ppx_embed_file is a simple PPX that allows embedding files directly into executables as strings or
bytes so that we can embed files into OCaml programs.
First, in your dune file, specify preprocess to include ppx_embed_file and
preprocessor_deps to include any files to be included:
$ cat test/dune
(library (
(name ppx_embed_test)
(libraries (core))
(preprocessor_deps (hello_world.txt))
(preprocess (pps (ppx_jane ppx_embed_file)))))Then, write the appropriate extension nodes in your .ml files:
open! Core
let hello_world_string = [%embed_file_as_string "hello_world.txt"]
let hello_world_string_with_filename =
[%embed_file_as_string_with_filename "hello_world.txt"]
;;
let%expect_test "string test" =
Core.print_string hello_world_string;
[%expect {xxx| Hello world! |xxx}]
;;
let%expect_test "string with filename test" =
[%sexp_of: string * string] hello_world_string_with_filename |> Core.print_s;
[%expect {xxx| (hello_world.txt "Hello world!\n") |xxx}]
;;