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;;; ob-ledger.el --- Babel Functions for Ledger -*- lexical-binding: t; -*-
;; Copyright (C) 2010-2017 Free Software Foundation, Inc.
;; Author: Eric S Fraga
;; Keywords: literate programming, reproducible research, accounting
;; Homepage: http://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating ledger entries.
;;
;; This differs from most standard languages in that
;;
;; 1) there is no such thing as a "session" in ledger
;;
;; 2) we are generally only going to return output from the ledger program
;;
;; 3) we are adding the "cmdline" header argument
;;
;; 4) there are no variables
;;; Code:
(require 'ob)
(defvar org-babel-default-header-args:ledger
'((:results . "output") (:cmdline . "bal"))
"Default arguments to use when evaluating a ledger source block.")
(defun org-babel-execute:ledger (body params)
"Execute a block of Ledger entries with org-babel. This function is
called by `org-babel-execute-src-block'."
(message "executing Ledger source code block")
(let ((cmdline (cdr (assq :cmdline params)))
(in-file (org-babel-temp-file "ledger-"))
(out-file (org-babel-temp-file "ledger-output-")))
(with-temp-file in-file (insert body))
(message "%s" (concat "ledger"
" -f " (org-babel-process-file-name in-file)
" " cmdline))
(with-output-to-string
(shell-command (concat "ledger"
" -f " (org-babel-process-file-name in-file)
" " cmdline
" > " (org-babel-process-file-name out-file))))
(with-temp-buffer (insert-file-contents out-file) (buffer-string))))
(defun org-babel-prep-session:ledger (_session _params)
(error "Ledger does not support sessions"))
(provide 'ob-ledger)
;;; ob-ledger.el ends here
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