From d90c0d8417fcc8dc93a5745825be7af3fec8e905 Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Sun, 2 Feb 2014 23:53:05 -0500
Subject: Add function to find citekey PDF

---
 bog.el | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/bog.el b/bog.el
index 971b811..aa52749 100644
--- a/bog.el
+++ b/bog.el
@@ -44,6 +44,12 @@
   :group 'bog
   :type 'string)
 
+(defcustom bog-pdf-directory
+  (expand-file-name "pdfs" bog-notes-directory)
+  "The name of the directory that PDF files 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
@@ -59,6 +65,11 @@ alternative is `ido-completing-read'."
   :group 'bog
   :type 'function)
 
+(defcustom bog-pdf-opener "xdg-open"
+  "Program to open PDF files with."
+  :group 'bog
+  :type 'string)
+
 (defcustom bog-citekey-format
   "\\([0-9]*[a-z]+[-a-z]*\\)\\([0-9]\\{4\\}\\)\\([a-z]+\\)"
   "Regex used to match study citekey.
@@ -121,6 +132,38 @@ ACTION will be called with the resulting citekey as an argument."
   (when (equal (length text) (match-end 0))
     t))
 
+
+;;; PDF-related
+
+;;;###autoload
+(defun bog-find-citekey-pdf (arg)
+  "Open PDF file for a citekey.
+If a prefix argument is given, a prompt will open to select from
+available citekeys. 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'."
+  (interactive "P")
+  (bog-citekey-action 'bog-open-citekey-pdf
+                      '(lambda () (bog-select-citekey (bog-pdf-citekeys)))
+                      arg))
+
+(defun bog-open-citekey-pdf (citekey)
+  (let ((pdf-file (bog-citekey-as-pdf citekey)))
+    (unless (file-exists-p pdf-file)
+      (error "%s does not exist" pdf-file))
+    (start-process "bog-pdf" nil bog-pdf-opener pdf-file)))
+
+(defun bog-citekey-as-pdf (citekey)
+  (expand-file-name (concat citekey ".pdf") bog-pdf-directory))
+
+(defun bog-pdf-citekeys ()
+  "Return a list citekeys for all pdf files in
+`bog-pdf-directory'."
+  (-map 'file-name-base
+        (file-expand-wildcards (concat
+                                (file-name-as-directory bog-pdf-directory)
+                                "*.pdf"))))
+
 (provide 'bog)
 
 ;; bog.el ends here
-- 
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