build error

.gitignore

@@ -1,3 +1,4 @@
 lib
+include
 result*
 dist-newstyle

flake.nix

@@ -26,7 +26,9 @@
       libXi,
       xrandr,
       # shell deps
+      clang,
       hs-bindgen-cli,
+      tree,
     }:
       mkDerivation {
         pname = "hs-rgfw";
@@ -44,9 +46,9 @@
           libXi
           xrandr
         ];
-        preBuild = ''
+        preConfigure = ''
           set -x
-          export PATH=${hs-bindgen-cli}/bin:$PATH
+          export PATH=${clang}/bin:${hs-bindgen-cli}/bin:${tree}/bin:$PATH
           ./generate.sh
           set +x
         '';

generate.sh

@@ -1,11 +1,51 @@
-echo "#"
-echo "# generating library RGFW.Generated in folder lib"
-echo "#"
+set -x
+echo "# copying header..."
+
+mkdir -p lib/include
+cp rgfw/RGFW.h lib/include/RGFW.h
+
+echo "# creating flags for hs-bindgen-cli..."
+
+export CFLAGS=$(pkg-config --cflags x11 xcursor xrandr xi gl xrender xext xfixes)
+HBC_ARGS=""
+
+for token in $CFLAGS; do
+  case "$token" in
+    -I* ) HBC_ARGS="$HBC_ARGS $token" ;;
+    -D* ) HBC_ARGS="$HBC_ARGS --define-macro ${token#-D}" ;;
+    *   ) HBC_ARGS="$HBC_ARGS --clang-option $token" ;;
+  esac
+done
+
+echo "# creating c file from header..."
+
+cat > lib/RGFW.c <<EOF
+#define RGFW_IMPLEMENTATION
+#define RGFW_OPENGL
+#define RGFW_EXPORT
+#include "RGFW.h"
+EOF
+
+echo "# creating c object file..."
+
+clang -c lib/RGFW.c -o lib/RGFW.o $CFLAGS -Ilib/include
+
+echo "# generating library RGFW.Generated..."
+
 hs-bindgen-cli preprocess \
-  -Irgfw \
+  -Ilib/include \
+  --parse-from-main-header-dirs \
   --create-output-dirs \
   --overwrite-files \
   --hs-output-dir lib \
   --module RGFW.Generated \
-  --clang-option=-DRGFW_OPENGL \
+  --define-macro=RGFW_OPENGL \
+  --define-macro=RGFW_EXPORT \
+  --define-macro=RGFW_IMPLEMENTATION \
+  $HBC_ARGS \
   RGFW.h
+
+echo "# file tree generated:"
+tree lib
+
+set +x

hs-rgfw.cabal

@@ -8,20 +8,38 @@ maintainer: Matrix @andromeda:tchncs.de
 build-type: Simple
 extra-doc-files: README.md
 common warnings
-  ghc-options: -Wall
+  ghc-options:
+    -Wall
+    -DRGFW_IMPLEMENTATION
+    -DRGFW_OPENGL
+    -- the following irresponsibly copy-pasted from `nix develop --command "pkg-config --libs --cflags <lots of things>`
+    -I/nix/store/b608h3ylrhrwpi9bc0y0014jf7j03pzl-libglvnd-1.7.0-dev/include -I/nix/store/sbhg4bnrg0l22936dbwrnl33vzd3kcmf-libx11-1.8.12-dev/include -I/nix/store/l7mab2s2kjsz2pz8dfgvh39af7w7gji1-xorgproto-2024.1/include -I/nix/store/7ys6dfy22hkm2bklwq7ll7pmby443fka-libxcursor-1.2.3-dev/include -I/nix/store/jb2w03lbwm7j01zn9qzcnnqcc1ca5dyj-libxi-1.8.2-dev/include -I/nix/store/1315vzcs2vm98pgsdzwsxm7i2mzjc0g7-libxext-1.3.6-dev/include -I/nix/store/vr2rj7zz28zvsnycx45kn6hhim0ky94z-libxfixes-6.0.2-dev/include -I/nix/store/wkrn5svcggds11pbkyjfka7b2i3wbmhj-libxrender-0.9.12-dev/include -I/nix/store/s7q5sdki2ax8gla778mbhddf5v9gk4vb-libxrandr-1.5.4-dev/include -L/nix/store/mm4v6w3wj8wi5qc6rwdrb2rkqs08whp9-libglvnd-1.7.0/lib -L/nix/store/ja09m2gfni7pqk4bsrhjb8y9cq74rspp-libx11-1.8.12/lib -L/nix/store/ldl1g8r8jfhjv4asb7zkr7ljpgk7q6dv-libxcursor-1.2.3/lib -L/nix/store/xg9763xyrnkxhvqgvxdbfiwxnmz391rx-libxi-1.8.2/lib -L/nix/store/55071y2xjibw8f317scvlg788w31k7k8-libxext-1.3.6/lib -L/nix/store/i6mb757zbagjs50kh7n9sk51f7wsr5f3-libxfixes-6.0.2/lib -L/nix/store/dgjd3hf8ny62vbjg10w64x4jwm7cv81k-libxrender-0.9.12/lib -L/nix/store/llr8wn0a3q8vfrg6i7vr2l2k66izm56a-libxrandr-1.5.4/lib -lXcursor -lXrandr -lXi -lGL -lXrender -lX11 -lXext -lXfixes
+    lib/RGFW.c
+    -fPIC
 
 library
   import: warnings
-  exposed-modules: RGFW.Generated
+  exposed-modules:
+    , RGFW.Generated
+    , RGFW.Generated.FunPtr
+    , RGFW.Generated.Safe
+    , RGFW.Generated.Unsafe
   build-depends:
     , base
     , primitive
     , c-expr-runtime
     , hs-bindgen-runtime
-  include-dirs: rgfw
+  pkgconfig-depends:
+    , gl
+    , x11
+    , xcursor
+    , xrandr
+    , xi
+  include-dirs: lib/include
   hs-source-dirs: lib
   default-language: Haskell2010
   default-extensions: FlexibleInstances
+  c-sources: lib/RGFW.c
 
 executable hs-rgfw
   import: warnings
@@ -37,6 +55,6 @@ executable hs-rgfw
     , xcursor
     , xrandr
     , xi
-  include-dirs: rgfw
+  include-dirs: lib/include
   hs-source-dirs: src
   default-language: Haskell2010

src/Main.hs

@@ -1,6 +1,10 @@
 module Main where
 
+import qualified Foreign.Ptr (ToFunPtr)
+
 import qualified RGFW.Generated as RGFW
 
 main :: IO ()
-main = putStrLn "Hello World"
+main = do
+  putStrLn "Hello World"
+  window <- toFunPtr ()