45 lines
1.3 KiB
EmacsLisp
45 lines
1.3 KiB
EmacsLisp
;; This library provides some basic means to create a new FG42 extensions
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(require 'cl-lib)
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;; Variables -----------------------------
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(defvar activated-extensions ()
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"A list of all activated extensions.")
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(defvar disabled-abilities (make-hash-table)
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"A hash of all the disabled abilities")
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;; Structures -----------------------------
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(cl-defstruct fg42-extension
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"Each FG42 extension should implement a copy of this structure."
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name
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(version nil)
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;; Callbacks
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(on-initialize nil)
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(on-load))
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;; Functions ------------------------------
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(defun active-ability? (name)
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"Return t if ability was not in disabled-abilities."
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(if (gethash name disabled-abilities) nil t))
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(defmacro ability (name deps &rest body)
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"Define an ability with the given name.
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*deps* should be a list of abilities with the defined ability dependens
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to them.
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*body* is a block of code which will run as the ability initializer code."
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`(progn
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(message "00000 %s" (active-ability? (intern ,(symbol-name name))))
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(if (active-ability? (intern ,(symbol-name name)))
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(if (null (delq t (mapcar 'active-ability? ,deps)))
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,@body))))
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(defmacro extension (name &rest args)
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"A simple DSL to define new fg42 extension."
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`(setq ,name (apply 'make-fg42-extension :name ,(symbol-name name) (quote ,args))))
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(provide 'fg42/extension)
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