bulk: add PoC of vim-like modular editor

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/util.ml b/lib/util.ml
new file mode 100644
index 0000000..9ad3b59
--- /dev/null
+++ b/lib/util.ml
@@ -0,0 +1,26 @@
+(** The infamous [Util] module. A graveyard of broken expressions. *)
+
+open Base
+
+(** [f &> g] composes [g] with [f] to obrain [fun x -> g (f x)];
+    in other words, it applies [f] {i and then} [g].
+
+    @param f the first funtion to apply.
+    @param g the second function to apply.
+    @return the composition of [g] with [f]. *)
+let ( &> ) f g = Fn.compose g f
+
+(** Turn a sequence of bytes into a sequence.
+
+    @param b the input bytes.
+    @return a sequence of bytes. *)
+let sequence_of_bytes (b : Bytes.t) : char Sequence.t =
+  let open Sequence.Generator in
+  let traverse b =
+    let len = Bytes.length b in
+    let rec loop i _ =
+      if i >= len then return () else yield (Bytes.get b i) >>= loop (i + 1)
+    in
+    loop 0 ()
+  in
+  traverse b |> run