c77c6b9d02
Now tangles to modern.lisp + modern-tests.lisp. Deleted hand-written originals and regenerated from org — GREEN.
544 lines
21 KiB
Org Mode
544 lines
21 KiB
Org Mode
#+TITLE: Modern Backend
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#+STARTUP: content
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#+FILETAGS: :cl-tty:backend:
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* Overview
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The modern backend provides full-featured terminal rendering using raw
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escape sequences. It supports truecolor 24-bit color, OSC 8 hyperlinks,
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DECICM synchronized updates, SGR mouse tracking, kitty keyboard protocol,
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and Unicode box-drawing characters (single, double, rounded).
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All rendering functions produce CSI/OSC escape sequences directly — no
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ncurses, no terminfo, no FFI. Color resolution handles named colors
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(~:red~, ~:blue~, etc.), hex strings (~"#FFD700"~), and semantic theme
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roles (~:accent~, ~:error~) via the ~*theme-colors*~ hash table.
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* Contract
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** Color and attribute helpers
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- ~(hex-to-rgb hex)~ → (values r g b) — parse "#RRGGBB" or "#RGB"
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- ~(sgr-fg color)~ → escape string — foreground color escape
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- ~(sgr-bg color)~ → escape string — background color escape
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- ~(sgr-attr attr)~ → escape string — attribute escape (bold, italic, etc.)
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** Cursor helpers
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- ~(cursor-move-escape x y)~ → escape string — CSI cursor position
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- ~(cursor-style-escape shape blink)~ → escape string — DECSTR cursor shape
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** Sync and link helpers
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- ~(decicm-begin)~ → escape string — enable synchronized updates
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- ~(decicm-end)~ → escape string — disable synchronized updates
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- ~(osc8-link url text)~ → escape string — OSC 8 hyperlink wrapper
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** Border helpers
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- ~(border-char style pos)~ → string — Unicode box-drawing character
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** Modern backend class
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- ~(make-modern-backend &key output-stream)~ → modern-backend
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- Implements all ~backend~ protocol methods with escape sequences
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* Tests
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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(defpackage :cl-tty-modern-backend-test
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(:use :cl :fiveam :cl-tty.backend)
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(:export #:run-tests))
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(in-package :cl-tty-modern-backend-test)
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(def-suite modern-backend-suite :description "Modern backend tests")
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(in-suite modern-backend-suite)
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(defun run-tests ()
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(let ((result (run 'modern-backend-suite)))
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(fiveam:explain! result)
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(uiop:quit 0)))
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;; ── Constructor ────────────────────────────────────────────────
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(test make-modern-backend-creates
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"make-modern-backend returns a modern-backend instance"
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(let ((b (make-modern-backend)))
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(is (typep b 'cl-tty.backend::modern-backend))))
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;; ── Escape Generation ──────────────────────────────────────────
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(test sgr-truecolor-foreground
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"SGR truecolor foreground escape is correct"
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(is (equal (cl-tty.backend::sgr-fg "#FFD700")
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(format nil "~C[38;2;255;215;0m" #\Esc))))
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(test sgr-truecolor-background
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"SGR truecolor background escape is correct"
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(is (equal (cl-tty.backend::sgr-bg "#1a1b26")
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(format nil "~C[48;2;26;27;38m" #\Esc))))
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(test sgr-named-colors
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"SGR named colors resolve to 8-color codes"
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(is (equal (cl-tty.backend::sgr-fg :red)
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(format nil "~C[31m" #\Esc)))
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(is (equal (cl-tty.backend::sgr-bg :blue)
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(format nil "~C[44m" #\Esc))))
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(test sgr-bold-italic
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"SGR attribute escapes are correct"
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(is (equal (cl-tty.backend::sgr-attr :bold) (format nil "~C[1m" #\Esc)))
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(is (equal (cl-tty.backend::sgr-attr :italic) (format nil "~C[3m" #\Esc)))
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(is (equal (cl-tty.backend::sgr-attr :underline) (format nil "~C[4m" #\Esc)))
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(is (equal (cl-tty.backend::sgr-attr :reset) (format nil "~C[0m" #\Esc))))
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;; ── Cursor ─────────────────────────────────────────────────────
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(test cursor-move-escape
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"cursor-move generates correct CSI escape"
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(let ((b (make-modern-backend)))
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(is (equal (cl-tty.backend::cursor-move-escape 5 10)
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(format nil "~C[11;6H" #\Esc)))))
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(test cursor-style-block
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"cursor-style :block generate correct escape"
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(let ((b (make-modern-backend)))
