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328 lines
11 KiB
EmacsLisp
328 lines
11 KiB
EmacsLisp
;;; dirtrack.el --- Directory Tracking by watching the prompt
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;; Copyright (C) 1996 Free Software Foundation, Inc.
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;; Author: Peter Breton <pbreton@cs.umb.edu>
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;; Created: Sun Nov 17 1996
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;; Keywords: processes
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;; Time-stamp: <1998-03-14 09:24:38 pbreton>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Shell directory tracking by watching the prompt.
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;;
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;; This is yet another attempt at a directory-tracking package for
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;; Emacs shell-mode. However, this package makes one strong assumption:
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;; that you can customize your shell's prompt to contain the
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;; current working directory. Most shells do support this, including
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;; almost every type of Bourne and C shell on Unix, the native shells on
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;; Windows95 (COMMAND.COM) and Windows NT (CMD.EXE), and most 3rd party
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;; Windows shells. If you cannot do this, or do not wish to, this package
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;; will be useless to you.
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;;
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;; Installation:
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;;
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;; 1) Set your shell's prompt to contain the current working directory.
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;; You may need to consult your shell's documentation to find out how to
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;; do this.
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;;
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;; Note that directory tracking is done by matching regular expressions,
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;; therefore it is *VERY IMPORTANT* for your prompt to be easily
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;; distinguishable from other output. If your prompt regexp is too general,
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;; you will see error messages from the dirtrack filter as it attempts to cd
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;; to non-existent directories.
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;;
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;; 2) Set the variable `dirtrack-list' to an appropriate value. This
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;; should be a list of two elements: the first is a regular expression
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;; which matches your prompt up to and including the pathname part.
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;; The second is a number which tells which regular expression group to
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;; match to extract only the pathname. If you use a multi-line prompt,
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;; add 't' as a third element. Note that some of the functions in
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;; 'comint.el' assume a single-line prompt (eg, comint-bol).
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;;
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;; Determining this information may take some experimentation. Setting
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;; the variable `dirtrack-debug' may help; it causes the directory-tracking
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;; filter to log messages to the buffer `dirtrack-debug-buffer'. You can easily
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;; toggle this setting with the `dirtrack-debug-toggle' function.
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;;
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;; 3) Add a hook to shell-mode to enable the directory tracking:
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;;
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;; (add-hook 'shell-mode-hook
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;; (function (lambda ()
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;; (setq comint-output-filter-functions
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;; (append (list 'dirtrack)
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;; comint-output-filter-functions)))))
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;;
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;; You may wish to turn ordinary shell tracking off by calling
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;; `shell-dirtrack-toggle' or setting `shell-dirtrackp'.
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;;
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;; Examples:
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;;
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;; 1) On Windows NT, my prompt is set to emacs$S$P$G.
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;; 'dirtrack-list' is set to (list "^emacs \\([a-zA-Z]:.*\\)>" 1)
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;;
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;; 2) On Solaris running bash, my prompt is set like this:
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;; PS1="\w\012emacs@\h(\!) [\t]% "
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;; 'dirtrack-list' is set to (list "^\\([/~].*\\)\nemacs@[^%]+% *" 1 t)
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;;
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;; I'd appreciate other examples from people who use this package.
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;;
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;; Here's one from Stephen Eglen:
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;;
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;; Running under tcsh:
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;; (setq-default dirtrack-list '("^%E \\([^ ]+\\)" 1))
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;;
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;; It might be worth mentioning in your file that emacs sources start up
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;; files of the form: ~/.emacs_<SHELL> where <SHELL> is the name of the
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;; shell. So for example, I have the following in ~/.emacs_tcsh:
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;;
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;; set prompt = "%%E %~ %h% "
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;;
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;; This produces a prompt of the form:
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;; %E /var/spool 10%
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;;
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;; This saves me from having to use the %E prefix in other non-emacs
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;; shells.
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;;
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;; A final note:
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;;
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;; I run LOTS of shell buffers through Emacs, sometimes as different users (eg, when
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;; logged in as myself, I'll run a root shell in the same Emacs). If you do this, and
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;; the shell prompt contains a ~, Emacs will interpret this relative to the user which
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;; owns the Emacs process, not the user who owns the shell buffer. This may cause
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;; dirtrack to behave strangely (typically it reports that it is unable to cd to a directory
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;; with a ~ in it).
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;;
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;; The same behavior can occur if you use dirtrack with remote filesystems (using telnet,
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;; rlogin, etc) as Emacs will be checking the local filesystem, not the remote one.
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;; This problem is not specific to dirtrack, but also affects file completion, etc.
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;;; Code:
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(eval-when-compile
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(require 'comint)
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(require 'shell))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Customization Variables
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defgroup dirtrack nil
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"Directory tracking by watching the prompt."
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:prefix "dirtrack-"
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:group 'shell)
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(defcustom dirtrack-list (list "^emacs \\([a-zA-Z]:.*\\)>" 1)
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"*List for directory tracking.
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First item is a regexp that describes where to find the path in a prompt.
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Second is a number, the regexp group to match. Optional third item is
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whether the prompt is multi-line. If nil or omitted, prompt is assumed to
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be on a single line."
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:group 'dirtrack
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:type '(sexp (regexp :tag "Prompt Expression")
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(integer :tag "Regexp Group")
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(boolean :tag "Multiline Prompt")
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)
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)
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(make-variable-buffer-local 'dirtrack-list)
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(defcustom dirtrack-debug nil
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"*If non-nil, the function `dirtrack' will report debugging info."
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:group 'dirtrack
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:type 'boolean
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)
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(defcustom dirtrack-debug-buffer "*Directory Tracking Log*"
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"Buffer to write directory tracking debug information."
