101 lines
3.6 KiB
EmacsLisp
101 lines
3.6 KiB
EmacsLisp
;;; ldg-exec.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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;; Code for executing ledger synchronously.
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;;; Code:
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(defconst ledger-version-needed "3.0.0"
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"The version of ledger executable needed for interactive features.")
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(defvar ledger-works nil
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"Flag showing whether the ledger binary can support `ledger-mode' interactive features.")
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(defgroup ledger-exec nil
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"Interface to the Ledger command-line accounting program."
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:group 'ledger)
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(defcustom ledger-binary-path "ledger"
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"Path to the ledger executable."
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:type 'file
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:group 'ledger-exec)
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(defun ledger-exec-handle-error (ledger-output)
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"Deal with ledger errors contained in LEDGER-OUTPUT."
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(with-current-buffer (get-buffer-create "*Ledger Error*")
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(insert-buffer-substring ledger-output)
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(view-mode)
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(setq buffer-read-only t)))
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(defun ledger-exec-success-p (ledger-output-buffer)
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(with-current-buffer ledger-output-buffer
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(goto-char (point-min))
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(if (and (> (buffer-size) 1) (looking-at (regexp-quote "While")))
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nil ;; failure, there is an error starting with "While"
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ledger-output-buffer)))
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(defun ledger-exec-ledger (input-buffer &optional output-buffer &rest args)
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"Run Ledger using INPUT-BUFFER and optionally capturing output in OUTPUT-BUFFER with ARGS."
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(if (null ledger-binary-path)
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(error "The variable `ledger-binary-path' has not been set")
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(let ((buf (or input-buffer (current-buffer)))
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(outbuf (or output-buffer
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(generate-new-buffer " *ledger-tmp*"))))
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(with-current-buffer buf
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(let ((coding-system-for-write 'utf-8)
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(coding-system-for-read 'utf-8))
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(apply #'call-process-region
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(append (list (point-min) (point-max)
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ledger-binary-path nil outbuf nil "-f" "-")
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args)))
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(if (ledger-exec-success-p outbuf)
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outbuf
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(ledger-exec-handle-error outbuf))))))
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(defun ledger-version-greater-p (needed)
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"Verify the ledger binary is usable for `ledger-mode' (version greater than NEEDED)."
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(let ((buffer ledger-buf)
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(version-strings '()))
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(with-temp-buffer
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(when (ledger-exec-ledger (current-buffer) (current-buffer) "--version")
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(goto-char (point-min))
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(delete-horizontal-space)
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(setq version-strings (split-string
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(buffer-substring-no-properties (point)
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(point-max))))
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(if (and (string-match (regexp-quote "Ledger") (car version-strings))
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(or (string= needed (cadr version-strings))
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(string< needed (cadr version-strings))))
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t ;; success
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nil))))) ;;failure
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(defun ledger-check-version ()
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"Verify that ledger works and is modern enough."
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(interactive)
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(if (setq ledger-works (ledger-version-greater-p ledger-version-needed))
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(message "Good Ledger Version")
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(message "Bad Ledger Version")))
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(provide 'ldg-exec)
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;;; ldg-exec.el ends here
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