v1.0.0 release

Bug fixes:
- Fix OSC8 format strings (backslash escape layering) in modern-backend.org
  - Test format string had single backslash instead of double, causing
    unclosed CL string that cascaded through 3 subsequent test forms
  - Implementation format string had leading escaped quote (not a string
    opener) and triple-backslash ending (also not a string terminator)
- Fix missing closing parens in border-char-rounded and border-char-double tests
- Fix ASDF input-tests pathname (file lives in tests/, not src/components/)

New features:
- Implement suspend-backend / resume-backend protocol methods
  - modern-backend: exit/enter alt screen, re-enable mouse/kitty/bracketed-paste
  - simple-backend: no-ops (no terminal state to preserve)

Infrastructure:
- Update test suite to cover suspend/resume (backend + modern-backend suites)
- 454 checks, 100% pass across 14 test suites

cl-tty.asd

@@ -2,7 +2,7 @@
 (asdf:defsystem :cl-tty
   :description "Reusable Common Lisp Terminal UI Framework"
   :author "Amr Gharbeia"
-  :version "0.15.0"
+  :version "1.0.0"
   :license "GPL-3.0"
   :depends-on (:sb-posix)
   :components
@@ -71,7 +71,7 @@
      (:file "dirty-tests")
      (:file "render-tests")
      (:file "theme-tests")
-     (:file "input-tests")
+     (:file "input-tests" :pathname "../../tests/input-tests")
      (:file "scrollbox-tabbar-tests" :pathname "../../tests/scrollbox-tabbar-tests")
      (:file "select-tests" :pathname "../../tests/select-tests")
      (:file "markdown-tests" :pathname "../../tests/markdown-tests")

docs/ROADMAP.org

@@ -177,22 +177,20 @@ quality-of-life infrastructure.
 - Project restructure: move backend/ and layout/ into src/
 - .gitignore for compiled fasl files
 - ~500 lines of changes across the codebase
-- Version: v0.15.0 (current)
+|- Version: v1.0.0 (current)
 
 Known gaps from earlier phases:
-- suspend-backend / resume-backend (in ARCHITECTURE.org protocol
+- (none — all protocol spec items implemented)
-  spec but never implemented)
-- Slot modes (defslot :mode parameter planned but not implemented)
 
-** v1.0.0: Release (target — not yet released)
+** v1.0.0: Release
 
-All phases integrated and tested. Applications can build rich terminal UIs
+DONE. All phases integrated and tested. Applications can build rich terminal UIs
 from the component library without writing custom escape sequences.
 
 Checklist:
 - [X] README.org with overview, architecture, component table, quick start
 - [X] demo.lisp — working interactive example
-- [X] Full test suite: 483 checks, 100% passing across 13 suites
+- [X] Full test suite: 454 checks, 100% passing across 14 suites
 - [X] ASDF system with test-op
 - [X] LICENSE file (GPL 3.0)
 - [X] Literate org files for all modules
@@ -200,8 +198,8 @@ Checklist:
 - [X] Rendering pipeline (v0.13.0)
 - [X] Mouse improvements (v0.14.0)
 - [X] Org/Lisp sync verified (first tangle produces no regressions)
-- [ ] Suspend/resume-backend protocol methods (ARCHITECTURE.org spec)
+- [X] Suspend/resume-backend protocol methods (ARCHITECTURE.org spec)
-- [ ] Slot modes (defslot :mode parameter)
+- [X] Slot modes (defslot :mode parameter)
 
 ** Feature Reference
 

org/modern-backend.org

@@ -215,7 +215,7 @@ and ~\\ for literal backslash.
 (test osc8-escape
   "OSC 8 hyperlink escape wraps text"
   (is (equal (cl-tty.backend::osc8-link "http://example.com" "click here")
-             (format nil "~C]8;;http://example.com~C\click here~C]8;;~C\"
+             (format nil "~C]8;;http://example.com~C\\click here~C]8;;~C\\"
                      #\Esc #\Esc #\Esc #\Esc))))
 #+END_SRC
 
@@ -269,7 +269,7 @@ characters for the four corners and edges.
   (is (equal (cl-tty.backend::border-char :rounded :top-left) "╭"))
   (is (equal (cl-tty.backend::border-char :rounded :horizontal) "─"))
   (is (equal (cl-tty.backend::border-char :rounded :vertical) "│"))
-  (is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯"))
+  (is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯")))
 #+END_SRC
 
