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+;;; ledger-sort.el --- Helper code for use with the "ledger" command-line tool  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2003-2016 John Wiegley (johnw AT gnu DOT org)
+
+;; 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-navigate)
+
+(defun ledger-sort-find-start ()
+  "Find the beginning of a sort region."
+  (when (re-search-forward ";.*Ledger-mode:.*Start sort" nil t)
+    (match-end 0)))
+
+(defun ledger-sort-find-end ()
+  "Find the end of a sort region."
+  (when (re-search-forward ";.*Ledger-mode:.*End sort" nil t)
+    (match-end 0)))
+
+(defun ledger-sort-insert-start-mark ()
+  "Insert a marker to start a sort region."
+  (interactive)
+  (save-excursion
+    (goto-char (point-min))
+    (when (ledger-sort-find-start)
+      (delete-region (match-beginning 0) (match-end 0))))
+  (beginning-of-line)
+  (insert "\n; Ledger-mode: Start sort\n\n"))
+
+(defun ledger-sort-insert-end-mark ()
+  "Insert a marker to end a sort region."
+  (interactive)
+  (save-excursion
+    (goto-char (point-min))
+    (when (ledger-sort-find-end)
+      (delete-region (match-beginning 0) (match-end 0))))
+  (beginning-of-line)
+  (insert "\n; Ledger-mode: End sort\n\n"))
+
+(defun ledger-sort-startkey ()
+  "Return the actual date so the sort subroutine doesn't sort on the entire first line."
+  (buffer-substring-no-properties (point) (+ 10 (point))))
+
+(defun ledger-sort-region (beg end)
+  "Sort the region from BEG to END in chronological order."
+  (interactive "r") ;; load beg and end from point and mark
+  ;; automagically
+  (let* ((new-beg beg)
+         (new-end end)
+         (bounds (ledger-navigate-find-xact-extents (point)))
+         (point-delta (- (point) (car bounds)))
+         (target-xact (buffer-substring (car bounds) (cadr bounds)))
+         (inhibit-modification-hooks t))
+    (save-excursion
+      (save-restriction
+        (goto-char beg)
+        ;; make sure beg of region is at the beginning of a line
+        (beginning-of-line)
+        ;; make sure point is at the beginning of a xact
+        (unless (looking-at ledger-payee-any-status-regex)
+          (ledger-navigate-next-xact))
+        (setq new-beg (point))
+        (goto-char end)
+        (ledger-navigate-next-xact)
+        ;; make sure end of region is at the beginning of next record
+        ;; after the region
+        (setq new-end (point))
+        (narrow-to-region new-beg new-end)
+        (goto-char new-beg)
+
+        (let ((inhibit-field-text-motion t))
+          (sort-subr
+           nil
+           'ledger-navigate-next-xact
+           'ledger-navigate-end-of-xact
+           'ledger-sort-startkey))))
+
+    (goto-char (point-min))
+    (re-search-forward (regexp-quote target-xact))
+    (goto-char (+ (match-beginning 0) point-delta))))
+
+(defun ledger-sort-buffer ()
+  "Sort the entire buffer."
+  (interactive)
+  (let (sort-start
+        sort-end)
+    (save-excursion
+      (goto-char (point-min))
+      (setq sort-start (ledger-sort-find-start)
+            sort-end (ledger-sort-find-end)))
+    (ledger-sort-region (or sort-start (point-min))
+                        (or sort-end (point-max)))))
+
+(provide 'ledger-sort)
+
+;;; ledger-sort.el ends here