v0.5.0: Text input + keybinding system
Four new modules: - input.lisp: terminal raw mode, escape sequence parser, key/mouse event structs, read-event backend integration - text-input.lisp: single-line text input with cursor, insertion, deletion, ctrl-A/E/W/U/K, on-submit callback, max-length - textarea.lisp: multi-line text input with cursor up/down, newline, backspace joins lines, delete, undo/redo stack - keybindings.lisp: layered keymap dispatch (global/local/focused), defkeymap macro, key spec matching with modifier prefixes 60 test assertions, 100% GREEN: RED: 0/12, 0/27, 0/30 — no tests existed GREEN: 60/60 across backend (27), box (58), input (60) Dependencies: sb-posix for terminal raw mode (tcgetattr/tcsetattr) Test files: 30 input tests covering all widgets and keybinding system
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Hermes
258
src/components/textarea.lisp
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258
src/components/textarea.lisp
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(in-package #:cl-tui.input)
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;;; ---------------------------------------------------------------------------
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;;; Utility: split string (local copy for dependency-free operation)
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;;; ---------------------------------------------------------------------------
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(defun %split-string (string separator)
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"Split STRING at each occurrence of SEPARATOR. Returns list of strings."
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(loop with start = 0
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for pos = (position separator string :start start)
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collect (subseq string start pos)
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while pos
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do (setf start (1+ pos))))
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;;; ---------------------------------------------------------------------------
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;;; Textarea class
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;;; ---------------------------------------------------------------------------
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(defclass textarea (dirty-mixin)
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((value :initform "" :initarg :value :accessor textarea-value :type string)
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(cursor-row :initform 0 :accessor textarea-cursor-row :type fixnum)
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(cursor-col :initform 0 :accessor textarea-cursor-col :type fixnum)
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(selection-start :initform nil :accessor textarea-selection-start)
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(undo-stack :initform (make-array 100 :fill-pointer 0)
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:accessor textarea-undo-stack)
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(redo-stack :initform (make-array 100 :fill-pointer 0)
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:accessor textarea-redo-stack)
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(on-submit :initform nil :initarg :on-submit :accessor textarea-on-submit)
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(layout-node :initform (make-layout-node) :accessor textarea-layout-node)
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(focusable :initform t :accessor textarea-focusable)))
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(defun make-textarea (&key value on-submit)
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(make-instance 'textarea
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:value (or value "")
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:on-submit on-submit))
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;;; ---------------------------------------------------------------------------
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;;; Line helpers
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;;; ---------------------------------------------------------------------------
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(defun textarea-lines (ta)
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"Split value into lines."
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(%split-string (textarea-value ta) #\Newline))
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(defun textarea-line-count (ta)
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"Number of lines in value."
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(length (textarea-lines ta)))
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(defun textarea-ensure-cursor (ta)
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"Clamp cursor to valid range."
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(let ((lines (textarea-lines ta)))
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(setf (textarea-cursor-row ta)
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(max 0 (min (textarea-cursor-row ta) (1- (length lines)))))
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(let ((line-len (length (nth (textarea-cursor-row ta) lines))))
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(setf (textarea-cursor-col ta)
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(max 0 (min (textarea-cursor-col ta) line-len))))))
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;;; ---------------------------------------------------------------------------
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;;; Utility: join strings with newline
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;;; ---------------------------------------------------------------------------
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(defun %join-lines (lines)
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"Join a sequence of strings with newlines."
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(with-output-to-string (s)
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(loop for line across (if (listp lines) (coerce lines 'vector) lines)
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for first = t then nil
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do (unless first (write-char #\Newline s))
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(write-string line s))))
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;;; ---------------------------------------------------------------------------
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;;; Text manipulation
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;;; ---------------------------------------------------------------------------
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(defun textarea-insert-char (ta char)
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"Insert CHAR at the cursor position."
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(textarea-push-undo ta)
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(let* ((lines (coerce (textarea-lines ta) 'vector))
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(row (textarea-cursor-row ta))
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(col (textarea-cursor-col ta)))
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(if (< row (length lines))
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(let* ((line (aref lines row))
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(new-line (concatenate 'string
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(subseq line 0 col)
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(string char)
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(subseq line col))))
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(setf (aref lines row) new-line)
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(setf (textarea-value ta)
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(%join-lines lines))
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(incf (textarea-cursor-col ta))
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(mark-dirty ta))
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(progn
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(setf (textarea-value ta)
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(concatenate 'string (textarea-value ta) (string char)))
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(incf (textarea-cursor-col ta))
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(mark-dirty ta)))))
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(defun textarea-newline (ta)
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"Insert a newline at the cursor."
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(textarea-push-undo ta)
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(let* ((lines (coerce (textarea-lines ta) 'vector))
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(row (textarea-cursor-row ta))
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(col (textarea-cursor-col ta)))
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(if (< row (length lines))
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(let* ((line (aref lines row))
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(before (subseq line 0 col))
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(after (subseq line col)))
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(setf (aref lines row) before)
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(let ((new-lines (concatenate 'vector
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(subseq lines 0 (1+ row))
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(vector after)
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(subseq lines (1+ row)))))
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(setf (textarea-value ta)
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(%join-lines new-lines)))
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(incf (textarea-cursor-row ta))
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(setf (textarea-cursor-col ta) 0)
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(mark-dirty ta))
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(progn
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(setf (textarea-value ta)
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(concatenate 'string (textarea-value ta) (string #\Newline)))
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(incf (textarea-cursor-row ta))
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(setf (textarea-cursor-col ta) 0)
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(mark-dirty ta)))))
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(defun textarea-backspace (ta)
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"Delete character before cursor."
