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Enable 256 colors in fbterm.

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* lisp/term/fbterm.el: New file.

* doc/misc/efaq.texi (Emacs in a Linux console): Document the TERM
environment variable with which the new file is used.
This commit is contained in:
Gregory Heytings 2022-08-30 21:03:01 +00:00
parent bbc23ca8ab
commit 8807a4f532
2 changed files with 43 additions and 4 deletions
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20
doc/misc/efaq.texi
View File

@ -3047,23 +3047,35 @@ $ fc-list :spacing=mono family | sed 's/ /\\ /g'
You can now start Emacs inside @command{fbterm} with the command
@example
$ fbterm -- env TERM=fbterm emacs
@end example
In some versions of @command{fbterm}, setting @env{TERM} to
@samp{fbterm} can be omitted. To check whether it is needed, start
Emacs inside @command{fbterm} with the command
@example
$ fbterm -- emacs
@end example
@noindent
and type @kbd{M-x list-colors-display}. If only 8 colors are
displayed, it is necessary; if 256 colors are displayed, it isn't.
You may want to add an alias for that command in your shell
configuration file. For example, if you use Bash, you can add the
following line to your @file{~/.bashrc} file:
@example
alias emacs="fbterm -- emacs"
alias emacs="fbterm -- env TERM=fbterm emacs"
@end example
@noindent
or, if you use Emacs both in the Linux console and under X:
@example
[[ "$(tty)" =~ "/dev/tty" ]] && alias emacs="fbterm -- emacs"
[[ "$(tty)" =~ "/dev/tty" ]] && alias emacs="fbterm -- env TERM=fbterm emacs"
@end example
The @command{fbterm} terminal emulator may define a number of key
@ -3082,7 +3094,7 @@ start Emacs inside @command{fbterm} as root while ensuring that
@command{fbterm} does not define any key bindings for its own use:
@example
# capsh --drop=cap_sys_tty_config -- -c "fbterm -- emacs"
# capsh --drop=cap_sys_tty_config -- -c "fbterm -- env TERM=fbterm emacs"
@end example
Again you may want to add a shortcut for that command in the shell
@ -3096,7 +3108,7 @@ you use Bash, you can add the following function in the root user
@example
function emacs ()
@{
CMD="fbterm -- emacs "
CMD="fbterm -- env TERM=fbterm emacs "
for ARG in "$@@"
do
CMD="$CMD '$ARG' "

27
lisp/term/fbterm.el Normal file
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@ -0,0 +1,27 @@
;;; fbterm.el -*- lexical-binding:t -*-
;; Copyright (C) 2022 Free Software Foundation, Inc.
;; Note that, in some versions of fbterm, the TERM environment
;; variable is set to "linux". When that's the case, the code below
;; will not be executed, and only 8 colors will be available. It is
;; therefore necessary, with these versions of fbterm, to set that
;; environment variable to "fbterm" to enable its 256 color mode
;; extension. See also the node "Emacs in a Linux console" of the
;; Emacs FAQ.
(require 'term/xterm)
(defun terminal-init-fbterm ()
"Terminal initialization function for fbterm."
;; fbterm can't display underlines, even though its terminfo data
;; says it can.
(tty-no-underline)
;; fbterm supports xterm's 256 color mode extension.
(xterm-register-default-colors xterm-standard-colors))
(provide 'term/fbterm)
;;; fbterm.el ends here