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;;; ledger-navigate.el --- Provide navigation services through the ledger buffer.
;; Copyright (C) 2014-2015 Craig 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:
;;
(provide 'ledger-navigate)
(defun ledger-navigate-next-xact ()
"Move point to beginning of next xact."
;; make sure we actually move to the next xact, even if we are the
;; beginning of one now.
(if (looking-at ledger-payee-any-status-regex)
(forward-line))
(if (re-search-forward ledger-payee-any-status-regex nil t)
(goto-char (match-beginning 0))
(goto-char (point-max))))
(defun ledger-navigate-start-xact-or-directive-p ()
"return t if at the beginning of an empty line or line
beginning with whitespace"
(not (looking-at "[ \t]\\|\\(^$\\)")))
(defun ledger-navigate-next-xact-or-directive ()
"move to the beginning of the next xact or directive"
(interactive)
(beginning-of-line)
(if (ledger-navigate-start-xact-or-directive-p) ; if we are the start of an xact, move forward to the next xact
(progn
(forward-line)
(if (not (ledger-navigate-start-xact-or-directive-p)) ; we have moved forward and are not at another xact, recurse forward
(ledger-navigate-next-xact-or-directive)))
(while (not (or (eobp) ; we didn't start off at the beginning of an xact
(ledger-navigate-start-xact-or-directive-p)))
(forward-line))))
(defun ledger-navigate-prev-xact ()
"Move point to beginning of previous xact."
(ledger-navigate-beginning-of-xact)
(re-search-backward ledger-xact-start-regex nil t))
(defun ledger-navigate-beginning-of-xact ()
"Move point to the beginning of the current xact"
(interactive)
;; need to start at the beginning of a line incase we are in the first line of an xact already.
(beginning-of-line)
(unless (looking-at ledger-xact-start-regex)
(re-search-backward ledger-xact-start-regex nil t)
(beginning-of-line))
(point))
(defun ledger-navigate-end-of-xact ()
"Move point to end of xact."
(interactive)
(ledger-navigate-next-xact-or-directive)
(backward-char)
(end-of-line)
(point))
(defun ledger-navigate-to-line (line-number)
"Rapidly move point to line LINE-NUMBER."
(goto-char (point-min))
(forward-line (1- line-number)))
(defun ledger-navigate-find-xact-extents (pos)
"Return list containing point for beginning and end of xact containing POS.
Requires empty line separating xacts."
(interactive "d")
(save-excursion
(goto-char pos)
(list (ledger-navigate-beginning-of-xact)
(ledger-navigate-end-of-xact))))
;;; ledger-navigate.el ends here
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