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+;;; diminish.el --- Diminished modes are minor modes with no modeline display
+
+;; Copyright (C) 1998 Free Software Foundation, Inc.
+
+;; Author: Will Mengarini <seldon@eskimo.com>
+;; Maintainer: Martin Yrjölä <martin.yrjola@gmail.com>
+;; URL: <https://github.com/myrjola/diminish.el>
+;; Package-Version: 20170419.1036
+;; Created: Th 19 Feb 98
+;; Version: 0.45
+;; Keywords: extensions, diminish, minor, codeprose
+
+;; This program 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.
+
+;; This program 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
+;; this program; see the file LICENSE. If not, write to the write to the Free
+;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+;; 02110-1301, USA.
+
+;;; Commentary:
+
+;; Minor modes each put a word on the mode line to signify that they're
+;; active.  This can cause other displays, such as % of file that point is
+;; at, to run off the right side of the screen.  For some minor modes, such
+;; as mouse-avoidance-mode, the display is a waste of space, since users
+;; typically set the mode in their .emacs & never change it.  For other
+;; modes, such as my jiggle-mode, it's a waste because there's already a
+;; visual indication of whether the mode is in effect.
+
+;; A diminished mode is a minor mode that has had its mode line
+;; display diminished, usually to nothing, although diminishing to a
+;; shorter word or a single letter is also supported.  This package
+;; implements diminished modes.
+
+;; You can use this package either interactively or from your .emacs file.
+;; In either case, first you'll need to copy this file to a directory that
+;; appears in your load-path.  `load-path' is the name of a variable that
+;; contains a list of directories Emacs searches for files to load.
+;; To prepend another directory to load-path, put a line like
+;; (add-to-list 'load-path "c:/My_Directory") in your .emacs file.
+
+;; To create diminished modes interactively, type
+;;   M-x load-library
+;; to get a prompt like
+;;   Load library:
+;; and respond `diminish' (unquoted).  Then type
+;;   M-x diminish
+;; to get a prompt like
+;;   Diminish what minor mode:
+;; and respond with the name of some minor mode, like mouse-avoidance-mode.
+;; You'll then get this prompt:
+;;   To what mode-line display:
+;; Respond by just hitting <Enter> if you want the name of the mode
+;; completely removed from the mode line.  If you prefer, you can abbreviate
+;; the name.  If your abbreviation is 2 characters or more, such as "Av",
+;; it'll be displayed as a separate word on the mode line, just like minor
+;; modes' names.  If it's a single character, such as "V", it'll be scrunched
+;; up against the previous word, so for example if the undiminished mode line
+;; display had been "Abbrev Fill Avoid", it would become "Abbrev FillV".
+;; Multiple single-letter diminished modes will all be scrunched together.
+;; The display of undiminished modes will not be affected.
+
+;; To find out what the mode line would look like if all diminished modes
+;; were still minor, type M-x diminished-modes.  This displays in the echo
+;; area the complete list of minor or diminished modes now active, but
+;; displays them all as minor.  They remain diminished on the mode line.
+
+;; To convert a diminished mode back to a minor mode, type M-x diminish-undo
+;; to get a prompt like
+;;   Restore what diminished mode:
+;; Respond with the name of some diminished mode.  To convert all
+;; diminished modes back to minor modes, respond to that prompt
+;; with `diminished-modes' (unquoted, & note the hyphen).
+
+;; When you're responding to the prompts for mode names, you can use
+;; completion to avoid extra typing; for example, m o u SPC SPC SPC
+;; is usually enough to specify mouse-avoidance-mode.  Mode names
+;; typically end in "-mode", but for historical reasons
+;; auto-fill-mode is named by "auto-fill-function".
+
+;; To create diminished modes noninteractively in your .emacs file, put
+;; code like
+;;   (require 'diminish)
+;;   (diminish 'abbrev-mode "Abv")
+;;   (diminish 'jiggle-mode)
+;;   (diminish 'mouse-avoidance-mode "M")
+;; near the end of your .emacs file.  It should be near the end so that any
+;; minor modes your .emacs loads will already have been loaded by the time
+;; they're to be converted to diminished modes.
+
+;; To diminish a major mode, (setq mode-name "whatever") in the mode hook.
+
+;;; Epigraph:
+
+;;         "The quality of our thoughts is bordered on all sides
+;;          by our facility with language."
+;;               --J. Michael Straczynski
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(defvar diminish-must-not-copy-minor-mode-alist nil
+  "Non-nil means loading diminish.el won't (copy-alist minor-mode-alist).
