bug#48439: 28.0.50; Support for the Alacritty terminal emulator

[Tassilo Horn]

I use the Alacritty terminal emulator [1].  I've noticed that with
"emacs -nw" or "emacsclient -t" my terminal emacs was just white on
black, no colors at all.  It seems it's because emacs doesn't know how
to handle TERM=alacritty which Alacritty sets if the terminfo database
knows it, otherwise it'll set TERM=xterm-256color.

So I can either set TERM=xterm-256color in my Alacritty config or use
the following patch to alias alacritty to xterm in Emacs.

--8<---------------cut here---------------start------------->8---
1 file changed, 1 insertion(+), 1 deletion(-)
lisp/faces.el | 2 +-

modified   lisp/faces.el
@@ -46,7 +46,7 @@ term-file-aliases
     ("vt320" . "vt200")
     ("vt400" . "vt200")
     ("vt420" . "vt200")
-    )
+    ("alacritty" . "xterm"))
   "Alist of terminal type aliases.
 Entries are of the form (TYPE . ALIAS), where both elements are strings.
 This means to treat a terminal of type TYPE as if it were of type ALIAS."
--8<---------------cut here---------------end--------------->8---

IMHO, it would make sense to have that alias is place at least until
someone comes up with "proper" support for Alacritty.

[1] https://github.com/alacritty/alacritty


In GNU Emacs 28.0.50 (build 4, x86_64-pc-linux-gnu, GTK+ Version 3.24.29, cairo 
version 1.17.4)
 of 2021-05-15 built on thinkpad-t440p
Repository revision: 248ec838aa8b1a720a05b422be760f6ab32aa630
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101001
System Description: Arch Linux

Configured using:
 'configure --with-modules --with-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
X11 XDBE XIM XPM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
  value of $LANG: en_US.UTF-8
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Major mode: mu4e:main

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  yas-global-mode: t
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  magit-auto-revert-mode: t
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  recentf-mode: t
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  save-place-mode: t
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  electric-indent-mode: t
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  auto-composition-mode: t
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/home/horn/.emacs.d/elpa/transient-20210427.833/transient hides 
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