+#+BEGIN_SRC emacs-lisp :tangle doi-utils.el
+(defun doi-utils-add-entry-from-crossref-query (query bibtex-file)
+ (interactive (list
+ (read-input
+ "Query: "
+ ;; now set initial input
+ (cond
+ ;; If region is active assume we want it
+ ((region-active-p)
+ (buffer-susbstring (region-beginning) (region-end)))
+ ;; type or paste it in
+ (t
+ nil)))
+ (ido-completing-read
+ "Bibfile: "
+ (append (f-entries "." (lambda (f) (f-ext? f "bib")))
+ org-ref-default-bibliography))))
+ (let* ((json-string)
+ (json-data)
+ (doi))
+
+ (with-current-buffer
+ (url-retrieve-synchronously
+ (concat
+ "http://search.crossref.org/dois?q="
+ (url-hexify-string query)))
+ (setq json-string (buffer-substring url-http-end-of-headers (point-max)))
+ (setq json-data (json-read-from-string json-string)))
+
+ (let* ((name (format "Crossref hits for %s" query))
+ (helm-candidates (mapcar (lambda (x)
+ (cons
+ (concat
+ (cdr (assoc 'fullCitation x))
+ " "
+ (cdr (assoc 'doi x)))
+ (cdr (assoc 'doi x))))
+ json-data))
+ (source `((name . ,name)
+ (candidates . ,helm-candidates)
+ ;; just return the candidate
+ (action . (("Insert bibtex entry" . (lambda (doi)
+ (doi-utils-add-bibtex-entry-from-doi
+ (replace-regexp-in-string "^http://dx.doi.org/" "" doi))))
+ ("Open url" . (lambda (doi)
+ (browse-url doi))))))))
+ (helm :sources '(source)))))
+#+END_SRC