literate: restructure all 19 org files with per-function blocks and prose
Every function, defclass, defstruct, defgeneric, defmethod, defmacro, defvar, and defparameter in every org file now has its own #+BEGIN_SRC block with literate prose above it explaining the design reasoning. Block counts before → after: package.org: 1 → 7 container-package.org: 1 → 1 (prose expanded) dirty.org: 4 → 6 render.org: 10 → 25 theme.org: 6 → 19 box-renderable.org: 9 → 29 scrollbox.org: 8 → 26 tabbar.org: 5 → 10 backend-protocol.org: 8 → 66 modern-backend.org: 17 → 53 detection.org: 4 → 6 layout-engine.org: 9 → 36 framebuffer.org: 8 → 37 markdown-renderer.org:13 → 38 dialog.org: 17 → 23 (merged dual structure) mouse.org: 4 → 25 select.org: 12 → 30 slot.org: 4 → 12 text-input.org: 11 → 53 Total: ~153 blocks → ~502 blocks Bugs fixed during restructuring: - render.org: stray π character typo (backenπd → backend) - modern-backend.org: sgr-attr missing closing paren + #+END_SRC - detection.org: invalid #\Esc character reference - select.org: extra closing paren in select-visible-options All 13 test suites pass at 100%.
This commit is contained in:
Hermes Agent
@@ -9,7 +9,7 @@ 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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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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@@ -18,166 +18,281 @@ roles (~:accent~, ~:error~) via the ~*theme-colors*~ hash table.
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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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- ~(hex-to-rgb hex)~ (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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- ~(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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- ~(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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- ~(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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- ~(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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The test suite lives in =modern-tests.lisp= and uses FiveAM. Each test
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covers one logical behavior.
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** Package and setup
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The test package uses =cl-tty.backend= to access internal symbols for
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white-box testing of escape generation.
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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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#+END_SRC
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** Suite definition
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A single suite groups all modern backend tests.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Test runner
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The =run-tests= entry point is called by the CI test harness.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── Constructor ────────────────────────────────────────────────
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** Constructor test
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Verifies that =make-modern-backend= returns an instance of the correct
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class. This is the most basic smoke test for the backend factory.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── Escape Generation ──────────────────────────────────────────
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** SGR truecolor foreground escape
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Ensures a 6-digit hex string produces the correct 24-bit foreground
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escape sequence with red, green, and blue components in the right order.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** SGR truecolor background escape
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Same as foreground but uses the =48= background prefix instead of =38=.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** SGR named color resolution
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Verifies that keyword symbols like =:red= and =:blue= resolve to the
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standard 8-color SGR codes (=31= foreground, =44= background).
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** SGR attribute escapes
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Each attribute keyword (=:bold=, =:italic=, =:underline=, =:reset=)
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should map to the correct SGR number.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── Cursor ─────────────────────────────────────────────────────
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** Cursor move escape
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Verifies that =cursor-move-escape= produces a CSI =H= sequence with
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1-indexed row and column.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Cursor style block
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Verifies the DECSTR escape for a block cursor without blinking (code 2).
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Cursor style bar
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Verifies the DECSTR escape for a bar cursor without blinking (code 6).
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Cursor style underline with blink
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Verifies that =:underline= with =blink=t= produces code 5 (underline
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blinking), which is base 4 + blink offset 1.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── Synchronization ────────────────────────────────────────────
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** DECICM synchronized update escapes
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Confirms that =decicm-begin= and =decicm-end= produce =?2026h= and
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=?2026l= respectively.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── OSC 8 Hyperlinks ──────────────────────────────────────────
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** OSC 8 hyperlink escape
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Verifies the full OSC 8 wrapping: opening sequence with URL, the text,
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and the closing sequence. The FORMAT string uses ~~ for literal tilde
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and ~\\ for literal backslash.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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(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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#+END_SRC
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;; ── Hex Parsing ────────────────────────────────────────────────
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** Hex color parsing (gold)
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Verifies that ="#FFD700"= parses to (255, 215, 0).
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Hex color parsing (black)
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Verifies all-zero parsing.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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** Hex color parsing (3-digit short form)
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Verifies that ="#F00"= expands to ="#FF0000"= = (255, 0, 0).
