Amr Gharbeia
e8b37f6268
- backend-size now uses TIOCGWINSZ ioctl (like modern-backend) - draw-text adds \033[row;colH CSI cursor positioning - draw-rect fills background with space characters at position - draw-border uses CSI positioning instead of raw newlines+spaces - Added cursor-hide/cursor-show, cursor-move, initialize/shutdown - Detection: broader DA1 check (any ANSI response, not just kitty) - Detection: added TERM-based fallback for modern terminal detection
67 lines
2.8 KiB
Common Lisp
67 lines
2.8 KiB
Common Lisp
(in-package :cl-tty.backend)
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(defvar *detected-backend* nil
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"Cached backend instance from detect-backend. Nil = not yet detected.")
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(defun detect-backend-by-env ()
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"Check COLORTERM environment variable for modern terminal support.
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Returns :modern if COLORTERM contains 'truecolor' or '24bit', nil otherwise."
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(let ((colorterm (sb-ext:posix-getenv "COLORTERM")))
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(when (and colorterm
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(or (search "truecolor" colorterm :test #'char-equal)
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(search "24bit" colorterm :test #'char-equal)))
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:modern)))
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(defun detect-backend-by-tty ()
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"Check if stdout is a real terminal (not a pipe/redirect).
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Returns T if stdout is interactive, nil otherwise."
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(interactive-stream-p *standard-output*))
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(defun query-terminal (query &optional (timeout 0.1))
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"Send QUERY string to terminal and return any response received within
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TIMEOUT seconds. Returns the response string, or nil if no response."
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(write-string query *standard-output*)
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(force-output *standard-output*)
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(sleep timeout)
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(let ((response (make-array 0 :element-type 'character
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:fill-pointer 0 :adjustable t)))
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(loop while (listen *standard-input*)
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do (vector-push-extend (read-char-no-hang *standard-input*) response))
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(when (plusp (length response))
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response)))
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(defun detect-backend-by-da1 ()
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"Send DA1 (ESC[c) query and check for any terminal response.
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Returns T if the terminal responds to DA1 (indicating an ANSI-compatible terminal)."
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(let ((response (query-terminal (format nil "~C[c" (code-char 27)))))
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(when response
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;; Any DA1 response (ESC [ ? digits ... c) means the terminal
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;; understands ANSI escape sequences — good enough for modern-backend
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(> (length response) 0))))
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(defun detect-backend-by-term ()
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"Check TERM environment variable for modern terminal types.
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Returns :modern if TERM contains xterm, tmux, screen, kitty,
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alacritty, foot, wezterm, or ghostty."
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(let ((term (sb-ext:posix-getenv "TERM")))
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(when term
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;; Known non-modern terms
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(unless (or (string-equal term "dumb")
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(string-equal term "dump")
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(string-equal term "emacs")
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(search "52" term)) ; VT52 — no ANSI
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:modern))))
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(defun detect-backend ()
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"Auto-detect the appropriate backend for the current terminal.
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Returns a backend instance (modern-backend or simple-backend).
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Result is cached in *detected-backend* for subsequent calls."
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(or *detected-backend*
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(setf *detected-backend*
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(if (and (detect-backend-by-tty)
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(or (eql (detect-backend-by-env) :modern)
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(detect-backend-by-da1)
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(eql (detect-backend-by-term) :modern)))
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(make-modern-backend)
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(make-simple-backend)))))
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