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authorSteve Lee <me@xiangyangli.com>2017-12-13 03:29:05 +0800
committerSteve Lee <me@xiangyangli.com>2017-12-13 03:29:05 +0800
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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