;; ob-hledger.el --- Babel Functions for hledger -*- lexical-binding: t; -*-
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;; Copyright (C) 2010-2018 Free Software Foundation, Inc.
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;; Author: Simon Michael
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;; Keywords: literate programming, reproducible research, plain text accounting
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Babel support for evaluating hledger entries.
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;;
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;; Based on ob-ledger.el.
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;; If the source block is empty, hledger will use a default journal file,
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;; probably ~/.hledger.journal (it may not notice your $LEDGER_FILE env var).
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;; So make ~/.hledger.journal a symbolic link to the real file if necessary.
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;;; Code:
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(require 'ob)
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(defvar org-babel-default-header-args:hledger
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'((:results . "output") (:exports . "results") (:cmdline . "bal"))
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"Default arguments to use when evaluating a hledger source block.")
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(defun org-babel-execute:hledger (body params)
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"Execute a block of hledger entries with org-babel.
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This function is called by `org-babel-execute-src-block'."
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(message "executing hledger source code block")
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(letrec ( ;(result-params (split-string (or (cdr (assq :results params)) "")))
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(cmdline (cdr (assq :cmdline params)))
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(in-file (org-babel-temp-file "hledger-"))
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(out-file (org-babel-temp-file "hledger-output-"))
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(hledgercmd (concat "hledger"
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(if (> (length body) 0)
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(concat " -f " (org-babel-process-file-name in-file))
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"")
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" " cmdline)))
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(with-temp-file in-file (insert body))
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;; TODO This is calling for some refactoring:
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;; (concat "hledger" (if ...) " " cmdline)
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;; could be built only once and bound to a symbol.
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(message "%s" hledgercmd)
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(with-output-to-string
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(shell-command (concat hledgercmd " > " (org-babel-process-file-name out-file))))
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(with-temp-buffer (insert-file-contents out-file) (buffer-string))))
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(defun org-babel-prep-session:hledger (_session _params)
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(error "hledger does not support sessions"))
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(provide 'ob-hledger)
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;;; ob-hledger.el ends here
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;; TODO Unit tests are more than welcome, too.
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