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;; This file is part of Cunning Bot, an IRC bot written in Guile Scheme.
;; Copyright (C) 2013 Ian Price
;; This program 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 program 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/>.
(define-module (cunning-bot plugins)
#:use-module (srfi srfi-9)
#:use-module ((srfi srfi-1) #:select (alist-cons remove))
#:use-module (cunning-bot bot)
#:export (use-plugin!
use-plugins!
remove-plugin!
))
(define (module-unuse! module interface)
(cond ((member interface (module-uses module))
(set-module-uses! module (remove (lambda (x) (eqv? x interface)) (module-uses module)))
(hash-clear! (module-import-obarray module)) ; necessary?
(module-modified module))
(else
(throw 'something))))
(define-record-type plugin
(%make-plugin module interface setup teardown)
plugin?
(module plugin-module)
(interface plugin-interface)
(setup plugin-setup-procedure)
(teardown plugin-teardown-procedure))
(define (lookup-plugin plugin-name)
(define module
(resolve-module `(cunning-bot plugins ,plugin-name)))
(define hidden-exports
(filter (lambda (f)
(module-defined? module f))
magic-exports))
(define public-interface
(resolve-interface `(cunning-bot plugins ,plugin-name) #:hide hidden-exports))
(define setup! (module-ref module 'setup! #f))
(define teardown! (module-ref module 'teardown! #f))
(%make-plugin module public-interface setup! teardown!))
;; Setup should take additional arguments
(define magic-exports '(setup! teardown!))
(define (use-plugin! bot plugin-name)
"Loads plugin (cunning-bot plugins PLUGIN-NAME) into BOT.
If PLUGIN-NAME is a symbol, it is the name of the plugin to
load. If it is a list, then the car is the name, and the cdr is the
arguments to give to the setup! procedure of the plugin."
;; TODO: check plugin not already loaded
(define setup-args
(if (pair? plugin-name) (cdr plugin-name) '()))
(define plugin-name*
(if (pair? plugin-name) (car plugin-name) plugin-name))
(define plugin (lookup-plugin plugin-name*))
(define command-module
(get-commands bot))
(module-use! command-module (plugin-interface plugin))
(and=> (plugin-setup-procedure plugin)
(lambda (f) (apply f bot setup-args)))
(and=> (plugin-teardown-procedure plugin)
(lambda (f) (add-quit-hook! bot f)))
(bot-plugins-set! bot (alist-cons plugin-name* plugin (bot-plugins bot)))
*unspecified*)
(define (use-plugins! bot plugins)
(for-each (lambda (plugin)
(use-plugin! bot plugin))
plugins))
(define (remove-plugin! bot plugin-name)
(define command-module
(get-commands bot))
(define plugin
(cond ((assoc plugin-name (bot-plugins bot)) => cdr)
(else (throw 'something))))
(module-unuse! command-module (plugin-interface plugin))
(let ((teardown! (plugin-teardown-procedure plugin)))
(when teardown!
(remove-quit-hook! bot teardown!)
(teardown! bot)))
(bot-plugins-set! bot (remove (lambda (x) (eqv? (car x) plugin-name)) (bot-plugins bot)))
*unspecified*)
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