295 lines
14 KiB
EmacsLisp
295 lines
14 KiB
EmacsLisp
;;; diminish.el --- Diminished modes are minor modes with no modeline display
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;; Copyright (C) 1998 Free Software Foundation, Inc.
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;; Author: Will Mengarini <seldon@eskimo.com>
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;; Maintainer: Martin Yrjölä <martin.yrjola@gmail.com>
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;; URL: https://github.com/myrjola/diminish.el
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;; Package-Version: 20220104.1539
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;; Package-Commit: 6b7e837b0cf0129e9d7d6abae48093cf599bb9e8
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;; Created: Th 19 Feb 98
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;; Version: 0.46
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;; Package-Requires: ((emacs "24.3"))
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;; Keywords: extensions, diminish, minor, codeprose
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;; This program 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 3 of the License, or
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;; (at your option) any later version.
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;; This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Minor modes each put a word on the mode line to signify that they're
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;; active. This can cause other displays, such as % of file that point is
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;; at, to run off the right side of the screen. For some minor modes, such
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;; as mouse-avoidance-mode, the display is a waste of space, since users
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;; typically set the mode in their .emacs & never change it. For other
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;; modes, such as my jiggle-mode, it's a waste because there's already a
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;; visual indication of whether the mode is in effect.
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;; A diminished mode is a minor mode that has had its mode line
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;; display diminished, usually to nothing, although diminishing to a
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;; shorter word or a single letter is also supported. This package
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;; implements diminished modes.
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;; You can use this package either interactively or from your .emacs file.
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;; In either case, first you'll need to copy this file to a directory that
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;; appears in your load-path. `load-path' is the name of a variable that
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;; contains a list of directories Emacs searches for files to load.
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;; To prepend another directory to load-path, put a line like
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;; (add-to-list 'load-path "c:/My_Directory") in your .emacs file.
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;; To create diminished modes interactively, type
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;; M-x load-library
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;; to get a prompt like
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;; Load library:
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;; and respond `diminish' (unquoted). Then type
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;; M-x diminish
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;; to get a prompt like
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;; Diminish what minor mode:
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;; and respond with the name of some minor mode, like mouse-avoidance-mode.
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;; You'll then get this prompt:
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;; To what mode-line display:
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;; Respond by just hitting <Enter> if you want the name of the mode
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;; completely removed from the mode line. If you prefer, you can abbreviate
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;; the name. If your abbreviation is 2 characters or more, such as "Av",
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;; it'll be displayed as a separate word on the mode line, just like minor
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;; modes' names. If it's a single character, such as "V", it'll be scrunched
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;; up against the previous word, so for example if the undiminished mode line
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;; display had been "Abbrev Fill Avoid", it would become "Abbrev FillV".
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;; Multiple single-letter diminished modes will all be scrunched together.
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;; The display of undiminished modes will not be affected.
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;; To find out what the mode line would look like if all diminished modes
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;; were still minor, type M-x diminished-modes. This displays in the echo
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;; area the complete list of minor or diminished modes now active, but
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;; displays them all as minor. They remain diminished on the mode line.
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;; To convert a diminished mode back to a minor mode, type M-x diminish-undo
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;; to get a prompt like
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;; Restore what diminished mode:
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;; Respond with the name of some diminished mode. To convert all
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;; diminished modes back to minor modes, respond to that prompt
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;; with `diminished-modes' (unquoted, & note the hyphen).
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;; When you're responding to the prompts for mode names, you can use
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;; completion to avoid extra typing; for example, m o u SPC SPC SPC
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;; is usually enough to specify mouse-avoidance-mode. Mode names
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;; typically end in "-mode", but for historical reasons
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;; auto-fill-mode is named by "auto-fill-function".
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;; To create diminished modes noninteractively in your .emacs file, put
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;; code like
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;; (require 'diminish)
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;; (diminish 'abbrev-mode "Abv")
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;; (diminish 'jiggle-mode)
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;; (diminish 'mouse-avoidance-mode "M")
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;; near the end of your .emacs file. It should be near the end so that any
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;; minor modes your .emacs loads will already have been loaded by the time
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;; they're to be converted to diminished modes.
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;; To diminish a major mode, (setq mode-name "whatever") in the mode hook.
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;;; Epigraph:
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;; "The quality of our thoughts is bordered on all sides
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;; by our facility with language."
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;; --J. Michael Straczynski
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;;; Code:
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(eval-when-compile (require 'cl-lib))
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(defvar diminish-must-not-copy-minor-mode-alist nil
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"Non-nil means loading diminish.el won't (copy-alist minor-mode-alist).