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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#+END_SRC
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;; ── Border Characters ──────────────────────────────────────────
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** Border characters --- rounded style
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Confirms that =:rounded= style maps to the Unicode box-drawing
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characters for the four corners and edges.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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(is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯"))
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#+END_SRC
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** Border characters --- double style
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Confirms that =:double= style maps to double-line box-drawing characters.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
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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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(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
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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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both 6-digit (fully specified) and 3-digit (shorthand) formats. The
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3-digit form expands each hexit by duplicating it (=#F00= => =#FF0000=).
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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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@@ -197,21 +312,37 @@ both 6-digit (fully specified) and 3-digit (shorthand) formats.
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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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*** *named-colors*
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Maps keyword color names to 8-color SGR index values. Used as the
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primary lookup in =sgr-fg= and =sgr-bg= before falling back to the
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theme colors hash table.
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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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#+END_SRC
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*** *theme-colors*
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Hash table mapping semantic theme role keywords to hex color strings.
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Populated by the theme system's =load-preset=. When a keyword is not in
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=*named-colors*=, =sgr-fg= and =sgr-bg= consult this table as a
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fallback, enabling user themes to define custom color roles.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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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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*** sgr-fg
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~sgr-fg~ produces the SGR foreground escape sequence. Resolution chain:
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hex string => named color => semantic theme role => empty string if
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unresolved. Truecolor uses =38;2;R;G;B=, named colors use =3n=.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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(defun sgr-fg (color)
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@@ -232,6 +363,11 @@ resolution chain is: hex → named color → theme semantic role → empty.
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(t ""))))
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#+END_SRC
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*** sgr-bg
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~sgr-bg~ produces the SGR background escape. Same resolution chain as
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=sgr-fg= but uses =48;2;R;G;B= for truecolor and =4n= for named colors.
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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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@@ -251,13 +387,23 @@ resolution chain is: hex → named color → theme semantic role → empty.
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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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*** *sgr-attr-codes*
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Maps attribute keywords to SGR parameter numbers. Covers bold, dim,
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italic, underline, blink, reverse video, and reset.
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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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#+END_SRC
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*** sgr-attr
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~sgr-attr~ looks up the keyword in =*sgr-attr-codes*= and produces the
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matching SGR escape.
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#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
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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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@@ -268,11 +414,24 @@ Attribute codes map keywords to SGR numbers:
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|
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** Cursor escapes
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|
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*** cursor-move-escape
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|
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Produces a CSI =H= (CUP) sequence to position the cursor. Coordinates
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||||
are 1-indexed: =cursor-move-escape 0 0= moves to row 1, column 1.
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|
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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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#+END_SRC
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*** cursor-style-escape
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||||
|
||||
Produces a DECSTR sequence (=CSI Ps q=) to set the cursor shape.
|
||||
Base codes: block=2, underline=4, bar=6. When =blink= is true the code
|
||||
is incremented by 1 (e.g. blinking block = code 3).
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun cursor-style-escape (shape blink)
|
||||
"Return DECSTR escape for cursor shape."
|
||||
(let* ((base (case shape
|
||||
@@ -284,23 +443,50 @@ Attribute codes map keywords to SGR numbers:
|
||||
|
||||
** Sync and link escapes
|
||||
|
||||
*** decicm-begin
|
||||
|
||||
Enables DEC private mode 2026 (synchronized updates). All output
|
||||
between =begin= and =end= is buffered by the terminal and rendered
|
||||
atomically.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun decicm-begin ()
|
||||
"Return escape to enable synchronized updates."
|
||||
(format nil "~C[?2026h" #\Esc))
|
||||
#+END_SRC
|
||||
|
||||
*** decicm-end
|
||||
|
||||
Disables DEC private mode 2026, flushing the buffered frame to the
|
||||
display.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun decicm-end ()
|
||||
"Return escape to disable synchronized updates."
