GNU bug report logs - #61371
30.0.50; Adding support for jdt:// file scheme in eglot

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From: Danny Freeman <danny <at> dfreeman.email>
To: Theodor Thornhill <theo <at> thornhill.no>
Cc: 61371 <at> debbugs.gnu.org, michael.albinus <at> gmx.de, joaotavora <at> gmail.com
Subject: bug#61371: 30.0.50; Adding support for jdt:// file scheme in eglot
Date: Fri, 10 Feb 2023 15:32:30 -0500

Theodor Thornhill <theo <at> thornhill.no> writes:

> Michael Albinus <michael.albinus <at> gmx.de> writes:
>
>> Theodor Thornhill via "Bug reports for GNU Emacs, the Swiss army knife
>> of text editors" <bug-gnu-emacs <at> gnu.org> writes:
>>
>>> Hi!
>>
>> Hi Theo,
>>
>>> When using Eglot along with Java there are some hacks that needs to be
>>> made to make things functional.  One of the more important things is to
>>> add support for the jdt:// file scheme that is sent when you try to
>>> go-to-definition on a system or third party lib.
>>>
>>> As you can see, we need to query the server with
>>> :java/classFileContents, and also register with the server to send it
>>> with the :extendedClientCapabilities on initialization.
>>>
>>> Is there a place this code could live? Maybe in the new java-ts-mode?
>>
>> There is the jarchive package on GNU ELPA. Could this be used, perhaps extended?
>>
>>> Theo
>>
>> Best regards, Michael.
>
> Maybe! Don't know what it does, but I'll check it out - thanks!
>
> Theo

JDT urls are outside the scope of jarchive. I would think of them less
as URLs and more as tokens to be decoded by the LSP server that provides
them. JDT urls are intended to be sent back to the LSP server using a
special extension method.

There is an issue open in the eglot-java repo to implement this but I
have been too busy to get around to it
https://github.com/yveszoundi/eglot-java/issues/6

Someone has responded there with some code similar to jarchive that will
parse the JDT urls and try to open them, but I wouldn't consider that a
permanent solution. JDT urls are not standardized and subject to change
by the JDT LSP maintainers.

-- 
Danny Freeman

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