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I try to install merlin by typing "opam install merlin" in the terminal. After the installation is done, I am asked to do this, but it doesn't seem to work. The github instruction seems to be different

enter image description here

(load "/Users/yxchng/.opam/system/share/emacs/site-lisp/tuareg-site-file")


(add-to-list 'load-path
"/Users/yxchng/.opam/system/share/emacs/site-lisp")
(require 'ocp-indent)


;; Add opam emacs directory to the load-path
(setq opam-share (substring (shell-command-to-string "opam config var
share 2> /dev/null") 0 -1))
(add-to-list 'load-path (concat opam-share "/emacs/site-lisp"))
;; Load merlin-mode
(require 'merlin)
;; Start merlin on ocaml files
(add-hook 'tuareg-mode-hook 'merlin-mode t)
(add-hook 'caml-mode-hook 'merlin-mode t)
;; Enable auto-complete
(setq merlin-use-auto-complete-mode 'easy)
;; Use opam switch to lookup ocamlmerlin binary
(setq merlin-command 'opam)

I added this code to .emacs but it doesn't seem to work

it gives me spurious error and says 

/usr/local/Cellar/emacs/24.5/Emacs.app/Contents/MacOS/Emacs: \
/bin/bash: opam: command not found/ocamlmerlin: No such file or directory

(linebreak added to prevent scrolling)

The error is like this

enter image description here How should I solve this problem?

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  • 1
    Can you make sure the argument to shell-command-to-string is spelled correctly? I don't know what it should look like, but right now it looks like some bits are missing. Does it have to have a linebreak there? – wvxvw May 3 '15 at 7:57
  • @wvxvw i am not sure too, i just copy and paste from the instruction given. Thats why I need some help – user10024395 May 3 '15 at 8:12
  • 1
    "i just copy and paste from the instruction given" -- It might help to see the instructions you are trying to follow in context. Please add an appropriate link to your question. – itsjeyd May 3 '15 at 8:36
  • @itsjeyd edited – user10024395 May 3 '15 at 8:55
  • Can you actually run "opam config var share" on the command line? Is "opam" in your PATH? – rekado May 3 '15 at 9:17
6

OS X does not evaluate your shell configuration for GUI applications. Hence, your Emacs runs with a different $PATH than your shell, and thus can't find the opam executable.

The exec-path-from-shell package helps you to work around this issue. Simply install the package with M-x package-install and then add the following to your init file:

(when (memq window-system '(mac ns))
  (exec-path-from-shell-initialize))

Likewise, I'd recommend you to install Merlin via M-x package-install RET merlin, because that makes all the load-path management in your init file redundant, and reduces your OPAM configuration to:

(add-hook 'tuareg-mode-hook #'merlin-mode)
(add-hook 'caml-mode-hook #'merlin-mode) ; If you really like to use Caml Mode

(with-eval-after-load 'merlin
  (setq merlin-command 'opam))
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