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+;;; ledger.el --- Helper code for using my "ledger" command-line tool
+
+;; Copyright (C) 2004 John Wiegley (johnw AT gnu DOT org)
+
+;; Emacs Lisp Archive Entry
+;; Filename: ledger.el
+;; Version: 1.1
+;; Date: Thu 02-Apr-2004
+;; Keywords: data
+;; Author: John Wiegley (johnw AT gnu DOT org)
+;; Maintainer: John Wiegley (johnw AT gnu DOT org)
+;; Description: Helper code for using my "ledger" command-line tool
+;; URL: http://www.newartisans.com/johnw/emacs.html
+;; Compatibility: Emacs21
+
+;; 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., 59 Temple Place - Suite 330, Boston,
+;; MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This code is only meaningful if you are using "ledger".
+
+(defvar ledger-version "1.1"
+  "The version of ledger.el currently loaded")
+
+(defgroup ledger nil
+  "Interface to the Ledger command-line accounting program."
+  :group 'data)
+
+(defcustom ledger-binary-path (executable-find "ledger")
+  "Path to the ledger executable."
+  :type 'file
+  :group 'ledger)
+
+(defcustom ledger-data-file (getenv "LEDGER")
+  "Path to the ledger data file."
+  :type 'file
+  :group 'ledger)
+
+(defvar bold 'bold)
+
+(defvar ledger-font-lock-keywords
+  '(("^[0-9./]+\\s-+\\(?:([^)]+)\\s-+\\)?\\([^*].+\\)" 1 bold)
+    ("^\\s-+.+?\\(  \\|\t\\|\\s-+$\\)" . font-lock-keyword-face))
+  "Default expressions to highlight in Ledger mode.")
+
+(defun ledger-iterate-entries (callback)
+  (goto-char (point-min))
+  (let* ((now (current-time))
+	 (current-year (nth 5 (decode-time now))))
+    (while (not (eobp))
+      (when (looking-at
+	     (concat "\\(Y\\s-+\\([0-9]+\\)\\|"
+		     "\\([0-9]\\{4\\}+\\)?[./]?"
+		     "\\([0-9]+\\)[./]\\([0-9]+\\)\\s-+"
+		     "\\(\\*\\s-+\\)?\\(.+\\)\\)"))
+	(let ((found (match-string 2)))
+	  (if found
+	      (setq current-year (string-to-number found))
+	    (let ((start (match-beginning 0))
+		  (year (match-string 3))
+		  (month (string-to-number (match-string 4)))
+		  (day (string-to-number (match-string 5)))
+		  (mark (match-string 6))
+		  (desc (match-string 7)))
+	      (if (and year (> (length year) 0))
+		  (setq year (string-to-number year)))
+	      (funcall callback start
+		       (encode-time 0 0 0 day month
+				    (or year current-year))
+		       mark desc)))))
+      (forward-line))))
+
+(defun ledger-find-slot (moment)
+  (catch 'found
+    (ledger-iterate-entries
+     (function
+      (lambda (start date mark desc)
+	(if (time-less-p moment date)
+	    (throw 'found t)))))))
+
+(defun ledger-add-entry (entry)
+  (interactive
+   (list (read-string "Entry: " (format-time-string "%Y/%m/%d "))))
+  (let* ((args (mapcar 'shell-quote-argument (split-string entry)))
+	 (date (car args))
+	 (insert-year t) exit-code)
+    (if (string-match "\\([0-9]+\\)/\\([0-9]+\\)/\\([0-9]+\\)" date)
+	(setq date (encode-time 0 0 0 (string-to-int (match-string 3 date))
+				(string-to-int (match-string 2 date))
+				(string-to-int (match-string 1 date)))))
+    (ledger-find-slot date)
+    (save-excursion
+      (if (re-search-backward "^Y " nil t)
+	  (setq insert-year nil)))
+    (save-excursion
+      (insert
+       (with-temp-buffer
+	 (setq exit-code (apply 'ledger-run-ledger "entry" args))
+	 (if (= 0 exit-code)
+	     (if insert-year
+		 (buffer-string)
+	       (buffer-substring 5 (point-max)))
+	   (concat (if insert-year entry
+		     (substring entry 5)) "\n\n")))))))
+
+(defun ledger-expand-entry ()
+  (interactive)
+  (ledger-add-entry (prog1
+			(buffer-substring (line-beginning-position)
+					  (line-end-position))
+		      (delete-region (line-beginning-position)
+				     (1+ (line-end-position))))))
+
+(defun ledger-toggle-current ()
+  (interactive)
+  (let (clear)
+    (save-excursion
+      (when (or (looking-at "^[0-9]")
+		(re-search-backward "^[0-9]" nil t))
+	(skip-chars-forward "0-9./")
+	(delete-horizontal-space)
+	(if (equal ?\* (char-after))
+	    (delete-char 1)
+	  (insert " * ")
+	  (setq clear t))))
+    clear))
+
+(defun ledger-print-result (command)
+  (interactive "sLedger command: ")
+  (shell-command (format "%s -f %s %s" ledger-binary-path
+			 buffer-file-name command)))
+
+(define-derived-mode ledger-mode text-mode "Ledger"
+  "A mode for editing ledger data files."
