;;; ledger-fontify.el --- Provide custom fontification for ledger-mode  -*- lexical-binding: t; -*-


;; Copyright (C) 2014 Craig P. Earls (enderw88 at gmail dot com)

;; This file is not part of GNU Emacs.

;; This is free software; you can redistribute it and/or modify it under
;; the terms of the GNU General Public License as published by the Free
;; Software Foundation; either version 2, or (at your option) any later
;; version.
;;
;; This is distributed in the hope that it will be useful, but WITHOUT
;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
;; FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
;; for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
;; MA 02110-1301 USA.

;;; Commentary:
;;  Font-lock-mode doesn't handle multiline syntax very well.  This
;;  code provides font lock that is sensitive to overall transaction
;;  states


;;; Code:

(require 'ledger-navigate)
(require 'ledger-regex)
(require 'ledger-state)

;; These are dynamically bound, see `font-lock-extend-region-functions'.
(defvar font-lock-beg)
(defvar font-lock-end)

(defcustom ledger-fontify-xact-state-overrides nil
  "If t the highlight entire xact with state."
  :type 'boolean
  :group 'ledger)

(defun ledger-fontify-extend-region ()
  "Extend fontification region to include whole transactions or directives."
  (save-match-data
    (let* ((new-beg (min font-lock-beg (car (ledger-navigate-find-element-extents font-lock-beg))))
           (new-end (max font-lock-end (cadr (ledger-navigate-find-element-extents font-lock-end))))
           (changed (or (/= new-beg font-lock-beg)
                        (/= new-end font-lock-end))))
      (setq font-lock-beg new-beg)
      (setq font-lock-end new-end)
      changed)))


(provide 'ledger-fontify)

;;; ledger-fontify.el ends here