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scala-mode-feature-electric.el
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;;; -*-Emacs-Lisp-*-
;;; scala-mode-feature-electric.el - electric editing commands for scala files
;; Copyright (C) 2009 by Hemant Kumar (gethemant at gmail to com)
;; Modified by Anders Bach Nielsen <andersbach.nielsen at epfl dot ch> to fit into the scala mode
;; Based on ruby-electric by Dee Zsombor <dee dot zsombor at gmail dot com>.
;; Keywords: scala languages oop
;;; License
;; SCALA LICENSE
;;
;; Copyright (c) 2002-2011 EPFL, Lausanne, unless otherwise specified.
;; All rights reserved.
;;
;; This software was developed by the Programming Methods Laboratory of the
;; Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.
;;
;; Permission to use, copy, modify, and distribute this software in source
;; or binary form for any purpose with or without fee is hereby granted,
;; provided that the following conditions are met:
;;
;; 1. Redistributions of source code must retain the above copyright
;; notice, this list of conditions and the following disclaimer.
;;
;; 2. Redistributions in binary form must reproduce the above copyright
;; notice, this list of conditions and the following disclaimer in the
;; documentation and/or other materials provided with the distribution.
;;
;; 3. Neither the name of the EPFL nor the names of its contributors
;; may be used to endorse or promote products derived from this
;; software without specific prior written permission.
;;
;;
;; THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;; ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
;; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
;; SUCH DAMAGE.
;;; Code
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(provide 'scala-mode-feature-electric)
;; Customization
(defgroup scala-mode-feature:electric nil
"Minor mode providing electric editing commands for scala files"
:group 'scala)
(defcustom scala-mode-feature:electric-expand-delimiters-list '(all)
"*List of contexts where matching delimiter should be
inserted. The word 'all' will do all insertions."
:type '(set :extra-offset 8
(const :tag "Everything" all )
(const :tag "Curly brace" ?\{ )
(const :tag "Square brace" ?\[ )
(const :tag "Round brace" ?\( )
(const :tag "Quote" ?\' )
(const :tag "Double quote" ?\" )
(const :tag "Back quote" ?\` )
(const :tag "Vertical bar" ?\| ))
:group 'scala-mode-feature:electric)
(defcustom scala-mode-feature:electric-newline-before-closing-bracket nil
"*Controls whether a newline should be inserted before the
closing bracket or not."
:type 'boolean
:group 'scala-mode-feature:electric)
(defcustom scala-mode-feature:electric-on-per-default nil
"*Controls whether scala electric mode should be on per default or not."
:type 'boolean
:group 'scala-mode-feature:electric)
;; Variables
(defvar scala-mode-feature-electric-matching-delimeter-alist
'((?\[ . ?\])
(?\( . ?\))
(?\' . ?\')
(?\` . ?\`)
(?\" . ?\")))
(defvar scala-mode-feature-electric-mode scala-mode-feature:electric-on-per-default
"nil disables scala electric mode, non-nil enables.")
(defvar scala-mode-feature-electric-mode-map (make-sparse-keymap)
"Keymap for scala electric minor mode.")
;;; Mode setup
(make-variable-buffer-local 'scala-mode-feature-electric-mode)
(defun scala-mode-feature-electric-mode (&optional arg)
""
(interactive "P")
(setq scala-mode-feature-electric-mode
(if (null arg)
;; Toggle mode
(not scala-mode-feature-electric-mode)
;; Enable/Disable according to arg
(> (prefix-numeric-value arg) 0)))
)
;; Alias for some backwards compat
(defalias 'scala-electric-mode 'scala-mode-feature-electric-mode)
;; Functions
(defun scala-mode-feature-electric-active-p ()
scala-mode-feature-electric-mode)
(defun scala-mode-feature-electric-code-at-point-p()
(and scala-mode-feature-electric-mode
(let* ((properties (text-properties-at (point))))
(and (null (memq 'font-lock-string-face properties))
(null (memq 'font-lock-comment-face properties))))))
(defun scala-mode-feature-electric-string-at-point-p()
(and scala-mode-feature-electric-mode
(consp (memq 'font-lock-string-face (text-properties-at (point))))))
(defun scala-mode-feature-electric-is-last-command-char-expandable-punct-p()
(or (memq 'all scala-mode-feature:electric-expand-delimiters-list)
(memq last-command-char scala-mode-feature:electric-expand-delimiters-list)))
(defun scala-mode-feature-electric-curlies(arg)
(interactive "P")
(self-insert-command (prefix-numeric-value arg))
(if (scala-mode-feature-electric-is-last-command-char-expandable-punct-p)
(cond ((scala-mode-feature-electric-code-at-point-p)
(insert " ")
(save-excursion
(if scala-mode-feature:electric-newline-before-closing-bracket
(newline))
(insert "}")))
((scala-mode-feature-electric-string-at-point-p)
(save-excursion
(backward-char 1)
(when (char-equal ?\# (preceding-char))
(forward-char 1)
(insert "}")))))))
(defun scala-mode-feature-electric-matching-char(arg)
(interactive "P")
(self-insert-command (prefix-numeric-value arg))
(and (scala-mode-feature-electric-is-last-command-char-expandable-punct-p)
(scala-mode-feature-electric-code-at-point-p)
(save-excursion
(insert (cdr (assoc last-command-char
scala-mode-feature-electric-matching-delimeter-alist))))))
(defun scala-mode-feature-electric-install ()
(or (assoc 'scala-mode-feature-electric-mode minor-mode-alist)
(setq minor-mode-alist
(cons '(scala-mode-feature-electric-mode " electric") minor-mode-alist)))
(or (assoc 'scala-mode-feature-electric-mode minor-mode-map-alist)
(setq minor-mode-map-alist
(cons (cons 'scala-mode-feature-electric-mode scala-mode-feature-electric-mode-map)
minor-mode-map-alist)))
(define-key scala-mode-feature-electric-mode-map "{" 'scala-mode-feature-electric-curlies)
(define-key scala-mode-feature-electric-mode-map "(" 'scala-mode-feature-electric-matching-char)
(define-key scala-mode-feature-electric-mode-map "[" 'scala-mode-feature-electric-matching-char)
(define-key scala-mode-feature-electric-mode-map "\"" 'scala-mode-feature-electric-matching-char)
t)