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(is (equal (cl-tty.backend::cursor-style-escape :block nil)
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(format nil "~C[2 q" #\Esc)))))
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(test cursor-style-bar
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"cursor-style :bar generate correct escape"
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(let ((b (make-modern-backend)))
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(is (equal (cl-tty.backend::cursor-style-escape :bar nil)
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(format nil "~C[6 q" #\Esc)))))
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(test cursor-style-underline-blink
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"cursor-style :underline with blink"
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(let ((b (make-modern-backend)))
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(is (equal (cl-tty.backend::cursor-style-escape :underline t)
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(format nil "~C[5 q" #\Esc)))))
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;; ── Synchronization ────────────────────────────────────────────
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(test decicm-escapes
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"DECICM synchronized update escapes"
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(is (equal (cl-tty.backend::decicm-begin) (format nil "~C[?2026h" #\Esc)))
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(is (equal (cl-tty.backend::decicm-end) (format nil "~C[?2026l" #\Esc))))
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;; ── OSC 8 Hyperlinks ──────────────────────────────────────────
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(test osc8-escape
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"OSC 8 hyperlink escape wraps text"
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(is (equal (cl-tty.backend::osc8-link "http://example.com" "click here")
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(format nil "~C]8;;http://example.com~C\\\\click here~C]8;;~C\\\\"
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#\Esc #\Esc #\Esc #\Esc))))
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;; ── Hex Parsing ────────────────────────────────────────────────
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(test hex-color-parsing
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"hex-to-rgb parses valid hex colors"
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(multiple-value-bind (r g b) (cl-tty.backend::hex-to-rgb "#FFD700")
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(is (= r 255))
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(is (= g 215))
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(is (= b 0))))
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(test hex-color-black
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"hex-to-rgb parses black"
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(multiple-value-bind (r g b) (cl-tty.backend::hex-to-rgb "#000000")
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(is (= r 0))
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(is (= g 0))
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(is (= b 0))))
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(test hex-color-short-form
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"hex-to-rgb parses 3-digit hex"
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(multiple-value-bind (r g b) (cl-tty.backend::hex-to-rgb "#F00")
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(is (= r 255))
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(is (= g 0))
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(is (= b 0))))
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;; ── Border Characters ──────────────────────────────────────────
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(test border-char-rounded
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"modern-border-char returns Unicode box-drawing for rounded style"
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(is (equal (cl-tty.backend::border-char :rounded :top-left) "╭"))
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(is (equal (cl-tty.backend::border-char :rounded :horizontal) "─"))
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(is (equal (cl-tty.backend::border-char :rounded :vertical) "│"))
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(is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯")))
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(test border-char-double
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"modern-border-char returns double-line chars"
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(is (equal (cl-tty.backend::border-char :double :top-left) "╔"))
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(is (equal (cl-tty.backend::border-char :double :horizontal) "═"))
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(is (equal (cl-tty.backend::border-char :double :vertical) "║")))
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#+END_SRC
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* Implementation
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** Color and attribute helpers
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~hex-to-rgb~ parses hex color strings into (r g b) triplets. Handles
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both 6-digit (fully specified) and 3-digit (shorthand) formats.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(in-package :cl-tty.backend)
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(defun hex-to-rgb (hex)
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"Parse a hex color string like \"#FFD700\" into (values r g b).
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Also handles 3-digit hex like \"#F00\" (expands to \"#FF0000\")."
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(let ((clean (string-trim '(#\# #\Space) hex)))
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(if (= (length clean) 3)
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;; Expand 3-digit: #F00 -> #FF0000
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(let* ((r (parse-integer (subseq clean 0 1) :radix 16 :junk-allowed t))
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(g (parse-integer (subseq clean 1 2) :radix 16 :junk-allowed t))
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(b (parse-integer (subseq clean 2 3) :radix 16 :junk-allowed t)))
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(values (+ r (* r 16)) (+ g (* g 16)) (+ b (* b 16))))
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(values (parse-integer (subseq clean 0 2) :radix 16 :junk-allowed t)
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(parse-integer (subseq clean 2 4) :radix 16 :junk-allowed t)
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(parse-integer (subseq clean 4 6) :radix 16 :junk-allowed t)))))
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#+END_SRC
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Named color mapping and theme color store:
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defparameter *named-colors*
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'((:black . 0) (:red . 1) (:green . 2) (:yellow . 3)
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(:blue . 4) (:magenta . 5) (:cyan . 6) (:white . 7)))
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(defvar *theme-colors* (make-hash-table :test 'eq)
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"Hash table mapping theme keywords to hex color strings.
