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[gnu-emacs] / lisp / cus-face.el

;;; cus-face.el --- customization support for faces
;;
;; Copyright (C) 1996-1997, 1999-2012 Free Software Foundation, Inc.
;;
;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
;; Keywords: help, faces
;; Package: emacs

;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; See `custom.el'.

;;; Code:

(defalias 'custom-facep 'facep)

;;; Declaring a face.

(defun custom-declare-face (face spec doc &rest args)
  "Like `defface', but FACE is evaluated as a normal argument."
  (unless (get face 'face-defface-spec)
    (let ((facep (facep face)))
      (unless facep
        ;; If the user has already created the face, respect that.
        (let ((value (or (get face 'saved-face) spec))
              (have-window-system (memq initial-window-system '(x w32))))
          ;; Create global face.
          (make-empty-face face)
          ;; Create frame-local faces
          (dolist (frame (frame-list))
            (face-spec-set-2 face frame value)
            (when (memq (window-system frame) '(x w32 ns))
              (setq have-window-system t)))
          ;; When making a face after frames already exist
          (if have-window-system
              (make-face-x-resource-internal face))))
      ;; Don't record SPEC until we see it causes no errors.
      (put face 'face-defface-spec (purecopy spec))
      (push (cons 'defface face) current-load-list)
      (when (and doc (null (face-documentation face)))
        (set-face-documentation face (purecopy doc)))
      (custom-handle-all-keywords face args 'custom-face)
      (run-hooks 'custom-define-hook)
      ;; If the face had existing settings, recalculate it.  For
      ;; example, the user might load a theme with a face setting, and
      ;; later load a library defining that face.
      (if facep
          (custom-theme-recalc-face face))))
  face)

;;; Face attributes.

(defconst custom-face-attributes
  '((:family
     (string :tag "Font Family"
             :help-echo "Font family or fontset alias name."))

    (:foundry
     (string :tag "Font Foundry"
             :help-echo "Font foundry name."))

    (:width
     (choice :tag "Width"
             :help-echo "Font width."
             :value normal              ; default
             (const :tag "compressed" condensed)
             (const :tag "condensed" condensed)
             (const :tag "demiexpanded" semi-expanded)
             (const :tag "expanded" expanded)
             (const :tag "extracondensed" extra-condensed)
             (const :tag "extraexpanded" extra-expanded)
             (const :tag "medium" normal)
             (const :tag "narrow" condensed)
             (const :tag "normal" normal)
             (const :tag "regular" normal)
             (const :tag "semicondensed" semi-condensed)
             (const :tag "semiexpanded" semi-expanded)
             (const :tag "ultracondensed" ultra-condensed)
             (const :tag "ultraexpanded" ultra-expanded)
             (const :tag "wide" extra-expanded)))

    (:height
     (choice :tag "Height"
             :help-echo "Face's font height."
             :value 1.0                 ; default
             (integer :tag "Height in 1/10 pt")
             (number :tag "Scale" 1.0)))

    (:weight
     (choice :tag "Weight"
             :help-echo "Font weight."
             :value normal              ; default
             (const :tag "black" ultra-bold)
             (const :tag "bold" bold)
             (const :tag "book" semi-light)
             (const :tag "demibold" semi-bold)
             (const :tag "extralight" extra-light)
             (const :tag "extrabold" extra-bold)
             (const :tag "heavy" extra-bold)
             (const :tag "light" light)
             (const :tag "medium" normal)
             (const :tag "normal" normal)
             (const :tag "regular" normal)
             (const :tag "semibold" semi-bold)
             (const :tag "semilight" semi-light)
             (const :tag "ultralight" ultra-light)
             (const :tag "ultrabold" ultra-bold)
             (const :tag "thin" thin)))

    (:slant
     (choice :tag "Slant"
             :help-echo "Font slant."
             :value normal              ; default
             (const :tag "italic" italic)
             (const :tag "oblique" oblique)
             (const :tag "normal" normal)
             (const :tag "roman" roman)))

    (:underline
     (choice :tag "Underline"
             :help-echo "Control text underlining."
             (const :tag "Off" nil)
             (list :tag "On"
                   (const :format "" :value :color)
                   (choice :tag "Color" (const :tag "Foreground Color" foreground-color) color)
                   (const :format "" :value :style)
                   (choice :tag "Style"
                           (const :tag "Line" line)
                           (const :tag "Wave" wave)))))