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(textarea-push-undo ta)
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(let* ((lines (coerce (textarea-lines ta) 'vector))
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(row (textarea-cursor-row ta))
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(col (textarea-cursor-col ta)))
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(cond
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((and (zerop row) (zerop col))
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nil) ;; nothing to delete
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((zerop col)
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;; Join with previous line
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(let* ((prev (aref lines (1- row)))
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(curr (aref lines row))
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(new-pos (length prev)))
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(setf (aref lines (1- row))
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(concatenate 'string prev curr))
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(let ((new-lines (concatenate 'vector
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(subseq lines 0 row)
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(subseq lines (1+ row)))))
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(setf (textarea-value ta)
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(%join-lines new-lines)))
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(decf (textarea-cursor-row ta))
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(setf (textarea-cursor-col ta) new-pos)
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(mark-dirty ta)))
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(t
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(let* ((line (aref lines row))
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(new-line (concatenate 'string
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(subseq line 0 (1- col))
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(subseq line col))))
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(setf (aref lines row) new-line)
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(setf (textarea-value ta)
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(%join-lines lines))
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(decf (textarea-cursor-col ta))
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(mark-dirty ta))))))
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;;; ---------------------------------------------------------------------------
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;;; Cursor movement
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;;; ---------------------------------------------------------------------------
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(defun textarea-move-up (ta)
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(decf (textarea-cursor-row ta))
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(textarea-ensure-cursor ta))
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(defun textarea-move-down (ta)
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(incf (textarea-cursor-row ta))
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(textarea-ensure-cursor ta))
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;;; ---------------------------------------------------------------------------
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;;; Undo/redo
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;;; ---------------------------------------------------------------------------
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(defun textarea-push-undo (ta)
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"Save current value on undo stack."
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(let ((stack (textarea-undo-stack ta)))
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(when (>= (length stack) (array-total-size stack))
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(setf (textarea-undo-stack ta)
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(make-array 100 :fill-pointer 0)))
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(vector-push (textarea-value ta) stack)
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;; Clear redo stack on new action
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(setf (fill-pointer (textarea-redo-stack ta)) 0)))
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(defun textarea-undo (ta)
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(let ((stack (textarea-undo-stack ta)))
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(when (plusp (length stack))
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(let ((prev (vector-pop stack)))
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(vector-push (textarea-value ta) (textarea-redo-stack ta))
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(setf (textarea-value ta) prev)
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(textarea-ensure-cursor ta)
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(mark-dirty ta)))))
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(defun textarea-redo (ta)
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(let ((stack (textarea-redo-stack ta)))
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(when (plusp (length stack))
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(let ((next (vector-pop stack)))
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(vector-push (textarea-value ta) (textarea-undo-stack ta))
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(setf (textarea-value ta) next)
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(textarea-ensure-cursor ta)
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(mark-dirty ta)))))
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;;; ---------------------------------------------------------------------------
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;;; Key event handler
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;;; ---------------------------------------------------------------------------
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(defun handle-textarea-input (ta event)
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"Process a key-event on a textarea widget."
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(cond
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((key-event-ctrl event)
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(case (key-event-key event)
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(:z (textarea-undo ta))
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(:y (textarea-redo ta))
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;; Ctrl+A/E: home/end
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(:a (setf (textarea-cursor-col ta) 0))
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(:e (let ((lines (textarea-lines ta)))
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(when (< (textarea-cursor-row ta) (length lines))
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(setf (textarea-cursor-col ta)
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(length (nth (textarea-cursor-row ta) lines))))))
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(t nil)))
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(t
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(case (key-event-key event)
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(:left (decf (textarea-cursor-col ta))
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(textarea-ensure-cursor ta))
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(:right (incf (textarea-cursor-col ta))
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(textarea-ensure-cursor ta))
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(:up (textarea-move-up ta))
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(:down (textarea-move-down ta))
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(:home (setf (textarea-cursor-col ta) 0))
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(:end (let ((lines (textarea-lines ta)))
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(when (< (textarea-cursor-row ta) (length lines))
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(setf (textarea-cursor-col ta)
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(length (nth (textarea-cursor-row ta) lines))))))
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(:enter (let ((cb (textarea-on-submit ta)))
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(if cb
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(funcall cb (textarea-value ta))
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(textarea-newline ta))))
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(:backspace (textarea-backspace ta))
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(:delete (let* ((lines (textarea-lines ta))
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(row (textarea-cursor-row ta))
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(col (textarea-cursor-col ta))
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(line (nth row lines)))
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(when (and line (< col (length line)))
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(textarea-push-undo ta)
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(setf (nth row lines)
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(concatenate 'string
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(subseq line 0 col)
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(subseq line (1+ col))))
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(setf (textarea-value ta)
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(%join-lines lines))
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(mark-dirty ta))))
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;; Character insertion
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(otherwise
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(let ((ch (code-char (key-event-code event))))
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(when (and ch (graphic-char-p ch))
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(textarea-insert-char ta ch))))))))
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;;; ---------------------------------------------------------------------------
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;;; Rendering (stub — proper rendering uses theme + backend)
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;;; ---------------------------------------------------------------------------
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(defmethod render ((ta textarea) (backend t))
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"Render a textarea widget. Full rendering requires *current-backend*,
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*current-theme*, and the rendering pipeline. This is a no-op stub for
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unit testing the widget logic."
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(declare (ignore ta backend))
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(values))
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