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Populated by the theme system's load-preset. Checked by sgr-fg/sgr-bg
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as a fallback when a keyword is not in *named-colors*.")
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#+END_SRC
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~sgr-fg~ and ~sgr-bg~ produce the actual escape sequences. The
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resolution chain is: hex → named color → theme semantic role → empty.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defun sgr-fg (color)
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"Return SGR foreground escape for COLOR."
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(if (null color) ""
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(cond ((and (stringp color) (char= (char color 0) #\#))
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(multiple-value-bind (r g b) (hex-to-rgb color)
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(format nil "~C[38;2;~d;~d;~dm" #\Esc r g b)))
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((keywordp color)
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(let ((index (cdr (assoc color *named-colors*))))
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(if index
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(format nil "~C[~dm" #\Esc (+ 30 index))
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(let ((hex (gethash color *theme-colors*)))
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(if hex
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(multiple-value-bind (r g b) (hex-to-rgb hex)
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(format nil "~C[38;2;~d;~d;~dm" #\Esc r g b))
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"")))))
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(t ""))))
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#+END_SRC
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defun sgr-bg (color)
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"Return SGR background escape for COLOR."
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(if (null color) ""
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(cond ((and (stringp color) (char= (char color 0) #\#))
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(multiple-value-bind (r g b) (hex-to-rgb color)
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(format nil "~C[48;2;~d;~d;~dm" #\Esc r g b)))
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((keywordp color)
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(let ((index (cdr (assoc color *named-colors*))))
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(if index
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(format nil "~C[~dm" #\Esc (+ 40 index))
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(let ((hex (gethash color *theme-colors*)))
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(if hex
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(multiple-value-bind (r g b) (hex-to-rgb hex)
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(format nil "~C[48;2;~d;~d;~dm" #\Esc r g b))
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"")))))
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(t ""))))
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#+END_SRC
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Attribute codes map keywords to SGR numbers:
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defparameter *sgr-attr-codes*
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'((:bold . 1) (:dim . 2) (:italic . 3) (:underline . 4)
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(:blink . 5) (:reverse . 7) (:reset . 0)))
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(defun sgr-attr (attr)
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"Return SGR attribute escape for ATTR keyword."
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(let ((code (cdr (assoc attr *sgr-attr-codes*))))
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(if code
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(format nil "~C[~dm" #\Esc code)
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"")))
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#+END_SRC
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** Cursor escapes
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defun cursor-move-escape (x y)
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"Return CSI escape to move cursor to (x, y), 1-indexed."
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(format nil "~C[~d;~dH" #\Esc (1+ y) (1+ x)))
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(defun cursor-style-escape (shape blink)
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"Return DECSTR escape for cursor shape."
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(let* ((base (case shape
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(:block 2) (:underline 4) (:bar 6)
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(t 2)))
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(code (if blink (1+ base) base)))
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(format nil "~C[~d q" #\Esc code)))
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#+END_SRC
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** Sync and link escapes
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defun decicm-begin ()
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"Return escape to enable synchronized updates."
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(format nil "~C[?2026h" #\Esc))
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(defun decicm-end ()
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"Return escape to disable synchronized updates."
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(format nil "~C[?2026l" #\Esc))
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(defun osc8-link (url text)
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"Wrap TEXT in an OSC 8 hyperlink to URL."
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(format nil "~C]8;;~A~C\\\\~A~C]8;;~C\\\\"
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#\Esc url #\Esc text #\Esc #\Esc))
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#+END_SRC
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** Border characters
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defparameter *border-chars*
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'(((:single :top-left) . "┌") ((:single :top-right) . "┐")
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((:single :bottom-left) . "└") ((:single :bottom-right) . "┘")
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((:single :horizontal) . "─") ((:single :vertical) . "│")
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((:double :top-left) . "╔") ((:double :top-right) . "╗")
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((:double :bottom-left) . "╚") ((:double :bottom-right) . "╝")
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((:double :horizontal) . "═") ((:double :vertical) . "║")
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((:rounded :top-left) . "╭") ((:rounded :top-right) . "╮")
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((:rounded :bottom-left) . "╰") ((:rounded :bottom-right) . "╯")
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((:rounded :horizontal) . "─") ((:rounded :vertical) . "│")))
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(defun border-char (style pos)
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"Return the Unicode box-drawing character for STYLE at POS."