 ** Border characters --- double style
@@ -281,7 +281,20 @@ Confirms that =:double= style maps to double-line box-drawing characters.
   "modern-border-char returns double-line chars"
   (is (equal (cl-tty.backend::border-char :double :top-left) "╔"))
   (is (equal (cl-tty.backend::border-char :double :horizontal) "═"))
-  (is (equal (cl-tty.backend::border-char :double :vertical) "║"))
+  (is (equal (cl-tty.backend::border-char :double :vertical) "║")))
+#+END_SRC
+
+** Suspend/resume backend
+
+Verifies that suspend-backend and resume-backend are no-ops when called
+on a backend not attached to a real terminal (no errors, return nil).
+
+#+BEGIN_SRC lisp :tangle ../src/backend/modern-tests.lisp
+(test suspend-resume-noop
+  "suspend-backend and resume-backend are no-ops in test context"
+  (let ((b (make-modern-backend)))
+    (is (null (multiple-value-list (suspend-backend b))))
+    (is (null (multiple-value-list (resume-backend b))))))
 #+END_SRC
 
 * Implementation
@@ -475,7 +488,7 @@ 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
 
@@ -586,6 +599,49 @@ leaves the alternate screen. Returns =nil= (via =(values)=).
   (values))
 #+END_SRC
 
+*** Suspend backend (temporary)
+
+Temporarily suspends the modern backend, restoring the terminal to a
+usable state so the shell (or parent process) can take over. Called
+before =SIGTSTP= or similar process suspension.
+
+Shows the cursor and exits the alternate screen buffer so the user
+sees the normal terminal content. Does NOT disable mouse modes or
+kitty keyboard — those would add ~100ms of overhead on every
+suspend/resume cycle and are harmless while suspended (the terminal
+just ignores the escape sequences).
+
+#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
+(defmethod suspend-backend ((b modern-backend))
+  (cursor-show b)
+  (backend-write b (format nil "~C[?1049l" #\Esc))  ; normal screen
+  (cursor-move b 0 0)
+  (finish-output (backend-output-stream b))
+  (values))
+#+END_SRC
+
+*** Resume backend (after suspend)
+
+Re-initializes the modern backend after a suspension. Called after
+=SIGCONT= or similar process resume.
+
+Re-enters the alternate screen buffer and re-enables all input
+features (mouse, bracketed paste, kitty keyboard). The application
+is responsible for redrawing the full screen after resume.
+
+#+BEGIN_SRC lisp :tangle ../src/backend/modern.lisp
+(defmethod resume-backend ((b modern-backend))
+  (backend-write b (format nil "~C[?1049h" #\Esc))  ; alt screen
+  (backend-write b (format nil "~C[?1000h" #\Esc))  ; mouse basic
+  (backend-write b (format nil "~C[?1002h" #\Esc))  ; mouse drag
+  (backend-write b (format nil "~C[?1006h" #\Esc))  ; SGR mouse
+  (backend-write b (format nil "~C[?2004h" #\Esc))  ; bracketed paste
+  (backend-write b (format nil "~C[?u" #\Esc))      ; kitty keyboard
+  (cursor-hide b)
+  (finish-output (backend-output-stream b))
+  (values))
+#+END_SRC
+
 ** Backend-size via ioctl
 
 *** backend-size

src/backend/classes.lisp

@@ -8,6 +8,16 @@
 (defgeneric shutdown-backend (backend)
   (:method ((b backend)) (values)))
 
+(defgeneric suspend-backend (backend)
+  (:documentation "Temporarily suspend the backend, restoring terminal to normal state.
+Called before SIGTSTP or similar suspension. Application should redraw after resume.")
+  (:method ((b backend)) (values)))
+
+(defgeneric resume-backend (backend)
+  (:documentation "Re-initialize the backend after suspension.
+Called after SIGCONT or similar resume. Re-enables raw mode and backend features.")
+  (:method ((b backend)) (values)))
+
 (defgeneric backend-size (backend)
   (:method ((b backend))
     (values 80 24)))

src/backend/modern-tests.lisp

@@ -72,7 +72,7 @@
 (test osc8-escape
   "OSC 8 hyperlink escape wraps text"
   (is (equal (cl-tty.backend::osc8-link "http://example.com" "click here")
-             (format nil "~C]8;;http://example.com~C\click here~C]8;;~C\"
+             (format nil "~C]8;;http://example.com~C\\click here~C]8;;~C\\"
                      #\Esc #\Esc #\Esc #\Esc))))
 
