Re: Orgmode for budgeting/expense recording

[Eric S Fraga <ucecesf@ucl.ac.uk>]

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At Fri, 02 Oct 2009 11:55:22 +0100,
Eric S Fraga wrote:
> It would be interesting to see a org-babel interface to ledger...
> what ledger is missing, in the context of emacs, is an easy way to see
> the actual output of the ledger command (e.g. bal or reg) while
> looking at the ledger file.

okay, interesting enough that I've done a first attempt (good enough
for what I need but probably incredibly clumsy elisp code as I'm
really not an elisp programmer...).  Attached is org-babel-ledger.el
which works with this simple example ledger:

--8<---------------cut here---------------start------------->8---
#+begin_src ledger :results output :cmdline -s bal
2009/09/30 salary
  account:bank       £2000.00
  income:salary
2009/10/01 rent
  payee:landlord     £ 500.00
  account:bank
#+end_src ledger
--8<---------------cut here---------------end--------------->8---

If you change "-s bal" to "reg" you get a register output, for
instance.  I have no idea what happens if you try some of the esoteric
ledger commands but I only tend to use bal and reg with various
arguments...

Works on Debian linux with emacs 23 and most recent org and org-babel.

The definitely clumsy code is in extracting the output of the ledger
command so any input would be more than welcome!

Oh, use by (require 'org-babel-ledger) as per the other languages...

Thanks,
eric


[-- Attachment #2: org-babel-ledger.el --]
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;;; org-babel-ledger.el --- org-babel functions for ledger evaluation

;; Copyright (c) 2009 Eric S Fraga

;; based on code by
;; Copyright (C) 2009 Eric Schulte

;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 0.01

;;; License:

;; This program 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, or (at your option)
;; any later version.
;;
;; This program 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; 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 leger program
;;
;; 3) we are adding the "cmdline" header argument
;;
;; 4) there are no variables

;;; Code:
(require 'org-babel)

(org-babel-add-interpreter "ledger")

(add-to-list 'org-babel-tangle-langs '("ledger" "ledger"))

(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 ((result-params (split-string (or (cdr (assoc :results params)) "")))
	(cmdline (cdr (assoc :cmdline params)))
        (in-file (make-temp-file "org-babel-ledger"))
	(out-file (make-temp-file "org-babel-ledger-output"))
	)
    (with-temp-file in-file (insert body))
    (message (concat "ledger -f " in-file " " cmdline))
    (with-output-to-string (shell-command (concat "ledger -f " in-file " " cmdline " > " 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 'org-babel-ledger)
;;; org-babel-ledger.el ends here

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