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414 lines
16 KiB
EmacsLisp
414 lines
16 KiB
EmacsLisp
;;; face-remap.el --- Functions for managing `face-remapping-alist'
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;;
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;; Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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;;
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;; Author: Miles Bader <miles@gnu.org>
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;; Keywords: faces face remapping display user commands
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;;
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;; This file is part of GNU Emacs.
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;;
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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 3 of the License, or
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;; (at your option) any later version.
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;;
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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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;
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;;; Commentary:
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;;
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;; This file defines some simple operations that can be used for
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;; maintaining the `face-remapping-alist' in a cooperative way. This is
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;; especially important for the `default' face.
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;;
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;; Each face-remapping definition in `face-remapping-alist' added by
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;; this code uses the form:
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;;
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;; (face RELATIVE_SPECS_1 RELATIVE_SPECS_2 ... BASE_SPECS)
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;;
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;; The "specs" values are a lists of face names or face attribute-value
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;; pairs, and are merged together, with earlier values taking precedence.
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;;
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;; The RELATIVE_SPECS_* values are added by `face-remap-add-relative'
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;; (and removed by `face-remap-remove-relative', and are intended for
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;; face "modifications" (such as increasing the size). Typical users of
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;; relative specs would be minor modes.
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;;
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;; BASE_SPECS is the lowest-priority value, and by default is just the
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;; face name, which causes the global definition of that face to be used.
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;;
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;; A non-default value of BASE_SPECS may also be set using
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;; `face-remap-set-base'. Because this _overwrites_ the default
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;; value inheriting from the global face definition, it is up to the
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;; caller of face-remap-set-base to add such inheritance if it is
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;; desired. A typical use of face-remap-set-base would be a major
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;; mode setting face remappings, e.g., of the default face.
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;;
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;; All modifications cause face-remapping-alist to be made buffer-local.
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;;
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;;; Code:
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;; ----------------------------------------------------------------
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;; Utility functions
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;; Names of face attributes corresponding to lisp face-vector positions.
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;; This variable should probably be defined in C code where the actual
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;; definitions are available.
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;;
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(defvar internal-lisp-face-attributes
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[nil
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:family :foundry :swidth :height :weight :slant :underline :inverse
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:foreground :background :stipple :overline :strike :box
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:font :inherit :fontset :vector])
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(defun face-attrs-more-relative-p (attrs1 attrs2)
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"Return true if ATTRS1 contains a greater number of relative
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face-attributes than ATTRS2. A face attribute is considered
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relative if `face-attribute-relative-p' returns non-nil.
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ATTRS1 and ATTRS2 may be any value suitable for a `face' text
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property, including face names, lists of face names,
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face-attribute plists, etc.
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This function can be used as a predicate with `sort', to sort
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face lists so that more specific faces are located near the end."
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(unless (vectorp attrs1)
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(setq attrs1 (face-attributes-as-vector attrs1)))
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(unless (vectorp attrs2)
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(setq attrs2 (face-attributes-as-vector attrs2)))
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(let ((rel1-count 0) (rel2-count 0))
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(dotimes (i (length attrs1))
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(let ((attr (aref internal-lisp-face-attributes i)))
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(when attr
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(when (face-attribute-relative-p attr (aref attrs1 i))
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(setq rel1-count (+ rel1-count 1)))
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(when (face-attribute-relative-p attr (aref attrs2 i))
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(setq rel2-count (+ rel2-count 1))))))
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(< rel1-count rel2-count)))
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(defun face-remap-order (entry)
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"Order ENTRY so that more relative face specs are near the beginning.
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The list structure of ENTRY may be destructively modified."
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(setq entry (nreverse entry))
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(setcdr entry (sort (cdr entry) 'face-attrs-more-relative-p))
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(nreverse entry))
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;;;###autoload
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(defun face-remap-add-relative (face &rest specs)
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"Add a face remapping entry of FACE to SPECS in the current buffer.
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Return a cookie which can be used to delete the remapping with
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`face-remap-remove-relative'.
