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;;; ldg-exec.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:
;; Code for executing ledger synchronously.
;;; Code:
(defconst ledger-version-needed "3.0.0"
"The version of ledger executable needed for interactive features.")
(defvar ledger-works nil
"Flag showing whether the ledger binary can support `ledger-mode' interactive features.")
(defgroup ledger-exec nil
"Interface to the Ledger command-line accounting program."
:group 'ledger)
(defcustom ledger-binary-path "ledger"
"Path to the ledger executable."
:type 'file
:group 'ledger)
(defun ledger-exec-ledger (input-buffer &optional output-buffer &rest args)
"Run Ledger using INPUT-BUFFER and optionally capturing output in OUTPUT-BUFFER with ARGS."
(if (null ledger-binary-path)
(error "The variable `ledger-binary-path' has not been set"))
(let ((buf (or input-buffer (current-buffer)))
(outbuf (or output-buffer
(generate-new-buffer " *ledger-tmp*"))))
(with-current-buffer buf
(let ((coding-system-for-write 'utf-8)
(coding-system-for-read 'utf-8))
(apply #'call-process-region
(append (list (point-min) (point-max)
ledger-binary-path nil outbuf nil "-f" "-")
args)))
outbuf)))
(defun ledger-exec-read (&optional input-buffer &rest args)
"Run ledger from option INPUT-BUFFER using ARGS, return a list structure of the ledger Emacs output."
(with-current-buffer
(apply #'ledger-exec-ledger input-buffer nil "emacs" args)
(goto-char (point-min))
(prog1
(read (current-buffer))
(kill-buffer (current-buffer)))))
(defun ledger-version-greater-p (needed)
"Verify the ledger binary is usable for `ledger-mode' (version greater than NEEDED)."
(let ((buffer ledger-buf)
(version-strings '())
(version-number))
(with-temp-buffer
(ledger-exec-ledger buffer (current-buffer) "--version")
(goto-char (point-min))
(delete-horizontal-space)
(setq version-strings (split-string
(buffer-substring-no-properties (point)
(+ (point) 12))))
(if (and (string-match (regexp-quote "Ledger") (car version-strings))
(or (string= needed (car (cdr version-strings)))
(string< needed (car (cdr version-strings)))))
t
nil))))
(defun ledger-check-version ()
"Verify that ledger works and is modern enough."
(interactive)
(setq ledger-works (ledger-version-greater-p ledger-version-needed))
(if ledger-works
(message "Good Ledger Version")
(message "Bad Ledger Version")))
(provide 'ldg-exec)
;;; ldg-exec.el ends here
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