2b6fc32425
B1: modern-backend now inherits from backend (was standalone class)
B2: draw-rect y-position bug — loop now tracks row offset
B3: Layout module added to ASDF system definition
I1: 6 smoke tests replaced with behavioral tests (captured output)
I3: 6 edge case tests: empty, single-child, zero-size, deep
nesting, large padding, negative grow
Also fixed:
- Added missing make-simple-backend constructor to simple.lisp
- Added in-package to classes.lisp and simple.lisp (SBCL's load
restores *package* after each load, breaking batch-mode loading)
70 lines
2.3 KiB
Common Lisp
70 lines
2.3 KiB
Common Lisp
(in-package :cl-tui.backend)
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(defclass simple-backend (backend)
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((output-stream :initform *standard-output*
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:initarg :output-stream
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:accessor backend-output-stream)))
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(defun make-simple-backend (&key output-stream)
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(make-instance 'simple-backend
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:output-stream (or output-stream *standard-output*)))
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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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