;; Author: Peter Breton <pbreton@cs.umb.edu>
;; Created: Sun Nov 17 1996
;; Keywords: processes
-;; Time-stamp: <1998-03-14 09:24:38 pbreton>
;; This file is part of GNU Emacs.
;; 1) Set your shell's prompt to contain the current working directory.
;; You may need to consult your shell's documentation to find out how to
;; do this.
-;;
-;; Note that directory tracking is done by matching regular expressions,
+;;
+;; Note that directory tracking is done by matching regular expressions,
;; therefore it is *VERY IMPORTANT* for your prompt to be easily
;; distinguishable from other output. If your prompt regexp is too general,
;; you will see error messages from the dirtrack filter as it attempts to cd
;; 2) Set the variable `dirtrack-list' to an appropriate value. This
;; should be a list of two elements: the first is a regular expression
;; which matches your prompt up to and including the pathname part.
-;; The second is a number which tells which regular expression group to
+;; The second is a number which tells which regular expression group to
;; match to extract only the pathname. If you use a multi-line prompt,
;; add 't' as a third element. Note that some of the functions in
;; 'comint.el' assume a single-line prompt (eg, comint-bol).
-;;
+;;
;; Determining this information may take some experimentation. Setting
;; the variable `dirtrack-debug' may help; it causes the directory-tracking
-;; filter to log messages to the buffer `dirtrack-debug-buffer'.
-;;
+;; filter to log messages to the buffer `dirtrack-debug-buffer'. You can easily
+;; toggle this setting with the `dirtrack-debug-toggle' function.
+;;
;; 3) Add a hook to shell-mode to enable the directory tracking:
;;
;; (add-hook 'shell-mode-hook
;; (function (lambda ()
-;; (setq comint-output-filter-functions
+;; (setq comint-preoutput-filter-functions
;; (append (list 'dirtrack)
-;; comint-output-filter-functions)))))
+;; comint-preoutput-filter-functions)))))
;;
;; You may wish to turn ordinary shell tracking off by calling
;; `shell-dirtrack-toggle' or setting `shell-dirtrackp'.
;; 'dirtrack-list' is set to (list "^\\([/~].*\\)\nemacs@[^%]+% *" 1 t)
;;
;; I'd appreciate other examples from people who use this package.
-;;
+;;
;; Here's one from Stephen Eglen:
;;
;; Running under tcsh:
;; (setq-default dirtrack-list '("^%E \\([^ ]+\\)" 1))
-;;
+;;
;; It might be worth mentioning in your file that emacs sources start up
;; files of the form: ~/.emacs_<SHELL> where <SHELL> is the name of the
;; shell. So for example, I have the following in ~/.emacs_tcsh:
-;;
+;;
;; set prompt = "%%E %~ %h% "
-;;
+;;
;; This produces a prompt of the form:
-;; %E /var/spool 10%
-;;
+;; %E /var/spool 10%
+;;
;; This saves me from having to use the %E prefix in other non-emacs
;; shells.
+;;
+;; A final note:
+;;
+;; I run LOTS of shell buffers through Emacs, sometimes as different users
+;; (eg, when logged in as myself, I'll run a root shell in the same Emacs).
+;; If you do this, and the shell prompt contains a ~, Emacs will interpret
+;; this relative to the user which owns the Emacs process, not the user
+;; who owns the shell buffer. This may cause dirtrack to behave strangely
+;; (typically it reports that it is unable to cd to a directory
+;; with a ~ in it).
+;;
+;; The same behavior can occur if you use dirtrack with remote filesystems
+;; (using telnet, rlogin, etc) as Emacs will be checking the local
+;; filesystem, not the remote one. This problem is not specific to dirtrack,
+;; but also affects file completion, etc.
;;; Code:
(defcustom dirtrack-list (list "^emacs \\([a-zA-Z]:.*\\)>" 1)
"*List for directory tracking.
First item is a regexp that describes where to find the path in a prompt.
-Second is a number, the regexp group to match. Optional third item is
-whether the prompt is multi-line. If nil or omitted, prompt is assumed to
+Second is a number, the regexp group to match. Optional third item is
+whether the prompt is multi-line. If nil or omitted, prompt is assumed to
be on a single line."
:group 'dirtrack
- :type '(sexp (regexp :tag "Prompt Expression")
+ :type '(sexp (regexp :tag "Prompt Expression")
(integer :tag "Regexp Group")
(boolean :tag "Multiline Prompt")
)
(make-variable-buffer-local 'dirtrackp)
-(defcustom dirtrack-directory-function
- (if (memq system-type (list 'ms-dos 'windows-nt))
+(defcustom dirtrack-directory-function
+ (if (memq system-type (list 'ms-dos 'windows-nt 'cygwin))
'dirtrack-windows-directory-function
'dirtrack-default-directory-function)
"*Function to apply to the prompt directory for comparison purposes."
:type 'function
)
-(defcustom dirtrack-canonicalize-function
- (if (memq system-type (list 'ms-dos 'windows-nt))
+(defcustom dirtrack-canonicalize-function
+ (if (memq system-type (list 'ms-dos 'windows-nt 'cygwin))
'downcase 'identity)
"*Function to apply to the default directory for comparison purposes."
:group 'dirtrack
:type 'function
)
+(defcustom dirtrack-directory-change-hook nil
+ "Hook that is called when a directory change is made."
