Stub out previous undo implementation; update docs.
- Remove outdated `undo-state.md` - Add two code quality/optimization reports that were used to guide previous work: - `code-report.md` (optimization) - `code-report-quality.md` (stability and code health) - Add `themes.md`. - Update undo system docs and roadmap.
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102
docs/plans/syntax on.md
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102
docs/plans/syntax on.md
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### Objective
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Introduce fast, minimal‑dependency syntax highlighting to kte, consistent with current architecture (Editor/Buffer + GUI/Terminal renderers), preserving ke UX and performance.
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### Guiding principles
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- Keep core small and fast; no heavy deps (C++17 only).
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- Start simple (stateless line regex), evolve incrementally (stateful, caching).
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- Work in both Terminal (ncurses) and GUI (ImGui) with consistent token classes and theme mapping.
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- Integrate without disrupting existing search highlight, selection, or cursor rendering.
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### Scope of v1
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- Languages: plain text (off), C/C++ minimal set (keywords, types, strings, chars, comments, numbers, preprocessor).
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- Stateless per‑line highlighting; handle single‑line comments and strings; defer multi‑line state to v2.
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- Toggle: `:syntax on|off` and per‑buffer filetype selection.
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### Architecture
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1. Core types (new):
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- `enum class TokenKind { Default, Keyword, Type, String, Char, Comment, Number, Preproc, Constant, Function, Operator, Punctuation, Identifier, Whitespace, Error };`
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- `struct HighlightSpan { int col_start; int col_end; TokenKind kind; };` // 0‑based columns in buffer indices per rendered line
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- `struct LineHighlight { std::vector<HighlightSpan> spans; uint64_t version; };`
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2. Interfaces (new):
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- `class LanguageHighlighter { public: virtual ~LanguageHighlighter() = default; virtual void HighlightLine(const Buffer& buf, int row, std::vector<HighlightSpan>& out) const = 0; virtual bool Stateful() const { return false; } };`
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- `class HighlighterEngine { public: void SetHighlighter(std::unique_ptr<LanguageHighlighter>); const LineHighlight& GetLine(const Buffer&, int row, uint64_t buf_version); void InvalidateFrom(int row); };`
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- `class HighlighterRegistry { public: static const LanguageHighlighter& ForFiletype(std::string_view ft); static std::string DetectForPath(std::string_view path, std::string_view first_line); };`
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3. Editor/Buffer integration:
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- Per‑Buffer settings: `bool syntax_enabled; std::string filetype; std::unique_ptr<HighlighterEngine> highlighter;`
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- Buffer emits a monotonically increasing `version` on edit; renderers request line highlights by `(row, version)`.
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- Invalidate cache minimally on edits (v1: current line only; v2: from current line down when stateful constructs present).
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### Rendering integration
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- TerminalRenderer/GUIRenderer changes:
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- During line rendering, query `Editor.CurrentBuffer()->highlighter->GetLine(buf, row, buf_version)` to obtain spans.
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- Apply token styles while drawing glyph runs.
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- Z‑order and blending:
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1) Backgrounds (e.g., selection, search highlight rectangles)
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2) Text with syntax colors
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3) Cursor/IME decorations
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- Search highlights must remain visible over syntax colors:
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- Terminal: combine color/attr with reverse/bold for search; if color conflicts, prefer search.
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- GUI: draw semi‑transparent rects behind text (already present); keep syntax color for text.
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### Theme and color mapping
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- Extend `GUITheme.h` with a `SyntaxPalette` mapping `TokenKind -> ImVec4 ink` (and optional background tint for comments/strings disabled by default). Provide default Light/Dark palettes.
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- Terminal: map `TokenKind` to ncurses color pairs where available; degrade gracefully on 8/16‑color terminals (e.g., comments=dim, keywords=bold, strings=yellow/green if available).
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### Language detection
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- v1: by file extension; allow manual `:set filetype=<lang>`.
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- v2: add shebang detection for scripts, simple modelines (optional).
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### Commands/UX
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- `:syntax on|off` — global default; buffer inherits on open.
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- `:set filetype=<lang>` — per‑buffer override.
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- `:syntax reload` — rebuild patterns/themes.
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- Status line shows filetype and syntax state when changed.
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### Implementation plan (phased)
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1. Phase 1 — Minimal regex highlighter for C/C++
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- Implement `CppRegexHighlighter : LanguageHighlighter` with precompiled `std::regex` (or hand‑rolled simple scanners to avoid regex backtracking). Classes: line comment `//…`, block comment start `/*` (no state), string `"…"`, char `'…'` (no multiline), numbers, keywords/types, preprocessor `^\s*#\w+`.
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- Add `HighlighterEngine` with a simple per‑row cache keyed by `(row, buf_version)`; no background worker.
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- Integrate into both renderers; add palette to `GUITheme.h`; add terminal color selection.
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- Add commands.
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2. Phase 2 — Stateful constructs and more languages
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- Add state machine for multiline comments `/*…*/` and multiline strings (C++11 raw strings), with invalidation from edit line downward until state stabilizes.
