-  other-modules:
-    Svg,
-    Glyphs,
-    GlyphsBase,
-    Split
+common base
   default-language: Haskell2010
   default-extensions:
     BlockArguments,
@@ -37,5 +30,19 @@ executable laantas-script
     optparse-applicative ^>= 0.16.0.0,
     text ^>= 2.1,
     megaparsec ^>= 9.6.1
-  ghc-options:
-    -Wall -threaded -rtsopts -with-rtsopts=-N
+  ghc-options: -Wall
+
+library
+  import: base
+  hs-source-dirs: lib
+  exposed-modules:
+    Svg,
+    Glyphs,
+    GlyphsBase,
+    Split
+
+executable laantas-script
+  import: base
+  hs-source-dirs: main
+  main-is: Main.hs
+  build-depends: laantas-script

laantas-script/lib/Glyphs.hs

@@ -1,7 +1,8 @@
 {-# OPTIONS_GHC -Wno-missing-signatures -Wno-name-shadowing #-}
 
 module Glyphs
-  (Glyph (..), Diacritic, simpleDia, Segs (..), EGlyph, Word, doGlyphs,
+  (Glyph (..), Diacritic, simpleDia, Segs (..), EGlyph, Word,
+   doGlyphs, doGlyphsNoDoctype,
    withSize,
    charHeight', lineHeight', spaceWidth', gap',
    charHeight, lineHeight, spaceWidth, gap,

laantas-script/lib/GlyphsBase.hs

@@ -94,8 +94,8 @@ type Diacritic = Diacritic' Double
 simpleDia :: Segs -> Diacritic
 simpleDia ss (SI {width}) = (ss, width)
 
-doGlyphs :: [Word] -> Env -> Element
-doGlyphs gs e = wrap $ run act e where
+doGlyphsNoDoctype :: [Word] -> Env -> Element
+doGlyphsNoDoctype gs e = wrap $ run act e where
   act = do
     E {stroke, color} <- ask
     let gattrs = [Stroke_ <<- color, Stroke_width_ <<- toPx stroke,
@@ -104,7 +104,10 @@ doGlyphs gs e = wrap $ run act e where
     g_ gattrs . mconcat <$> traverse placeWord gs <* newline
   wrap (content, T {width, height}) =
     let sattrs = [Height_ <<- toPx height, Width_ <<- toPx width] in
-    doctype <> svg11_ content `with` sattrs
+    svg11_ content `with` sattrs
+
+doGlyphs :: [Word] -> Env -> Element
+doGlyphs gs e = doctype <> doGlyphsNoDoctype gs e
 
 
 liftDia :: Diacritic -> Diacritic' SizeInfo