Fix remote-host directory tracking for shells in `term' buffersfix/bug-31355

* lisp/term.el (term-handle-ansi-terminal-messages): Use an explicit
tramp method when constructing the tramp path for a non-local host,
as this is now mandatory.  "-" is a pseudo-method for the user's
`tramp-default-method'.

Specify the remote username explicitly in all cases, as
`tramp-default-user' and `tramp-default-user-alist' could cause the
previous logic to fail.

Minor related improvements to the commentary.

(Bug#31355)

1 files changed, 16 insertions, 15 deletions

diff --git a/lisp/term.el b/lisp/term.el
index 75c27797838..419ddb2db5c 100644
--- a/lisp/term.el
+++ b/lisp/term.el
@@ -233,31 +233,33 @@
 ;;
 ;;  Notice: for directory/host/user tracking you need to have something
 ;; like this in your shell startup script (this is for a POSIXish shell
-;; like Bash but should be quite easy to port to other shells)
+;; like Bash but should be quite easy to port to other shells).
+;;
+;; For troubleshooting in Bash, you can check the definition of the
+;; custom functions with the "type" command.  e.g. "type cd".  If you
+;; do not see the expected definition from the config below, then the
+;; directory tracking will not work.
 ;;
 ;;             ----------------------------------------
 ;;
-;;  # Set HOSTNAME if not already set.
+;;	# Set HOSTNAME if not already set.
 ;;	: ${HOSTNAME=$(uname -n)}
 ;;
-;;  # su does not change this but I'd like it to
-;;
+;;	# su does not change this but I'd like it to
 ;;	USER=$(whoami)
 ;;
-;;  # ...
+;;	# ...
 ;;
 ;;	case $TERM in
 ;;	    eterm*)
 ;;
 ;;		printf '%s\n' \
 ;;		 -------------------------------------------------------------- \
-;;		 "Hello $user" \
+;;		 "Hello $USER" \
 ;;		 "Today is $(date)" \
 ;;		 "We are on $HOSTNAME running $(uname) under Emacs term mode" \
 ;;		 --------------------------------------------------------------
 ;;
-;;		export EDITOR=emacsclient
-;;
 ;;		# The \033 stands for ESC.
 ;;		# There is a space between "AnSiT?" and $whatever.
 ;;
@@ -269,10 +271,11 @@
 ;;		printf '\033AnSiTh %s\n' "$HOSTNAME"
 ;;		printf '\033AnSiTu %s\n' "$USER"
 ;;
-;;		eval $(dircolors $HOME/.emacs_dircolors)
+;;		# Use custom dircolors in term buffers.
+;;		# eval $(dircolors $HOME/.emacs_dircolors)
 ;;	esac
 ;;
-;;  # ...
+;;	# ...
 ;;
 ;;
 
@@ -2750,12 +2753,10 @@ See `term-prompt-regexp'."
 	(setq default-directory
 	      (file-name-as-directory
 	       (if (and (string= term-ansi-at-host (system-name))
-					(string= term-ansi-at-user (user-real-login-name)))
+                        (string= term-ansi-at-user (user-real-login-name)))
 		   (expand-file-name term-ansi-at-dir)
-		 (if (string= term-ansi-at-user (user-real-login-name))
-		     (concat "/" term-ansi-at-host ":" term-ansi-at-dir)
-		   (concat "/" term-ansi-at-user "@" term-ansi-at-host ":"
-			   term-ansi-at-dir)))))
+                 (concat "/-:" term-ansi-at-user "@" term-ansi-at-host ":"
+                         term-ansi-at-dir))))
 
 	;; I'm not sure this is necessary,
 	;; but it's best to be on the safe side.