    (:overline
     (choice :tag "Overline"
             :help-echo "Control text overlining."
             (const :tag "Off" nil)
             (const :tag "On" t)
             (color :tag "Colored")))

    (:strike-through
     (choice :tag "Strike-through"
             :help-echo "Control text strike-through."
             (const :tag "Off" nil)
             (const :tag "On" t)
             (color :tag "Colored")))

    (:box
     ;; Fixme: this can probably be done better.
     (choice :tag "Box around text"
             :help-echo "Control box around text."
             (const :tag "Off" nil)
             (list :tag "Box"
                   :value (:line-width 2 :color "grey75" :style released-button)
                   (const :format "" :value :line-width)
                   (integer :tag "Width")
                   (const :format "" :value :color)
                   (choice :tag "Color" (const :tag "*" nil) color)
                   (const :format "" :value :style)
                   (choice :tag "Style"
                           (const :tag "Raised" released-button)
                           (const :tag "Sunken" pressed-button)
                           (const :tag "None" nil))))
     ;; filter to make value suitable for customize
     (lambda (real-value)
       (and real-value
            (let ((lwidth
                   (or (and (consp real-value)
                            (plist-get real-value :line-width))
                       (and (integerp real-value) real-value)
                       1))
                  (color
                   (or (and (consp real-value) (plist-get real-value :color))
                       (and (stringp real-value) real-value)
                       nil))
                  (style
                   (and (consp real-value) (plist-get real-value :style))))
              (list :line-width lwidth :color color :style style))))
     ;; filter to make customized-value suitable for storing
     (lambda (cus-value)
       (and cus-value
            (let ((lwidth (plist-get cus-value :line-width))
                  (color (plist-get cus-value :color))
                  (style (plist-get cus-value :style)))
              (cond ((and (null color) (null style))
                     lwidth)
                    ((and (null lwidth) (null style))
                     ;; actually can't happen, because LWIDTH is always an int
                     color)
                    (t
                     ;; Keep as a plist, but remove null entries
                     (nconc (and lwidth `(:line-width ,lwidth))
                            (and color  `(:color ,color))
                            (and style  `(:style ,style)))))))))

    (:inverse-video
     (choice :tag "Inverse-video"
             :help-echo "Control whether text should be in inverse-video."
             (const :tag "Off" nil)
             (const :tag "On" t)))

    (:foreground
     (color :tag "Foreground"
            :help-echo "Set foreground color (name or #RRGGBB hex spec)."))

    (:background
     (color :tag "Background"
            :help-echo "Set background color (name or #RRGGBB hex spec)."))

    (:stipple
     (choice :tag "Stipple"
             :help-echo "Background bit-mask"
             (const :tag "None" nil)
             (file :tag "File"
                   :help-echo "Name of bitmap file."
                   :must-match t)))

    (:inherit
     (repeat :tag "Inherit"
             :help-echo "List of faces to inherit attributes from."
             (face :Tag "Face" default))
     ;; filter to make value suitable for customize
     (lambda (real-value)
       (cond ((or (null real-value) (eq real-value 'unspecified))
              nil)
             ((symbolp real-value)
              (list real-value))
             (t
              real-value)))
     ;; filter to make customized-value suitable for storing
     (lambda (cus-value)
       (if (and (consp cus-value) (null (cdr cus-value)))
           (car cus-value)
         cus-value))))

  "Alist of face attributes.

The elements are of the form (KEY TYPE PRE-FILTER POST-FILTER),
where KEY is the name of the attribute, TYPE is a widget type for
editing the attribute, PRE-FILTER is a function to make the attribute's
value suitable for the customization widget, and POST-FILTER is a
function to make the customized value suitable for storing.  PRE-FILTER
and POST-FILTER are optional.

The PRE-FILTER should take a single argument, the attribute value as
stored, and should return a value for customization (using the
customization type TYPE).

The POST-FILTER should also take a single argument, the value after
being customized, and should return a value suitable for setting the
given face attribute.")

(defun custom-face-attributes-get (face frame)
  "For FACE on FRAME, return an alternating list describing its attributes.
The list has the form (KEYWORD VALUE KEYWORD VALUE...).
Each keyword should be listed in `custom-face-attributes'.

