idris: Move library setup to the setup hook.

This was broken in preHook because addEnvHooks isn't defined yet.

pkgs/development/idris-modules/build-idris-package.nix

···
 # args: Additional arguments to pass to mkDerivation. Generally should include at least
 #       name and src.
 { stdenv, idris, gmp }: args: stdenv.mkDerivation ({
-  preHook = ''
-    # Library import path
-    export IDRIS_LIBRARY_PATH=$PWD/idris-libs
-    mkdir -p $IDRIS_LIBRARY_PATH
-
-    # Library install path
-    export IBCSUBDIR=$out/lib/${idris.name}
-    mkdir -p $IBCSUBDIR
-
-    addIdrisLibs () {
-      if [ -d $1/lib/${idris.name} ]; then
-        ln -sv $1/lib/${idris.name}/* $IDRIS_LIBRARY_PATH
-      fi
-    }
-
-    # All run-time deps
-    addEnvHooks 0 addIdrisLibs
-  '';
-
   buildPhase = ''
-    ${idris}/bin/idris --build *.ipkg
+    idris --build *.ipkg
   '';
 
   doCheck = true;
 
   checkPhase = ''
     if grep -q test *.ipkg; then
-      ${idris}/bin/idris --testpkg *.ipkg
+      idris --testpkg *.ipkg
     fi
   '';
 
   installPhase = ''
-    ${idris}/bin/idris --install *.ipkg --ibcsubdir $IBCSUBDIR
+    idris --install *.ipkg --ibcsubdir $IBCSUBDIR
   '';
 
-  buildInputs = [ gmp ];
+  buildInputs = [ gmp idris ];
 } // args)

pkgs/development/idris-modules/idris-wrapper.nix

···
     wrapProgram $out/bin/idris \
       --suffix PATH : ${ stdenv.lib.makeBinPath path } \
       --suffix LIBRARY_PATH : ${stdenv.lib.makeLibraryPath lib}
+
+    mkdir -p $out/nix-support
+    substituteAll ${./setup-hook.sh} $out/nix-support/setup-hook
       '';
   }
 

pkgs/development/idris-modules/setup-hook.sh

···
+# Library import path
+export IDRIS_LIBRARY_PATH=$PWD/idris-libs
+mkdir -p $IDRIS_LIBRARY_PATH
+
+# Library install path
+export IBCSUBDIR=$out/lib/@name@
+mkdir -p $IBCSUBDIR
+
+addIdrisLibs () {
+  if [ -d $1/lib/@name@ ]; then
+    ln -sv $1/lib/@name@/* $IDRIS_LIBRARY_PATH
+  fi
+}
+
+# All run-time deps
+addEnvHooks 1 addIdrisLibs