BREAKING CHANGE: This deprecates the IS-(MAC|WINDOWS|LINUX|BSD) family
of global constants in favor of a native `featurep` check:
IS-MAC -> (featurep :system 'macos)
IS-WINDOWS -> (featurep :system 'windows)
IS-LINUX -> (featurep :system 'linux)
IS-BSD -> (featurep :system 'bsd)
The constants will stick around until the v3 release so folks can still
use it -- and there are still some modules that use it, but I'll phase
those uses out gradually.
Fix: #7479
Include ligature.el in a new set-font-ligatures! function, so that
"normal" (read: "font-based") ligatures can
also be controlled on a per-major mode basis from a user function
in configuration.
This commit also drops support for Emacs 27 to reduce the maintenance
burden.
BREAKING CHANGE: font ligatures for Harfbuzz/Coretext composition
table-based ligations are no longer controlled with
`+ligatures-composition-alist`, but is handled with
`+ligatures-prog-mode-list` and `+ligatures-all-modes-list` for most
common cases. See the README for the mode-specific methods
BREAKING CHANGE: the `:ui ligatures` module will not work anymore
with Emacs 27 or older. Also, there is no need to keep patched fonts
(for Fira, Hasklig, Iosevka) if you use the module. Update Emacs if
you want to keep using ligatures, or disable the module (`doom doctor`
will tell you if your current version of Emacs stopped working with
the module)
featurep! will be renamed modulep! in the future, so it's been
deprecated. They have identical interfaces, and can be replaced without
issue.
featurep! was never quite the right name for this macro. It implied that
it had some connection to featurep, which it doesn't (only that it was
similar in purpose; still, Doom modules are not features). To undo such
implications and be consistent with its namespace (and since we're
heading into a storm of breaking changes with the v3 release anyway),
now was the best opportunity to begin the transition.
To reduce redundancy, remove the maintenance hassle that version
constants would impose later on, and rely on built-in
facilities (featurep) more over global variables or doomisms, these
global constants have been deprecated in favor of Emacs "features":
- EMACS28+ -- replace with (> emacs-major-version 27)
- EMACS29+ -- replace with (> emacs-major-version 28)
- NATIVECOMP -- replace with (featurep 'native-compile)
- MODULES -- replace with (featurep 'dynamic-modules)
(These constants will be formally removed when v3 is released. The IS-*
constants are likely next, but I haven't decided on their substitutes
yet)
I also decided to follow native-compile's example and provide features
for Emacs' system features (since system-configuration-features' docs
outs itself as a poor method to detect features):
- dynamic-modules
- jansson
- native-compile -- this one already exists, but will instead be removed
if it's non-functional; i.e. (native-comp-available-p) returns nil.
These are now detectable using featurep, which is fast and built-in.
Users (or packages) may add entries directly to prettify-symbols-alist.
The module would mistaken that as a green light to activate
prettify-symbols-mode. Instead, only activate the mode if this module's
ligatures (or extra symbols) are specifically asked for.
