Bug#963885: RFP: gollum -- simple, Git-powered wiki with a sweet API and local frontend

[Antoine Beaupre <anarcat@debian.org>]

Package: wnpp
Severity: wishlist

* Package name    : gollum
  Version         : 5.0.1
  Upstream Author : https://github.com/orgs/gollum/people
* URL             : https://github.com/gollum/gollum
* License         : MIT
  Programming Lang: Ruby
  Description     : simple, Git-powered wiki with a sweet API and local frontend

Gollum is a simple wiki system built on top of Git. A Gollum Wiki is
simply a git repository of a specific nature:

 * A Gollum repository's contents are human-editable text or markup files.
 * Pages may be organized into directories any way you choose.
 * Other content can also be included, for example images, PDFs and
   headers/footers for your pages.
 * Gollum pages:
   * May be written in a variety of markups.
   * Can be edited with your favourite system editor or IDE (changes
     will be visible after committing) or with the built-in web
     interface.
   * Can be displayed in all versions, reverted, etc.
 * Gollum strives to be compatible with GitHub wikis (see
   --lenient-tag-lookup) 
 * Gollum supports advanced functionality like:
   * UML diagrams
   * BibTeX and Citation support
   * Annotations using CriticMarkup
   * Mathematics via MathJax
   * Macros
   * Redirects
   * RSS Feed of latest changes
   * ...and more

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Curiously, Gollum is not packaged in Debian. The GitLab fork is:

https://gitlab.com/gitlab-org/gollum-lib

... but not the upstream Gollum. This would be fine if we actually had
a Gollum binary, but gollum-lib is just that: a library, without an
actual binary that renders the wiki.

That's really too bad! GitLab has nice little instructions on how to
preview your changes locally when you do edits in a clone of a wiki,
but those cannot be run on Debian because Gollum is missing...

Another similar program that is planned to be packaged in Debian is
"realms-wiki":

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895760

... and there are of course many, many more wikis packaged in
Debian. But I think "GitHub/GitLab compatibility" should be important
enough to warrant a new one...