Re: Towards a cleaner build: tags

[Dmitry Gutov <dgutov@yandex.ru>]

On 15.06.2019 19:11, Lars Ingebrigtsen wrote:
> 27% of the remaining Warning: lines are related to the introduction of
> the new xref code, I think:
> 
> emulation/viper-ex.el:2019:16:Warning: `find-tag' is an obsolete function (as
>      of 25.1); use `xref-find-definitions' instead.
> emulation/viper-ex.el:2020:14:Warning: `find-tag-other-window' is an obsolete
>      function (as of 25.1); use `xref-find-definitions-other-window' instead.
> eshell/esh-mode.el:499:6:Warning: `find-tag' is an obsolete function (as of
>      25.1); use `xref-find-definitions' instead.
> textmodes/reftex-global.el:101:6:Warning: tags-query-replace called with 4
>      arguments, but accepts only 2-3
> vc/vc-dir.el:826:4:Warning: tags-query-replace called with 4 arguments, but
>      accepts only 2-3
> 
> These functions are obsolete (or are called with the wrong number of
> arguments), but as far as I can tell, there are no direct substitutions
> for these functions (or arguments).
> 
> As Emacs 25.1 was a while ago, it would be really nice if somebody were
> to write the glue code what would allow us to get rid of these
> warnings.  :-)

FWIW, I believe tags-query-replace has an adequate replacement already 
in the fileloop package (as you can see it's already implemented in 
terms of it). That would take care of the last two warnings.

esh-mode.el has a peculiar use for find-tag in creating a special 
version of it that "ignores whether the text is read-only". I'm not sure 
why that would matter since the command does not modify the buffer 
contents. Should we just remove the command and the custom binding? Not 
sure if eshell-mode just set up xref-find-functions as well. Is it 
supposed to use a tags table, or find-func.el?

As for viper, I guess the emulation stuff has some UI requrements? 
Otherwise we could use xref-find-definitions and 
xref-find-definitions-other-window there.