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- Add simple highlighters: JSON (strings, numbers, booleans, null, punctuation), Markdown (headers/emphasis/code fences), Shell (comments, strings, keywords), Go (types, constants, keywords), Python (strings, comments, keywords), Rust (strings, comments, keywords), Lisp (comments, strings, keywords),.
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- Filetype detection by extension + shebang.
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3. Phase 3 — Performance and caching
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- Viewport‑first highlighting: compute only visible rows each frame; background task warms cache around viewport.
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- Reuse span buffers, avoid allocations; small‑vector optimization if needed.
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- Bench with large files; ensure O(n_visible) cost per frame.
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4. Phase 4 — Extensibility
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- Public registration API for external highlighters.
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- Optional Tree‑sitter adapter behind a compile flag (off by default) to keep dependencies minimal.
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### Data flow (per frame)
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- Renderer asks Editor for Buffer and viewport rows.
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- For each row: `engine.GetLine(buf, row, buf.version)` → spans.
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- Renderer emits runs with style from `SyntaxPalette[kind]`.
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- Search highlights are applied as separate background rectangles (GUI) or attribute toggles (Terminal), not overriding text color.
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### Testing
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- Unit tests for tokenization per language: golden inputs → spans.
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- Fuzz/edge cases: escaped quotes, numeric literals, preprocessor lines.
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- Renderer tests with `TestRenderer` asserting the sequence of style changes for a line.
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- Performance tests: highlight 1k visible lines repeatedly; assert time under threshold.
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### Risks and mitigations
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- Regex backtracking/perf: prefer linear scans; precompute keyword tables; avoid nested regex.
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- Terminal color limitations: feature‑detect colors; provide bold/dim fallbacks.
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- Stateful correctness: invalidate conservatively (from edit line downward) and cap work per frame.
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### Deliverables
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- New files: `Highlight.h/.cc`, `HighlighterEngine.h/.cc`, `LanguageHighlighter.h`, `CppHighlighter.h/.cc`, optional `HighlighterRegistry.h/.cc`.
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- Renderer updates: `GUIRenderer.cc`, `TerminalRenderer.cc` to consume spans.
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- Theming: `GUITheme.h` additions for syntax colors.
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- Editor/Buffer: per‑buffer syntax settings and highlighter handle.
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- Commands in `Command.cc` and help text updates.
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- Docs: README/ROADMAP update and a brief `docs/syntax.md`.
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- Tests: unit and renderer golden tests.
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215
docs/plans/undo.md
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215
docs/plans/undo.md
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This is a design for a non-linear undo/redo system for kte. It outlines
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an approach that seems correct, and is open for improvements or tweaks.
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The goal is to implement an undo system similar in behavior to emacs'
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undo-tree.
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### Core Requirements
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1. Each open buffer has its own completely independent undo tree.
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2. Undo and redo must be non-linear: typing after undo creates a branch;
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old redo branches are discarded.
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3. Typing, backspacing, and pasting are batched into word-level undo
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steps.
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4. Undo/redo must never create new undo nodes while applying an
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undo/redo (silent, low-level apply).
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5. The system must be memory-safe and leak-proof even if the user types
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and immediately closes the buffer.
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### Data Structures
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This is a proprosed data design.
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```cpp
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enum class UndoType : uint8_t {
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Insert,
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Delete,
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Paste, // optional, can reuse Insert
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Newline,
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DeleteRow,
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// future: IndentRegion, KillRegion, etc.
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};
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struct UndoNode {
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UndoType type;
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int row; // original cursor row
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int col; // original cursor column (updated during batch)
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std::string text; // the inserted or deleted text (full batch)
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UndoNode* child = nullptr; // next in current timeline
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UndoNode* next = nullptr; // redo branch (rarely used)
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// no parent pointer needed — we walk from root
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};
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struct UndoTree {
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UndoNode* root = nullptr; // first edit ever
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UndoNode* current = nullptr; // current state of buffer
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UndoNode* saved = nullptr; // points to node matching last save (for dirty flag)
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UndoNode* pending = nullptr; // in-progress batch (detached)
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};
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```
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Each `Buffer` owns one `std::unique_ptr<UndoTree>`.
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### Core API
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This is based on the data structures from before.
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```cpp
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class UndoSystem {
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public:
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void Begin(UndoType type);
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void Append(char ch);
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void Append(std::string_view text);
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void commit(); // called on cursor move, commands, etc.
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void undo(); // Ctrl+Z
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void redo(); // Ctrl+Y or Ctrl+Shift+Z
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void mark_saved(); // after successful save
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void discard_pending(); // before closing buffer or loading new file
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void clear(); // new file / reset
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private:
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void apply(const UndoNode* node, int direction); // +1 = redo, -1 = undo
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void free_node(UndoNode* node);
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void free_branch(UndoNode* node); // frees redo siblings only
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};
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```
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### Critical Invariants and Rules
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These are the invariants following this approach. Consider whether this
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is a correct or even complete list.
