From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Schulte <eric.schulte@gmx.com>
Subject: Re: building tagcloud datastructure in elisp
Date: Wed, 12 Sep 2012 12:58:40 -0600
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In-Reply-To: <CACHMzOHitX5sDPu5AN+voFCN15NMAZLsPRXo4Un5t43HOe1gjA@mail.gmail.com>
	(Marcelo de Moraes Serpa's message of "Wed, 12 Sep 2012 13:41:35
	-0500")
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To: Marcelo de Moraes Serpa <celoserpa@gmail.com>
Cc: Org Mode <emacs-orgmode@gnu.org>

Marcelo de Moraes Serpa <celoserpa@gmail.com> writes:

> Hi list,
>
> How hard would it be to parse a bunch of org files and build an elisp data
> structure (Hash?) that represents a tagcloud? All tags in all headlines and
> subtrees should be taken into account (for all org files that are parsed).
> Could I use org-element to help me parse this or is there a better way?
>
> I'm just learning the org API, and I've only done a bunch of elisp hacks,
> so any insight would be greatly appreciated!
>
> Thanks,
>
> - Marcelo.

My favorite method of getting word frequencies from text files is the
following.  Sometimes it is easier to just Org-mode files as text files
rather than to use e-lisp.

    # -*- shell-script -*-
    many=20 # to print the 20 most popular words
    cat org-file.org \
        |tr -cs A-Za-z '\n' \
        |tr A-Z a-z \
        |sort \
        |uniq -c \
        |sort -rn \
        |sed ${many}q \
        |sed 's/^ *//' \
        |sed 's/\([^ ]*\) \([^ ]*\)/\2:\1/' \
        |tr '\n' ' ' \
        |sed 's/ $/\n/'

Adapted from http://www.leancrew.com/all-this/2011/12/more-shell-less-egg/

Best,

-- 
Eric Schulte
http://cs.unm.edu/~eschulte