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-;;; ledger-commodities.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:
-;; 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 'ledger-regex)
-
-;; These keep the byte-compiler from warning about them, but have no other
-;; effect:
-(defvar ledger-environment-alist)
-(declare-function ledger-exec-ledger "ledger-exec" (input-buffer &optional output-buffer &rest args))
-
-(defcustom ledger-reconcile-default-commodity "$"
- "The default commodity for use in target calculations in ledger reconcile."
- :type 'string
- :group 'ledger-reconcile)
-
-(defun ledger-read-commodity-with-prompt (prompt)
- "Read commodity name after PROMPT.
-
-Default value is `ledger-reconcile-default-commodity'."
- (let* ((buffer (current-buffer))
- (commodities (with-temp-buffer
- (ledger-exec-ledger buffer (current-buffer) "commodities")
- (split-string (buffer-string) "\n" t))))
- (completing-read prompt commodities nil t nil nil ledger-reconcile-default-commodity)))
-
-(defun ledger-split-commodity-string (str)
- "Split a commoditized string, STR, into two parts.
-Returns a list with (value commodity)."
- (let ((number-regex (if (assoc "decimal-comma" ledger-environment-alist)
- ledger-amount-decimal-comma-regex
- ledger-amount-decimal-period-regex)))
- (if (> (length str) 0)
- (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
- (ledger-string-to-number
- (delete-and-extract-region (match-beginning 0) (match-end 0)))
- 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
- (ledger-string-to-number
- (delete-and-extract-region (match-beginning 0) (match-end 0)))
- (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
- (t (list 0 ledger-reconcile-default-commodity)))))))
-
-(defun ledger-string-balance-to-commoditized-amount (str)
- "Return a commoditized amount (val, 'comm') from STR."
- ; break any balances with multi commodities into a list
- (mapcar #'(lambda (st)
- (ledger-split-commodity-string st))
- (split-string str "[\n\r]")))
-
-(defun ledger-subtract-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 ledger-add-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-strip (str char)
- "Return STR with CHAR removed."
- (replace-regexp-in-string char "" str))
-
-(defun ledger-string-to-number (str &optional decimal-comma)
- "Parse STR as a number and return that number.
-
-Improves builtin `string-to-number' by handling
-internationalization, and return nil if number can't be parsed.
-See `ledger-environment-alist' for DECIMAL-COMMA."
- (let ((nstr (if (or decimal-comma
- (assoc "decimal-comma" ledger-environment-alist))
- (ledger-strip str "[.]")
- (ledger-strip str ","))))
- (while (string-match "," nstr) ;if there is a comma now, it is a thousands separator
- (setq nstr (replace-match "." nil nil nstr)))
- (string-to-number nstr)))
-
-(defun ledger-number-to-string (n &optional decimal-comma)
- "See `number-to-string' for N.
-DECIMAL-COMMA is as documented in `ledger-environment-alist'."
- (let ((str (number-to-string n)))
- (when (or decimal-comma
- (assoc "decimal-comma" ledger-environment-alist))
- (while (string-match "\\." str)
- (setq str (replace-match "," nil nil str))))
- str))
-
-(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 ((str (ledger-number-to-string (car c1)))
- (commodity (cadr c1)))
- (if (> (length commodity) 1)
- (concat str " " commodity)
- (concat commodity " " str))))
-
-(defun ledger-read-commodity-string (prompt)
- "Read an amount from mini-buffer using PROMPT."
- (let ((str (read-from-minibuffer
- (concat prompt " (" ledger-reconcile-default-commodity "): ")))
- comm)
- (if (and (> (length str) 0)
- (ledger-split-commodity-string str))
- (progn
- (setq comm (ledger-split-commodity-string str))
- (if (cadr comm)
- comm
- (list (car comm) ledger-reconcile-default-commodity))))))
-
-(provide 'ledger-commodities)
-
-;;; ledger-commodities.el ends here
Copyright 2019--2024 Marius PETER