;;; dict-mode.el --- major mode for dict dictionary source files

;; Copyright (C) 2011 by Oleksandr Gavenko <gavenkoa@gmail.com>

;; You can do anything with this file without any warranty.

;; Author: Oleksandr Gavenko <gavenkoa@gmail.com>
;; Maintainer: Oleksandr Gavenko <gavenkoa@gmail.com>
;; Created: 2011-09-04
;; Version: 0.1
;; Keywords: dict, dictionary

;;; Commentary:
;;
;; Very pure release.

;;; Code:

(defvar dict-c5-font-lock-keywords
  '(
    ("^\\(_\\{5,\\}\\)\n\n\\(\\w.*\\)$"
     (1 font-lock-function-name-face) (2 font-lock-keyword-face))
    ("\\[[^]\n]+]" . font-lock-type-face)
    ))

(eval-when-compile
  (defvar font-lock-beg)
  (defvar font-lock-end))

(defun dict-c5-font-lock-extend-region ()
  "Look for '_____' expression and extend `font-lock-beg' and `font-lock-end'."
  ;; (message "%d:%d, %d lines" font-lock-beg font-lock-end (count-lines font-lock-beg font-lock-end))
  (cond
   ((and
     (< (count-lines font-lock-beg font-lock-end) 5)
     (not (and (<= (point-max) font-lock-end) (<= font-lock-beg (point-min)) )))
    (save-excursion
      (goto-char font-lock-beg)
      (forward-line -2)
      (setq font-lock-beg (point))
      (goto-char font-lock-end)
      (forward-line 3)
      (setq font-lock-end (point))
      )
    t)
   (t nil)
   ))

(defun dict-c5-new-entry ()
  "Insert new entry template."
  (interactive)
  (if (re-search-forward "^_____" nil t)
      (beginning-of-line)
    (goto-char (point-max)))
  (while (eq (char-before) ?\n)
    (delete-backward-char 1))
  (insert-char ?\n)
  (insert-char ?_ 5)
  (insert-char ?\n 3)
  (backward-char))

(defvar dict-c5-mode-map (make-sparse-keymap))
(define-key dict-c5-mode-map [C-return] 'dict-c5-new-entry)

;;;###autoload
(define-derived-mode dict-c5-mode fundamental-mode "Dict-c5"
  "Derived mode for editing C5 dictd source file."
  (add-to-list 'auto-mode-alist (cons "\\.dict-c5$" 'dict-c5-mode))
  (setq font-lock-defaults
        '(dict-c5-font-lock-keywords
          t nil nil nil
          (font-lock-multiline . t)
          ))
  (use-local-map dict-c5-mode-map)
  (modify-syntax-entry ?' ".")
  (modify-syntax-entry ?\" ".")
  (make-local-variable 'paragraph-separate)
  (setq paragraph-separate "\\([ \t\f]*\\|_\\{5,\\}\\)$")
  (make-local-variable 'paragraph-start)
  (setq paragraph-start paragraph-separate)
  (add-hook 'font-lock-extend-region-functions 'dict-c5-font-lock-extend-region t)
  )

;;; dict-mode.el ends here