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SPECS can be any value suitable for the `face' text property,
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including a face name, a list of face names, or a face-attribute
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property list. The attributes given by SPECS will be merged with
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any other currently active face remappings of FACE, and with the
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global definition of FACE. An attempt is made to sort multiple
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entries so that entries with relative face-attributes are applied
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after entries with absolute face-attributes.
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The base (lowest priority) remapping may be set to a specific
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value, instead of the default of the global face definition,
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using `face-remap-set-base'."
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(while (and (consp specs) (null (cdr specs)))
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(setq specs (car specs)))
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(make-local-variable 'face-remapping-alist)
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(let ((entry (assq face face-remapping-alist)))
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(when (null entry)
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(setq entry (list face face)) ; explicitly merge with global def
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(push entry face-remapping-alist))
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(setcdr entry (face-remap-order (cons specs (cdr entry))))
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(cons face specs)))
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(defun face-remap-remove-relative (cookie)
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"Remove a face remapping previously added by `face-remap-add-relative'.
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COOKIE should be the return value from that function."
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(let ((remapping (assq (car cookie) face-remapping-alist)))
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(when remapping
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(let ((updated-entries (remq (cdr cookie) (cdr remapping))))
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(unless (eq updated-entries (cdr remapping))
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(setcdr remapping updated-entries)
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(when (or (null updated-entries)
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(and (eq (car-safe updated-entries) (car cookie))
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(null (cdr updated-entries))))
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(setq face-remapping-alist
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(remq remapping face-remapping-alist)))
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(cdr cookie))))))
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;;;###autoload
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(defun face-remap-reset-base (face)
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"Set the base remapping of FACE to inherit from FACE's global definition."
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(let ((entry (assq face face-remapping-alist)))
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(when entry
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;; If there's nothing except a base remapping, we simply remove
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;; the entire remapping entry, as setting the base to the default
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;; would be the same as the global definition. Otherwise, we
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;; modify the base remapping.
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(if (null (cddr entry)) ; nothing except base remapping
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(setq face-remapping-alist ; so remove entire entry
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(remq entry face-remapping-alist))
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(setcar (last entry) face))))) ; otherwise, just inherit global def
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;;;###autoload
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(defun face-remap-set-base (face &rest specs)
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"Set the base remapping of FACE in the current buffer to SPECS.
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If SPECS is empty, the default base remapping is restored, which
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inherits from the global definition of FACE; note that this is
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different from SPECS containing a single value `nil', which does
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not inherit from the global definition of FACE."
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(while (and (consp specs) (not (null (car specs))) (null (cdr specs)))
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(setq specs (car specs)))
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(if (or (null specs)
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(and (eq (car specs) face) (null (cdr specs)))) ; default
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;; Set entry back to default
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(face-remap-reset-base face)
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;; Set the base remapping
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(make-local-variable 'face-remapping-alist)
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(let ((entry (assq face face-remapping-alist)))
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(if entry
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(setcar (last entry) specs) ; overwrite existing base entry
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(push (list face specs) face-remapping-alist)))))
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;; ----------------------------------------------------------------
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;; text-scale-mode
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(defcustom text-scale-mode-step 1.2
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"Scale factor used by `text-scale-mode'.
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Each positive or negative step scales the default face height by this amount."
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:group 'display
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:type 'number
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:version "23.1")
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;; current remapping cookie for text-scale-mode
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(defvar text-scale-mode-remapping nil)
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(make-variable-buffer-local 'text-scale-mode-remapping)
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;; Lighter displayed for text-scale-mode in mode-line minor-mode list
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(defvar text-scale-mode-lighter "+0")
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(make-variable-buffer-local 'text-scale-mode-lighter)
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;; Number of steps that text-scale-mode will increase/decrease text height
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(defvar text-scale-mode-amount 0)
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(make-variable-buffer-local 'text-scale-mode-amount)
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(define-minor-mode text-scale-mode
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"Minor mode for displaying buffer text in a larger/smaller font than usual.
