utop in emacs

[monadbobo]

My os is MAC 10.7.5 and emacs version is 24.3.

I add follow line to my emacs config(.emacs):

(load-file "~/.opam/system/share/emacs/site-lisp/utop.el")
(autoload 'utop "utop" "Toplevel for OCaml" t)
(autoload 'utop-setup-ocaml-buffer "utop" "Toplevel for OCaml" t)
(add-hook 'tuareg-mode-hook 'utop-setup-ocaml-buffer)
(add-hook 'typerex-mode-hook 'utop-setup-ocaml-buffer)

and run utop in emacs , and then output

Process utop exited with code 2

but i run utop in my terminal , everything is ok.

Thanks.

[ghost]

Can you check that ~/.opam/system/bin is in the PATH of your emacs process?

You can use the getenv function of emacs. For example press M-: then type:

(insert (replace-regexp-in-string ":" "\n" (getenv "PATH")))

If it is not this means that the environment variables of your emacs are not set correctly in order to use opam. Here is some emacs lisp code that should work, you can put it in your ~/.emacs:

(mapc
 (lambda (line)
   (when (string-match "\\(.*\\)=\\(.*\\)" line)
     (setenv (match-string 1 line) (match-string 2 line))))
 (split-string
  (shell-command-to-string "opam config -env")
  ";[ \r\n\t]*"))

[monadbobo]

Thanks, everything is ok now.

[manzyuk]

The documentation suggests setting utop-command to opam config exec "utop -emacs" if utop has been installed through opam. This solves the problem described here for me.

[Blaisorblade]

I needed to use (setq utop-command "opam config exec -- utop -emacs"). (EDITED).

First I tried (setq utop-command "opam config exec \"utop -emacs\""), but that didn't work (plus, opam config --help documents the latter syntax, not the former).

[Blaisorblade]

More importantly: I don't see documentation with this suggestion. Could this be added to the https://github.com/diml/utop/blob/master/README.md?

[ghost]

Sure, I updated the README