Switch to Hooks API instead of using cabal configure hack for lib/include dirs

SetupHooks.hs

@@ -0,0 +1,33 @@
+{-# LANGUAGE DisambiguateRecordFields #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NoFieldSelectors #-}
+
+module SetupHooks (setupHooks) where
+
+import Distribution.Simple.SetupHooks
+import Distribution.Utils.Path
+import System.Directory
+
+setupHooks :: SetupHooks
+setupHooks =
+    noSetupHooks
+        { configureHooks =
+            noConfigureHooks
+                { preConfComponentHook = Just addRustLibDir
+                }
+        }
+
+addRustLibDir :: PreConfComponentInputs -> IO PreConfComponentOutputs
+addRustLibDir inputs = do
+    cwd <- getCurrentDirectory
+    pure
+        (noPreConfComponentOutputs inputs :: PreConfComponentOutputs)
+            { componentDiff =
+                buildInfoComponentDiff
+                    (componentName (component inputs))
+                    emptyBuildInfo
+                        { extraLibDirs =
+                            [ makeSymbolicPath $ cwd </> "rust" </> "target" </> "debug"
+                            ]
+                        }
+            }

garnet.cabal

@@ -1,4 +1,4 @@
-cabal-version: 3.0
+cabal-version: 3.14
 name: garnet
 version: 0.1.0.0
 license: BSD-3-Clause
@@ -6,6 +6,14 @@ author: Patrick Aldis
 maintainer:
     george.thomas@obsidian.systems
     patrick.aldis@obsidian.systems
+build-type: Hooks
+
+custom-setup
+    setup-depends:
+        base,
+        Cabal-hooks,
+        Cabal-syntax,
+        directory,
 
 common common
     default-language: GHC2024
@@ -40,6 +48,7 @@ library
         GarnetRs.Raw
         GarnetRs.Wrapped
     hs-source-dirs: lib
+    include-dirs: rust/target/debug
     extra-bundled-libraries: garnet_rs
     build-depends:
         base,

generate-bindings

@@ -9,12 +9,11 @@ set -euo pipefail
 #   1. cargo build       - build the Rust static library
 #   2. cbindgen           - generate a C header from the Rust source
 #   3. awk                - patch the header for hs-bindgen compatibility
-#   4. cabal configure    - point Cabal at the Rust build artifacts
 #
 # System include paths (needed by libclang on NixOS) are detected
 # automatically at TH compile time by GarnetRs.Raw — no env vars needed.
 #
-# Prerequisites: run inside the Nix dev shell (provides gcc, cabal, cbindgen).
+# Prerequisites: run inside the Nix dev shell (provides gcc, cbindgen).
 
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 RUST_DIR="$SCRIPT_DIR/rust"
@@ -58,15 +57,5 @@ awk '
 
 echo "  Patched header at $HEADER"
 
-# --- Step 4: Configure Cabal ---
-#
-# Point Cabal at the Rust static library and C header. This writes
-# cabal.project.local (gitignored) with absolute paths derived from
-# the current working directory, avoiding hardcoded paths in cabal.project.
-echo "=== Configuring Cabal ==="
-cabal configure \
-  --extra-lib-dirs="$RUST_DIR/target/debug" \
-  --extra-include-dirs="$RUST_DIR/target/debug"
-
 echo "=== Done ==="
 echo "Run 'cabal run' to test."