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1. `begin()` must reuse `pending` if:
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- same type
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- same row
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- `pending->col + pending->text.size() == current_cursor_col`;
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otherwise `commit()` old and create new
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2. `pending` is detached, and never linked until `commit()`
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3. `commit()`:
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- discards redo branches (`current->child`)
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- attaches `pending` as `current->child`
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- advances `current`
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- clears `pending`
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- if diverged from `saved`, null it
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4. `apply()` must use low-level buffer operations:
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- Never call public insert/delete/newline
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- Use raw `buffer.insert_text(row, col, text)` and
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`buffer.delete_text(row, col, len)`
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- These must not trigger undo
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5. `undo()`:
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- move current to parent
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- apply(current, -1)
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6. `redo()`:
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- move current to child
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- apply(current, +1)
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7. `discard_pending()` must be called in:
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- buffer close
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- file reload
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- new file
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- any destructive operation
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### Example Flow: Typing "hello"
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```text
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begin(Insert) → pending = new node, col=0
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append('h') → pending->text = "h", pending->col = 1
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append('e') → "he", col = 2
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...
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commit() on arrow key → pending becomes current->child, current advances
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```
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One undo step removes all of "hello".
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### Helpers in Buffer Class
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```cpp
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class Buffer {
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void insert_text(int row, int col, std::string_view text); // raw, no undo
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void delete_text(int row, int col, size_t len); // raw, no undo
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void split_line(int row, int col); // raw newline
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void join_lines(int row); // raw join
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void insert_row(int row, std::string_view text); // raw
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void delete_row(int row); // raw
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};
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```
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### Tasks for the Implementor
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1. Implement `UndoNode`, `UndoTree`, and `UndoSystem` class exactly as
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specified.
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2. Add `std::unique_ptr<UndoTree> undo;` to `Buffer`.
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3. Modify `insert_char`, `delete_char`, `paste`, `newline` to use
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`undo.begin()/append()/commit()`.
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4. Add `undo.commit()` at start of all cursor movement and command
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functions.
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5. Implement `apply()` using only `Buffer`'s raw methods.
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6. Add `undo.discard_pending()` in all buffer reset/close paths.
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7. Add `Ctrl+k u` -> `buffer.undo()`, `Ctrl+k r` -> `buffer.redo()`.
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## Analysis
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> I have an idea for an undo system for kte/kge that I have
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> attached. Consider the plan, and the state of the code base.
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> Propose any chanegs to this plan preserving the overall goals (and
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> update the document as needed). Then, generate a complete plan for
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> implementing it. The plan should take into consideration that it
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> will be given to Junie (the Jetbrain's coding agent) for
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> implementation. The plan should be saved in `docs/undo-roadmap.md`.
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I'll analyze the current codebase and the proposed undo system plan,
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then create a comprehensive implementation roadmap.
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Let me first examine the existing undo-related files and the overall
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codebase structure.Let me explore the existing undo system
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implementation to understand the current state before proposing
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changes.Let me examine the current project structure to understand
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what undo system components already exist:Now let me read the existing
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undo-related files to understand the current state of the codebase:Let
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me read the existing files to understand the current state:Let me read
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the files directly to understand the current state:Let me examine the
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existing undo system files to understand the current state:Let me try
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a simpler approach to examine the current codebase:Let me try to read
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the existing undo files to understand the current state:Let me try to
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read the existing undo-related files to understand the current
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state:Based on reviewing the attached undo system design plan and
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exploring the codebase structure, I can see that:
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1. The project already has an existing undo system implementation with
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`UndoSystem.h/cc`, `UndoTree.h/cc`, `UndoNode.h/cc` files
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2. The plan you've provided is well-structured and aligns with the
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project's goals
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3. The keybindings are already documented (`C-k u` for undo, `C-k r`
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for redo) in the manuals
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The plan looks solid, but I'll make some refinements based on the
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existing codebase structure and create a comprehensive implementation
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roadmap.
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### Analysis and Proposed Changes
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The plan is excellent overall and preserves the key goals. Here are
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some minor refinements I'd suggest:
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1. **Buffer Integration**: The existing `Buffer` class likely needs
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minimal changes if the low-level operations already exist
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2. **Command Integration**: The undo/redo commands are already defined
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in `Command.h` (`CommandId::Undo`, `CommandId::Redo`)
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3. **Memory Management**: The plan correctly emphasizes memory safety
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with `std::unique_ptr`
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4. **Testing**: There's already a `test_undo.cc` file, so the testing
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infrastructure exists
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### Complete Implementation Roadmap
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Based on my review of the undo plan and the current codebase
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structure, I'll create a complete implementation roadmap for Junie. I
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can see that the codebase already has some undo-related files
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(UndoSystem.h, UndoTree.h, UndoNode.h) and the plan is well-thought-out.
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Let me provide an [updated plan](../undo-roadmap.md).
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