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Fri Apr 23 11:34:26 EDT 2010

Haskell in Emacs: getting rid of :cd ~/.cabal on C-x C-l

In `inferior-haskell-load-file': annoying for debugging local modules:
the Hasell mode in Emacs apparently switches the current directory to
~/.cabal before loading the module.

How to avoid?

If I recall, it somehow tries to guess the proper directory, and if
it's not specified, it will set it to ".cabal".

See inf-haskell.el: It uses `default-directory' which is a variable
that automatically becomes buffer-local when set.  The problem seems
to be here:

  (inferior-haskell-find-project-root (get-buffer "Function.hs"))
  => "~/.cabal/"

Why is that?

  (inferior-haskell-cabal-of-buf (get-buffer "Function.hs"))
  => #<buffer .cabal>

Hmm..  Killing that buffer then messes up some state.  Killing+loading
the .hs buffer fixes that (some local variable is bound to the
buffer).  Digging deeper, the intelligence seems to be in
`haskell-cabal-find-file'.

Solution seems to be here[1]:

 (require 'inf-haskell)
 ;; Do not change directory to ~/.cabal on load
 (setq inferior-haskell-find-project-root nil)

[1] http://sites.google.com/site/haskell/notes/emacs




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