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;;; geiser-custom.el -- customization utilities -*- lexical-binding: t; -*-
;; Copyright (C) 2009, 2010, 2012, 2024 Jose Antonio Ortega Ruiz
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the Modified BSD License. You should
;; have received a copy of the license along with this program. If
;; not, see <http://www.xfree86.org/3.3.6/COPYRIGHT2.html#5>.
;; Start date: Sat Feb 14, 2009 21:49
;;; Code:
(require 'font-lock)
(require 'geiser-base)
;;; Customization group:
(defgroup geiser nil
"Geiser framework for Scheme-Emacs interaction."
:group 'languages)
;;; Faces:
(defgroup geiser-faces nil
"Faces used by Geiser."
:group 'geiser
:group 'faces)
(defmacro geiser-custom--defface (face def group doc)
"Utility macro to define geiser.
This is a very simple macro ensuring all geiser faces follow a common
naming pattern and are added to a common group besides the one provided
in the macro arguments."
(declare (doc-string 4) (indent 1))
(let ((face (intern (format "geiser-font-lock-%s" face))))
`(defface ,face (face-default-spec ,def)
,(format "Face for %s." doc)
:group ',group
:group 'geiser-faces)))
;;; Reload support:
(defvar geiser-custom--memoized-vars nil)
(defun geiser-custom--memoize (name)
;; Why not build this list with mapatoms, filtering on a "\\`'geiser-"
;; prefix and checking that it's a `defcustom', so we don't need
;; `geiser-custom--defcustom'? Because implementation-specific modules using
;; geiser may use similarly named custom variables that are, for some reason
;; or another, not meant to partake in the geiser-reload mechanism, and we
;; don't know their names.
(add-to-list 'geiser-custom--memoized-vars name))
(defmacro geiser-custom--defcustom (name &rest body)
"Like `defcustom' but also put NAME on an internal list.
That list is used by `geiser-reload' to preserve the values of the
listed variables. It is not used for anything else.
Note that, even though defcustom preserves the existing value of a
variable if it's already defined, geiser-reload unloads all geiser
features and therefore undefines all defined variables: we keep this
list of values around to be able to restore them after loading
a (presumably) new version of geiser after that unloading."
(declare (doc-string 3) (debug (name body)) (indent 2))
`(progn
(geiser-custom--memoize ',name)
(defcustom ,name ,@body)))
(defun geiser-custom--memoized-state ()
(let ((result))
(dolist (name geiser-custom--memoized-vars result)
(when (boundp name)
(push (cons name (symbol-value name)) result)))))
(defconst geiser-custom-font-lock-keywords
(eval-when-compile
`((,(concat "(\\(geiser-custom--\\(?:defcustom\\|defface\\)\\)\\_>"
"[ \t'\(]*"
"\\(\\(?:\\sw\\|\\s_\\)+\\)?")
(1 font-lock-keyword-face)
(2 font-lock-variable-name-face nil t)))))
(font-lock-add-keywords 'emacs-lisp-mode geiser-custom-font-lock-keywords)
(provide 'geiser-custom)
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