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The amount of scaling is determined by the variable
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`text-scale-mode-amount': one step scales the global default
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face size by the value of the variable `text-scale-mode-step'
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\(a negative amount shrinks the text).
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The `text-scale-increase' and `text-scale-decrease' functions may
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be used to interactively modify the variable
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`text-scale-mode-amount' (they also enable or disable
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`text-scale-mode' as necessary)."
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:lighter (" " text-scale-mode-lighter)
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(when text-scale-mode-remapping
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(face-remap-remove-relative text-scale-mode-remapping))
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(setq text-scale-mode-lighter
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(format (if (>= text-scale-mode-amount 0) "+%d" "%d")
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text-scale-mode-amount))
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(setq text-scale-mode-remapping
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(and text-scale-mode
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(face-remap-add-relative 'default
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:height
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(expt text-scale-mode-step
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text-scale-mode-amount))))
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(force-window-update (current-buffer)))
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;;;###autoload
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(defun text-scale-increase (inc)
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"Increase the height of the default face in the current buffer by INC steps.
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If the new height is other than the default, `text-scale-mode' is enabled.
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Each step scales the height of the default face by the variable
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`text-scale-mode-step' (a negative number of steps decreases the
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height by the same amount). As a special case, an argument of 0
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will remove any scaling currently active."
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(interactive "p")
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(setq text-scale-mode-amount
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(if (= inc 0) 0 (+ (if text-scale-mode text-scale-mode-amount 0) inc)))
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(text-scale-mode (if (zerop text-scale-mode-amount) -1 1)))
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;;;###autoload
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(defun text-scale-decrease (dec)
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"Decrease the height of the default face in the current buffer by DEC steps.
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See `text-scale-increase' for more details."
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(interactive "p")
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(text-scale-increase (- dec)))
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;;;###autoload (define-key ctl-x-map [(control ?+)] 'text-scale-adjust)
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;;;###autoload (define-key ctl-x-map [(control ?-)] 'text-scale-adjust)
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;;;###autoload (define-key ctl-x-map [(control ?=)] 'text-scale-adjust)
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;;;###autoload (define-key ctl-x-map [(control ?0)] 'text-scale-adjust)
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;;;###autoload
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(defun text-scale-adjust (inc)
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"Increase or decrease the height of the default face in the current buffer.
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The actual adjustment made depends on the final component of the
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key-binding used to invoke the command, with all modifiers removed:
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+, = Increase the default face height by one step
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- Decrease the default face height by one step
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0 Reset the default face height to the global default
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Then, continue to read input events and further adjust the face
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height as long as the input event read (with all modifiers removed)
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is one of the above.
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Each step scales the height of the default face by the variable
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`text-scale-mode-step' (a negative number of steps decreases the
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height by the same amount). As a special case, an argument of 0
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will remove any scaling currently active.
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This command is a special-purpose wrapper around the
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`text-scale-increase' command which makes repetition convenient
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even when it is bound in a non-top-level keymap. For binding in
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a top-level keymap, `text-scale-increase' or
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`text-scale-decrease' may be more appropriate."
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(interactive "p")
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(let ((first t)
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(step t)
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(ev last-command-event)
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(echo-keystrokes nil))
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(while step
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(let ((base (event-basic-type ev)))
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(cond ((or (eq base ?+) (eq base ?=))
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(setq step inc))
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((eq base ?-)
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(setq step (- inc)))
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((eq base ?0)
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(setq step 0))
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(first
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(setq step inc))
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(t
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(setq step nil))))
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(when step
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(text-scale-increase step)
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(setq inc 1 first nil)
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(setq ev (read-event))))
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(push ev unread-command-events)))
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;; ----------------------------------------------------------------
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;; buffer-face-mode
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(defcustom buffer-face-mode-face 'variable-pitch
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"The face specification used by `buffer-face-mode'.
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It may contain any value suitable for a `face' text property,
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including a face name, a list of face names, a face-attribute
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plist, etc."
