78 lines
2.4 KiB
EmacsLisp
78 lines
2.4 KiB
EmacsLisp
;;; system --- System library of FG42 -*- lexical-binding: t; -*-
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;;
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;; Copyright (c) 2010-2021 Sameer Rahmani <lxsameer@gnu.org>
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;;
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;; Author: Sameer Rahmani <lxsameer@gnu.org>
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;; URL: https://gitlab.com/FG42/FG42
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;; Version: 3.0.0
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;;
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;; This program is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;
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;;; Commentary:
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;; `System' is just a state monad which holds the state of the editor.
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;; Each system has to have a `start' function to start the setup process.
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;;
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;;; Code:
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(require 'seq)
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(require 'fg42/utils)
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(defun fg42/system-cons (system k v)
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"Set the given key K to the given value V in the SYSTEM."
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(cons (cons k v) system))
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(defun fg42/system-cons-to (system k v)
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"Add the given value V to the value of key K in SYSTEM."
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(let* ((value (fg42/system-get system k))
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(m (fg42/system-cons system k (cons v value))))
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m))
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(defun fg42/system-get (system k)
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"Return the value of the given key K in the SYSTEM."
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(cdr (assoc k system)))
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(comment
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(fg42/system-get (fg42/system-cons '((:1 . 4)) :1 2) :1)
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(fg42/system-get '((:a . ((1 . 2)))) :a)
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(fg42/system-get
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(fg42/system-cons-to '() :a '((x . 5)))
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:a))
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(defun fg42/system-register-cube (system name cube)
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"Add the given CUBE with the given NAME to the SYSTEM."
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(fg42/system-cons-to system :cubes (cons name cube)))
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(defmacro defsystem (name props &rest body)
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"Define a system with the given NAME, PROPS and BODY."
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(declare (indent 1))
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`(defun ,name ()
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(if ,props
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(lambda (___system___)
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(funcall
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(fg42/cube-compose ,@body)
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(seq-reduce
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(lambda (system pair)
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(fg42/system-cons (car pair) (cadr pair)))
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(seq-partition ,props 2)
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___system___)))
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(fg42/cube-compose ,@body))))
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(provide 'fg42/system/core)
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;;; core.el ends here
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