;;; dirtrack.el --- Directory Tracking by watching the prompt
-;; Copyright (C) 1996 Free Software Foundation, Inc.
+;; Copyright (C) 1996, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
-;; Author: Peter Breton
+;; Author: Peter Breton <pbreton@cs.umb.edu>
;; Created: Sun Nov 17 1996
;; Keywords: processes
-;; Time-stamp: <96/12/26 09:23:01 peter>
;; This file is part of GNU Emacs.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
-;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; 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
;; to non-existent directories.
;;
-;; 2) Set the variable 'dirtrack-list' to an appropriate value. This
+;; 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'.
+;; the variable `dirtrack-debug' may help; it causes the directory-tracking
+;; filter to log messages to the buffer `dirtrack-debug-buffer'. You can easily
+;; toggle this setting with the `dirtrack-debug-toggle' function.
;;
-;; 3) Autoload directory tracking by adding the following to your .emacs:
-;;
-;; (autoload 'dirtrack "dirtrack"
-;; "Directory tracking by watching the prompt")
-;;
-;; 4) Add a hook to shell-mode to enable the directory tracking:
+;; 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'.
+;; `shell-dirtrack-toggle' or setting `shell-dirtrackp'.
;;
;; Examples:
;;
;; '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%
+;;
+;; 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:
(require 'comint)
(require 'shell))
-(defvar dirtrack-list (list "^emacs \\([a-zA-Z]:.*\\)>" 1)
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Customization Variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup dirtrack nil
+ "Directory tracking by watching the prompt."
+ :prefix "dirtrack-"
+ :group 'shell)
+
+(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
-be on a single line.")
+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")
+ (integer :tag "Regexp Group")
+ (boolean :tag "Multiline Prompt")
+ )
+ )
(make-variable-buffer-local 'dirtrack-list)
-(defvar dirtrack-debug nil
- "*If non-nil, the function 'dirtrack' will report debugging info.")
+(defcustom dirtrack-debug nil
+ "*If non-nil, the function `dirtrack' will report debugging info."
+ :group 'dirtrack
+ :type 'boolean
+ )
-(defvar dirtrack-debug-buffer "*Directory Tracking Log*"
- "Buffer to write directory tracking debug information.")
+(defcustom dirtrack-debug-buffer "*Directory Tracking Log*"
+ "Buffer to write directory tracking debug information."
+ :group 'dirtrack
+ :type 'string
+ )
-(defvar dirtrackp t
- "*If non-nil, directory tracking via 'dirtrack' is enabled.")
+(defcustom dirtrackp t
+ "*If non-nil, directory tracking via `dirtrack' is enabled."
+ :group 'dirtrack
+ :type 'boolean
+ )
(make-variable-buffer-local 'dirtrackp)
-(defvar 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.")
+ "*Function to apply to the prompt directory for comparison purposes."
+ :group 'dirtrack
+ :type 'function
+ )
-(defvar 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.")
+ "*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-default-directory-function (dir)
"Return a canonical directory for comparison purposes.
(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 (replace-slash directory t)))
+ (setq directory (downcase (dirtrack-replace-slash directory t)))
(if (not (char-equal ?/ (string-to-char (substring directory -1))))
(concat directory "/")
directory)))
-(defconst forward-slash (regexp-quote "/"))
-(defconst backward-slash (regexp-quote "\\"))
+(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 replace-slash (string &optional opposite)
+(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 backward-slash forward-slash))
- (replace (if opposite forward-slash backward-slash))
+ (let ((orig (if opposite
+ dirtrack-backward-slash
+ dirtrack-forward-slash))
+ (replace (if opposite
+ dirtrack-forward-slash
+ dirtrack-backward-slash))
(newstring string)
)
(while (string-match orig newstring)
(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))
)
(set-buffer debug-buf)
+ (goto-char (point-max))
(insert (concat string "\n"))
(set-buffer buf)
))
;;;###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))
+ (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 comint-last-output-start)
- ;; Look for the prompt
- (if multi-line
- (and
- (goto-char (point-max))
- (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")))
- ;; Change directory
- (shell-process-cd prompt-path)
- (and dirtrack-debug
- (dirtrack-debug-message
- (format "Changing directory to %s" prompt-path))))
- )))))))
+ ;; 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
+ (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
HCoop / bpt / emacs.git / blobdiff