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Normally `minor-mode-alist' is setq to that copy on loading diminish because
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at least one of its cons cells, that for abbrev-mode, is read-only (see
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ELisp Info on \"pure storage\"). If you setq this variable to t & then
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try to diminish abbrev-mode under GNU Emacs 19.34, you'll get the error
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message \"Attempt to modify read-only object\".")
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(or diminish-must-not-copy-minor-mode-alist
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(cl-callf copy-alist minor-mode-alist))
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(defvar diminished-mode-alist nil
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"The original `minor-mode-alist' value of all (diminish)ed modes.")
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(defvar diminish-history-symbols nil
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"Command history for symbols of diminished modes.")
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(defvar diminish-history-names nil
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"Command history for names of diminished modes.")
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;; When we diminish a mode, we are saying we want it to continue doing its
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;; work for us, but we no longer want to be reminded of it. It becomes a
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;; night worker, like a janitor; it becomes an invisible man; it remains a
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;; component, perhaps an important one, sometimes an indispensable one, of
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;; the mechanism that maintains the day-people's world, but its place in
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;; their thoughts is diminished, usually to nothing. As we grow old we
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;; diminish more and more such thoughts, such people, usually to nothing.
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;; "The wise man knows that to keep under is to endure." The diminished
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;; often come to value their invisibility. We speak--speak--of "the strong
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;; silent type", but only as a superficiality; a stereotype in a movie,
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;; perhaps, but even if an acquaintance, necessarily, by hypothesis, a
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;; distant one. The strong silent type is actually a process. It begins
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;; with introspection, continues with judgment, and is shaped by the
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;; discovery that these judgments are impractical to share; there is no
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;; appetite for the wisdom of the self-critical among the creatures of
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;; material appetite who dominate our world. Their dominance's Darwinian
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;; implications reinforce the self-doubt that is the germ of higher wisdom.
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;; The thoughtful contemplate the evolutionary triumph of the predator.
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;; Gnostics deny the cosmos could be so evil; this must all be a prank; the
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;; thoughtful remain silent, invisible, self-diminished, and discover,
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;; perhaps at first in surprise, the freedom they thus gain, and grow strong.
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;;;###autoload
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(defun diminish (mode &optional to-what)
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"Diminish mode-line display of minor mode MODE to TO-WHAT (default \"\").
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Interactively, enter (with completion) the name of any minor mode, followed
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on the next line by what you want it diminished to (default empty string).
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The response to neither prompt should be quoted. However, in Lisp code,
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both args must be quoted, the first as a symbol, the second as a string,
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as in (diminish 'jiggle-mode \" Jgl\").
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The mode-line displays of minor modes usually begin with a space, so
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the modes' names appear as separate words on the mode line. However, if
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you're having problems with a cramped mode line, you may choose to use single
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letters for some modes, without leading spaces. Capitalizing them works
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best; if you then diminish some mode to \"X\" but have `abbrev-mode' enabled as
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well, you'll get a display like \"AbbrevX\". This function prepends a space
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to TO-WHAT if it's > 1 char long & doesn't already begin with a space."
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(interactive (list (read (completing-read
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"Diminish what minor mode: "
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(mapcar (lambda (x) (list (symbol-name (car x))))
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minor-mode-alist)
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nil t nil 'diminish-history-symbols))
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(read-from-minibuffer
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"To what mode-line display: "
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nil nil nil 'diminish-history-names)))
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(let ((minor (assq mode minor-mode-alist)))
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(when minor
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(progn (cl-callf or to-what "")
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(when (and (stringp to-what)
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(> (length to-what) 1))
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(or (= (string-to-char to-what) ?\ )
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(cl-callf2 concat " " to-what)))
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(or (assq mode diminished-mode-alist)
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(push (copy-sequence minor) diminished-mode-alist))
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(setcdr minor (list to-what))))))
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;; But an image comes to me, vivid in its unreality, of a loon alone on his
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;; forest lake, shrieking his soul out into a canopy of stars. Alone this
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;; afternoon in my warm city apartment, I can feel the bite of his night air,
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;; and smell his conifers. In him there is no acceptance of diminishment.
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;; "I have a benevolent habit of pouring out myself to everybody,
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;; and would even pay for a listener, and I am afraid
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;; that the Athenians may think me too talkative."
