QCaml/top/install_printers.org

#+begin_src elisp tangle: no :results none :exports none
(setq pwd (file-name-directory buffer-file-name))
(setq name (file-name-nondirectory (substring buffer-file-name 0 -4)))
(setq lib (concat pwd "lib/"))
(setq testdir (concat pwd "test/"))
(setq mli (concat lib name ".mli"))
(setq ml  (concat lib name ".ml"))
(setq test-ml  (concat testdir name ".ml"))
(org-babel-tangle)
#+end_src 

* Intall printers 
  :PROPERTIES:
  :header-args: :noweb yes :comments both
  :END:

  Installs printers in the top-level environment.

  All printers are fetched automatically using the following script:
  
  #+NAME: printers
  #+begin_src sh :results output raw
grep "val pp " ../*/*.org \
    | grep -v docs \
    | cut -d ":" -f 1 \
    | sed 's|^../||' \
    | sed 's|.org|.pp" ;|' \
    | sed 's|/| |' \
    | sed 's/[^ ]*/\u&/g' \
    | sed 's| |.|' \
    | sed 's|^|"|' \
    | grep -v Top.Install_printers.pp
  #+end_src


  #+begin_src ocaml :tangle (eval ml) :exports none
let printers =
  [
    <<printers()>>
  ]

let eval_exn str =
  let lexbuf = Lexing.from_string str in
  let phrase = !Toploop.parse_toplevel_phrase lexbuf in
  Toploop.execute_phrase false Format.err_formatter phrase


let rec install_printers = function
  | [] -> eval_exn "#require \"lacaml.top\";;"
  | printer :: printers ->
      let cmd = Printf.sprintf "#install_printer %s;;" printer in
      eval_exn cmd && install_printers printers

let () =
  if not (install_printers printers) then
    Format.eprintf "Problem installing QCaml-printers@."

  #+end_src