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:group 'display
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:version "23.1")
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;; current remapping cookie for buffer-face-mode
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(defvar buffer-face-mode-remapping nil)
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(make-variable-buffer-local 'buffer-face-mode-remapping)
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;;;###autoload
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(define-minor-mode buffer-face-mode
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"Minor mode for a buffer-specific default face.
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When enabled, the face specified by the variable
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`buffer-face-mode-face' is used to display the buffer text."
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:lighter " BufFace"
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(when buffer-face-mode-remapping
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(face-remap-remove-relative buffer-face-mode-remapping))
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(setq buffer-face-mode-remapping
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(and buffer-face-mode
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(face-remap-add-relative 'default buffer-face-mode-face)))
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(force-window-update (current-buffer)))
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;;;###autoload
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(defun buffer-face-set (&rest specs)
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"Enable `buffer-face-mode', using face specs SPECS.
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SPECS can be any value suitable for the `face' text property,
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including a face name, a list of face names, or a face-attribute
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If SPECS is nil, then `buffer-face-mode' is disabled.
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This function will make the variable `buffer-face-mode-face'
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buffer local, and set it to FACE."
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(interactive (list (read-face-name "Set buffer face")))
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(while (and (consp specs) (null (cdr specs)))
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(setq specs (car specs)))
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(if (null specs)
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(buffer-face-mode 0)
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(set (make-local-variable 'buffer-face-mode-face) specs)
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(buffer-face-mode t)))
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;;;###autoload
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(defun buffer-face-toggle (&rest specs)
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"Toggle `buffer-face-mode', using face specs SPECS.
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SPECS can be any value suitable for the `face' text property,
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including a face name, a list of face names, or a face-attribute
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If `buffer-face-mode' is already enabled, and is currently using
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the face specs SPECS, then it is disabled; if buffer-face-mode is
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disabled, or is enabled and currently displaying some other face,
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then is left enabled, but the face changed to reflect SPECS.
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This function will make the variable `buffer-face-mode-face'
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buffer local, and set it to SPECS."
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(interactive (list buffer-face-mode-face))
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(while (and (consp specs) (null (cdr specs)))
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(setq specs (car specs)))
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(if (or (null specs)
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(and buffer-face-mode (equal buffer-face-mode-face specs)))
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(buffer-face-mode 0)
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(set (make-local-variable 'buffer-face-mode-face) specs)
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(buffer-face-mode t)))
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(defun buffer-face-mode-invoke (specs arg &optional interactive)
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"Enable or disable `buffer-face-mode' using face specs SPECS, and argument ARG.
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ARG controls whether the mode is enabled or disabled, and is
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interpreted in the usual manner for minor-mode commands.
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SPECS can be any value suitable for the `face' text property,
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including a face name, a list of face names, or a face-attribute
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If INTERACTIVE is non-nil, a message will be displayed describing the result.
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This is a wrapper function which calls `buffer-face-set' or
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`buffer-face-toggle' (depending on ARG), and prints a status
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message in the echo area. In many cases one of those functions
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may be more appropriate."
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(let ((last-message (current-message)))
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(if (or (eq arg 'toggle) (not arg))
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(buffer-face-toggle specs)
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(buffer-face-set (and (> (prefix-numeric-value arg) 0) specs)))
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(when interactive
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(unless (and (current-message)
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(not (equal last-message (current-message))))
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(message "Buffer-Face mode %sabled"
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(if buffer-face-mode "en" "dis"))))))
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;; ----------------------------------------------------------------
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;; variable-pitch-mode
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;;;###autoload
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(defun variable-pitch-mode (&optional arg)
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"Variable-pitch default-face mode.
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An interface to `buffer-face-mode' which uses the `variable-pitch' face.
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Besides the choice of face, it is the same as `buffer-face-mode'."
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(interactive (list (or current-prefix-arg 'toggle)))
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(buffer-face-mode-invoke 'variable-pitch arg (interactive-p)))
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(provide 'face-remap)
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;; arch-tag: 5c5f034b-8d58-4967-82bd-d61fd364e686
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;;; face-remap.el ends here
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