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;;; ledger-exec.el --- Helper code for use with the "ledger" command-line tool
;; Copyright (C) 2003-2015 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:
;; 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-mode-should-check-version t
"Should Ledger-mode verify that the executable is working?"
:type 'boolean
:group 'ledger-exec)
(defcustom ledger-binary-path "ledger"
"Path to the ledger executable."
:type 'file
:group 'ledger-exec)
(defun ledger-exec-handle-error (ledger-output)
"Deal with ledger errors contained in LEDGER-OUTPUT."
(with-current-buffer (get-buffer-create "*Ledger Error*")
(insert-buffer-substring ledger-output)
(view-mode)
(setq buffer-read-only t)))
(defun ledger-exec-success-p (ledger-output-buffer)
"Return t if the ledger output in LEDGER-OUTPUT-BUFFER is successful."
(with-current-buffer ledger-output-buffer
(goto-char (point-min))
(if (and (> (buffer-size) 1) (looking-at (regexp-quote "While")))
nil ;; failure, there is an error starting with "While"
ledger-output-buffer)))
(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)))
(if (ledger-exec-success-p outbuf)
outbuf
(ledger-exec-handle-error outbuf))))))
(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 '()))
(with-temp-buffer
(when (ledger-exec-ledger (current-buffer) (current-buffer) "--version")
(goto-char (point-min))
(delete-horizontal-space)
(setq version-strings (split-string
(buffer-substring-no-properties (point)
(point-max))))
(if (and (string-match (regexp-quote "Ledger") (car version-strings))
(or (string= needed (cadr version-strings))
(string< needed (cadr version-strings))))
t ;; success
nil))))) ;;failure
(defun ledger-check-version ()
"Verify that ledger works and is modern enough."
(interactive)
(if ledger-mode-should-check-version
(if (setq ledger-works (ledger-version-greater-p ledger-version-needed))
(message "Good Ledger Version")
(message "Bad Ledger Version"))))
(provide 'ledger-exec)
;;; ledger-exec.el ends here
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