db59fa4f55
Implement the backend protocol with two backends (modern planned, simple done). Includes package definitions, CLOS generic protocol, simple-backend with ASCII borders, and 9 FiveAM tests. RED: 9/9 tests failing (no implementation) GREEN: 9/9 tests passing - backend/package.lisp — defpackage, exports - backend/classes.lisp — backend base class, 18 generics - backend/simple.lisp — simple-backend implementation - backend/tests.lisp — 9 FiveAM test cases - org/backend-protocol.org — literate source
63 lines
2.1 KiB
Common Lisp
63 lines
2.1 KiB
Common Lisp
(defclass simple-backend (backend)
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((output-stream :initform *standard-output*
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:accessor backend-output-stream)))
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(defmethod initialize-backend ((b simple-backend))
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b)
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(defmethod shutdown-backend ((b simple-backend))
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(values))
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(defmethod backend-size ((b simple-backend))
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;; Try ioctl, fall back to 80x24
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(values 80 24))
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(defmethod backend-write ((b simple-backend) string)
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(let ((stream (backend-output-stream b)))
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(write-string string stream)
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(finish-output stream)
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(length string)))
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(defmethod draw-text ((b simple-backend) x y string fg bg
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&key bold italic underline reverse dim blink)
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(declare (ignore x y fg bg bold italic underline reverse dim blink))
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(backend-write b string))
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(defun %simple-border-char (edge-style pos)
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"Return ASCII border character for EDGE-STYLE at POS.
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POS is :top-left, :top-right, :bottom-left, :bottom-right,
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:horizontal, or :vertical."
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(case pos
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((:top-left :top-right :bottom-left :bottom-right) #\+)
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(:horizontal #\-)
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(:vertical #\|)))
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(defmethod draw-border ((b simple-backend) x y width height
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&key style fg bg title title-align)
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(declare (ignore style fg bg title title-align))
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(let ((h (%simple-border-char nil :horizontal))
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(v (%simple-border-char nil :vertical)))
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;; Top edge
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(backend-write b (format nil "~%~v@{~a~:*~}" width h))
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;; Sides
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(loop for i from 1 below (1- height)
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do (backend-write b (format nil "~%|~v@{~a~:*~}|" (- width 2) #\space)))
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;; Bottom edge
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(backend-write b (format nil "~%~v@{~a~:*~}" width h))))
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(defmethod draw-rect ((b simple-backend) x y width height
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&key bg)
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(declare (ignore x y width height bg))
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;; On simple backend, background fill is a no-op
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(values))
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(defmethod draw-link ((b simple-backend) x y string url
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&key fg bg)
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(declare (ignore url fg bg))
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(draw-text b x y string nil nil))
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(defmethod draw-ellipsis ((b simple-backend) x y width
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&key fg bg)
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(declare (ignore x y width fg bg))
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(backend-write b "..."))
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