BREAKING CHANGE: This moves helpful.el out of core into :lang
emacs-lisp. Since most (all) people have this module enabled, this
shouldn't make a difference for most people, but if you're one of the
few that don't have :lang emacs-lisp enabled, Doom will revert to using
Emacs' built-in help.el and describe-* commands.
Others can also disable helpful with (package! helpful :disable t) if
they prefer Emacs' built-in help system, which wasn't possible before,
because it was a core package.
This was done as part of an ongoing effort to slim down Doom's core in
preparation for v3.
This can be used to extract paths from evil-ex style paths. e.g. the
following inserts the stdout into the current buffer (assuming we're in
~/some/project/filename.c):
:R!echo %:P ~/some/project
:R!echo %:t filename.c
:R!echo %:e c
:R!echo %:r filename
:R!echo ~/another/project/%:t:r.h
~/another/project/filename.h
:R % contents of current file
http://vimdoc.sourceforge.net/htmldoc/cmdline.html#filename-modifiers
has a full list of vim filename modifiers. Doom doesn't support all of
them, but it does support most of them.