+ :group 'dirtrack
+ :type 'hook
+ )
+
+
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Functions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun dirtrack-windows-directory-function (dir)
"Return a canonical directory for comparison purposes.
-Such a directory is all lowercase, has forward-slashes as delimiters,
+Such a directory is all lowercase, has forward-slashes as delimiters,
and ends with a forward slash."
(let ((directory dir))
(setq directory (downcase (dirtrack-replace-slash directory t)))
(concat directory "/")
directory)))
+(defun dirtrack-cygwin-directory-function (dir)
+ "Return a canonical directory taken from a Cygwin path for comparison purposes."
+ (if (string-match "/cygdrive/\\([A-Z]\\)\\(.*\\)" dir)
+ (concat (match-string 1 dir) ":" (match-string 2 dir))
+ dir))
+
(defconst dirtrack-forward-slash (regexp-quote "/"))
(defconst dirtrack-backward-slash (regexp-quote "\\"))
(defun dirtrack-replace-slash (string &optional opposite)
"Replace forward slashes with backwards ones.
-If additional argument is non-nil, replace backwards slashes with
+If additional argument is non-nil, replace backwards slashes with
forward ones."
- (let ((orig (if opposite
- dirtrack-backward-slash
+ (let ((orig (if opposite
+ dirtrack-backward-slash
dirtrack-forward-slash))
- (replace (if opposite
- dirtrack-forward-slash
+ (replace (if opposite
+ dirtrack-forward-slash
dirtrack-backward-slash))
(newstring string)
)
(setq dirtrackp (not dirtrackp))
(message "Directory tracking %s" (if dirtrackp "ON" "OFF")))
+(defun dirtrack-debug-toggle ()
+ "Enable or disable Dirtrack debugging."
+ (interactive)
+ (setq dirtrack-debug (not dirtrack-debug))
+ (message "Directory debugging %s" (if dirtrack-debug "ON" "OFF"))
+ (and dirtrack-debug
+ (display-buffer (get-buffer-create dirtrack-debug-buffer))))
+
(defun dirtrack-debug-message (string)
(let ((buf (current-buffer))
(debug-buf (get-buffer-create dirtrack-debug-buffer))
;;;###autoload
(defun dirtrack (input)
+ "Determine the current directory by scanning the process output for a prompt.
+The prompt to look for is the first item in `dirtrack-list'.
+
+You can toggle directory tracking by using the function `dirtrack-toggle'.
+
+If directory tracking does not seem to be working, you can use the
+function `dirtrack-debug-toggle' to turn on debugging output.
+
+You can enable directory tracking by adding this function to
+`comint-output-filter-functions'.
+"
(if (null dirtrackp)
nil
- (let ((prompt-path)
+ (let (prompt-path
+ matched
(current-dir default-directory)
- (matched)
(dirtrack-regexp (nth 0 dirtrack-list))
(match-num (nth 1 dirtrack-list))
(multi-line (nth 2 dirtrack-list))
(if (eq (point) (point-min))
nil
(save-excursion
- (goto-char (point-max))
- ;; Look for the prompt
- (if multi-line
- (setq matched
- (re-search-backward
- dirtrack-regexp
- comint-last-output-start
- t))
- (beginning-of-line)
- (setq matched (looking-at dirtrack-regexp)))
+ (setq matched (string-match dirtrack-regexp input)))
;; No match
(if (null matched)
(and dirtrack-debug
- (dirtrack-debug-message
- (format
- "Failed to match regexp: %s"
- dirtrack-regexp)))
- (setq prompt-path
- (buffer-substring-no-properties
+ (dirtrack-debug-message
+ (format
+ "Input `%s' failed to match regexp: %s"
+ input dirtrack-regexp)))
+ (setq prompt-path
+ (substring input
(match-beginning match-num) (match-end match-num)))
;; Empty string
(if (not (> (length prompt-path) 0))
(and dirtrack-debug
- (dirtrack-debug-message "Match is empty string"))
+ (dirtrack-debug-message "Match is empty string"))
;; Transform prompts into canonical forms
(setq prompt-path (funcall dirtrack-directory-function
prompt-path))
(setq current-dir (funcall dirtrack-canonicalize-function
current-dir))
(and dirtrack-debug
- (dirtrack-debug-message
+ (dirtrack-debug-message
(format
"Prompt is %s\nCurrent directory is %s"
- prompt-path current-dir)))
+ prompt-path current-dir)))
;; Compare them
(if (or (string= current-dir prompt-path)
- (string= current-dir
+ (string= current-dir
(abbreviate-file-name prompt-path)))
(and dirtrack-debug
- (dirtrack-debug-message
+ (dirtrack-debug-message
(format "Not changing directory")))
;; It's possible that Emacs will think the directory
;; won't exist (eg, rlogin buffers)
(if (file-accessible-directory-p prompt-path)
;; Change directory
(and (shell-process-cd prompt-path)
+ (run-hooks 'dirtrack-directory-change-hook)
dirtrack-debug
- (dirtrack-debug-message
+ (dirtrack-debug-message
(format "Changing directory to %s" prompt-path)))
(error "Directory %s does not exist" prompt-path)))
- )))))))
+ )))))
+ input)
(provide 'dirtrack)
+;;; arch-tag: 168de071-be88-4937-aff6-2aba9f328d5a
;;; dirtrack.el ends here