1 files changed, 168 insertions, 0 deletions
diff --git a/lisp/ledger-navigate.el b/lisp/ledger-navigate.el
new file mode 100644
index 00000000..904faf8c
--- /dev/null
+++ b/lisp/ledger-navigate.el
@@ -0,0 +1,168 @@
+;;; 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:
+;;
+
+;;; Code:
+
+(require 'ledger-regex)
+(require 'ledger-context)
+
+(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 or all-whitespace line."
+	(not (looking-at "[ \t]\\|\\(^$\\)")))
+
+(defun ledger-navigate-next-xact-or-directive ()
+	"Move to the beginning of the next xact or directive."
+	(interactive)
+	(beginning-of-line)
+	(if (ledger-navigate-start-xact-or-directive-p) ; if we are the start of an xact, move forward to the next xact
+			(progn
+				(forward-line)
+				(if (not (ledger-navigate-start-xact-or-directive-p)) ; we have moved forward and are not at another xact, recurse forward
+						(ledger-navigate-next-xact-or-directive)))
+		(while (not	(or (eobp)  ; we didn't start off at the beginning of an xact
+										(ledger-navigate-start-xact-or-directive-p)))
+			(forward-line))))
+
+(defun ledger-navigate-prev-xact-or-directive ()
+  "Move point to beginning of previous xact."
+	(interactive)
+	(let ((context (car (ledger-context-at-point))))
+		(when (equal context 'acct-transaction)
+			(ledger-navigate-beginning-of-xact))
+		(beginning-of-line)
+		(re-search-backward "^[[:graph:]]" nil t)))
+
+(defun ledger-navigate-beginning-of-xact ()
+	"Move point to the beginning of the current xact."
+	(interactive)
+	;; need to start at the beginning of a line incase we are in the first line of an xact already.
+	(beginning-of-line)
+	(let ((sreg (concat "^\\(=\\|~\\|" ledger-iso-date-regexp "\\)")))
+		(unless (looking-at sreg)
+			(re-search-backward sreg nil t)
+			(beginning-of-line)))
+	(point))
+
+(defun ledger-navigate-end-of-xact ()
+  "Move point to end of xact."
+	(interactive)
+  (ledger-navigate-next-xact-or-directive)
+	(re-search-backward ".$")
+	(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))))
+
+(defun ledger-navigate-find-directive-extents (pos)
+  "Return the extents of the directive at POS."
+	(goto-char pos)
+	(let ((begin (progn (beginning-of-line)
+											(point)))
+				(end (progn (end-of-line)
+										(+ 1 (point)))))
+		;; handle block comments here
+		(beginning-of-line)
+		(if (looking-at " *;")
+				(progn
+					(while (and (looking-at " *;")
+											(> (point) (point-min)))
+						(forward-line -1))
+					;; We are either at the beginning of the buffer, or we found
+					;; a line outside the comment.  If we are not at the
+					;; beginning of the buffer then we need to move forward a
+					;; line.
+					(if (> (point) (point-min))
+							(progn (forward-line 1)
+										 (beginning-of-line)))
+					(setq begin (point))
+					(goto-char pos)
+					(beginning-of-line)
+					(while (and (looking-at " *;")
+											(< (point) (point-max)))
+						(forward-line 1))
+					(setq end (point))))
+		(list begin end)))
+
+(defun ledger-navigate-block-comment (pos)
+  "Move past the block comment at POS, and return its extents."
+	(interactive "d")
+	(goto-char pos)
+	(let ((begin (progn (beginning-of-line)
+											(point)))
+				(end (progn (end-of-line)
+										(point))))
+		;; handle block comments here
+		(beginning-of-line)
+		(if (looking-at " *;")
+				(progn
+					(while (and (looking-at " *;")
+											(> (point) (point-min)))
+						(forward-line -1))
+					(setq begin (point))
+					(goto-char pos)
+					(beginning-of-line)
+					(while (and (looking-at " *;")
+											(< (point) (point-max)))
+						(forward-line 1))
+					(setq end (point))))
+		(list begin end)))
+
+
+(defun ledger-navigate-find-element-extents (pos)
+  "Return list containing beginning and end of the entity surrounding POS."
+  (interactive "d")
+  (save-excursion
+    (goto-char pos)
+    (beginning-of-line)
+    (if (looking-at "[ =~0-9]")
+        (ledger-navigate-find-xact-extents pos)
+      (ledger-navigate-find-directive-extents pos))))
+
+
+(provide 'ledger-navigate)
+
+;;; ledger-navigate.el ends here