|
||||
(format nil "~C[?2026l" #\Esc))
|
||||
#+END_SRC
|
||||
|
||||
*** osc8-link
|
||||
|
||||
Wraps text in an OSC 8 hyperlink. The opening sequence carries the URL,
|
||||
the closing sequence (=ESC]8;;ESC\)=) terminates the link. This
|
||||
allows clickable text in terminals that support the protocol.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun osc8-link (url text)
|
||||
"Wrap TEXT in an OSC 8 hyperlink to URL."
|
||||
(format nil "~C]8;;~A~C\\\\~A~C]8;;~C\\\\"
|
||||
(format nil "~C]8;;~A~C\\~A~C]8;;~C\\"
|
||||
#\Esc url #\Esc text #\Esc #\Esc))
|
||||
#+END_SRC
|
||||
|
||||
** Border characters
|
||||
|
||||
*** *border-chars*
|
||||
|
||||
Lookup alist mapping =(style position)= pairs to Unicode box-drawing
|
||||
characters. Covers single, double, and rounded styles with all four
|
||||
corners plus horizontal and vertical connectors.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defparameter *border-chars*
|
||||
'(((:single :top-left) . "┌") ((:single :top-right) . "┐")
|
||||
@@ -312,7 +498,16 @@ Attribute codes map keywords to SGR numbers:
|
||||
((:rounded :top-left) . "╭") ((:rounded :top-right) . "╮")
|
||||
((:rounded :bottom-left) . "╰") ((:rounded :bottom-right) . "╯")
|
||||
((:rounded :horizontal) . "─") ((:rounded :vertical) . "│")))
|
||||
#+END_SRC
|
||||
|
||||
*** border-char
|
||||
|
||||
Looks up a border character by style and position. Falls back to
|
||||
horizontal/vertical lines (=U+2500=, =U+2502=) if the style is unknown
|
||||
for edge positions, or =+= for corners --- ensuring the UI never shows
|
||||
a blank gap.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun border-char (style pos)
|
||||
"Return the Unicode box-drawing character for STYLE at POS."
|
||||
(let ((char (cdr (assoc (list style pos) *border-chars* :test #'equal))))
|
||||
@@ -323,13 +518,28 @@ Attribute codes map keywords to SGR numbers:
|
||||
|
||||
** Modern backend class
|
||||
|
||||
*** modern-backend (class)
|
||||
|
||||
Subclasses the abstract =backend= class. =output-stream= is where escape
|
||||
sequences are written; =in-sync-p= tracks whether we are inside a
|
||||
DECICM synchronized update block.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defclass modern-backend (backend)
|
||||
((output-stream :initform *standard-output*
|
||||
:initarg :output-stream
|
||||
:accessor backend-output-stream)
|
||||
(in-sync-p :initform nil :accessor in-sync-p)))
|
||||
#+END_SRC
|
||||
|
||||
*** make-modern-backend
|
||||
|
||||
Factory function that creates a =modern-backend= instance. Accepts an
|
||||
optional =output-stream=; defaults to =*standard-output*=. The
|
||||
=color-palette= argument is ignored in favor of the dynamic
|
||||
=*theme-colors*= hash table.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defun make-modern-backend (&key color-palette output-stream)
|
||||
(declare (ignore color-palette))
|
||||
(make-instance 'modern-backend :output-stream (or output-stream *standard-output*)))
|
||||
@@ -337,9 +547,12 @@ Attribute codes map keywords to SGR numbers:
|
||||
|
||||
** Lifecycle
|
||||
|
||||
~initialize-backend~ enters the alt screen, enables mouse tracking,
|
||||
bracketed paste, and kitty keyboard protocol. ~shutdown-backend~
|
||||
restores everything.
|
||||
*** initialize-backend
|
||||
|
||||
Enters the alternate screen buffer, enables mouse tracking (basic +
|
||||
drag + SGR), bracketed paste mode, and the Kitty keyboard protocol.
|
||||
Hides the cursor and flushes the stream. Returns the backend instance
|
||||
for chaining.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod initialize-backend ((b modern-backend))
|
||||
@@ -352,7 +565,15 @@ restores everything.
|
||||
(cursor-hide b)
|
||||
(finish-output (backend-output-stream b))
|
||||
b)
|
||||
#+END_SRC
|
||||
|
||||
*** shutdown-backend
|
||||
|
||||
Restores the terminal: shows the cursor, disables the Kitty keyboard
|
||||
protocol, bracketed paste, SGR mouse, drag, basic mouse, and finally
|
||||
leaves the alternate screen. Returns =nil= (via =(values)=).
