First, please know that I am a beginner with Dune and project management in Ocaml. Nevertheless, I have installed Dune and created a new Dune-project which deals with camlimages library, graphics, etc. Project compilation and execution works well when i do the usual:
- opam exec dune build
- opam exec dune exec ./myexecutable.exe
However, I can't use Tuareg Mode in emacs because the latter doesn't seem to find/understand well the dune-project configuration file standing for the former ".merlin" before dune v2.8 (according to the doc: https://dune.readthedocs.io/en/latest/usage.html?highlight=merlin). That implies lot of "unbound modules" errors when I try to launch the current .ml into the Tuareg repl.
I've tried to add packages manually with
- Merlin > Select packages
but Merlin does not seem to care about this, even though it appears in the merlin configuration file.
Some hypothesis:
Every time I want to access external "opam-installed" library/packages from dune, I need to launch Dune from Opam in order to access them instead of launching a simple "Dune" command into the shell. I feel the "Opam environment" is not accessible from the "shell environment". Does that play a role in my problem?
You could find some relevant information below, which might be useful to understand my problem:
- Merlin > Check configuration without adding packages manually
Loaded .merlin files: /home/erwan/Bureau/Nextcloud/GIT/Projet_integrateur_L3OPTIM/dev/importimg/dune-project Custom buffer settings: -packages: none -flags: "" -extensions: none Custom merlin setup: ((env "PATH=/home/erwan/.opam/default/bin") (command . "/home/erwan/.opam/default/bin/ocamlmerlin"))
- Dune file
(executable (name importimg) (libraries camlimages.core camlimages.png graphics camlimages.graphics))
- Tree structure of my project (as generated by dune)
.
├── _build
│ ├── default
│ │ ├── dune
│ │ ├── dune-project
│ │ ├── image.png
│ │ ├── importimg.exe
│ │ └── importimg.ml
│ └── log
├── dune
├── dune-project
├── image.png
├── #importimg.ml#
└── importimg.ml
- .emacs content
;; Basic .emacs with a good set of defaults, to be used as template for usage
;; with OCaml and OPAM
;;
;; Author: Louis Gesbert <louis.gesbert@ocamlpro.com>
;; Released under CC0
;; Generic, recommended configuration options
(custom-set-variables
;; custom-set-variables was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
'(ac-use-fuzzy nil)
'(backup-directory-alist (quote (("." . "~/.local/share/emacs/backups"))))
'(compilation-context-lines 2)
'(compilation-error-screen-columns nil)
'(compilation-scroll-output t)
'(compilation-search-path (quote (nil "src")))
'(custom-enabled-themes (quote (tango-dark)))
'(electric-indent-mode nil)
'(indent-tabs-mode nil)
'(line-move-visual t)
'(next-error-highlight t)
'(next-error-highlight-no-select t)
'(next-line-add-newlines nil)
'(require-final-newline t)
'(sentence-end-double-space nil)
'(show-paren-mode t)
'(show-trailing-whitespace t)
'(visible-bell t))
;; ANSI color in compilation buffer
(require 'ansi-color)
(defun colorize-compilation-buffer ()
(toggle-read-only)
(ansi-color-apply-on-region (point-min) (point-max))
(toggle-read-only))
(add-hook 'compilation-filter-hook 'colorize-compilation-buffer)
;; Some key bindings
(global-set-key [f3] 'next-match)
(defun prev-match () (interactive nil) (next-match -1))
(global-set-key [(shift f3)] 'prev-match)
(global-set-key [backtab] 'auto-complete)
;; OCaml configuration
;; - better error and backtrace matching
(defun set-ocaml-error-regexp ()
(set
'compilation-error-regexp-alist
(list '("[Ff]ile \\(\"\\(.*?\\)\", line \\(-?[0-9]+\\)\\(, characters \\(-?[0-9]+\\)-\\([0-9]+\\)\\)?\\)\\(:\n\\(\\(Warning .*?\\)\\|\\(Error\\)\\):\\)?"
2 3 (5 . 6) (9 . 11) 1 (8 compilation-message-face)))))
(add-hook 'tuareg-mode-hook 'set-ocaml-error-regexp)
(add-hook 'caml-mode-hook 'set-ocaml-error-regexp)
;; ## added by OPAM user-setup for emacs / base ## 56ab50dc8996d2bb95e7856a6eddb17b ## you can edit, but keep this line
(require 'opam-user-setup "~/.emacs.d/opam-user-setup.el")
;; ## end of OPAM user-setup addition for emacs / base ## keep this line
(custom-set-faces
;; custom-set-faces was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
)
- Versions
Merlin: 3.7.0
Dune: 2.1.3
Emacs: GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14) of 2020-03-26, modified by Debian
Opam: 2.0.5
Ocaml: 4.08.1
Thanks in advance
