Add Emacs-style send-to-REPL commands with keybindings

[d-torrance]

Adds six commands mirroring the Macaulay2 Emacs major mode, each sending a different slice of the editor to the M2 REPL:

• Send Line to M2 REPL — sends the current line and advances the cursor down
• Send Region to M2 REPL — sends the active selection
• Send Buffer to M2 REPL — sends the entire document
• Send Everything Above Point to M2 REPL — sends from the start of the buffer to the cursor
• Send Everything Below Point to M2 REPL — sends from the cursor to the end of the buffer
• Send Paragraph to M2 REPL — sends the current paragraph and advances the cursor past it

Paragraph detection follows Emacs forward-paragraph/backward-paragraph semantics: paragraphs are delimited by blank lines. When the cursor is on a blank line, the next paragraph below is targeted; if only whitespace remains below, the previous paragraph above is used instead.

All send commands (including the existing Shift+Enter / Ctrl+Enter bindings) briefly highlight the range being sent for 300 ms using the editor.selectionHighlightBackground theme color. The flash is suppressed when editor.renderLineHighlight is "none" or "gutter", respecting the user's existing editor highlight preferences.

The paragraph boundary logic is extracted into a pure exported function getParagraphLineRange, covered by 11 unit tests.

Edit: An earlier iteration of this PR added Emacs-like keybindings for each of these functions, but they were later removed.

AI Disclosure

This was all Claude

[Copilot]

Pull request overview

Adds six Emacs-style send-to-REPL commands (line, region, buffer, above, below, paragraph) with Ctrl+C-prefixed chord keybindings, and introduces a 300 ms range flash highlight to all send operations. A pure getParagraphLineRange helper implements Emacs-style paragraph boundary detection and is covered by 11 new unit tests.

Changes:

• New executeLine/Region/Buffer/Above/Below/ParagraphInWebview functions plus a shared flashRange helper in src/backend/repl.ts, with corresponding command registrations and decoration cleanup in deactivate.
• New command and chord keybinding contributions in package.json (six new commands, all bound under editorTextFocus && editorLangId == macaulay2).
• Exported getParagraphLineRange and a new "Send Paragraph to REPL" test suite covering 11 boundary cases.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/backend/repl.ts	Adds six new send commands, the flashRange decoration helper, the exported getParagraphLineRange helper, command registrations, and decoration disposal on deactivate. Refactors existing send-to-terminal/webview to use range-based highlighting.
package.json	Adds six new macaulay2.send*ToREPL command contributions and ctrl+c-prefixed chord keybindings scoped to Macaulay2 editors.
src/backend/test/extension.test.ts	Imports getParagraphLineRange and adds an 11-case suite covering paragraph boundary detection (mid-paragraph, blank lines, top/bottom of file, all-blank buffer, etc.).

Comments suppressed due to low confidence (1)

src/backend/repl.ts:868

• executeSelectionInTerminal and executeSelectionInWebview now always execute cursorMove "down" after sending, including when a multi-line selection is active. Previously (via the removed getSelectedM2Code path), Shift+Enter / Ctrl+Enter with a selection did not move the cursor. Moving the cursor down by one line after the user has selected a region is unexpected and changes the long-standing behavior of these existing keybindings. Consider only advancing the cursor when the selection is empty (i.e., the "send current line" path), matching Emacs forward-line semantics, e.g. wrap the cursorMove call in if (selection.isEmpty) { ... }.

  executeCodeInTerminal(editor.document.getText(range));
  vscode.commands.executeCommand("cursorMove", {
    to: "down",
    by: "line",
    value: 1,
  });

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