+  (set (make-local-variable 'comment-start) ";")
+  (set (make-local-variable 'comment-end) "")
+  (set (make-local-variable 'indent-tabs-mode) nil)
+  (if (boundp 'font-lock-defaults)
+      (set (make-local-variable 'font-lock-defaults)
+	   '(ledger-font-lock-keywords nil t)))
+  (let ((map (current-local-map)))
+    (define-key map [(control ?c) (control ?a)] 'ledger-add-entry)
+    (define-key map [(control ?c) (control ?c)] 'ledger-toggle-current)
+    (define-key map [(control ?c) (control ?p)] 'ledger-print-result)
+    (define-key map [(control ?c) (control ?r)] 'ledger-reconcile)))
+
+(defun ledger-parse-entries (account &optional all-p after-date)
+  (let (total entries)
+    (ledger-iterate-entries
+     (function
+      (lambda (start date mark desc)
+	(when (and (or all-p (not mark))
+		   (time-less-p after-date date))
+	  (forward-line)
+	  (setq total 0.0)
+	  (while (looking-at
+		  (concat "\\s-+\\([A-Za-z_].+?\\)\\(\\s-*$\\|  \\s-*"
+			  "\\([^0-9]+\\)\\s-*\\([0-9,.]+\\)\\)?"
+			  "\\(\\s-+;.+\\)?$"))
+	    (let ((acct (match-string 1))
+		  (amt (match-string 4)))
+	      (when amt
+		(while (string-match "," amt)
+		  (setq amt (replace-match "" nil nil amt)))
+		(setq amt (string-to-number amt)
+		      total (+ total amt)))
+	      (if (string= account acct)
+		  (setq entries
+			(cons (list (copy-marker start)
+				    mark date desc (or amt total))
+			      entries))))
+	    (forward-line))))))
+    entries))
+
+(defvar ledger-reconcile-text "Reconcile")
+
+(define-derived-mode ledger-reconcile-mode text-mode 'ledger-reconcile-text
+  "A mode for reconciling ledger entries."
+  (let ((map (make-sparse-keymap)))
+    (define-key map [? ] 'ledger-reconcile-toggle)
+    (define-key map [?q]
+      (function
+       (lambda ()
+	 (interactive)
+	 (kill-buffer (current-buffer)))))
+    (use-local-map map)))
+
+(add-to-list 'minor-mode-alist
+	     '(ledger-reconcile-mode ledger-reconcile-text))
+
+(defvar ledger-buf nil)
+(defvar ledger-acct nil)
+
+(defun ledger-update-balance-display ()
+  (let ((account ledger-acct))
+    (with-temp-buffer
+      (let ((exit-code (ledger-run-ledger "-C" "balance" account)))
+	(if (/= 0 exit-code)
+	    (setq ledger-reconcile-text "Reconcile [ERR]")
+	  (goto-char (point-min))
+	  (delete-horizontal-space)
+	  (skip-syntax-forward "^ ")
+	  (setq ledger-reconcile-text
+		(concat "Reconcile ["
+			(buffer-substring-no-properties (point-min) (point))
+			"]"))))))
+  (force-mode-line-update))
+
+(defun ledger-reconcile-toggle ()
+  (interactive)
+  (let ((where (get-text-property (point) 'where))
+	(account ledger-acct)
+	cleared)
+    (with-current-buffer ledger-buf
+      (goto-char where)
+      (setq cleared (ledger-toggle-current))
+      (save-buffer))
+    (if cleared
+	(add-text-properties (line-beginning-position)
+			     (line-end-position)
+			     (list 'face 'bold))
+      (remove-text-properties (line-beginning-position)
+			      (line-end-position)
+			      (list 'face)))
+    (forward-line)
+    (ledger-update-balance-display)))
+
+(defun ledger-reconcile (account &optional days)
+  (interactive "sAccount to reconcile: \nnBack how far (default 30 days): ")
+  (let* ((then (time-subtract (current-time)
+			      (seconds-to-time (* (or days 30) 24 60 60))))
+	 (items (save-excursion
+		  (goto-char (point-min))
+		  (ledger-parse-entries account t then)))
+	 (buf (current-buffer)))
+    (with-current-buffer
+	(pop-to-buffer (generate-new-buffer "*Reconcile*"))
+      (ledger-reconcile-mode)
+      (set (make-local-variable 'ledger-buf) buf)
+      (set (make-local-variable 'ledger-acct) account)
+      (ledger-update-balance-display)
+      (dolist (item items)
+	(let ((beg (point)))
+	  (insert (format "%s %-30s %8.2f\n"
+			  (format-time-string "%Y/%m/%d" (nth 2 item))
+			  (nth 3 item) (nth 4 item)))
+	  (if (nth 1 item)
+	      (set-text-properties beg (1- (point))
+				   (list 'face 'bold
+					 'where (nth 0 item)))
+	    (set-text-properties beg (1- (point))
+				 (list 'where (nth 0 item)))))
+	(goto-char (point-min))))))
+
+(defun ledger-align-dollars (&optional column)
+  (interactive "p")
+  (if (= column 1)
+      (setq column 48))
+  (while (search-forward "$" nil t)
+    (backward-char)
+    (let ((col (current-column))
+	  (beg (point))
+	  target-col len)
+      (skip-chars-forward "-$0-9,.")
+      (setq len (- (point) beg))
+      (setq target-col (- column len))
+      (if (< col target-col)
+	  (progn
+	    (goto-char beg)
+	    (insert (make-string (- target-col col) ? )))
+	(move-to-column target-col)
+	(if (looking-back "  ")
+	    (delete-char (- col target-col))
+	  (skip-chars-forward "^ \t")
+	  (delete-horizontal-space)
+	  (insert "  ")))
+      (forward-line))))
+
+(defun ledger-run-ledger (&rest args)
+  "run ledger with supplied arguments"
+  (apply 'call-process ledger-binary-path nil t nil
+	 (append (list "-f" ledger-data-file) args)))
+
+(provide 'ledger)
+
+;;; ledger.el ends here