diff --git a/2022/d5/flake.nix b/2022/d5/flake.nix
index e986fc0..3faf300 100644
--- a/2022/d5/flake.nix
+++ b/2022/d5/flake.nix
@@ -14,16 +14,16 @@
           echo "This problem shares one input between two parts"
         '';
         py_pkgs = [ pkgs.python310 ];
-        lua_pkgs = [ (pkgs.lua.withPackages (luapkgs: [ luapkgs.busted luapkgs.luafilesystem ])) ];
-        fennel_pkgs = [ pkgs.lua.withPackages (luapkgs: [ luapkgs.fennel ]) ];
+        # lua_pkgs = [ (pkgs.lua.withPackages (luapkgs: [ luapkgs.busted luapkgs.luafilesystem ])) ];
+        fennel_pkgs = [ (pkgs.lua.withPackages (luapkgs: [ luapkgs.fennel luapkgs.readline ])) ];
       in
       {
         # Jack of all trades
         devShell = pkgs.mkShell {
           nativeBuildInputs = py_pkgs ++ fennel_pkgs;
           shellHook = ''
-            echo "> Default runtime. This contains both lua and python3 env"
-            echo "Run ./run-py.sh for Python's output and ./run-lua.sh for Lua's output"
+            echo "> Default runtime. This contains both fennel and python3 env"
+            echo "Run ./run-py.sh for Python's output and ./run-fnl.sh for Fennel's output"
           '' + shellHookAfter;
         };
         devShells = {
@@ -35,6 +35,17 @@
           #     echo "Run ./run-lua.sh to see the output of the solution"
           #   '' + shellHookAfter;
           # };
+
+          # nix develop ./#fennel
+          fennel = pkgs.mkShell
+            {
+              nativeBuildInputs = fennel_pkgs;
+              shellHook = ''
+                echo "> Fennel runtime"
+                echo "Run ./run-fnl.sh to see output of Fennel solution"
+              '' + shellHookAfter;
+            };
+
           # nix develop ./#python
           python = pkgs.mkShell {
             nativeBuildInputs = py_pkgs;
diff --git a/2022/d5/run-fnl.sh b/2022/d5/run-fnl.sh
new file mode 100755
index 0000000..fb8f971
--- /dev/null
+++ b/2022/d5/run-fnl.sh
@@ -0,0 +1,8 @@
+#!/usr/bin/env sh
+
+echo "example"
+fennel ./src/d5.fnl ./data/example.txt
+
+echo "submission"
+fennel ./src/d5.fnl ./data/submission.txt
+
diff --git a/2022/d5/src/d5.fnl b/2022/d5/src/d5.fnl
new file mode 100644
index 0000000..a597c64
--- /dev/null
+++ b/2022/d5/src/d5.fnl
@@ -0,0 +1,57 @@
+(local fennel (require :fennel)) 
+
+(fn pp [x] 
+  (print (fennel.view x)))
+
+(fn get-crates-insns [fileloc]
+  (let [file (assert (io.open fileloc :r))
+      contents (file:read "*a")
+      (crates instrs) ((string.gmatch contents "(.+)\n\n(.+)"))
+      ]
+    (file:close)
+    [crates instrs]))
+  
+(let [fileloc (. _G.arg 1)
+      (crates instrs) (get-crates-insns fileloc)
+      ]
+  ;; (pp contents)
+  ;; (print split)
+  (pp crates)
+  (pp instrs)
+)
+
+; REPL helpers
+(tset _G :arg ["./data/example.txt"]) ; provides hint for arg[1] to the REPL
+(assert (= (. _G.arg 1) "../data/example.txt"))
+(local fennel (require :fennel))
+
+(fn _G.pp [x]
+  (print (fennel.view x)))
+;; (_G.pp _G.arg)
+
+
+;; REPL sandbox
+; Function vs lambda: failure to pass a specific or nil variable
+;; (fn nilable [a b c]
+;;   (print a b c))
+;; (nilable 10 12)
+;;
+;; (lambda non-nilable [a b c]
+;;   (print a b c))
+;; (non-nilable 10 12)
+
+
+;; (let [(a b) ((string.gmatch "hello\nmy\nrandom\nstranger\n\nin\nthis\nsmall\nworld" "(.+)\n\n(.+)"))]
+;;   (_G.pp a)
+;;   (_G.pp b))
+
+;; (let [split ((string.gmatch "hello\nmy\nrandom\nstranger\n\nin\nthis\nsmall\nworld" "(.+)\n"))]
+;;   (_G.pp split)
+;;   )
+
+;; (fn overpass [a]
+;;   (print a)) (overpass "hello" "world")
+;;
+;; (lambda overpass [a]
+;;   (print a)) (overpass "hello" "world")
+