Re: [DISCUSSION] May we recognize everything like [[protocol:uri]] as a non-fuzzy link? (was: [BUG] URI handling is overly complicated and nonstandard [9.6.7 (N/A @ /gnu/store/mg7223g8mw90lccp6mm5g6f3mpjk70si-emacs-org-9.6.7/share/emacs/site-lisp/org-9.6.7/)])

[Ihor Radchenko <yantar92@posteo.net>]

Tom Gillespie <tgbugs@gmail.com> writes:

> My suggestion is as follows. Schemes/prefixes defined by the
> #+link: keyword can be used without surrounding syntax markers
> but may not contain spaces etc.

> ... To support this Org parsers
> should always parse prefix:suffix as a _putative_ link which
> must then be checked against a list of known schemes that
> are either built in or have been declared by the user to indeed
> be legitimate schemes.
>
> In the tel: case, the way to solve the original bug is simply
> to add the line #+link: tel tel: which would tell Org that e.g.
> tel:555-555-5555 is a real uri, and that it should expand to
> itself.

Currently, link abbreviations are explicitly allowed in bracket links
and only bracket links.

The currently available  way to force tel: link type is using angle
links:

<tel:555-555-5555>

No special #+link keyword is needed in the above example.

> At the same time this solution would avoid Arne's issue
> (which I also have in some of my documents where I have
> use fig: and tbl: as prefixes in names and reference them
> via [[fig:figure-name]]) because the parser would only treat
> prefix: in an internal link as a scheme if it is defined explicitly
> by the user in a #+link: keyword or in their init.el.

The most annoying part is that we have three not fully consistent link
markups:

http://plain-link.com
<http://angle-link.com>
[[http://bracket-link.com]]

The plain link only works for `org-link-types' - registered link types.

The angle link works all the time, unconditionally parsing <foo:bar>
with "foo" being link type and "bar" being link path. Abbreviations are ignored.

The bracket link works only for `org-link-types' __and__ link
abbreviations. If whatever inside brackets is not matching know link
type or abbreviation, it is considered a fuzzy link.


As you see, the situation might easily get confusing in corner cases.

My proposal aims to extend the bracket link a bit - the most commonly
used link type. However, it creates a problem with fuzzy links.
Even more problematic is plain link type where any kind of open syntax
will likely clash with normal text flow with innocent text like A:B
being suddenly considered a link.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>