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;; geiser-impl.el -- generic support for scheme implementations
;; Copyright (C) 2009 Jose Antonio Ortega Ruiz
;; Author: Jose Antonio Ortega Ruiz <jao@gnu.org>
;; Start date: Sat Mar 07, 2009 23:32
;; This file 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.
;; This file 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. If not, see <http://www.gnu.org/licenses/>.
;;; Comentary:
;; Functions to handle setup of Scheme implementations supported by
;; Geiser.
;;; Code:
(require 'geiser-eval)
(require 'geiser-base)
(require 'geiser-doc)
(require 'geiser-completion)
;;; Customization:
(defgroup geiser-impl nil
"Generic support for multiple Scheme implementations."
:group 'geiser)
(defcustom geiser-impl-default-implementation nil
"Symbol naming the default Scheme implementation."
:type 'symbol
:group 'geiser-impl)
(defcustom geiser-impl-installed-implementations nil
"Initial list of installed Scheme implementations."
:type '(repeat symbol)
:group 'geiser-impl)
;;; Registering implementations:
(defvar geiser-impl--impls nil)
(defun geiser-impl--register (impl)
(add-to-list 'geiser-impl--impls impl))
(defun geiser-impl--unregister (impl)
(setq geiser-impl--impls (remove impl geiser-impl--impls)))
(defvar geiser-impl--default-implementation
geiser-impl-default-implementation)
(defun geiser-impl--default-implementation (&optional new)
(when new (setq geiser-impl--default-implementation new))
(or geiser-impl--default-implementation
geiser-impl-default-implementation
(car geiser-impl--impls)))
(defsubst geiser-impl--impl-str (&optional impl)
(let ((impl (or impl geiser-impl--implementation)))
(and impl (capitalize (format "%s" impl)))))
(defsubst geiser-impl--impl-feature (impl)
(intern (format "geiser-%s" impl)))
;;; Installing Scheme implementations:
(make-variable-buffer-local
(defvar geiser-impl--implementation nil))
(defvar geiser-impl--impl-prompt-history nil)
(defun geiser-impl--read-impl (&optional prompt impls non-req)
(let* ((impls (or impls geiser-impl--impls))
(impls (mapcar (lambda (s) (format "%s" s)) impls))
(prompt (or prompt "Scheme implementation: ")))
(intern (completing-read prompt impls nil (not non-req) nil
geiser-impl--impl-prompt-history
(and (car geiser-impl--impls)
(symbol-name (car geiser-impl--impls)))))))
(defun geiser-impl--set-buffer-implementation (&optional impl)
(let ((impl (or impl
(geiser-impl--guess)
(geiser-impl--read-impl nil nil t))))
(require (geiser-impl--impl-feature impl))
(setq geiser-impl--implementation impl)
(geiser-impl--install-eval impl)
(geiser-impl--register impl)))
(defsubst geiser-impl--sym (imp name)
(intern (format "geiser-%s-%s" imp name)))
(defsubst geiser-impl--boundp (imp name)
(boundp (geiser-impl--sym imp name)))
(defsubst geiser-impl--fboundp (imp name)
(fboundp (geiser-impl--sym imp name)))
(defun geiser-impl--value (imp name &optional fun)
(let ((sym (geiser-impl--sym imp name)))
(unless (or (and (not fun) (boundp sym))
(and fun (fboundp sym)))
(error "Unbound %s '%s' in Geiser Scheme implementation %s"
(if fun "function" "variable") sym imp))
(if fun (symbol-function sym) (symbol-value sym))))
(defsubst geiser-impl--call-if-bound (imp name &rest args)
(when (geiser-impl--fboundp imp name)
(apply (geiser-impl--value imp name t) args)))
(defsubst geiser-impl--module-function (impl)
(geiser-impl--sym impl "get-module"))
(defsubst geiser-impl--geiser-procedure-function (impl)
(geiser-impl--sym impl "geiser-procedure"))
(defsubst geiser-impl--external-help-function (impl)
(let ((f (geiser-impl--sym impl "external-help")))
(and (fboundp f) f)))
(defsubst geiser-impl--symbol-begin (impl)
(geiser-impl--sym impl "symbol-begin"))
(defun geiser-impl--install-eval (impl)
(setq geiser-eval--get-module-function
(geiser-impl--module-function impl))
(setq geiser-eval--geiser-procedure-function
(geiser-impl--geiser-procedure-function impl))
(setq geiser-doc--external-help-function
(geiser-impl--external-help-function impl))
(setq geiser-completion--symbol-begin-function
(geiser-impl--symbol-begin impl)))
;;; Evaluating Elisp in a given implementation context:
(defun with--geiser-implementation (imp thunk)
(let ((geiser-impl--implementation imp)
(geiser-eval--get-module-function
(geiser-impl--module-function imp))
(geiser-eval--geiser-procedure-function
(geiser-impl--geiser-procedure-function imp))
(geiser-doc--external-help-function
(geiser-impl--external-help-function imp))
(geiser-completion--symbol-begin-function
(geiser-impl--symbol-begin imp)))
(funcall thunk)))
(put 'with--geiser-implementation 'lisp-indent-function 1)
;;; Default evaluation environment:
(defun geiser-impl-module (&optional module)
(geiser-impl--call-if-bound (geiser-impl--default-implementation)
"get-module"
module))
(set-default 'geiser-eval--get-module-function 'geiser-impl-module)
(defun geiser-impl-geiser-procedure (proc)
(geiser-impl--call-if-bound (geiser-impl--default-implementation)
"geiser-procedure"
proc))
(set-default 'geiser-eval--geiser-procedure-function 'geiser-impl-geiser-procedure)
;;; Access to implementation specific execution parameters:
(defsubst geiser-impl--binary (impl)
(or (geiser-impl--call-if-bound impl "binary")
(geiser-impl--value impl "binary")))
(defsubst geiser-impl--parameters (impl)
(or (geiser-impl--call-if-bound impl "parameters")
(ignore-errors (geiser-impl--value impl "parameters"))))
(defsubst geiser-impl--prompt-regexp (impl)
(or (geiser-impl--call-if-bound impl "prompt-regexp")
(geiser-impl--value impl "prompt-regexp")))
(defsubst geiser-impl--startup (impl)
(geiser-impl--call-if-bound impl "startup"))
;;; Access to implementation guessing function:
(make-variable-buffer-local
(defvar geiser-scheme-implementation nil
"Set this buffer local variable to specify the Scheme
implementation to be used by Geiser."))
(defun geiser-impl--guess ()
(or geiser-impl--implementation
geiser-scheme-implementation
(catch 'impl
(dolist (impl geiser-impl--impls)
(when (geiser-impl--call-if-bound impl "guess")
(throw 'impl impl))))
(geiser-impl--default-implementation)))
;;; Unload support
(defun geiser-impl-unload-function ()
(dolist (imp (mapcar 'geiser-impl--impl-feature geiser-impl--impls))
(when (featurep imp) (unload-feature imp)))
t)
(defun geiser-impl--reload-implementations (impls)
(dolist (impl impls)
(load-library (format "geiser-%s" impl))))
;;; Initialization:
(mapc 'geiser-impl--register geiser-impl-installed-implementations)
(provide 'geiser-impl)
;;; geiser-impl.el ends here
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