Built-in extension bringing Notepad++-style power editing to LevelCode.

M1 feature 1 — Macros (this version):

While recording, typed text plus cursor moves (arrows, home/end, word-left/right), deletions (backspace/delete/word-delete), Enter and Tab are captured. Replay runs the steps at the current cursor; a motions-and-inserts macro replays as a single undo.

Recording only overrides the editor's type command for the duration of a recording session, so normal typing is never affected when you're not recording.

File operations:

• Duplicate — right-click a file or folder in the Explorer → Duplicate (or press Cmd+D in the file tree). Creates name copy.ext (then name copy 2.ext, …) next to the original. Works on folders (recursive) and multi-selection, and selects the new item so you can rename it immediately.

Sublime-style persistence: LevelCode ships with the strongest "hot exit" mode (files.hotExit = onExitAndWindowClose) as the built-in default, so unsaved edits and untitled tabs survive quitting the app and even an OS restart/shutdown — your work is continuously backed up to disk as you type. (window.restoreWindows is already all upstream.)

Because files.hotExit is an application-scoped setting, extensions are not permitted to change its default — so this is set as a one-line core default override (see docs/CORE-PATCHES.md). You can still pick any other mode in Settings → "Hot Exit".

Line operations: right-click in the editor → Line Operations, or run any from the Command Palette (LevelCode: Lines: … / LevelCode: Convert to …). They act on the selected lines, or the whole file if nothing is selected.

• Sort: ascending, descending, case-insensitive, numeric
• Remove: duplicate lines, consecutive duplicates, empty lines, trailing whitespace
• Reorder: reverse lines, join lines
• Case: UPPERCASE, lowercase, Title Case, tOGGLE cASE (per selection / multi-cursor; word or line under the cursor when nothing is selected)

Column editor: make a box selection (Shift+Alt+drag) or drop multiple cursors, then right-click → Column Editor, or run LevelCode: Column: … from the palette.

• Insert Incrementing Numbers — fills each cursor top→bottom. The start value is also the format: 1 → 1,2,3; 001 → 001,002,003 (leading zeros set padding); 0x0a → hex; add a second token for the step, e.g. 10 -2 → 10,8,6.
• Fill With Text — inserts the same text at every cursor/selection.

Encoding / line endings: a one-click toggle sits in the status bar (right side), labelled by platform — ⇄ LF · macOS/Unix or ⇄ CRLF · Windows — click it to convert the whole file's line endings instantly. Also from the editor right-click → Encoding / Line Endings, or the palette:

• Convert Line Endings to macOS/Unix (LF) / Windows (CRLF) / Toggle
• Change File Encoding… (reopen or save with a different encoding)

Big-file mode: large files open smoothly — the editor streams them into a memory-efficient buffer and reduces heavy features (syntax highlighting, etc.) automatically. LevelCode raises the open-without-confirmation limit (workbench.editorLargeFileConfirmation = 2048 MB) and shows a ⚡ Big-file mode badge in the status bar with a one-time notice when a file is at least levelcode.bigFile.thresholdMB (default 256). Editing, scrolling, and find still work; turn the notice off with levelcode.bigFile.notify.

AI features (temporarily off): the upstream GitHub Copilot chat/agent UI is hidden by default (chat.disableAIFeatures = true) and the proprietary Copilot extension is not bundled. LevelCode's own AI layer (M2) will replace it; this default flips back on once our provider is wired in.

Coming next in M1: line operations, column-mode extras, encoding/EOL controls, big-file mode, and the Notepad++ keymap.