This package provides scalaz-unicode-input-method, an input method which allows you to easily type a number of Unicode symbols that are useful when writing Scala code using Scalaz library.

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

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

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

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

To manually enable use M-x set-input-method or C-x RET C-\ with scalaz-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 scalaz-unicode. A sequence like contains 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)

If using with evil-mode, consider adding the following to your config:

;; Only enable unicode mode for insert and emacs states in evil-mode
(add-hook 'evil-insert-state-entry-hook
            (lambda () (set-input-method "scalaz-unicode")))
(add-hook 'evil-insert-state-exit-hook
            (lambda () (set-input-method nil)))
(add-hook 'evil-emacs-state-entry-hook
            (lambda () (set-input-method "scalaz-unicode")))
(add-hook 'evil-emacs-state-exit-hook
            (lambda () (set-input-method nil)))