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(let ((char (cdr (assoc (list style pos) *border-chars* :test #'equal))))
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(or char (if (member pos '(:horizontal :vertical))
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(case pos (:horizontal "─") (:vertical "│"))
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"+"))))
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#+END_SRC
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** Modern backend class
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defclass modern-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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(in-sync-p :initform nil :accessor in-sync-p)))
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(defun make-modern-backend (&key color-palette output-stream)
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(declare (ignore color-palette))
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(make-instance 'modern-backend :output-stream (or output-stream *standard-output*)))
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#+END_SRC
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** Lifecycle
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~initialize-backend~ enters the alt screen, enables mouse tracking,
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bracketed paste, and kitty keyboard protocol. ~shutdown-backend~
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restores everything.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defmethod initialize-backend ((b modern-backend))
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(backend-write b (format nil "~C[?1049h" #\Esc)) ; alt screen
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(backend-write b (format nil "~C[?1000h" #\Esc)) ; mouse basic
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(backend-write b (format nil "~C[?1002h" #\Esc)) ; mouse drag
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(backend-write b (format nil "~C[?1006h" #\Esc)) ; SGR mouse
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(backend-write b (format nil "~C[?2004h" #\Esc)) ; bracketed paste
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(backend-write b (format nil "~C[?u" #\Esc)) ; kitty keyboard
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(cursor-hide b)
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(finish-output (backend-output-stream b))
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b)
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(defmethod shutdown-backend ((b modern-backend))
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(cursor-show b)
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(backend-write b (format nil "~C[?u" #\Esc))
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(backend-write b (format nil "~C[?2004l" #\Esc))
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(backend-write b (format nil "~C[?1006l" #\Esc))
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(backend-write b (format nil "~C[?1002l" #\Esc))
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(backend-write b (format nil "~C[?1000l" #\Esc))
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(backend-write b (format nil "~C[?1049l" #\Esc)) ; normal screen
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(finish-output (backend-output-stream b))
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(values))
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#+END_SRC
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** Backend-size via ioctl
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Uses TIOCGWINSZ to query actual terminal dimensions. The alien-sap
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wrapper ensures compatibility across SBCL versions.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defmethod backend-size ((b modern-backend))
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(let* ((+tiocgwinsz+ 21523) ; 0x5413 on Linux
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(winsize (sb-alien:make-alien sb-alien:unsigned-short 4)))
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(unwind-protect
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(progn
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(sb-unix:unix-ioctl (sb-sys:fd-stream-fd (backend-output-stream b))
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+tiocgwinsz+
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(sb-alien:alien-sap winsize))
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(values (sb-alien:deref winsize 1) ;; cols
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(sb-alien:deref winsize 0))) ;; rows
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(sb-alien:free-alien winsize))))
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#+END_SRC
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** Capability query and write
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defmethod backend-write ((b modern-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 capable-p ((b modern-backend) feature)
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(member feature '(:truecolor :osc8 :sync :mouse
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:bracketed-paste :cursor-style
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:kitty-keyboard)))
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#+END_SRC
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** Drawing
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~draw-text~ combines cursor positioning, SGR colors, attributes, the
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text itself, and a reset into a single string. This minimizes ioctl
