From 4229bcb6942584549b3a446b7660548781fca832 Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Sun, 23 Nov 2014 15:55:51 -0500
Subject: Add command to open first citekey heading link

---
 NEWS      |  6 ++++++
 README    |  1 +
 README.md |  1 +
 bog.el    | 23 +++++++++++++++++++++++
 4 files changed, 31 insertions(+)

diff --git a/NEWS b/NEWS
index 6bbf533..f6afb72 100644
--- a/NEWS
+++ b/NEWS
@@ -25,6 +25,12 @@
 - New command =bog-insert-heading-citekey= prompts with all heading
   citekeys and inserts the selected one at point.
 
+- New command =bog-open-first-citekey-link= opens the first link found
+  under the subtree of a citekey. This is particularly useful if you
+  place the main link for the study (usually a DOI link) as the first
+  link in the citekey's subtree. The citekey is either taken from at
+  point or selected from all heading citekeys.
+
 ** Other changes
 
 - =bog-goto-citekey-heading-in-buffer= and
diff --git a/README b/README
index 314b3b5..3e6eb3c 100644
--- a/README
+++ b/README
@@ -106,6 +106,7 @@ Other useful functions include
 - =bog-sort-topic-headings-in-buffer=
 - =bog-sort-topic-headings-in-notes=
 - =bog-insert-heading-citekey=
+- =bog-open-first-citekey-link=
 
 * Variables
 
diff --git a/README.md b/README.md
index 75246bd..ebf8698 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,7 @@ Other useful functions include
 -   `bog-sort-topic-headings-in-buffer`
 -   `bog-sort-topic-headings-in-notes`
 -   `bog-insert-heading-citekey`
+-   `bog-open-first-citekey-link`
 
 # Variables
 
diff --git a/bog.el b/bog.el
index 62722d8..3840ea4 100644
--- a/bog.el
+++ b/bog.el
@@ -767,6 +767,28 @@ current buffer."
                         'bog-all-heading-citekeys)))
     (insert (bog-select-citekey (funcall citekey-func)))))
 
+(defun bog-open-first-citekey-link (&optional no-context)
+  "Open first link under citekey heading.
+
+The citekey will be taken from the text under point if it matches
+`bog-citekey-format' or from the current tree.
+
+With prefix argument NO-CONTEXT, a prompt will open to select
+from all citekeys for headings in notes. This same prompt will be
+opened if locating a citekey from context fails."
+  (interactive "P")
+  (let* ((citekey (bog-citekey-from-point-or-all-headings no-context))
+         (marker
+          (org-find-exact-heading-in-directory citekey bog-notes-directory)))
+    (if marker
+        (with-current-buffer (marker-buffer marker)
+          (org-with-wide-buffer
+           (goto-char marker)
+           (org-narrow-to-subtree)
+           (org-next-link)
+           (org-open-at-point)))
+      (message "Heading for %s not found in notes" citekey))))
+
 
 ;;; Font-lock
 
@@ -873,6 +895,7 @@ chosen."
       (define-key prefix-map "h" 'bog-goto-citekey-heading-in-buffer)
       (define-key prefix-map "H" 'bog-goto-citekey-heading-in-notes)
       (define-key prefix-map "i" 'bog-citekey-tree-to-indirect-buffer)
+      (define-key prefix-map "l" 'bog-open-first-citekey-link)
       (define-key prefix-map "r" 'bog-rename-staged-file-to-citekey)
       (define-key prefix-map "s" 'bog-search-notes)
       (define-key prefix-map "w" 'bog-refile)
-- 
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