* Helm interface
[[https://github.com/tmalsburg/helm-bibtex][helm-bibtex]] is a very cool interface to bibtex files. Out of the box though, it is not super convenient for org-ref. Here, we modify it to make it fit our workflow and extend it where needed.
+Let us add keywords as a searchable field.
+#+BEGIN_SRC emacs-lisp
+(setq helm-bibtex-additional-search-fields '(keywords))
+#+END_SRC
+
+Next, we are going to add keywords to the helm interface.
+#+BEGIN_SRC emacs-lisp
+(defun helm-bibtex-candidates-formatter (candidates source)
+ "Formats BibTeX entries for display in results list."
+ (cl-loop
+ with width = (with-helm-window (window-width))
+ for entry in candidates
+ for entry = (cdr entry)
+ for entry-key = (helm-bibtex-get-value entry 'entry-key)
+ for fields = (--map (helm-bibtex-clean-string
+ (helm-bibtex-get-value entry it " "))
+ '(author title year has-pdf has-note entry-type))
+ for fields = (-update-at 0 'helm-bibtex-shorten-authors fields)
+ for fields = (append fields
+ (list (or (helm-bibtex-get-value entry 'keywords)
+ "" )))
+ collect
+ (cons (s-format "$0 $1 $2 $3 $4$5 $6" 'elt
+ (-zip-with (lambda (f w) (truncate-string-to-width f w 0 ?\s))
+ fields (list 36 (- width 85) 4 1 1 7 7)))
+ entry-key)))
+
+#+END_SRC
+
1. Make the default action to insert selected keys.
2. Make open entry second action
#+BEGIN_SRC emacs-lisp :tangle org-ref.el
+(defun org-ref-tag-entries (candidates)
+ "Set tags on selected entries."
+ (let ((keywords (read-input "Keywords (comma separated): ")))
+ (loop for key in (helm-marked-candidates)
+ do
+ (save-window-excursion
+ (helm-bibtex-show-entry key)
+ (bibtex-set-field
+ "keywords"
+ (concat
+ keywords
+ "," (bibtex-autokey-get-field "keywords")))
+ (save-buffer)))))
+
(setq helm-source-bibtex
'((name . "BibTeX entries")
(init . helm-bibtex-init)
("Show entry" . helm-bibtex-show-entry)
("Open PDF file (if present)" . helm-bibtex-open-pdf)
("Open URL or DOI in browser" . helm-bibtex-open-url-or-doi)
- ("Insert reference" . helm-bibtex-insert-reference)
+ ("Insert formatted reference" . helm-bibtex-insert-reference)
("Insert BibTeX key" . helm-bibtex-insert-key)
("Insert BibTeX entry" . helm-bibtex-insert-bibtex)
("Attach PDF to email" . helm-bibtex-add-PDF-attachment)
("Edit notes" . helm-bibtex-edit-notes)
+ ("Tag entries" . org-ref-tag-entries)
))))
#+END_SRC