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+;;; bog.el --- Extensions for research notes in Org mode
+
+;; Copyright (C) 2013 Kyle Meyer <kyle@kyleam.com>
+
+;; Author: Kyle Meyer <kyle@kyleam.com>
+;; URL: https://github.com/kyleam/bog
+;; Keywords: BibTeX, org-mode
+;; Version: 0.5.0
+;; Package-Requires: ((org "8.0.0") (dash "2.5.0"))
+
+;; 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; Bog provides a few convenience functions for taking research notes in
+;; Org mode.
+
+;;; Code:
+
+(require 'dash)
+(require 'org)
+
+
+;;; Customization
+
+(defgroup bog nil
+  "Extensions for research notes in Org mode"
+  :group 'tools
+  :group 'convenience)
+
+(defcustom bog-notes-directory "~/bib"
+  "The name of the directory that Org note are stored in."
+  :group 'bog
+  :type 'string)
+
+(defcustom bog-read-file-name 'read-file-name
+  "A function that will be used to promtp for file name.
+The function should accept one arguments, a string to use for the
+prompt. A good alternative is `ido-read-file-name'."
+  :group 'bog
+  :type 'function)
+
+(defcustom bog-completing-read 'completing-read
+  "A function that will be used for completion prompts.
+The function should accept two arguments, a string to use for the
+prompt and a list of strings to offer as choices. A good
+alternative is `ido-completing-read'."
+  :group 'bog
+  :type 'function)
+
+(defcustom bog-citekey-format
+  "\\([0-9]*[a-z]+[-a-z]*\\)\\([0-9]\\{4\\}\\)\\([a-z]+\\)"
+  "Regex used to match study citekey.
+By default, this matches any sequence of lower case
+letters (allowing hyphenation) that is followed by 4 digits and
+then lower case letters."
+  :type 'string
+  :group 'bog)
+
+
+;;; General utilities
+
+(defun bog-citekey-action (action ask-func ask-citekey)
+  "Perform ACTION on file associtated with a citekey.
+
+ASK-FUNC should be a function that queries the user for a citekey
+when ASK-CITEKEY is non-nil. Otherwise, the citekey will be taken
+from the text under point if it matches `bog-citekey-format' or
+from the first parent heading that matches `bog-citekey-format'.
+
+ACTION will be called with the resulting citekey as an argument."
+  (let* ((citekey (and ask-citekey (funcall ask-func)))
+         (citekey (or (bog-citekey-at-point)
+                      (bog-citekey-heading))))
+    (funcall action citekey)))
+
+(defun bog-select-citekey (citekeys)
+  "Prompt for citekey from CITEKEYS"
+  (funcall bog-completing-read "Select citekey: " citekeys))
+
+(defun bog-citekey-at-point ()
+  (let ((maybe-citekey (thing-at-point 'word)))
+    (when (and maybe-citekey
+               (bog-citekey-only-p maybe-citekey))
+      maybe-citekey)))
+
+(defun bog-citekey-heading ()
+  "Return first org heading that matches `bog-citekey-format'."
+  (save-excursion
+    (save-restriction
+      (widen)
+      (org-back-to-heading)
+      (let ((heading (org-element-property :raw-value (org-element-at-point))))
+        (while (and (not (bog-citekey-only-p heading))
+                    (org-up-heading-safe))
+          (setq heading
+                (org-element-property :raw-value (org-element-at-point))))
+        (when (not (bog-citekey-only-p heading))
+          (error "Citekey not found"))
+        heading))))
+
+(defun bog-citekey-p (text)
+  "Indicate if TEXT matches `bog-citekey-format'."
+  (when (string-match bog-citekey-format text)
+    t))
+
+(defun bog-citekey-only-p (text)
+  "Indicate if all of TEXT matches `bog-citekey-format'."
+  (string-match bog-citekey-format text)
+  (when (equal (length text) (match-end 0))
+    t))
+
+(provide 'bog)
+
+;; bog.el ends here