ditch bash script for custom setup

eugh, but this requires
"haskell.sessionLoading": "singleComponent"

Setup.hs

@@ -0,0 +1,14 @@
+import Distribution.Simple
+import Distribution.Simple.LocalBuildInfo
+import Distribution.Utils.Path
+import System.Directory
+
+main :: IO ()
+main =
+    defaultMainWithHooks
+        simpleUserHooks
+            -- place static lib in position for bundling
+            { buildHook = \pkg lbi hooks flags -> do
+                copyFile "rust/target/debug/libgarnet_rs.a" $ getSymbolicPath (buildDir lbi) </> "libgarnet_rs.a"
+                buildHook simpleUserHooks pkg lbi hooks flags
+            }

garnet.cabal

@@ -6,6 +6,13 @@ author: Patrick Aldis
 maintainer:
     george.thomas@obsidian.systems
     patrick.aldis@obsidian.systems
+build-type: Custom
+
+custom-setup
+    setup-depends:
+        base,
+        Cabal,
+        directory,
 
 common common
     default-language: GHC2024

generate-bindings

@@ -1,5 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-# place static lib in position for bundling with Cabal
-cp rust/target/debug/libgarnet_rs.a $(cabal list-bin . | sed -e 's=x/garnet/build/garnet/garnet=build=g')