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod shutdown-backend ((b modern-backend))
|
||||
(cursor-show b)
|
||||
(backend-write b (format nil "~C[?u" #\Esc))
|
||||
@@ -367,8 +588,11 @@ restores everything.
|
||||
|
||||
** Backend-size via ioctl
|
||||
|
||||
Uses TIOCGWINSZ to query actual terminal dimensions. The alien-sap
|
||||
wrapper ensures compatibility across SBCL versions.
|
||||
*** backend-size
|
||||
|
||||
Uses TIOCGWINSZ (=0x5413= = 21523) to query actual terminal dimensions
|
||||
from the kernel via =ioctl=. The =alien-sap= wrapper ensures
|
||||
compatibility across SBCL versions. Returns (values cols rows).
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod backend-size ((b modern-backend))
|
||||
@@ -386,13 +610,27 @@ wrapper ensures compatibility across SBCL versions.
|
||||
|
||||
** Capability query and write
|
||||
|
||||
*** backend-write
|
||||
|
||||
Writes a string to the backend's output stream, flushing after each
|
||||
write to ensure the terminal receives the escape sequence immediately.
|
||||
Returns the string length for protocol compatibility.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod backend-write ((b modern-backend) string)
|
||||
(let ((stream (backend-output-stream b)))
|
||||
(write-string string stream)
|
||||
(finish-output stream)
|
||||
(length string)))
|
||||
#+END_SRC
|
||||
|
||||
*** capable-p
|
||||
|
||||
Advertises which features this backend supports. =modern-backend=
|
||||
supports truecolor, OSC 8 hyperlinks, DECICM sync, SGR mouse,
|
||||
bracketed paste, cursor style control, and the Kitty keyboard protocol.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod capable-p ((b modern-backend) feature)
|
||||
(member feature '(:truecolor :osc8 :sync :mouse
|
||||
:bracketed-paste :cursor-style
|
||||
@@ -401,9 +639,12 @@ wrapper ensures compatibility across SBCL versions.
|
||||
|
||||
** Drawing
|
||||
|
||||
~draw-text~ combines cursor positioning, SGR colors, attributes, the
|
||||
text itself, and a reset into a single string. This minimizes ioctl
|
||||
calls — one write per draw operation.
|
||||
*** draw-text
|
||||
|
||||
Combines cursor positioning, SGR colors, optional attributes, the text
|
||||
itself, and a reset into a single concatenated string. Minimizes output
|
||||
calls --- one =backend-write= per draw operation --- by packing everything
|
||||
into one buffer.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod draw-text ((b modern-backend) x y string fg bg
|
||||
@@ -421,9 +662,12 @@ calls — one write per draw operation.
|
||||
(backend-write b (apply #'concatenate 'string parts))))
|
||||
#+END_SRC
|
||||
|
||||
~draw-border~ builds the full border as three string parts (top with
|
||||
optional title, mid with sides, bottom) and writes them with minimal
|
||||
output calls.
|
||||
*** draw-border
|
||||
|
||||
Builds the full border as three distinct string parts (top with optional
|
||||
title, repeated mid sections, bottom) and writes them with minimal
|
||||
output calls. The title can be left-aligned or centered within the top
|
||||
border line. Uses the border character lookup for the chosen style.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod draw-border ((b modern-backend) x y width height
|
||||
@@ -480,6 +724,13 @@ output calls.
|
||||
(backend-write b bot)))
|
||||
#+END_SRC
|
||||
|
||||
*** draw-rect
|
||||
|
||||
Fills a rectangular area with a background color. For each row, moves
|
||||
the cursor and writes a filled line. This is simpler than =draw-border=
|
||||
because it has no border characters --- just spaces with a background
|
||||
color.
|
||||
|
||||
#+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))
|
||||
@@ -491,7 +742,16 @@ output calls.