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;; --Socrates, in the /Euthyphro/
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;; I remember a news story about a retired plumber who had somehow managed to
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;; steal a military tank. He rode it down city streets, rode over a parked
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;; car--no one was hurt--rode onto a freeway, that concrete symbol of the
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;; American spirit, or so we fancy it, shouting "Plumber Bob! Plumber Bob!".
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;; He was shot dead by police.
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;;;###autoload
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(defun diminish-undo (mode)
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"Restore mode-line display of diminished mode MODE to its minor-mode value.
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Do nothing if the arg is a minor mode that hasn't been diminished.
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Interactively, enter (with completion) the name of any diminished mode (a
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mode that was formerly a minor mode on which you invoked \\[diminish]).
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To restore all diminished modes to minor status, answer `diminished-modes'.
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The response to the prompt shouldn't be quoted. However, in Lisp code,
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the arg must be quoted as a symbol, as in (diminish-undo 'diminished-modes)."
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(interactive
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(list (read (completing-read
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"Restore what diminished mode: "
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(cons (list "diminished-modes")
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(mapcar (lambda (x) (list (symbol-name (car x))))
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diminished-mode-alist))
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nil t nil 'diminish-history-symbols))))
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(if (eq mode 'diminished-modes)
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(let ((diminished-modes diminished-mode-alist))
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(while diminished-modes
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(diminish-undo (caar diminished-modes))
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(cl-callf cdr diminished-modes)))
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(let ((minor (assq mode minor-mode-alist))
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(diminished (assq mode diminished-mode-alist)))
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(or minor
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(error "%S is not currently registered as a minor mode" mode))
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(when diminished
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(setcdr minor (cdr diminished))))))
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;; Plumber Bob was not from Seattle, my grey city, for rainy Seattle is a
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;; city of interiors, a city of the self-diminished. When I moved here one
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;; sunny June I was delighted to find that ducks and geese were common in
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;; the streets. But I hoped to find a loon or two, and all I found were
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;; ducks and geese. I wondered about this; I wondered why there were no
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;; loons in Seattle; but my confusion resulted from my ignorance of the
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;; psychology of rain, which is to say my ignorance of diminished modes.
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;; What I needed, and lacked, was a way to discover they were there.
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;;;###autoload
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(defun diminished-modes ()
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"Echo all active diminished or minor modes as if they were minor.
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The display goes in the echo area; if it's too long even for that,
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you can see the whole thing in the *Messages* buffer.
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This doesn't change the status of any modes; it just lets you see
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what diminished modes would be on the mode-line if they were still minor."
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(interactive)
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(let ((minor-modes minor-mode-alist)
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message)
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(while minor-modes
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(when (symbol-value (caar minor-modes))
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;; This minor mode is active in this buffer
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(let* ((mode-pair (car minor-modes))
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(mode (car mode-pair))
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(minor-pair (or (assq mode diminished-mode-alist) mode-pair))
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(minor-name (cadr minor-pair)))
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(when (symbolp minor-name)
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;; This minor mode uses symbol indirection in the cdr
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(let ((symbols-seen (list minor-name)))
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(while (and (symbolp (cl-callf symbol-value minor-name))
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(not (memq minor-name symbols-seen)))
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(push minor-name symbols-seen))))
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(push minor-name message)))
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(cl-callf cdr minor-modes))
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(setq message (mapconcat 'identity (nreverse message) ""))
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(when (= (string-to-char message) ?\ )
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(cl-callf substring message 1))
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(message "%s" message)))
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;; A human mind is a Black Forest of diminished modes. Some are dangerous;
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;; most of the mind of an intimate is a secret stranger, and these diminished
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;; modes are rendered more unpredictable by their long isolation from the
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;; corrective influence of interaction with reality. The student of history
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;; learns that this description applies to whole societies as well. In some
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;; ways the self-diminished are better able to discern the night worker.
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;; They are rendered safer by their heightened awareness of others'
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;; diminished modes, and more congenial by the spare blandness of their own
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;; mode lines. To some people rain is truly depressing, but others it just
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;; makes pensive, and, forcing them indoors where they may not have the
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;; luxury of solitude, teaches them to self-diminish. That was what I had
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;; not understood when I was searching for loons among the ducks and geese.
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;; Loons come to Seattle all the time, but the ones that like it learn to be
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;; silent, learn to self-diminish, and take on the colors of ducks and geese.
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;; Now, here a dozen years, I can recognize them everywhere, standing quietly
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;; in line with the ducks and geese at the espresso counter, gazing placidly
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;; out on the world through loon-red eyes, thinking secret thoughts.
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(provide 'diminish)
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;;; diminish.el ends here
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