If FRAME is nil, use the global defaults for FACE."
  (let ((attrs custom-face-attributes)
        plist)
    (while attrs
      (let* ((attribute (car (car attrs)))
             (value (face-attribute face attribute frame)))
        (setq attrs (cdr attrs))
        (unless (or (eq value 'unspecified)
                    (and (null value) (memq attribute '(:inherit))))
          (setq plist (cons attribute (cons value plist))))))
    plist))

;;; Initializing.

(defun custom-set-faces (&rest args)
  "Initialize faces according to user preferences.
This associates the settings with the `user' theme.
The arguments should be a list where each entry has the form:

  (FACE SPEC [NOW [COMMENT]])

SPEC is stored as the saved value for FACE, as well as the value for the
`user' theme.  The `user' theme is one of the default themes known to Emacs.
See `custom-known-themes' for more information on the known themes.
See `custom-theme-set-faces' for more information on the interplay
between themes and faces.
See `defface' for the format of SPEC.

If NOW is present and non-nil, FACE is created now, according to SPEC.
COMMENT is a string comment about FACE."
  (apply 'custom-theme-set-faces 'user args))

(defun custom-theme-set-faces (theme &rest args)
  "Initialize faces for theme THEME.
The arguments should be a list where each entry has the form:

  (FACE SPEC [NOW [COMMENT]])

SPEC is stored as the saved value for FACE, as well as the value for the
`user' theme.  The `user' theme is one of the default themes known to Emacs.
See `custom-known-themes' for more information on the known themes.
See `custom-theme-set-faces' for more information on the interplay
between themes and faces.
See `defface' for the format of SPEC.

If NOW is present and non-nil, FACE is created now, according to SPEC.
COMMENT is a string comment about FACE.

Several properties of THEME and FACE are used in the process:

If THEME property `theme-immediate' is non-nil, this is equivalent of
providing the NOW argument to all faces in the argument list: FACE is
created now.  The only difference is FACE property `force-face': if NOW
is non-nil, FACE property `force-face' is set to the symbol `rogue', else
if THEME property `theme-immediate' is non-nil, FACE property `force-face'
is set to the symbol `immediate'.

SPEC itself is saved in FACE property `saved-face' and it is stored in
FACE's list property `theme-face' \(using `custom-push-theme')."
  (custom-check-theme theme)
  (let ((immediate (get theme 'theme-immediate)))
    (dolist (entry args)
      (unless (listp entry)
        (error "Incompatible Custom theme spec"))
      (let ((face (car entry))
            (spec (nth 1 entry)))
        ;; If FACE is actually an alias, customize the face it
        ;; is aliased to.
        (if (get face 'face-alias)
            (setq face (get face 'face-alias)))
        (if custom--inhibit-theme-enable
            ;; Just update theme settings.
            (custom-push-theme 'theme-face face theme 'set spec)
          ;; Update theme settings and set the face spec.
          (let ((now (nth 2 entry))
                (comment (nth 3 entry))
                (oldspec (get face 'theme-face)))
            (when (not (and oldspec (eq 'user (caar oldspec))))
              (put face 'saved-face spec)
              (put face 'saved-face-comment comment))
            ;; Do this AFTER checking the `theme-face' property.
            (custom-push-theme 'theme-face face theme 'set spec)
            (when (or now immediate)
              (put face 'force-face (if now 'rogue 'immediate)))
            (when (or now immediate (facep face))
              (unless (facep face)
                (make-empty-face face))
              (put face 'face-comment comment)
              (put face 'face-override-spec nil)
              (face-spec-set face spec t))))))))

;; XEmacs compatibility function.  In XEmacs, when you reset a Custom
;; Theme, you have to specify the theme to reset it to.  We just apply
;; the next theme.
(defun custom-theme-reset-faces (theme &rest args)
  "Reset the specs in THEME of some faces to their specs in other themes.
Each of the arguments ARGS has this form:

    (FACE IGNORED)

This means reset FACE.  The argument IGNORED is ignored."
  (custom-check-theme theme)
  (dolist (arg args)
    (custom-push-theme 'theme-face (car arg) theme 'reset)))

(defun custom-reset-faces (&rest args)
  "Reset the specs of some faces to their specs in specified themes.
This creates settings in the `user' theme.

Each of the arguments ARGS has this form:

    (FACE FROM-THEME)

This means reset FACE to its value in FROM-THEME."
  (apply 'custom-theme-reset-faces 'user args))

;;; The End.

(provide 'cus-face)

;;; cus-face.el ends here