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|
;;; systemd-codegen.el --- D-Bus Introspection -*- lexical-binding: t; -*-
;; Copyright (C) 2016 Free Software Foundation, Inc.
;; Author: Mario Lang <mlang@delysid.org>
;; Keywords:
;; 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 <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library is used to automatically generate D-Bus bindings for systemd
;; and related components via introspection.
;;
;; The macro `systemd-codegen-define' can be used to generate Lisp code according
;; to the currently available introspection data. This can be useful for
;; development.
;;
;; To avoid a dependency on systemd at compile time, `systemd-codegen-to-string'
;; is provided to statically generate all the Lisp code for the currently running
;; version of systemd.
;;
;; `systemd-codegen-to-string' is used to generate the bulk of the content of
;; systemd.el.
;;; Code:
(require 'cl-lib)
(require 'dbus)
(defvar systemd-codegen-interfaces
'(("org.freedesktop.systemd1.Manager"
:prefix "systemd"
:interface systemd-dbus-interface-manager)
("org.freedesktop.systemd1.Automount"
:prefix "systemd-automount"
:interface systemd-dbus-interface-automount)
("org.freedesktop.systemd1.BusName"
:prefix "systemd-bus-name"
:interface systemd-dbus-interface-bus-name)
("org.freedesktop.systemd1.Device"
:prefix "systemd-device"
:interface systemd-dbus-interface-device)
("org.freedesktop.systemd1.Mount"
:prefix "systemd-mount"
:interface systemd-dbus-interface-mount)
("org.freedesktop.systemd1.Path"
:prefix "systemd-path"
:interface systemd-dbus-interface-path)
("org.freedesktop.systemd1.Service"
:prefix "systemd-service"
:interface systemd-dbus-interface-service)
("org.freedesktop.systemd1.Scope"
:prefix "systemd-scope"
:interface systemd-dbus-interface-scope)
("org.freedesktop.systemd1.Slice"
:prefix "systemd-slice"
:interface systemd-dbus-interface-slice)
("org.freedesktop.systemd1.Socket"
:prefix "systemd-socket"
:interface systemd-dbus-interface-socket)
("org.freedesktop.systemd1.Swap"
:prefix "systemd-swap"
:interface systemd-dbus-interface-swap)
("org.freedesktop.systemd1.Target"
:prefix "systemd-target"
:interface systemd-dbus-interface-target)
("org.freedesktop.systemd1.Timer"
:prefix "systemd-timer"
:interface systemd-dbus-interface-timer)
("org.freedesktop.systemd1.Unit"
:prefix "systemd-unit"
:interface systemd-dbus-interface-unit)
("org.freedesktop.login1.Manager"
:prefix "systemd-logind"
:interface systemd-dbus-interface-logind-mamanger)
("org.freedesktop.login1.Seat"
:prefix "systemd-logind-seat"
:interface systemd-dbus-interface-logind-seat)
("org.freedesktop.login1.Session"
:prefix "systemd-logind-session"
:interface systemd-dbus-interface-logind-session)
("org.freedesktop.login1.User"
:prefix "systemd-logind-user"
:interface systemd-dbus-interface-logind-user)
("org.freedesktop.network1.Manager"
:prefix "systemd-networkd"
:interface systemd-dbus-interface-networkd-manager)
("org.freedesktop.network1.Link"
:prefix "systemd-networkd-link"
:interface systemd-dbus-interface-networkd-link)
("org.freedesktop.network1.Network"
:prefix "systemd-networkd-network"
:interface systemd-dbus-interface-networkd-network)
("org.freedesktop.resolve1.Manager"
:prefix "systemd-resolved"
:interface systemd-dbus-interface-resolved-manager)
("org.freedesktop.resolve1.Link"
:prefix "systemd-resolved-link"
:interface systemd-dbus-interface-resolved-link)
("org.freedesktop.hostname1"
:prefix "systemd-hostnamed"
:interface systemd-dbus-interface-hostnamed)
("org.freedesktop.locale1"
:prefix "systemd-localed"
:interface systemd-dbus-interface-localed)
("org.freedesktop.timedate1"
:prefix "systemd-timedated"
:interface systemd-dbus-interface-timedated)
("org.freedesktop.machine1.Manager"
:prefix "systemd-machined"
:interface systemd-dbus-interface-machined-mananger)
("org.freedesktop.machine1.Image"
:prefix "systemd-machined-image"
:interface systemd-dbus-interface-machined-image)
