update

.envrc

@@ -0,0 +1 @@
+export OCAMLRUNPARAM=b

README.md

@@ -0,0 +1,3 @@
+# bk910x
+
+meow

bin/dune

@@ -1,4 +1,5 @@
 (executable
  (public_name bk910x)
  (name main)
- (libraries eio_main bk910x))
+ (preprocess (pps xlog.ppx))
+ (libraries bk910x eio_main xlog))

bin/main.ml

@@ -1,8 +1,17 @@
-open Eio.Std
+[%%xlog_import]
+
+let () =
+  Xlog.init_pretty_writer stdout
+    ~min_level:Xlog.DEBUG
+
+let main ~env =
+  ignore env;
+  [%xlog info "meow meow meow"];
+  try
+    failwith "meow"
+  with e -> [%xlog exn e "oop's"]
 
-let main out =
-  Eio.Flow.copy_string "Hello, world!\n" out
 
 let () =
   Eio_main.run @@ fun env ->
-    main (Eio.Stdenv.stdout env)
+    main ~env

lib/bk910x.ml

@@ -0,0 +1 @@
+module Eio_serial = Eio_serial

lib/dune

@@ -1,3 +1,4 @@
 (library
  (name bk910x)
- (libraries eio))
+ (public_name bk910x)
+ (libraries eio xlog))

package.nix

@@ -5,6 +5,7 @@
   buildDunePackage,
   eio,
   eio_main,
+  xlog,
 
   ocaml,
   dune_3,
@@ -29,7 +30,7 @@ in buildDunePackage rec {
   minimalOCamlVersion = "5.1";
   dontStrip = true;
 
-  propagatedBuildInputs = [ eio eio_main ];
+  propagatedBuildInputs = [ eio eio_main xlog ];
 
   nativeBuildInputs = lib.optionals enableShell [
     ocaml dune_3 odoc utop