Doc fixes for face functions.

* faces.el (face-spec-set):
* cus-face.el (custom-theme-set-faces, custom-set-faces):
* custom.el (defface): Doc fixes.

Fixes: debbugs:16203

lisp/ChangeLog

+2013-12-21  Chong Yidong  <cyd@gnu.org>
+
+	* faces.el (face-spec-set):
+	* cus-face.el (custom-theme-set-faces, custom-set-faces):
+	* custom.el (defface): Doc fixes (Bug#16203).
+
 2013-12-21  Chong Yidong  <cyd@gnu.org>
 
 	* indent.el (indent-rigidly-map): Add docstring, and move commands

lisp/cus-face.el

@@ -285,47 +285,48 @@ If FRAME is nil, use the global defaults for FACE."
 ;;; Initializing.
 
 (defun custom-set-faces (&rest args)
-  "Initialize faces according to user preferences.
-This associates the settings with the `user' theme.
+  "Apply a list of face specs for user customizations.
+This works by calling `custom-theme-set-faces' for the `user'
+theme, a special theme referring to settings made via Customize.
 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."
+See the documentation of `custom-theme-set-faces' for details."
   (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:
+  "Apply a list of face specs associated with theme THEME.
+THEME should be a theme name (a symbol).  The special theme named
+`user' refers to user settings applied via Customize.
+
+The remaining ARGS should be a list where each entry is a list of
+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.
+FACE should be a face name (a symbol).  If FACE is a face alias,
+the setting refers to the parent face.
 
-If NOW is present and non-nil, FACE is created now, according to SPEC.
-COMMENT is a string comment about FACE.
+SPEC should be a face spec.  For details, see `defface'.
+
+NOW, if present and non-nil, forces the face settings to take
+immediate effect in the Emacs display; in particular, FACE is
+initialized as a face if it is not yet one.  If NOW is omitted or
+nil, the caller is responsible for making the settings take
+effect later, by calling `custom-theme-recalc-face' or
+`face-spec-recalc'.
 
-Several properties of THEME and FACE are used in the process:
+COMMENT is a string comment about FACE.
 
-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.
+This function works by calling `custom-push-theme' to record each
+SPEC in each FACE's `theme-face' property, and in THEME's
+`theme-settings' property.  If FACE has not already been
+customized, it also stores SPEC in the `saved-face' property.
 
-SPEC itself is saved in FACE property `saved-face' and it is stored in
-FACE's list property `theme-face' \(using `custom-push-theme')."
+If THEME has a non-nil `theme-immediate' property, this is
+equivalent to providing the NOW argument to all faces in the
+argument list."
   (custom-check-theme theme)
   (let ((immediate (get theme 'theme-immediate)))
     (dolist (entry args)

lisp/custom.el

@@ -353,7 +353,7 @@ FACE does not need to be quoted.
 
 Third argument DOC is the face documentation.
 
-If FACE has been set with `custom-set-faces', set the face
+If FACE has been set with `custom-theme-set-faces', set the face
 attributes as specified by that function, otherwise set the face
 attributes according to SPEC.
 
@@ -361,7 +361,7 @@ The remaining arguments should have the form [KEYWORD VALUE]...
 For a list of valid keywords, see the common keywords listed in
 `defcustom'.
 
-SPEC should be an alist of the form
+SPEC should be a \"face spec\", i.e., an alist of the form
 
    ((DISPLAY . ATTS)...)
 

lisp/faces.el

@@ -1576,7 +1576,11 @@ See `defface' for the format of SPEC.
 
 The appearance of each face is controlled by its spec, and by the
 internal face attributes (which can be frame-specific and can be
-set via `set-face-attribute').
+set via `set-face-attribute').  This function sets the former.
+
+In addition to setting the face spec, this function defines FACE
+as a valid face name if it is not already one, and (re)calculates
+the face's attributes on existing frames.
 
 The argument SPEC-TYPE determines which spec to set:
   nil or `face-override-spec' means the override spec (which is
@@ -1589,11 +1593,7 @@ The argument SPEC-TYPE determines which spec to set:
   `reset' means to ignore SPEC, but clear the `customized-face'
     and `face-override-spec' specs;
 Any other value means not to set any spec, but to run the
-function for its other effects.
-
-In addition to setting the face spec, this function defines FACE
-as a valid face name if it is not already one, and (re)calculates
-the face's attributes on existing frames."
+function for its other effects."
   (if (get face 'face-alias)
       (setq face (get face 'face-alias)))
   ;; Save SPEC to the relevant symbol property.