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:group 'dirtrack
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:type 'string
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)
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(defcustom dirtrackp t
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"*If non-nil, directory tracking via `dirtrack' is enabled."
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:group 'dirtrack
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:type 'boolean
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)
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(make-variable-buffer-local 'dirtrackp)
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(defcustom dirtrack-directory-function
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(if (memq system-type (list 'ms-dos 'windows-nt))
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'dirtrack-windows-directory-function
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'dirtrack-default-directory-function)
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"*Function to apply to the prompt directory for comparison purposes."
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:group 'dirtrack
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:type 'function
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)
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(defcustom dirtrack-canonicalize-function
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(if (memq system-type (list 'ms-dos 'windows-nt))
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'downcase 'identity)
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"*Function to apply to the default directory for comparison purposes."
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:group 'dirtrack
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:type 'function
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)
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(defcustom dirtrack-directory-change-hook nil
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"Hook that is called when a directory change is made."
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:group 'dirtrack
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:type 'function
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)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Functions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defun dirtrack-default-directory-function (dir)
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"Return a canonical directory for comparison purposes.
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Such a directory ends with a forward slash."
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(let ((directory dir))
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(if (not (char-equal ?/ (string-to-char (substring directory -1))))
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(concat directory "/")
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directory)))
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(defun dirtrack-windows-directory-function (dir)
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"Return a canonical directory for comparison purposes.
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Such a directory is all lowercase, has forward-slashes as delimiters,
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and ends with a forward slash."
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(let ((directory dir))
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(setq directory (downcase (dirtrack-replace-slash directory t)))
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(if (not (char-equal ?/ (string-to-char (substring directory -1))))
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(concat directory "/")
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directory)))
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(defconst dirtrack-forward-slash (regexp-quote "/"))
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(defconst dirtrack-backward-slash (regexp-quote "\\"))
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(defun dirtrack-replace-slash (string &optional opposite)
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"Replace forward slashes with backwards ones.
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If additional argument is non-nil, replace backwards slashes with
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forward ones."
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(let ((orig (if opposite
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dirtrack-backward-slash
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dirtrack-forward-slash))
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(replace (if opposite
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dirtrack-forward-slash
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dirtrack-backward-slash))
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(newstring string)
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)
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(while (string-match orig newstring)
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(setq newstring (replace-match replace nil t newstring)))
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newstring))
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;; Copied from shell.el
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(defun dirtrack-toggle ()
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"Enable or disable Dirtrack directory tracking in a shell buffer."
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(interactive)
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(setq dirtrackp (not dirtrackp))
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(message "Directory tracking %s" (if dirtrackp "ON" "OFF")))
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(defun dirtrack-debug-toggle ()
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"Enable or disable Dirtrack debugging."
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(interactive)
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(setq dirtrack-debug (not dirtrack-debug))
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(message "Directory debugging %s" (if dirtrack-debug "ON" "OFF"))
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(and dirtrack-debug
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(display-buffer (get-buffer-create dirtrack-debug-buffer))))
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(defun dirtrack-debug-message (string)
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(let ((buf (current-buffer))
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(debug-buf (get-buffer-create dirtrack-debug-buffer))
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)
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(set-buffer debug-buf)
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(goto-char (point-max))
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(insert (concat string "\n"))
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(set-buffer buf)
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))
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;;;###autoload
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(defun dirtrack (input)
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(if (null dirtrackp)
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nil
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(let ((prompt-path)
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(current-dir default-directory)
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(matched)
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(dirtrack-regexp (nth 0 dirtrack-list))
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(match-num (nth 1 dirtrack-list))
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(multi-line (nth 2 dirtrack-list))
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)
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;; No output?
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(if (eq (point) (point-min))
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nil
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(save-excursion
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(goto-char (point-max))
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;; Look for the prompt
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(if multi-line
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(setq matched
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(re-search-backward
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dirtrack-regexp
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comint-last-output-start
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t))
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(beginning-of-line)
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(setq matched (looking-at dirtrack-regexp)))
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;; No match
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(if (null matched)
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(and dirtrack-debug
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(dirtrack-debug-message
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(format
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"Input `%s' failed to match regexp: %s"
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input dirtrack-regexp)))
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(setq prompt-path
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(buffer-substring-no-properties
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(match-beginning match-num) (match-end match-num)))
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;; Empty string
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(if (not (> (length prompt-path) 0))
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(and dirtrack-debug
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(dirtrack-debug-message "Match is empty string"))
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;; Transform prompts into canonical forms
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(setq prompt-path (funcall dirtrack-directory-function
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prompt-path))
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(setq current-dir (funcall dirtrack-canonicalize-function
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current-dir))
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(and dirtrack-debug
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(dirtrack-debug-message
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(format
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"Prompt is %s\nCurrent directory is %s"
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prompt-path current-dir)))
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;; Compare them
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(if (or (string= current-dir prompt-path)
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(string= current-dir
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(abbreviate-file-name prompt-path)))
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(and dirtrack-debug
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(dirtrack-debug-message
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(format "Not changing directory")))
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;; It's possible that Emacs will think the directory
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;; won't exist (eg, rlogin buffers)
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(if (file-accessible-directory-p prompt-path)
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;; Change directory
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(and (shell-process-cd prompt-path)
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(run-hooks dirtrack-directory-change-hook)
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dirtrack-debug
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(dirtrack-debug-message
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(format "Changing directory to %s" prompt-path)))
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(error "Directory %s does not exist" prompt-path)))
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)))))))
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(provide 'dirtrack)
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;;; dirtrack.el ends here
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