Speed up redisplay in ansi-term mode

[gnu-emacs] / lisp / term.el

diff --git a/lisp/term.el b/lisp/term.el
index 5dd965d2d34c056b61ebbc2af3def4ee8aa0a779..8cdf0c0e77c44c4a5558475213e1d3f7b8c10e3e 100644 (file)
--- a/lisp/term.el
+++ b/lisp/term.el
@@ -1,6 +1,6 @@
 ;;; term.el --- general command interpreter in a window stuff
 
-;; Copyright (C) 1988, 1990, 1992, 1994-1995, 2001-2015 Free Software
+;; Copyright (C) 1988, 1990, 1992, 1994-1995, 2001-2016 Free Software
 ;; Foundation, Inc.
 
 ;; Author: Per Bothner <per@bothner.com>
@@ -1454,6 +1454,13 @@ Using \"emacs\" loses, because bash disables editing if $TERM == emacs.")
           (format "TERMINFO=%s" data-directory)
           (format term-termcap-format "TERMCAP="
                   term-term-name term-height term-width)
+
+          ;; This is for backwards compatibility with Bash 4.3 and earlier.
+          ;; Remove this hack once Bash 4.4-or-later is common, because
+          ;; it breaks './configure' of some packages that expect it to
+          ;; say where to find EMACS.
+          (format "EMACS=%s (term:%s)" emacs-version term-protocol-version)
+
           (format "INSIDE_EMACS=%s,term:%s" emacs-version term-protocol-version)
           (format "LINES=%d" term-height)
           (format "COLUMNS=%d" term-width))
@@ -4144,7 +4151,17 @@ the process.  Any more args are arguments to PROGRAM."
     ;; .emacs ...
     (term-set-escape-char ?\C-x))
 
-  (switch-to-buffer term-ansi-buffer-name))
+  (switch-to-buffer term-ansi-buffer-name)
+  ;; For some reason, without the below setting, ansi-term behaves
+  ;; sluggishly, not clear why, since the buffer is typically very
+  ;; small.
+  ;;
+  ;; There's a larger problem here with supporting bidirectional text:
+  ;; the application that writes to the terminal could have its own
+  ;; ideas about displaying bidirectional text, and might not want us
+  ;; reordering the text or deciding on base paragraph direction.  One
+  ;; such application is Emacs in TTY mode...  FIXME.
+  (setq bidi-paragraph-direction 'left-to-right))
 
 \f
 ;;; Serial terminals