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calls — one write per draw operation.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defmethod draw-text ((b modern-backend) x y string fg bg
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&key bold italic underline reverse dim blink)
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(let ((parts (list (cursor-move-escape x y)
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(sgr-fg fg) (sgr-bg bg)
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(when bold (sgr-attr :bold))
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(when italic (sgr-attr :italic))
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(when underline (sgr-attr :underline))
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(when reverse (sgr-attr :reverse))
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(when dim (sgr-attr :dim))
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(when blink (sgr-attr :blink))
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string
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(sgr-attr :reset))))
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(backend-write b (apply #'concatenate 'string parts))))
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#+END_SRC
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~draw-border~ builds the full border as three string parts (top with
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optional title, mid with sides, bottom) and writes them with minimal
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output calls.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defmethod draw-border ((b modern-backend) x y width height
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&key style fg bg title title-align)
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(let* ((s (or style :single))
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(tl (border-char s :top-left))
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|
(tr (border-char s :top-right))
|
|
(bl (border-char s :bottom-left))
|
|
(br (border-char s :bottom-right))
|
|
(h (border-char s :horizontal))
|
|
(v (border-char s :vertical))
|
|
(fg-esc (sgr-fg fg))
|
|
(bg-esc (sgr-bg bg))
|
|
(reset (sgr-attr :reset))
|
|
(inner-width (- width 2))
|
|
(hc (char h 0))
|
|
(top (if (and title (plusp (length title)))
|
|
(let* ((align (or title-align :left))
|
|
(max-tlen (- inner-width 2))
|
|
(tlen (min (length title) max-tlen))
|
|
(trunc-title (subseq title 0 tlen)))
|
|
(ecase align
|
|
(:left
|
|
(let ((right-hyphens (- inner-width tlen 2)))
|
|
(concatenate 'string
|
|
fg-esc bg-esc tl (string #\Space)
|
|
trunc-title (string #\Space)
|
|
(make-string (max 0 right-hyphens) :initial-element hc)
|
|
tr reset (string #\Newline))))
|
|
(:center
|
|
(let* ((total-pad (- inner-width tlen))
|
|
(left-pad (floor total-pad 2))
|
|
(right-pad (- total-pad left-pad)))
|
|
(concatenate 'string
|
|
fg-esc bg-esc tl
|
|
(make-string left-pad :initial-element hc)
|
|
trunc-title
|
|
(make-string right-pad :initial-element hc)
|
|
tr reset (string #\Newline))))))
|
|
(concatenate 'string
|
|
fg-esc bg-esc tl
|
|
(make-string inner-width :initial-element hc)
|
|
tr reset (string #\Newline))))
|
|
(mid (concatenate 'string
|
|
fg-esc bg-esc v
|
|
(make-string inner-width :initial-element #\Space)
|
|
v reset (string #\Newline)))
|
|
(bot (concatenate 'string
|
|
fg-esc bg-esc bl
|
|
(make-string inner-width :initial-element hc)
|
|
br reset)))
|
|
(backend-write b top)
|
|
(loop repeat (- height 2) do (backend-write b mid))
|
|
(backend-write b bot)))
|
|
#+END_SRC
|
|
|
|
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
|
(defmethod draw-rect ((b modern-backend) x y width height &key bg)
|
|
(let* ((bg-esc (sgr-bg bg))
|
|
(reset (sgr-attr :reset))
|
|
(line (concatenate 'string
|
|
bg-esc
|
|
(make-string width :initial-element #\Space)
|
|
reset (string #\Newline))))
|
|
(loop :for row :from 0 :below height :do
|
|
(backend-write b (cursor-move-escape x (+ y row)))
|
|
(backend-write b line))))
|
|
|
|
(defmethod draw-link ((b modern-backend) x y string url
|
|
&key fg bg)
|
|
(let ((parts (list (cursor-move-escape x y)
|
|
(sgr-fg fg) (sgr-bg bg)
|
|
(osc8-link url string)
|
|
(sgr-attr :reset))))
|
|
(backend-write b (apply #'concatenate 'string parts))))
|
|
|
|
(defmethod draw-ellipsis ((b modern-backend) x y width
|
|
&key fg bg)
|
|
(declare (ignore width))
|
|
(let ((dots "..."))
|
|
(draw-text b x y dots fg bg)))
|
|
#+END_SRC
|
|
|
|
** Cursor and input methods
|
|
|
|
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
|
(defmethod cursor-move ((b modern-backend) x y)
|
|
(backend-write b (cursor-move-escape x y)))
|
|
|
|
(defmethod cursor-hide ((b modern-backend))
|
|
(backend-write b (format nil "~C[?25l" #\Esc)))
|
|
|
|
(defmethod cursor-show ((b modern-backend))
|
|
(backend-write b (format nil "~C[?25h" #\Esc)))
|
|
|
|
(defmethod cursor-style ((b modern-backend) shape &key blink)
|
|
(backend-write b (cursor-style-escape shape blink)))
|
|
|
|
(defmethod enable-mouse ((b modern-backend))
|
|
(backend-write b (format nil "~C[?1000h" #\Esc))
|
|
(backend-write b (format nil "~C[?1002h" #\Esc))
|
|
(backend-write b (format nil "~C[?1006h" #\Esc))
|
|
(finish-output (backend-output-stream b)))
|
|
|
|
(defmethod enable-bracketed-paste ((b modern-backend))
|
|
(backend-write b (format nil "~C[?2004h" #\Esc))
|
|
(finish-output (backend-output-stream b)))
|
|
|
|
(defmethod begin-sync ((b modern-backend))
|
|
(setf (in-sync-p b) t)
|
|
(backend-write b (decicm-begin)))
|
|
|
|
(defmethod end-sync ((b modern-backend))
|
|
(setf (in-sync-p b) nil)
|
|
(backend-write b (decicm-end))
|
|
(finish-output (backend-output-stream b)))
|
|
#+END_SRC
|