+Normally `minor-mode-alist' is setq to that copy on loading diminish because
+at least one of its cons cells, that for abbrev-mode, is read-only (see
+ELisp Info on \"pure storage\").  If you setq this variable to t & then
+try to diminish abbrev-mode under GNU Emacs 19.34, you'll get the error
+message \"Attempt to modify read-only object\".")
+
+(or diminish-must-not-copy-minor-mode-alist
+    (callf copy-alist minor-mode-alist))
+
+(defvar diminished-mode-alist nil
+  "The original `minor-mode-alist' value of all (diminish)ed modes.")
+
+(defvar diminish-history-symbols nil
+  "Command history for symbols of diminished modes.")
+
+(defvar diminish-history-names nil
+  "Command history for names of diminished modes.")
+
+;; When we diminish a mode, we are saying we want it to continue doing its
+;; work for us, but we no longer want to be reminded of it.  It becomes a
+;; night worker, like a janitor; it becomes an invisible man; it remains a
+;; component, perhaps an important one, sometimes an indispensable one, of
+;; the mechanism that maintains the day-people's world, but its place in
+;; their thoughts is diminished, usually to nothing.  As we grow old we
+;; diminish more and more such thoughts, such people, usually to nothing.
+
+;; "The wise man knows that to keep under is to endure."  The diminished
+;; often come to value their invisibility.  We speak--speak--of "the strong
+;; silent type", but only as a superficiality; a stereotype in a movie,
+;; perhaps, but even if an acquaintance, necessarily, by hypothesis, a
+;; distant one.  The strong silent type is actually a process.  It begins
+;; with introspection, continues with judgment, and is shaped by the
+;; discovery that these judgments are impractical to share; there is no
+;; appetite for the wisdom of the self-critical among the creatures of
+;; material appetite who dominate our world.  Their dominance's Darwinian
+;; implications reinforce the self-doubt that is the germ of higher wisdom.
+;; The thoughtful contemplate the evolutionary triumph of the predator.
+;; Gnostics deny the cosmos could be so evil; this must all be a prank; the
+;; thoughtful remain silent, invisible, self-diminished, and discover,
+;; perhaps at first in surprise, the freedom they thus gain, and grow strong.
+
+;;;###autoload
+(defun diminish (mode &optional to-what)
+  "Diminish mode-line display of minor mode MODE to TO-WHAT (default \"\").
+
+Interactively, enter (with completion) the name of any minor mode, followed
+on the next line by what you want it diminished to (default empty string).
+The response to neither prompt should be quoted.  However, in Lisp code,
+both args must be quoted, the first as a symbol, the second as a string,
+as in (diminish 'jiggle-mode \" Jgl\").
+
+The mode-line displays of minor modes usually begin with a space, so
+the modes' names appear as separate words on the mode line.  However, if
+you're having problems with a cramped mode line, you may choose to use single
+letters for some modes, without leading spaces.  Capitalizing them works
+best; if you then diminish some mode to \"X\" but have abbrev-mode enabled as
+well, you'll get a display like \"AbbrevX\".  This function prepends a space
+to TO-WHAT if it's > 1 char long & doesn't already begin with a space."
+  (interactive (list (read (completing-read
+                            "Diminish what minor mode: "
+                            (mapcar (lambda (x) (list (symbol-name (car x))))
+                                    minor-mode-alist)
+                            nil t nil 'diminish-history-symbols))
+                     (read-from-minibuffer
+                      "To what mode-line display: "
+                      nil nil nil 'diminish-history-names)))
+  (let ((minor (assq mode minor-mode-alist)))
+    (when minor
+        (progn (callf or to-what "")
+               (when (and (stringp to-what)
+                          (> (length to-what) 1))
+                 (or (= (string-to-char to-what) ?\ )
+                     (callf2 concat " " to-what)))
+               (or (assq mode diminished-mode-alist)
+                   (push (copy-sequence minor) diminished-mode-alist))
+               (setcdr minor (list to-what))))))
+
+;; But an image comes to me, vivid in its unreality, of a loon alone on his
+;; forest lake, shrieking his soul out into a canopy of stars.  Alone this
+;; afternoon in my warm city apartment, I can feel the bite of his night air,
+;; and smell his conifers.  In him there is no acceptance of diminishment.
+
+;; "I have a benevolent habit of pouring out myself to everybody,
+;;  and would even pay for a listener, and I am afraid
+;;  that the Athenians may think me too talkative."
+;;       --Socrates, in the /Euthyphro/
+
+;; I remember a news story about a retired plumber who had somehow managed to
+;; steal a military tank.  He rode it down city streets, rode over a parked
+;; car--no one was hurt--rode onto a freeway, that concrete symbol of the
+;; American spirit, or so we fancy it, shouting "Plumber Bob!  Plumber Bob!".
