;;; Code:
+;;; Initialization
+
+; Specifier tag 'printer which matches printers
+(define-specifier-tag 'printer (function device-printer-p))
+
+; Specifier tag 'display which matches displays
+(define-specifier-tag 'display (function
+ (lambda (device)
+ (not (device-printer-p device)))))
+
+;;; Functions
+
(defun device-list ()
"Return a list of all devices."
(apply 'nconc (mapcar 'console-device-list (console-list))))
Value is `tty' for a tty device (a character-only terminal),
`x' for a device that is a screen on an X display,
`ns' for a device that is a NeXTstep connection (not yet implemented),
-`mswindows' for a device that is a Windows or Windows NT connection,
-`pc' for a device that is a direct-write MS-DOS screen (not yet implemented),
+`mswindows' for a device that is a MS Windows workstation,
+`msprinter' for a device that is a MS Windows printer connection,
`stream' for a stream device (which acts like a stdio stream), and
`dead' for a deleted device."
(or device (setq device (selected-device)))
(or device (setq device (selected-device)))
(console-on-window-system-p (device-console device)))
+(defun call-device-method (name device &rest args)
+ "Call a DEVICE-specific function with the generic name NAME.
+If DEVICE is not provided then the selected device is used."
+ (or device (setq device (selected-device)))
+ (or (symbolp name) (error "function name must be a symbol"))
+ (let ((devmeth (intern (concat (symbol-name
+ (device-type device)) "-" (symbol-name name)))))
+ (if (functionp devmeth)
+ (if args
+ (apply devmeth args)
+ (funcall devmeth))
+ nil)))
+
+(defmacro define-device-method (name &optional docstring)
+ "Define NAME to be a device method."
+ `(defun ,name (&rest arglist) ,docstring
+ (apply 'call-device-method (quote ,name) nil arglist)))
+
+(defmacro define-device-method* (name &optional docstring)
+ "Define NAME to be a device method."
+ `(defun* ,name (&rest arglist) ,docstring
+ (apply 'call-device-method (quote ,name) nil arglist)))
+
(defalias 'valid-device-type-p 'valid-console-type-p)
(defalias 'device-type-list 'console-type-list)
(defalias 'device-pixel-depth 'device-bitplanes)