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lisp/ob-ledger/ob-ledger.el

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+;;; ob-ledger.el --- Babel Functions for Ledger      -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2010-2020 Free Software Foundation, Inc.
+
+;; Author: Eric S Fraga
+;; Keywords: literate programming, reproducible research, accounting
+;; Homepage: https://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