+;; He was shot dead by police.
+
+;;;###autoload
+(defun diminish-undo (mode)
+  "Restore mode-line display of diminished mode MODE to its minor-mode value.
+Do nothing if the arg is a minor mode that hasn't been diminished.
+
+Interactively, enter (with completion) the name of any diminished mode (a
+mode that was formerly a minor mode on which you invoked \\[diminish]).
+To restore all diminished modes to minor status, answer `diminished-modes'.
+The response to the prompt shouldn't be quoted.  However, in Lisp code,
+the arg must be quoted as a symbol, as in (diminish-undo 'diminished-modes)."
+  (interactive
+   (list (read (completing-read
+                "Restore what diminished mode: "
+                (cons (list "diminished-modes")
+                      (mapcar (lambda (x) (list (symbol-name (car x))))
+                              diminished-mode-alist))
+                nil t nil 'diminish-history-symbols))))
+  (if (eq mode 'diminished-modes)
+      (let ((diminished-modes diminished-mode-alist))
+        (while diminished-modes
+          (diminish-undo (caar diminished-modes))
+          (callf cdr diminished-modes)))
+    (let ((minor      (assq mode      minor-mode-alist))
+          (diminished (assq mode diminished-mode-alist)))
+      (or minor
+          (error "%S is not currently registered as a minor mode" mode))
+      (when diminished
+        (setcdr minor (cdr diminished))))))
+
+;; Plumber Bob was not from Seattle, my grey city, for rainy Seattle is a
+;; city of interiors, a city of the self-diminished.  When I moved here one
+;; sunny June I was delighted to find that ducks and geese were common in
+;; the streets.  But I hoped to find a loon or two, and all I found were
+;; ducks and geese.  I wondered about this; I wondered why there were no
+;; loons in Seattle; but my confusion resulted from my ignorance of the
+;; psychology of rain, which is to say my ignorance of diminished modes.
+;; What I needed, and lacked, was a way to discover they were there.
+
+;;;###autoload
+(defun diminished-modes ()
+  "Echo all active diminished or minor modes as if they were minor.
+The display goes in the echo area; if it's too long even for that,
+you can see the whole thing in the *Messages* buffer.
+This doesn't change the status of any modes; it just lets you see
+what diminished modes would be on the mode-line if they were still minor."
+  (interactive)
+  (let ((minor-modes minor-mode-alist)
+        message)
+    (while minor-modes
+      (when (symbol-value (caar minor-modes))
+        ;; This minor mode is active in this buffer
+        (let* ((mode-pair (car minor-modes))
+               (mode (car mode-pair))
+               (minor-pair (or (assq mode diminished-mode-alist) mode-pair))
+               (minor-name (cadr minor-pair)))
+          (when (symbolp minor-name)
+            ;; This minor mode uses symbol indirection in the cdr
+            (let ((symbols-seen (list minor-name)))
+              (while (and (symbolp (callf symbol-value minor-name))
+                          (not (memq minor-name symbols-seen)))
+                (push minor-name symbols-seen))))
+          (push minor-name message)))
+      (callf cdr minor-modes))
+    (setq message (mapconcat 'identity (nreverse message) ""))
+    (when (= (string-to-char message) ?\ )
+      (callf substring message 1))
+    (message "%s" message)))
+
+;; A human mind is a Black Forest of diminished modes.  Some are dangerous;
+;; most of the mind of an intimate is a secret stranger, and these diminished
+;; modes are rendered more unpredictable by their long isolation from the
+;; corrective influence of interaction with reality.  The student of history
+;; learns that this description applies to whole societies as well.  In some
+;; ways the self-diminished are better able to discern the night worker.
+;; They are rendered safer by their heightened awareness of others'
+;; diminished modes, and more congenial by the spare blandness of their own
+;; mode lines.  To some people rain is truly depressing, but others it just
+;; makes pensive, and, forcing them indoors where they may not have the
+;; luxury of solitude, teaches them to self-diminish.  That was what I had
+;; not understood when I was searching for loons among the ducks and geese.
+;; Loons come to Seattle all the time, but the ones that like it learn to be
+;; silent, learn to self-diminish, and take on the colors of ducks and geese.
+;; Now, here a dozen years, I can recognize them everywhere, standing quietly
+;; in line with the ducks and geese at the espresso counter, gazing placidly
+;; out on the world through loon-red eyes, thinking secret thoughts.
+
+(provide 'diminish)
+
+;;; diminish.el ends here