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;;; ledger-fontify.el --- Provide custom fontification for ledger-mode
;; 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
(provide 'ledger-fontify)
(defcustom ledger-fontify-xact-state-overrides nil
"If t the overall xact state (cleard, pending, nil) will
control the font of the entire transaction, not just the payee
line."
:type 'boolean
:group 'ledger)
(defun ledger-fontify-buffer-part (&optional beg end len)
(save-excursion
(unless beg (setq beg (point-min)))
(unless end (setq end (point-max)))
(beginning-of-line)
(while (< (point) end)
(cond ((or (looking-at ledger-xact-start-regex)
(looking-at ledger-posting-regex))
(ledger-fontify-xact-at (point)))
((looking-at ledger-directive-start-regex)
(ledger-fontify-directive-at (point))))
(ledger-navigate-next-xact-or-directive))))
(defun ledger-fontify-xact-at (position)
(interactive "d")
(save-excursion
(goto-char position)
(let ((extents (ledger-navigate-find-element-extents position))
(state (ledger-transaction-state)))
(if (and ledger-fontify-xact-state-overrides state)
(cond ((eq state 'cleared)
(ledger-fontify-set-face extents 'ledger-font-xact-cleared-face))
((eq state 'pending)
(ledger-fontify-set-face extents 'ledger-font-xact-pending-face)))
(ledger-fontify-xact-by-line extents)))))
(defun ledger-fontify-xact-by-line (extents)
"do line-by-line detailed fontification of xact"
(interactive)
(save-excursion
(ledger-fontify-xact-start (car extents))
(while (< (point) (cadr extents))
(if (looking-at "[ \t]+;")
(ledger-fontify-set-face (list (point) (progn
(end-of-line)
(point))) 'ledger-font-comment-face)
(ledger-fontify-posting (point)))
(forward-line))))
(defun ledger-fontify-xact-start (pos)
"POS should be at the beginning of a line starting an xact.
Fontify the first line of an xact"
(goto-char pos)
(beginning-of-line)
(let ((state nil))
(re-search-forward ledger-xact-start-regex)
(ledger-fontify-set-face (list (match-beginning 1) (match-end 1)) 'ledger-font-posting-date-face)
(save-match-data (setq state (ledger-state-from-string (s-trim (match-string 5)))))
(ledger-fontify-set-face (list (match-beginning 7) (match-end 7))
(cond ((eq state 'pending)
'ledger-font-payee-pending-face)
((eq state 'cleared)
'ledger-font-payee-cleared-face)
(t
'ledger-font-payee-uncleared-face)))
(ledger-fontify-set-face (list (match-beginning 8)
(match-end 8)) 'ledger-font-comment-face)))
(defun ledger-fontify-posting (pos)
(let* ((state nil)
(end-of-line-comment nil)
(end (progn (end-of-line)
(point)))
(start (progn (beginning-of-line)
(point))))
;; Look for a posting status flag
(save-match-data ;; must use save-match-data to shadow the search
;; results. If there is no status flag then the
;; search below will fail and NOT clear the match
;; data. So if the previous line did have a
;; status flag it is still sitting in the match
;; data, causing the current line to be fontified
;; like the previous line. Don't ask how long
;; that took to figure out
(re-search-forward " \\([*!]\\) " end t)
(if (match-string 1)
(setq state (ledger-state-from-string (s-trim (match-string 1))))))
(beginning-of-line)
(re-search-forward "[[:graph:]]\\([ \t][ \t]\\)" end 'end) ;; find the end of the account, or end of line
(when (<= (point) end) ;; we are still on the line
(ledger-fontify-set-face (list start (point))
(cond ((eq state 'cleared)
'ledger-font-posting-account-cleared-face)
((eq state 'pending)
'ledger-font-posting-account-pending-face)
(t
'ledger-font-posting-account-face)))
(when (< (point) end) ;; there is still more to fontify
(setq start (point)) ;; update start of next font region
(setq end-of-line-comment (re-search-forward ";" end 'end)) ;; find the end of the line, or start of a comment
(ledger-fontify-set-face (list start (point) )
(cond ((eq state 'cleared)
'ledger-font-posting-amount-cleared-face)
((eq state 'pending)
'ledger-font-posting-amount-pending-face)
(t
'ledger-font-posting-amount-face)))
(when end-of-line-comment
(setq start (point))
(end-of-line)
(ledger-fontify-set-face (list (- start 1) (point)) ;; subtract 1 from start because we passed the semi-colon
'ledger-font-comment-face))))))
(defun ledger-fontify-directive-at (position)
(let ((extents (ledger-navigate-find-element-extents position))
(face 'ledger-font-default-face))
(cond ((looking-at "=")
(setq face 'ledger-font-auto-xact-face))
((looking-at "~")
(setq face 'ledger-font-periodic-xact-face))
((looking-at "[;#%|\\*]")
(setq face 'ledger-font-comment-face))
((looking-at "\\(year\\)\\|Y")
(setq face 'ledger-font-year-directive-face))
((looking-at "account")
(setq face 'ledger-font-account-directive-face))
((looking-at "apply")
(setq face 'ledger-font-apply-directive-face))
((looking-at "alias")
(setq face 'ledger-font-alias-directive-face))
((looking-at "assert")
(setq face 'ledger-font-assert-directive-face))
((looking-at "\\(bucket\\)\\|A")
(setq face 'ledger-font-bucket-directive-face))
((looking-at "capture")
(setq face 'ledger-font-capture-directive-face))
((looking-at "check")
(setq face 'ledger-font-check-directive-face))
((looking-at "commodity")
(setq face 'ledger-font-commodity-directive-face))
((looking-at "define")
(setq face 'ledger-font-define-directive-face))
((looking-at "end")
(setq face 'ledger-font-end-directive-face))
((looking-at "expr")
(setq face 'ledger-font-expr-directive-face))
((looking-at "fixed")
(setq face 'ledger-font-fixed-directive-face))
((looking-at "include")
(setq face 'ledger-font-include-directive-face))
((looking-at "payee")
(setq face 'ledger-font-payee-directive-face))
((looking-at "P")
(setq face 'ledger-font-price-directive-face))
((looking-at "tag")
(setq face 'ledger-font-tag-directive-face)))
(ledger-fontify-set-face extents face)))
(defun ledger-fontify-set-face (extents face)
(put-text-property (car extents) (cadr extents) 'face face))
(defun s-trim-left (s)
"Remove whitespace at the beginning of S."
(if (string-match "\\`[ \t\n\r]+" s)
(replace-match "" t t s)
s))
(defun s-trim-right (s)
"Remove whitespace at the end of S."
(if (string-match "[ \t\n\r]+\\'" s)
(replace-match "" t t s)
s))
(defun s-trim (s)
"Remove whitespace at the beginning and end of S."
(s-trim-left (s-trim-right s)))
;;; ledger-fontify.el ends here
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