Re: More helm awesomeness

[Simon Thum <simon.thum@gmx.de>]

Hi John,

thank you for the fast response! That's more than I had hoped for, I'm 
sure I'll get through now. I'll report back when something tangible is 
there.

Cheers,

Simon

On 01/19/2015 04:57 PM, John Kitchin wrote:
> You can do something like this to get just the TODO headlines in the
> current buffer. If you make the helm-todo-candidates map over all the
> files in (org-agenda-files) you can make it give all the TODO
> headings. You can change the match criteria in org-map-entries to be
> more selective.
>
> #+BEGIN_SRC emacs-lisp :results raw
> (defun helm-todo-candidates ()
>    (let ((results '()))
>      (org-map-entries
>       (lambda ()
>         (add-to-list 'results
>                      (cons
>                       (concat (make-string (nth 1 (org-heading-components)) ?*)
>                               " TODO "
>                               (nth 4 (org-heading-components)))
>                       (point-marker))))
>       "TODO=\"TODO\"")
>      results))
> #+END_SRC
>
> #+RESULTS:
> ((** post it . #<marker at 977 in blog.org>) (** work it out . #<marker at 941 in blog.org>))
>
> Now to run helm, there is a subtle point. We need to map the current buffer /before/ running helm, otherwise we will map an empty helm buffer.
>
> #+BEGIN_SRC emacs-lisp
> (defun helm-todo ()
>    "Helm interface to headlines with TODO status in current buffer."
>    (interactive)
>    (let ((candidates (helm-todo-candidates)))
>      (setq helm-todo-source '((name . "TODO headlines")
>                               (candidates . candidates)
>                               (action . (("open" . goto-char)))))
>      (helm :sources '(helm-todo-source))))
>
> (helm-todo)
> Simon Thum writes:
>
>> Hi all,
>>
>> I recently updated my helm install so it includes
>> helm-org-agenda-headings which is just AWESOME (to me at least). A bit
>> like org-goto but across all agenda files at once, with goto, refile,
>> linking built in. If you haven't tried it, I definitely recommend to do so.
>>
>>
>> Yet I'm missing a few things so far, I would like to have different
>> datasources differentiated by tags, in particular the ARCHIVE tag, and
>> the infamous FILETAGS so I cannot just regex my way through as the
>> current approach does.
>>
>> This requires making more use of org-ode when filling helm's buffers. My
>> elisp isn't great but I might be able to get there if the approach is sane.
>>
>> Any pointers are welcome! If you might help me please read on.
>>
>> I would like to ask what would be the best approach for better utilising
>> org infrastructure so I may have separate helm sources for
>> live/archived, private/work, the clocking history, stuff like that.
>>
>> The helm-org definition looks deceptively simple:
>>
>> https://github.com/emacs-helm/helm/blob/master/helm-org.el
>>
>> (defun helm-org-agenda-files-headings ()
>> (interactive)
>> (helm :sources (helm-source-org-headings-for-files (org-agenda-files))
>> :candidate-number-limit 99999
>> :buffer "*helm org headings*"))
>>
>>
>> FWICT, in effect helm-org is chewing itself through the buffers:
>>
>> (defun helm-get-org-candidates-in-file (filename min-depth max-depth
>> &optional fontify)
>> (with-current-buffer (find-file-noselect filename)
>> (and fontify (jit-lock-fontify-now))
>> (let ((match-fn (if fontify 'match-string 'match-string-no-properties)))
>> (save-excursion
>> (goto-char (point-min))
>> (cl-loop while (re-search-forward org-complex-heading-regexp nil t)
>> if (let ((num-stars (length (match-string-no-properties 1))))
>> (and (>= num-stars min-depth) (<= num-stars max-depth)))
>> collect `(,(funcall match-fn 0) . ,(point-marker)))))))
>>
>> I don't really get what it does but I have a hunch that org-element or
>> other org-mode functions could be used to achieve the same with more
>> precision. That's what I would need to do. FWIW I'd be happy to take a
>> performance hit.
>>
>> Thanks in advance,
>>
>> Simon
>
> --
> Professor John Kitchin
> Doherty Hall A207F
> Department of Chemical Engineering
> Carnegie Mellon University
> Pittsburgh, PA 15213
> 412-268-7803
> @johnkitchin
> http://kitchingroup.cheme.cmu.edu
>