("org.freedesktop.machine1.Machine"
:prefix "systemd-machined-machine"
:interface systemd-dbus-interface-machined-machine)))
(defun systemd-codegen-introspect (service path &optional interfaces)
(let ((xml (dbus-introspect-xml :system service path)))
(dolist (item
(and (eq (car-safe xml) 'node)
(xml-node-children xml))
(sort interfaces (lambda (a b) (string-lessp (car a) (car b)))))
(cond
((and (listp item) (eq 'interface (car-safe item)))
(let* ((interface (xml-get-attribute-or-nil item 'name))
(interface-info (cdr (assoc interface systemd-codegen-interfaces)))
(prefix (plist-get interface-info :prefix))
(object-interface (not (string-match "\\(\\.Manager\\|1\\)$" interface)))
(service (pcase service
("org.freedesktop.systemd1" 'systemd-dbus-service)
(_ service)))
(path (pcase path
("/org/freedesktop/systemd1" 'systemd-dbus-path)
(_ path)))
forms)
(when (and prefix (not (assoc interface interfaces)))
(push `(defconst ,(plist-get interface-info :interface) ,interface) forms)
(setq
interfaces
(append
interfaces
(list
(cons
interface
(let ((interface (plist-get interface-info :interface)))
(dolist (interface-item (cddr item) (nreverse forms))
(cond
((eq 'property (car-safe interface-item))
(let* ((property (xml-get-attribute interface-item 'name))
(name (intern (concat prefix "-" property)))
(readwrite
(string-equal
"readwrite"
(xml-get-attribute interface-item 'access)))
(arglist `(bus
,@(when object-interface
'(path)))))
(push `(defun ,name ,arglist
,(if readwrite
"Use `setf' to set the value of this property."
"Read only property.")
(dbus-get-property
bus ,service
,(if object-interface 'path path)
,interface ,property))
forms)
(when readwrite
(push (list 'gv-define-setter name (cons 'value arglist)
(list '\`
(list 'dbus-set-property
'(\, bus)
service
(if object-interface
'(\, path)
path)
interface property
'(\, value))))
forms))))
((eq 'method (car-safe interface-item))
(let* ((method (xml-get-attribute interface-item 'name))
(name (intern (concat prefix "-" method)))
(args (cl-remove-if-not
(lambda (arg)
(string= "in"
(xml-get-attribute
arg 'direction)))
(xml-get-children interface-item 'arg)))
(arglist `(bus ,@(when object-interface '(path))
,@(when args '(&rest args)))))
(push `(defun ,name ,arglist
(,@(if args
'(apply #'dbus-call-method)
'(dbus-call-method))
bus ,service
,(if object-interface 'path path)
,interface ,method
,@(when args '(args))))
forms)))))))))))))
((and (listp item) (eq 'node (xml-node-name item)))
(let ((name (xml-get-attribute-or-nil item 'name)))
(setq interfaces (systemd-codegen-introspect
service (concat path "/" name) interfaces))))))))
(defmacro systemd-codegen-define (suffix)
(cons 'progn (cl-mapcan #'cdr (systemd-codegen-introspect
(concat "org.freedesktop." suffix)
(concat "/org/freedesktop/" suffix)))))
(defun systemd-codegen-to-string (suffix)
(with-temp-buffer
(pcase-dolist (`(,interface . ,forms)
(systemd-codegen-introspect
(concat "org.freedesktop." suffix)
(concat "/org/freedesktop/" suffix)))
(insert ";;; " interface "\n\n")
(dolist (form forms)
(pp form (current-buffer))
(insert "\n")))
(delete-char -1)
(emacs-lisp-mode)
(goto-char (point-min))
(while (re-search-forward "^(\\(defun\\|gv-define-setter\\)" nil t)
(goto-char (match-beginning 0))
(down-list 1) (forward-sexp 2) (delete-char 4) (up-list 1))
(goto-char (point-min))
(while (re-search-forward "(dbus-\\(get\\|set\\)-property" nil t)
(goto-char (match-beginning 0))
(down-list 1) (forward-sexp 4) (insert "\n") (up-list -1) (indent-sexp)
(up-list 1))
(goto-char (point-min))
(while (re-search-forward "(apply #'dbus-call-method" nil t)
(goto-char (match-beginning 0))
(down-list 1) (forward-sexp 5) (insert "\n") (up-list -1) (indent-sexp)
(up-list 1))
(goto-char (point-min))
(while (re-search-forward "(dbus-call-method" nil t)
(goto-char (match-beginning 0))
(down-list 1) (forward-sexp 4) (insert "\n") (up-list -1) (indent-sexp)
(up-list 1))
(buffer-string)))
(provide 'systemd-codegen)
;;; systemd-codegen.el ends here
|
