Commit 519f7ff6 authored by Miles Bader's avatar Miles Bader
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Initial checkin.

parent c165ad40
;;; rfn-eshadow.el --- Highlight `shadowed' part of read-file-name input text
;;
;; Copyright (C) 2000, 2001 Free Software Foundation, Inc.
;;
;; Author: Miles Bader <miles@gnu.org>
;; Keywords: convenience
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; 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.
;;; Commentary:
;;
;; Defines the mode `read-file-name-electric-shadow-mode'.
;;
;; The `read-file-name' function passes its result through
;; `substitute-in-file-name', so any part of the string preceding
;; multiple slashes (or a drive indicator on MS-DOS/MS-Windows) is
;; ignored.
;;
;; If `read-file-name-electric-shadow-mode' is active, any part of the
;; minibuffer text that would be ignored because of this is given the
;; properties in `read-file-name-electric-shadow-properties', which may
;; be used to make the ignored text invisible, dim, etc.
;;
;;; Code:
;;; Customization
(defconst read-file-name-electric-shadow-properties-custom-type
'(list
(checklist :inline t
(const :tag "Invisible"
:doc "Make shadowed part of filename invisible"
:format "%t%n%h"
:inline t
(invisible t intangible t))
(list :inline t
:format "%v"
:tag "Face"
:doc "Display shadowed part of filename using a different face"
(const :format "" face)
(face :value read-file-name-electric-shadow))
(list :inline t
:format "%t: %v%h"
:tag "Brackets"
;; Note the 4 leading spaces in the doc string;
;; this is hack to get around the fact that the
;; newline after the second string widget comes
;; from the string widget, and doesn't indent
;; correctly. We could use a :size attribute to
;; make the second string widget not have a
;; terminating newline, but this makes it impossible
;; to enter trailing whitespace, and it's desirable
;; that it be possible.
:doc " Surround shadowed part of filename with brackets"
(const :format "" before-string)
(string :format "%v" :size 4 :value "{")
(const :format "" after-string)
;; see above about why the 2nd string doesn't use :size
(string :format " and: %v" :value "} "))
(list :inline t
:format "%t: %v%n%h"
:tag "String"
:doc "Display a string instead of the shadowed part of filename"
(const :format "" display)
(string :format "%v" :size 15 :value "<...ignored...>"))
(const :tag "Avoid"
:doc "Try to keep cursor out of shadowed part of filename"
:format "%t%n%h"
:inline t
(field shadow)))
(repeat :inline t
:tag "Other Properties"
(list :inline t
:format "%v"
(symbol :tag "Property")
(sexp :tag "Value")))))
(defcustom read-file-name-electric-shadow-properties
'(face read-file-name-electric-shadow field shadow)
"Properties given to the `shadowed' part of a filename in the minibuffer.
Only used when `read-file-name-electric-shadow-mode' is active.
If emacs is not running under a window system,
`read-file-name-electric-shadow-tty-properties' is used instead."
:type read-file-name-electric-shadow-properties-custom-type
:group 'minibuffer)
(defcustom read-file-name-electric-shadow-tty-properties
'(before-string "{" after-string "} " field shadow)
"Properties given to the `shadowed' part of a filename in the minibuffer.
Only used when `read-file-name-electric-shadow-mode' is active and emacs
is not running under a window-system; if emacs is running under a window
system, `read-file-name-electric-shadow-properties' is used instead."
:type read-file-name-electric-shadow-properties-custom-type
:group 'minibuffer)
(defface read-file-name-electric-shadow
'((((background dark))
:foreground "grey50")
(t
:foreground "grey70"))
"Face used by `read-file-name-electric-shadow-mode' for the shadow."
:group 'minibuffer)
;;; Internal variables
;; Regexp to locate dividing point between shadow and real pathname
(defconst rfn-eshadow-regexp
(cond ((memq system-type '(ms-dos windows-nt))
;; This horrible regexp considers the following patterns as
;; starting an absolute pathname, when following a `/' or an `\':
;; L: / // ~ $ \\ \\\\
"\\(.*[^/]+/+?\\|/*?\\|\\)\\([$~]\\|[][\\^a-z]:\\|//?\\([^][\\^a-z/$~]\\|[^/$~][^:]\\|[^/$~]?\\'\\)\\)")
(t
;; default is for unix-style filenames
"\\(.*/\\)[/$~]"))
"Regular expression used to match shadowed filenames.
