Editing cells

Edit Python and Markdown in an embedded Neovim buffer.

Enter on source or Markdown, or b, opens an embedded, isolated Neovim buffer. Eligible literal mo.md(...) cells open as Markdown; dynamic or otherwise unsafe-to-decode Markdown opens as Python source. Neovim runs with a clean built-in runtime, without your personal init, plugins or autocommands. Its normal editing keys, including Escape, Enter, ?, #, q, !, \, H/L, motions, visual mode, registers, macros and Ex commands, belong to Neovim while editing.

editor key or command	action
F1	help
F2, :w	save only, without running
F3, :MarimoRun	save, then run the saved cell
F4, :MarimoClose	leave; dirty drafts require a decision
F5	switch dock/full screen
F6, :MarimoRevert	revert to the last saved base, with confirmation if dirty
F7	toggle line numbers
F8	read the full transient message, retaining the editor draft
:wq	save only and close
:q!	deliberately discard and close

A failed save keeps the draft. If the browser or agent changes the cell, saving detects the conflict rather than overwriting it: compare current source and draft, continue editing, copy the draft, or discard and reload. Unexpected Neovim exit retains the latest draft in memory for reopening, copying or discarding; it is not persistent recovery across Pi restarts. Dock transfers and chat focus preserve the editor. A save-and-run can save successfully but fail to run; the view reports that separately.