140 lines
5.2 KiB
EmacsLisp
140 lines
5.2 KiB
EmacsLisp
;;; ldg-commodities.el --- Helper code for use with the "ledger" command-line tool
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;; Copyright (C) 2003-2013 John Wiegley (johnw AT gnu DOT org)
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;; This file is not part of GNU Emacs.
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;; This is free software; you can redistribute it and/or modify it under
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;; the terms of the GNU General Public License as published by the Free
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;; Software Foundation; either version 2, or (at your option) any later
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;; version.
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;;
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;; This is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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;; for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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;; MA 02111-1307, USA.
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;;; Commentary:
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;; Helper functions to deal with commoditized numbers. A commoditized
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;; number will be a list of value and string where the string contains
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;; the commodity
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;;; Code:
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(require 'ldg-regex)
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(defcustom ledger-reconcile-default-commodity "$"
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"The default commodity for use in target calculations in ledger reconcile."
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:type 'string
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:group 'ledger-reconcile)
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(defun ledger-split-commodity-string (str)
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"Split a commoditized string, STR, into two parts.
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Returns a list with (value commodity)."
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(let ((number-regex (if (assoc "decimal-comma" ledger-environment-alist)
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ledger-amount-decimal-comma-regex
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ledger-amount-decimal-period-regex)))
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(if (> (length str) 0)
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(with-temp-buffer
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(insert str)
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(goto-char (point-min))
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(cond
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((re-search-forward "\"\\(.*\\)\"" nil t) ; look for quoted commodities
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(let ((com (delete-and-extract-region
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(match-beginning 1)
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(match-end 1))))
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(if (re-search-forward
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number-regex nil t)
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(list
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(ledger-string-to-number
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(delete-and-extract-region (match-beginning 0) (match-end 0)))
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com))))
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((re-search-forward number-regex nil t)
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;; found a number in the current locale, return it in the
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;; car. Anything left over is annotation, the first
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;; thing should be the commodity, separated by
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;; whitespace, return it in the cdr. I can't think of
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;; any counterexamples
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(list
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(ledger-string-to-number
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(delete-and-extract-region (match-beginning 0) (match-end 0)))
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(nth 0 (split-string (buffer-substring-no-properties (point-min) (point-max))))))
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((re-search-forward "0" nil t)
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;; couldn't find a decimal number, look for a single 0,
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;; indicating account with zero balance
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(list 0 ledger-reconcile-default-commodity))))
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;; nothing found, return 0
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(list 0 ledger-reconcile-default-commodity))))
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(defun ledger-string-balance-to-commoditized-amount (str)
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"Return a commoditized amount (val, 'comm') from STR."
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; break any balances with multi commodities into a list
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(mapcar #'(lambda (st)
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(ledger-split-commodity-string st))
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(split-string str "[\n\r]")))
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(defun -commodity (c1 c2)
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"Subtract C2 from C1, ensuring their commodities match."
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(if (string= (cadr c1) (cadr c2))
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(list (- (car c1) (car c2)) (cadr c1))
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(error "Can't subtract different commodities %S from %S" c2 c1)))
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(defun +commodity (c1 c2)
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"Add C1 and C2, ensuring their commodities match."
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(if (string= (cadr c1) (cadr c2))
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(list (+ (car c1) (car c2)) (cadr c1))
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(error "Can't add different commodities, %S to %S" c1 c2)))
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(defun ledger-strip (str char)
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(let (new-str)
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(concat (dolist (ch (append str nil) new-str)
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(unless (= ch char)
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(setq new-str (append new-str (list ch))))))))
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(defun ledger-string-to-number (str &optional decimal-comma)
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"improve builtin string-to-number by handling internationalization, and return nil of number can't be parsed"
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(let ((nstr (if (or decimal-comma
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(assoc "decimal-comma" ledger-environment-alist))
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(ledger-strip str ?.)
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(ledger-strip str ?,))))
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(while (string-match "," nstr) ;if there is a comma now, it is a thousands separator
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(setq nstr (replace-match "." nil nil nstr)))
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(string-to-number nstr)))
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(defun ledger-number-to-string (n &optional decimal-comma)
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(let ((str (number-to-string n)))
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(if (or decimal-comma
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(assoc "decimal-comma" ledger-environment-alist))
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(while (string-match "\\." str)
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(setq str (replace-match "," nil nil str)))
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str)))
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(defun ledger-commodity-to-string (c1)
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"Return string representing C1.
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Single character commodities are placed ahead of the value,
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longer ones are after the value."
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(let ((str (ledger-number-to-string (car c1)))
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(commodity (cadr c1)))
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(if (> (length commodity) 1)
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(concat str " " commodity)
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(concat commodity " " str))))
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(defun ledger-read-commodity-string (prompt)
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(let ((str (read-from-minibuffer
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(concat prompt " (" ledger-reconcile-default-commodity "): ")))
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comm)
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(if (> (length str) 0)
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(progn
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(setq comm (ledger-split-commodity-string str))
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(if (cadr comm)
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comm
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(list (car comm) ledger-reconcile-default-commodity))))))
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(provide 'ldg-commodities)
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;;; ldg-commodities.el ends here
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