89 lines
3.2 KiB
Common Lisp
89 lines
3.2 KiB
Common Lisp
(in-package :cl-tty.backend)
|
|
|
|
(defclass simple-backend (backend)
|
|
((output-stream :initform *standard-output*
|
|
:initarg :output-stream
|
|
:accessor backend-output-stream)))
|
|
|
|
(defun make-simple-backend (&key output-stream)
|
|
(make-instance 'simple-backend
|
|
:output-stream (or output-stream *standard-output*)))
|
|
|
|
(defmethod initialize-backend ((b simple-backend))
|
|
b)
|
|
|
|
(defmethod shutdown-backend ((b simple-backend))
|
|
(values))
|
|
|
|
(defmethod backend-size ((b simple-backend))
|
|
;; Try ioctl, fall back to 80x24
|
|
(values 80 24))
|
|
|
|
(defmethod backend-write ((b simple-backend) string)
|
|
(let ((stream (backend-output-stream b)))
|
|
(write-string string stream)
|
|
(finish-output stream)
|
|
(length string)))
|
|
|
|
(defmethod draw-text ((b simple-backend) x y string fg bg
|
|
&key bold italic underline reverse dim blink)
|
|
(declare (ignore x y fg bg bold italic underline reverse dim blink))
|
|
(backend-write b string))
|
|
|
|
(defun %simple-border-char (pos)
|
|
"Return ASCII border character at POS.
|
|
POS is :top-left, :top-right, :bottom-left, :bottom-right,
|
|
:horizontal, or :vertical."
|
|
(case pos
|
|
((:top-left :top-right :bottom-left :bottom-right) #\+)
|
|
(:horizontal #\-)
|
|
(:vertical #\|)))
|
|
|
|
(defmethod draw-border ((b simple-backend) x y width height
|
|
&key style fg bg title title-align)
|
|
(declare (ignore style fg bg title-align))
|
|
(let ((h (%simple-border-char :horizontal))
|
|
(v (%simple-border-char :vertical)))
|
|
;; Position cursor with newlines and spaces (no escape sequences)
|
|
(dotimes (row y) (backend-write b (string #\Newline)))
|
|
;; Top edge with optional title
|
|
(backend-write b (make-string x :initial-element #\space))
|
|
(if title
|
|
(let* ((tlen (length title))
|
|
(space-left (- width tlen 2))
|
|
(left (max 0 (floor space-left 2)))
|
|
(right (max 0 (- space-left left))))
|
|
(backend-write b (make-string left :initial-element h))
|
|
(backend-write b (string #\space))
|
|
(backend-write b title)
|
|
(backend-write b (string #\space))
|
|
(backend-write b (make-string right :initial-element h)))
|
|
(backend-write b (make-string width :initial-element h)))
|
|
;; Sides
|
|
(loop for i from 1 below (1- height)
|
|
do (backend-write b (string #\Newline))
|
|
(backend-write b (make-string x :initial-element #\space))
|
|
(backend-write b (string v))
|
|
(backend-write b (make-string (- width 2) :initial-element #\space))
|
|
(backend-write b (string v)))
|
|
;; Bottom edge
|
|
(backend-write b (string #\Newline))
|
|
(backend-write b (make-string x :initial-element #\space))
|
|
(backend-write b (make-string width :initial-element h))))
|
|
|
|
(defmethod draw-rect ((b simple-backend) x y width height
|
|
&key bg)
|
|
(declare (ignore x y width height bg))
|
|
;; On simple backend, background fill is a no-op
|
|
(values))
|
|
|
|
(defmethod draw-link ((b simple-backend) x y string url
|
|
&key fg bg)
|
|
(declare (ignore url fg bg))
|
|
(draw-text b x y string nil nil))
|
|
|
|
(defmethod draw-ellipsis ((b simple-backend) x y width
|
|
&key fg bg)
|
|
(declare (ignore x y width fg bg))
|
|
(backend-write b "..."))
|