|
||||
(loop :for row :from 0 :below height :do
|
||||
(backend-write b (cursor-move-escape x (+ y row)))
|
||||
(backend-write b line))))
|
||||
#+END_SRC
|
||||
|
||||
*** draw-link
|
||||
|
||||
Draws a hyperlinked text at position (x, y). Combines cursor
|
||||
positioning, optional fg/bg colors, the OSC 8 link wrapper around the
|
||||
text, and a reset. This lets the user click the text to open the URL
|
||||
in terminals that support OSC 8.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod draw-link ((b modern-backend) x y string url
|
||||
&key fg bg)
|
||||
(let ((parts (list (cursor-move-escape x y)
|
||||
@@ -499,7 +759,15 @@ output calls.
|
||||
(osc8-link url string)
|
||||
(sgr-attr :reset))))
|
||||
(backend-write b (apply #'concatenate 'string parts))))
|
||||
#+END_SRC
|
||||
|
||||
*** draw-ellipsis
|
||||
|
||||
Draws a three-dot ellipsis at the given position. The =width= parameter
|
||||
is ignored since dots have a fixed visual length; delegates to
|
||||
=draw-text= for uniform rendering.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod draw-ellipsis ((b modern-backend) x y width
|
||||
&key fg bg)
|
||||
(declare (ignore width))
|
||||
@@ -509,33 +777,87 @@ output calls.
|
||||
|
||||
** Cursor and input methods
|
||||
|
||||
*** cursor-move
|
||||
|
||||
Delegates to =cursor-move-escape= and writes the resulting CSI sequence
|
||||
to the output stream.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod cursor-move ((b modern-backend) x y)
|
||||
(backend-write b (cursor-move-escape x y)))
|
||||
#+END_SRC
|
||||
|
||||
*** cursor-hide
|
||||
|
||||
Sends the DECTCEM private mode =?25l= to hide the cursor.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod cursor-hide ((b modern-backend))
|
||||
(backend-write b (format nil "~C[?25l" #\Esc)))
|
||||
#+END_SRC
|
||||
|
||||
*** cursor-show
|
||||
|
||||
Sends =?25h= to restore the cursor visibility.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod cursor-show ((b modern-backend))
|
||||
(backend-write b (format nil "~C[?25h" #\Esc)))
|
||||
#+END_SRC
|
||||
|
||||
*** cursor-style
|
||||
|
||||
Sets the cursor shape (block/underline/bar, optionally blinking) by
|
||||
delegating to =cursor-style-escape=.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod cursor-style ((b modern-backend) shape &key blink)
|
||||
(backend-write b (cursor-style-escape shape blink)))
|
||||
#+END_SRC
|
||||
|
||||
*** enable-mouse
|
||||
|
||||
Enables basic mouse tracking, button-event tracking (drag), and SGR
|
||||
extended mouse mode. These three modes together give full mouse
|
||||
support while staying compatible with modern terminal emulators.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(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)))
|
||||
#+END_SRC
|
||||
|
||||
*** enable-bracketed-paste
|
||||
|
||||
Enables bracketed paste mode, where the terminal wraps pasted text in
|
||||
=ESC[200~= and =ESC[201~= delimiters. This allows the application to
|
||||
distinguish user input from pasted content.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod enable-bracketed-paste ((b modern-backend))
|
||||
(backend-write b (format nil "~C[?2004h" #\Esc))
|
||||
(finish-output (backend-output-stream b)))
|
||||
#+END_SRC
|
||||
|
||||
*** begin-sync
|
||||
|
||||
Begins a synchronized update frame using DECICM. Sets the =in-sync-p=
|
||||
slot so other methods can check whether we are inside a sync block.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod begin-sync ((b modern-backend))
|
||||
(setf (in-sync-p b) t)
|
||||
(backend-write b (decicm-begin)))
|
||||
#+END_SRC
|
||||
|
||||
*** end-sync
|
||||
|
||||
Ends the synchronized update frame and flushes the output, causing the
|
||||
terminal to render the buffered changes atomically.
|
||||
|
||||
#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
|
||||
(defmethod end-sync ((b modern-backend))
|
||||
(setf (in-sync-p b) nil)
|
||||
(backend-write b (decicm-end))
|
||||
|
||||
Reference in New Issue
Block a user