There should be at least one regexp group; the end of the first one
is used as the end of the shadowed portion of the filename.")
;; A list of minibuffers to which we've added a post-command-hook.
(defvar rfn-eshadow-frobbed-minibufs nil)
;; An overlay covering the shadowed part of the filename (local to the
;; minibuffer).
(defvar rfn-eshadow-overlay)
(make-variable-buffer-local 'rfn-eshadow-overlay)
;;; Hook functions
;; This function goes on minibuffer-setup-hook
(defun rfn-eshadow-setup-minibuffer ()
"Set up a minibuffer for `read-file-name-electric-shadow-mode'.
The prompt and initial input should already have been inserted."
(when minibuffer-completing-file-name
(setq rfn-eshadow-overlay
(make-overlay (minibuffer-prompt-end) (minibuffer-prompt-end)))
;; Give rfn-eshadow-overlay the user's props.
(let ((props
(if window-system
read-file-name-electric-shadow-properties
read-file-name-electric-shadow-tty-properties)))
(while props
(overlay-put rfn-eshadow-overlay (pop props) (pop props))))
;; Turn on overlay evaporation so that we don't have to worry about
;; odd effects when the overlay sits empty at the beginning of the
;; minibuffer.
(overlay-put rfn-eshadow-overlay 'evaporate t)
;; Add our post-command hook, and make sure can remove it later.
(add-to-list 'rfn-eshadow-frobbed-minibufs (current-buffer))
(add-hook 'post-command-hook #'rfn-eshadow-update-overlay nil t)))
;; post-command-hook to update overlay
(defun rfn-eshadow-update-overlay ()
"Update `rfn-eshadow-overlay' to cover shadowed part of minibuffer input.
This is intended to be used as a minibuffer post-command-hook for
`read-file-name-electric-shadow-mode'; the minibuffer should have already
been set up by `rfn-eshadow-setup-minibuffer'."
;; This is not really a correct implementation; it won't always do the
;; right thing in the presence of environment variables that
;; substitute-in-file-name would expand; currently it just assumes any
;; environment variable contains an absolute filename. It doesn't
;; handle MS-DOS-type drive specs like substitute-in-file-name does.
(save-excursion
;; Note that this should use `minibuffer-prompt-end' instead of
;; `field-end', but for now we use the latter so that it works
;; properly with old definitions of minibuffer-prompt-end.
(goto-char (field-end (point-min)))
;; Update the overlay (which will evaporate if it's empty).
(move-overlay rfn-eshadow-overlay
(point)
(if (looking-at rfn-eshadow-regexp)
(match-end 1)
(point)))))
;;; Note this definition must be at the end of the file, because
;;; `define-minor-mode' actually calls the mode-function if the
;;; associated variable is non-nil, which requires that all needed
;;; functions be already defined. [This is arguably a bug in d-m-m]
;;;###autoload
(define-minor-mode read-file-name-electric-shadow-mode
"Toggle Read-File-Name Electric Shadow mode
When active, any part of the a filename being read in the minibuffer
that would be ignored because the result is passed through
`substitute-in-file-name' is given the properties in
`read-file-name-electric-shadow-properties', which can be used to make
that portion dim, invisible, or otherwise less visually noticable.
With prefix argument ARG, turn on if positive, otherwise off.
Returns non-nil if the new state is enabled."
:global t
:group 'minibuffer
(if read-file-name-electric-shadow-mode
;; Enable the mode
(add-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer)
;; Disable the mode
(remove-hook 'minibuffer-setup-hook 'rfn-eshadow-setup-minibuffer)
;; Remove our entry from any post-command-hook variable's it's still in
(dolist (minibuf rfn-eshadow-frobbed-minibufs)
(with-current-buffer minibuf
(remove-hook 'post-command-hook #'rfn-eshadow-update-overlay t)))
(setq rfn-eshadow-frobbed-minibufs nil)))
(provide 'rfn-eshadow)
;;; rfn-eshadow.el ends here
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