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;;; ldg-commodities.el --- Helper code for use with the "ledger" command-line tool
;; Copyright (C) 2003-2013 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., 59 Temple Place - Suite 330, Boston,
;; MA 02111-1307, USA.
;;; Commentary:
;; Helper functions to deal with commoditized numbers. A commoditized
;; number will be a list of value and string where the string contains
;; the commodity
;;; Code:
(require 'ldg-regex)
(defcustom ledger-reconcile-default-commodity "$"
"The default commodity for use in target calculations in ledger reconcile."
:type 'string
:group 'ledger-reconcile)
(defun ledger-split-commodity-string (str)
"Split a commoditized string, STR, into two parts.
Returns a list with (value commodity)."
(if (> (length str) 0)
(let ((number-regex (if (assoc "decimal-comma" ledger-environment-alist)
ledger-amount-decimal-comma-regex
ledger-amount-decimal-period-regex)))
(with-temp-buffer
(insert str)
(goto-char (point-min))
(cond
((re-search-forward "\"\\(.*\\)\"" nil t) ; look for quoted commodities
(let ((com (delete-and-extract-region
(match-beginning 1)
(match-end 1))))
(if (re-search-forward number-regex nil t)
(list
(string-to-number
(ledger-commodity-string-number-decimalize
(delete-and-extract-region (match-beginning 0) (match-end 0)) :from-user))
com))))
((re-search-forward number-regex nil t)
;; found a number in the current locale, return it in
;; the car. Anything left over is annotation,
;; the first thing should be the commodity, separated
;; by whitespace, return it in the cdr. I can't think of any
;; counterexamples
(list
(string-to-number
(ledger-commodity-string-number-decimalize
(delete-and-extract-region (match-beginning 0) (match-end 0)) :from-user))
(nth 0 (split-string (buffer-substring-no-properties (point-min) (point-max))))))
((re-search-forward "0" nil t)
;; couldn't find a decimal number, look for a single 0,
;; indicating account with zero balance
(list 0 ledger-reconcile-default-commodity)))))
;; nothing found, return 0
(list 0 ledger-reconcile-default-commodity)))
(defun ledger-string-balance-to-commoditized-amount (str)
"Return a commoditized amount (val, 'comm') from STR."
(let ((fields (split-string str "[\n\r]"))) ; break any balances
; with multi commodities
; into a list
(mapcar #'(lambda (str)
(ledger-split-commodity-string str))
fields)))
(defun -commodity (c1 c2)
"Subtract C2 from C1, ensuring their commodities match."
(if (string= (cadr c1) (cadr c2))
(list (- (car c1) (car c2)) (cadr c1))
(error "Can't subtract different commodities %S from %S" c2 c1)))
(defun +commodity (c1 c2)
"Add C1 and C2, ensuring their commodities match."
(if (string= (cadr c1) (cadr c2))
(list (+ (car c1) (car c2)) (cadr c1))
(error "Can't add different commodities, %S to %S" c1 c2)))
(defun ledger-commodity-string-number-decimalize (number-string direction)
"Take NUMBER-STRING and ensure proper decimalization for use by string-to-number and number-to-string.
DIRECTION can be :to-user or :from-user. All math calculations
are done with decimal-period, some users may prefer decimal-comma
which must be translated both directions."
(let ((val number-string))
(if (assoc "decimal-comma" ledger-environment-alist)
(cond ((eq direction :from-user)
;; change string to decimal-period
(while (string-match "," val)
(setq val (replace-match "." nil nil val)))) ;; switch to period separator
((eq direction :to-user)
;; change to decimal-comma
(while (string-match "\\." val)
(setq val (replace-match "," nil nil val)))) ;; gets rid of periods
(t
(error "ledger-commodity-string-number-decimalize: direction not properly specified %S" direction)))
(while (string-match "," val)
(setq val (replace-match "" nil nil val))))
val))
(defun ledger-commodity-to-string (c1)
"Return string representing C1.
Single character commodities are placed ahead of the value,
longer ones are after the value."
(let ((val (ledger-commodity-string-number-decimalize
(number-to-string (car c1)) :to-user))
(commodity (cadr c1)))
(if (> (length commodity) 1)
(concat val " " commodity)
(concat commodity " " val))))
(defun ledger-read-commodity-string (prompt)
(let ((str (read-from-minibuffer
(concat prompt " (" ledger-reconcile-default-commodity "): ")))
comm)
(if (> (length str) 0)
(progn
(setq comm (ledger-split-commodity-string str))
(if (cadr comm)
comm
(list (car comm) ledger-reconcile-default-commodity))))))
(provide 'ldg-commodities)
;;; ldg-commodities.el ends here
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