Enable 256 colors in fbterm.

* 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.

1 files changed, 27 insertions, 0 deletions

diff --git a/lisp/term/fbterm.el b/lisp/term/fbterm.el
new file mode 100644
index 00000000000..ad7150c1a1f
--- /dev/null
+++ b/lisp/term/fbterm.el
@@ -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