lisp/ob-ledger.el

   1 ;;; ob-ledger.el --- org-babel functions for ledger evaluation
   2
   3 ;; Copyright (C) 2010  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric S Fraga
   6 ;; Keywords: literate programming, reproducible research, accounting
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 7.3
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating ledger entries.
  28 ;;
  29 ;; This differs from most standard languages in that
  30 ;;
  31 ;; 1) there is no such thing as a "session" in ledger
  32 ;;
  33 ;; 2) we are generally only going to return output from the leger program
  34 ;;
  35 ;; 3) we are adding the "cmdline" header argument
  36 ;;
  37 ;; 4) there are no variables
  38
  39 ;;; Code:
  40 (require 'ob)
  41
  42 (defvar org-babel-default-header-args:ledger
  43   '((:results . "output") (:cmdline . "bal"))
  44   "Default arguments to use when evaluating a ledger source block.")
  45
  46 (defun org-babel-execute:ledger (body params)
  47   "Execute a block of Ledger entries with org-babel.  This function is
  48 called by `org-babel-execute-src-block'."
  49   (message "executing Ledger source code block")
  50   (let ((result-params (split-string (or (cdr (assoc :results params)) "")))
  51         (cmdline (cdr (assoc :cmdline params)))
  52         (in-file (org-babel-temp-file "ledger-"))
  53         (out-file (org-babel-temp-file "ledger-output-")))
  54     (with-temp-file in-file (insert body))
  55     (message (concat "ledger"
  56                      " -f " (org-babel-process-file-name in-file)
  57                      " " cmdline))
  58     (with-output-to-string
  59       (shell-command (concat "ledger"
  60                              " -f " (org-babel-process-file-name in-file)
  61                              " " cmdline
  62                              " > " (org-babel-process-file-name out-file))))
  63     (with-temp-buffer (insert-file-contents out-file) (buffer-string))))
  64
  65 (defun org-babel-prep-session:ledger (session params)
  66   (error "Ledger does not support sessions"))
  67
  68 (provide 'ob-ledger)
  69
  70 ;; arch-tag: 7bbb529e-95a1-4236-9d29-b0000b918c7c
  71
  72 ;;; ob-ledger.el ends here