lisp/ob-ledger.el

   1 ;;; ob-ledger.el --- org-babel functions for ledger evaluation
   2
   3 ;; Copyright (C) 2010-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric S Fraga
   6 ;; Keywords: literate programming, reproducible research, accounting
   7 ;; Homepage: http://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating ledger entries.
  27 ;;
  28 ;; This differs from most standard languages in that
  29 ;;
  30 ;; 1) there is no such thing as a "session" in ledger
  31 ;;
  32 ;; 2) we are generally only going to return output from the ledger program
  33 ;;
  34 ;; 3) we are adding the "cmdline" header argument
  35 ;;
  36 ;; 4) there are no variables
  37
  38 ;;; Code:
  39 (require 'ob)
  40
  41 (defvar org-babel-default-header-args:ledger
  42   '((:results . "output") (:cmdline . "bal"))
  43   "Default arguments to use when evaluating a ledger source block.")
  44
  45 (defun org-babel-execute:ledger (body params)
  46   "Execute a block of Ledger entries with org-babel.  This function is
  47 called by `org-babel-execute-src-block'."
  48   (message "executing Ledger source code block")
  49   (let ((result-params (split-string (or (cdr (assoc :results params)) "")))
  50         (cmdline (cdr (assoc :cmdline params)))
  51         (in-file (org-babel-temp-file "ledger-"))
  52         (out-file (org-babel-temp-file "ledger-output-")))
  53     (with-temp-file in-file (insert body))
  54     (message "%s" (concat "ledger"
  55                           " -f " (org-babel-process-file-name in-file)
  56                           " " cmdline))
  57     (with-output-to-string
  58       (shell-command (concat "ledger"
  59                              " -f " (org-babel-process-file-name in-file)
  60                              " " cmdline
  61                              " > " (org-babel-process-file-name out-file))))
  62     (with-temp-buffer (insert-file-contents out-file) (buffer-string))))
  63
  64 (defun org-babel-prep-session:ledger (session params)
  65   (error "Ledger does not support sessions"))
  66
  67 (provide 'ob-ledger)
  68
  69
  70
  71 ;;; ob-ledger.el ends here