Adding a Common Lisp wrapper.

Features:
  + configurable via environment variables
  + can skip the actual launching of the lisp implementation (source it
  with NIX_LISP_SKIP_CODE=1 to get all the settings)
  + currently supports SBCL, CLisp, ECL
  + determines lisp implementation from NIX_LISP_COMMAND variable or
  from buildInputs
  + sets ASDF search path for packages using buildInputs

pkgs/development/lisp-modules/clwrapper/setup-hook.sh

@@ -0,0 +1,33 @@
+NIX_LISP_ASDF="@asdf@"
+
+CL_SOURCE_REGISTRY="@asdf@/lib/common-lisp/asdf/:@asdf@/lib/common-lisp/asdf/uiop/"
+
+addASDFPaths () {
+    for j in "$1"/lib/common-lisp/*; do
+	if [ -d "$j" ]; then
+            CL_SOURCE_REGISTRY="$CL_SOURCE_REGISTRY:$j/"
+	fi
+    done
+}
+
+setLisp () {
+    if [ -z "$NIX_LISP_COMMAND" ]; then 
+      for j in "$1"/bin/*; do
+          case "$(basename "$j")" in
+              sbcl) NIX_LISP_COMMAND="$j" ;;
+              ecl) NIX_LISP_COMMAND="$j" ;;
+              clisp) NIX_LISP_COMMAND="$j" ;;
+          esac
+      done
+    fi
+    if [ -z "$NIX_LISP" ]; then 
+        NIX_LISP="${NIX_LISP_COMMAND##*/}"
+    fi
+}
+
+export NIX_LISP_COMMAND NIX_LISP CL_SOURCE_REGISTRY NIX_LISP_ASDF
+
+envHooks=(envHooks[@] addASDFPaths setLisp)
+
+mkdir -p "$HOME"/.cache/common-lisp || HOME="$TMP/.temp-$USER-home"
+mkdir -p "$HOME"/.cache/common-lisp