Easy typing of Unicode symbols in Emacs, tailored for Haskell sources
Emacs Lisp
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Emacs Haskell Unicode input method

This package provides haskell-unicode-input-method, an input method which allows you to easily type a number of Unicode symbols that are useful when writing Haskell code.

To automically load in haskell-mode put the following code in your .emacs file:

(require 'haskell-unicode-input-method)
(add-hook 'haskell-mode-hook 
  (lambda () (set-input-method "haskell-unicode")))

Make sure the directory containing the .el file is in your load-path, for example:

(add-to-list 'load-path "~/.elisp/emacs-haskell-unicode-input-method")

To manually enable use M-x set-input-method or C-x RET C-\ with haskell-unicode. Note that the elisp file must be evaluated for this to work.

Now you can simply type -> and it is immediately replaced with . Use C-\ to toggle the input method. To see a table of all key sequences use M-x describe-input-method haskell-unicode. A sequence like <= is ambiguous and can mean either or . Typing it presents you with a choice. Type 1 or 2 to select an option or keep typing to use the default option.

If you don't like the highlighting of partially matching tokens you can turn it off:

(setq input-method-highlight-flag nil)