Install the following opam packages:
opam install caml-mode merlin ocp-indent
Tweak your .emacs file with some or all of the following:
; shift tab to complete
(global-set-key (kbd "S-<tab>") 'company-complete)
; Shell, needed to get correct env
(setq shell-command-switch "-lc")
(setq explicit-bash-args '("--login" "-i"))
; locate opam's site-lisp
(setq opam-share
(substring (shell-command-to-string
"opam config var share 2> /dev/null") 0 -1))
(add-to-list 'load-path (expand-file-name "emacs/site-lisp" opam-share))
; Compilation mode
(require 'compile)
(setq compilation-scroll-output 'first-error)
(setq compilation-always-kill t)
(setq next-error-highlight t)
; Company mode
(require 'company)
(add-hook 'after-init-hook 'global-company-mode)
(define-key company-active-map [tab] 'company-complete-selection)
(setq company-idle-delay nil)
; caml-mode
(add-to-list 'auto-mode-alist '("\\.ml[iylp]?$" . caml-mode))
(autoload 'caml-mode "caml" "Major mode for editing OCaml code." t)
(autoload 'run-caml "inf-caml" "Run an inferior OCaml process." t)
(autoload 'camldebug "camldebug" "Run ocamldebug on program." t)
(add-to-list 'interpreter-mode-alist '("ocamlrun" . caml-mode))
(add-to-list 'interpreter-mode-alist '("ocaml" . caml-mode))
(if window-system
(progn
(require 'caml-font)
(set-face-foreground 'caml-font-doccomment-face "#cb4b16")))
; merlin
(require 'merlin)
(require 'caml-types)
(require 'merlin-company)
;(add-to-list 'company-backends 'merlin-company-backend)
(add-hook 'caml-mode-hook 'merlin-mode t)
(setq merlin-use-auto-complete-mode 'easy)
(setq merlin-command 'opam)
(setq merlin-error-on-single-line t)
; ocp-indent
(require 'ocp-indent)
(setq ocp-indent-path
(concat
(replace-regexp-in-string "\n$" ""
(shell-command-to-string "opam config var bin")) "/ocp-indent"))
(setq ocp-indent-config "strict_with=always,match_clause=4,strict_else=never")
Title should read "Emacs setup for ocaml " :-)