[Haskell-cafe] Correctly setting up emacs + ghc-mod

Arnaud Bailly arnaud.oqube at gmail.com
Sun Apr 20 08:20:56 UTC 2014

This is what I have in my cabal file:

    hs-source-dirs: ., fay-shared
    exposed-modules: Application
but I keep getting same error when loading a file that depends on the fay-shared directory (please not that command-line building with cabal runs fine so this is definitely an issue with my emacs settings).

Here is the output I got in haskell interpreter when loading a file that depends on fay-shared/SharedTypes.hs:

GHCi is ignoring: /home/vagrant/yesod-splittest/.ghci (run M-x haskell-process-unignore)                                                                                                                   
The next big Haskell project is about to start!
If I break, you can:
  1. Restart:           M-x haskell-process-restart
  2. Configure logging: C-h v haskell-process-log (useful for debugging)
  3. General config:    M-x customize-mode
  4. Hide these tips:   C-h v haskell-process-show-debug-tips
Changed directory: /home/vagrant/yesod-splittest/
Import.hs:18:18-28: Could not find module `SharedTypes' …                                                                                                                                                  
    Use -v to see a list of the files searched for.                                                                                                                                                        
Compilation failed.                                                                                                                                                                                        
Import.hs:18:18-28: Could not find module `SharedTypes' …                                                                                                                                                  
    Use -v to see a list of the files searched for.                                                                                                                                                        
Compilation failed.                                                                                                                                                                                        


On 19 Apr 2014, at 13:05, Andras Slemmer <0slemi0 at gmail.com> wrote:

> If you're using several source directories then simply specify them in your .cabal with hs-source-dirs. So for example if you have a library in src/lib and a test-suite in src/test and your tests use your lib then you'd have something like this in your .cabal
> library
>   exposed-modules: Lib
>   hs-source-dirs: src/lib
> test-suite sometest
>   type:           exitcode-stdio-1.0
>   main-is:        Test.hs
>   hs-source-dirs: src/test src/lib
> On 18 April 2014 16:20, Arnaud Bailly <arnaud.oqube at gmail.com> wrote:
> Hello,
> I am struggling to get my emacs settings right for doing significant Haskell development, eg. something more involved than a bunch of source files in a single directory. The issue I am running in currently is that when trying to load files in the interpreter, most source paths are missing which means loading inevitably fails. This is especially annoying with tests: To get things working correctly I need to explicitly add in the console
> > :set -iwhere/my/src/are
> Is there any configuration I should be aware of in my cabal files or .emacs file that would correctly set the source roots? Am I missing something?
> Here is my .emacs configuration. Thanks for any help.
> ;; haskell coding                                                                                                                                                                                           
> (require 'auto-complete)
> (require 'haskell-mode)
> (require 'haskell-cabal)
> (autoload 'ghc-init "ghc" nil t)
> (add-hook 'haskell-mode-hook (lambda () (ghc-init)))
> (eval-after-load "haskell-mode"
>   '(progn
>      (setq haskell-stylish-on-save t)
>      (setq haskell-process-args-cabal-repl '("--ghc-option=-ferror-spans"
>                "--with-ghc=ghci-ng"))
>      (define-key haskell-mode-map (kbd "C-,") 'haskell-move-nested-left)
>      (define-key haskell-mode-map (kbd "C-.") 'haskell-move-nested-right)
>      (define-key haskell-mode-map (kbd "C-c v c") 'haskell-cabal-visit-file)
>      (define-key haskell-mode-map (kbd "C-c C-c") 'haskell-compile)
>      (define-key haskell-mode-map (kbd "C-x C-d") nil)
>      (setq haskell-font-lock-symbols t)
>      ;; Do this to get a variable in scope                                                                                                                                                                  
>      (auto-complete-mode)
>      ;; from http://pastebin.com/tJyyEBAS                                                                                                                                                                   
>      (ac-define-source ghc-mod
>        '((depends ghc)
>          (candidates . (ghc-select-completion-symbol))
>          (symbol . "s")
>          (cache)))
>      (defun my-ac-haskell-mode ()
>        (setq ac-sources '(ac-source-words-in-same-mode-buffers
>                           ac-source-dictionary
>                           ac-source-ghc-mod)))
>      (add-hook 'haskell-mode-hook 'my-ac-haskell-mode)
>      (defun my-haskell-ac-init ()
>        (when (member (file-name-extension buffer-file-name) '("hs" "lhs"))
>          (auto-complete-mode t)
>          (setq ac-sources '(ac-source-words-in-same-mode-buffers
>                             ac-source-dictionary
>                             ac-source-ghc-mod))))
>      (add-hook 'find-file-hook 'my-haskell-ac-init)))
> (add-hook 'haskell-mode-hook 'turn-on-haskell-decl-scan)
> (add-hook 'haskell-mode-hook 'turn-on-haskell-indentation)
> (eval-after-load "which-func"
>   '(add-to-list 'which-func-modes 'haskell-mode))
> (eval-after-load "haskell-cabal"
>     '(define-key haskell-cabal-mode-map (kbd "C-c C-c") 'haskell-compile))
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