b7df68c436
LICENSE: - Added GNU General Public License v3.0 - Updated README.org to reflect GPL 3.0 ROADMAP: - Complete rewrite to reflect actual project state - Removed croatoan/ncurses/Yoga FFI references - Marked all 11 existing versions DONE - Added v0.12.0-0.14.0 for new features (detection, pipeline, mouse) DETECTION (v0.12.0): - detect-backend: auto-detect modern vs simple backend - detect-backend-by-env: check COLORTERM env var - detect-backend-by-tty: check interactive-stream-p - detect-backend-by-da1: query terminal via ESC[c (best-effort) - *detected-backend* cache for zero-cost subsequent calls - Added detection.lisp to ASDF and package exports - Added 2 new tests (360 total, all passing) - demo.lisp updated to use detect-backend ORG BACKPORT (pre-existing fixes synced): - dialog.org: render-dialog/render-toast fixes, class initforms - scrollbox-tabbar.org: background-element -> bright-black, remove duplicate render - select.org: remove duplicate render export - text-input.org: remove duplicate %split-string, undo overflow fix - layout-engine.org: quoted-literal -> list constructors, normalize-box rewrite - mouse.org: add missing exports, fix test
63 lines
3.1 KiB
Common Lisp
63 lines
3.1 KiB
Common Lisp
(in-package :cl-tty.backend)
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;;; ─── Detection cache ────────────────────────────────────────────────────────
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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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;;; ─── Environment probe ──────────────────────────────────────────────────────
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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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;;; ─── TTY probe ──────────────────────────────────────────────────────────────
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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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;;; ─── DA1 terminal query ─────────────────────────────────────────────────────
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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 *query-io*)
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(force-output *query-io*)
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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 *query-io*)
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do (vector-push-extend (read-char-no-hang *query-io*) 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 kitty terminal response code.
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Returns T if terminal reports kitty compatibility codes."
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(let ((response (query-terminal (format nil "~C[c" #\Esc))))
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(when response
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;; DA1 response format: ESC [ ? digits ; digits c
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;; Kitty reports code 62 in the response
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(search "?62" response))))
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;;; ─── Orchestrator ───────────────────────────────────────────────────────────
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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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(make-modern-backend)
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(make-simple-backend)))))
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