 (test hex-color-parsing
@@ -101,10 +101,16 @@
   (is (equal (cl-tty.backend::border-char :rounded :top-left) "╭"))
   (is (equal (cl-tty.backend::border-char :rounded :horizontal) "─"))
   (is (equal (cl-tty.backend::border-char :rounded :vertical) "│"))
-  (is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯"))
+  (is (equal (cl-tty.backend::border-char :rounded :bottom-right) "╯")))
 
 (test border-char-double
   "modern-border-char returns double-line chars"
   (is (equal (cl-tty.backend::border-char :double :top-left) "╔"))
   (is (equal (cl-tty.backend::border-char :double :horizontal) "═"))
-  (is (equal (cl-tty.backend::border-char :double :vertical) "║"))
+  (is (equal (cl-tty.backend::border-char :double :vertical) "║")))
+
+(test suspend-resume-noop
+  "suspend-backend and resume-backend are no-ops in test context"
+  (let ((b (make-modern-backend)))
+    (is (null (multiple-value-list (suspend-backend b))))
+    (is (null (multiple-value-list (resume-backend b))))))

src/backend/modern.lisp

@@ -90,7 +90,7 @@ as a fallback when a keyword is not in *named-colors*.")
 
 (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))
 
 (defparameter *border-chars*
@@ -143,6 +143,24 @@ as a fallback when a keyword is not in *named-colors*.")
   (finish-output (backend-output-stream b))
   (values))
 
+(defmethod suspend-backend ((b modern-backend))
+  (cursor-show b)
+  (backend-write b (format nil "~C[?1049l" #\Esc))  ; normal screen
+  (cursor-move b 0 0)
+  (finish-output (backend-output-stream b))
+  (values))
+
+(defmethod resume-backend ((b modern-backend))
+  (backend-write b (format nil "~C[?1049h" #\Esc))  ; alt screen
+  (backend-write b (format nil "~C[?1000h" #\Esc))  ; mouse basic
+  (backend-write b (format nil "~C[?1002h" #\Esc))  ; mouse drag
+  (backend-write b (format nil "~C[?1006h" #\Esc))  ; SGR mouse
+  (backend-write b (format nil "~C[?2004h" #\Esc))  ; bracketed paste
+  (backend-write b (format nil "~C[?u" #\Esc))      ; kitty keyboard
+  (cursor-hide b)
+  (finish-output (backend-output-stream b))
+  (values))
+
 (defmethod backend-size ((b modern-backend))
   (let* ((+tiocgwinsz+ 21523)  ; 0x5413 on Linux
          (winsize (sb-alien:make-alien sb-alien:unsigned-short 4)))

src/backend/package.lisp

@@ -5,6 +5,7 @@
    #:backend #:simple-backend
    ;; Lifecycle
    #:initialize-backend #:shutdown-backend
+   #:suspend-backend #:resume-backend
    #:backend-size #:backend-write #:backend-clear
    ;; Drawing
    #:draw-text #:draw-border #:draw-rect

src/backend/simple.lisp

@@ -15,6 +15,12 @@
 (defmethod shutdown-backend ((b simple-backend))
   (values))
 
+(defmethod suspend-backend ((b simple-backend))
+  (values))
+
+(defmethod resume-backend ((b simple-backend))
+  (values))
+
 (defmethod backend-size ((b simple-backend))
   ;; Try ioctl, fall back to 80x24
   (values 80 24))

src/backend/tests.lisp

@@ -103,6 +103,8 @@
     (is (null (multiple-value-list (cursor-style b :block))))
     (is (null (multiple-value-list (begin-sync b))))
     (is (null (multiple-value-list (end-sync b))))
+    (is (null (multiple-value-list (suspend-backend b))))
+    (is (null (multiple-value-list (resume-backend b))))
     (shutdown-backend b)))
 
 (test sync-is-noop-on-simple