term.el and Bash interaction

[Mark Plaksin]

Bash's magic for telling term.el what directory it's in overrides the
default-directory set in term-handle-ansi-terminal-messages.  It would be
better if term-handle-ansi-terminal-messages overrode what bash says.

If the EMACS environment variable contains "term" Bash assumes it's running
inside of Emacs in a term.el window and sends "\032/the/dir/bash/is/in\n"
to tell term.el what directory it is in.  term.el uses this to set
default-directory.

You can send other escape sequences to term.el to make it set
default-directory.  For example, 'ESCAnSiTc /home/happy' tells term.el I'm
in /home/happy.  Besides 'c' for directory you can use 'h' for host and 'u'
for user.  I use all of this to set default-directory to something
TRAMP-friendly in terms on remote machines.  That way I can use C-x C-f to
edit files on the remote host (whether I'm a regular user or root).

I can't find a combination of AnSiT settings which sets default-directory
correctly when you are root on the machine on which Emacs is running.  In
that case I pretend that I'm on a remote machine and make default-directory
be something like: /multi:ssh:address@hidden:su:address@hidden:/home/happy/

term-handle-ansi-terminal-messages sets default-directory to this but
term.el immediately resets default-directory to what Bash told it.  Since
Bash's behavior is automatic and have to go out of your way to send AnSiT
sequences, I think the AnSiT sequences should take precedence.