Add Neovim floating chat input (:Augment chat-input)

[mgmonteleone]

Closes #61.

What

Adds a new range-aware :Augment chat-input subcommand that opens a centered floating window with a markdown scratch buffer for composing a chat message before sending it. This upstreams a dependency-free, Neovim-gated version of the floating input the issue author shared (their LazyVim gist), reusing the existing chat plumbing.

Behavior

• Floating window (Neovim only): nvim_open_win with a scratch buffer (buftype=nofile, bufhidden=wipe), markdown filetype, opened in insert mode.
• Submit: <C-s> (insert/normal) or <CR> (normal) joins the buffer lines, closes the float, and dispatches to the existing chat flow.
• Cancel: <Esc> (normal) or <C-c> (insert/normal) closes the float without sending.
• Range-aware: like :Augment chat, invoking from visual mode (or with a range) includes the selected text. On submit the prior visual selection is restored via gv so it is passed through to the chat request.
• Vim fallback: the floating window requires Neovim; in Vim (or when a message is supplied directly on the command line) it falls back to the standard input() prompt used by :Augment chat, with no change to existing behavior.
• No third-party dependencies and no default mappings are added.

Changes

• autoload/augment.vim — s:CommandChatInput handler + s:ChatInputSubmit callback; wired into command dispatch and completion.
• autoload/augment/chat.vim — augment#chat#OpenInputWindow plus submit/cancel helpers and buffer-local mappings.
• README.md, doc/augment.txt, CHANGELOG.md — document the new command.

Validation

• Headless Neovim smoke test (nvim --headless): verifies the function and completion entry exist, the float opens with a markdown buffer, a multi-line submit invokes the callback with the joined message and closes the window, and cancel closes the window without firing the callback. Result: SMOKE_OK.

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Pull Request opened by Augment Code | View session

[mgmonteleone]

^{PR Author Agent⚡}

👋 I've got this PR — here's what I'll handle for you:

• Review feedback — implement suggestions, answer questions, fix what comes up
• CI failures — I get pinged when checks fail and try to fix them
• Merge conflicts — bring the PR back up to date when it falls behind
• Merge gates — watch CI, reviews, and verification
• Ping you the moment it's ready to merge

Marking it ready and picking reviewers are your call — I'll leave both alone.

Drop a comment anytime!

_{Note: opened under @mgmonteleone's identity — the org bot lacks PR write access on this repo, so attribution may differ from other automated PRs.}

[mgmonteleone]

^{PR Author Agent⚡}

✅ Ready for review on 07df2f8:

• No CI checks are configured on this repo, so none will run.

Reviewer pick is your call — I won't request anyone myself. I'll respond to any review feedback as it comes in (no merge — that stays a human gate).

[johnny2211]

Minor UX thought: if the user switches out of the float (e.g. <C-w>w) it's orphaned with no clear way back. Worth having :Augment chat-input refocus an existing float instead of opening a new one? Avoids losing typed content on accidental focus loss. Not blocking.

[mgmonteleone]

^{PR Author Agent⚡}

Good call on the orphaned-float UX. Implemented in f35f72a: augment#chat#OpenInputWindow now checks for an existing valid input window first and, if found, refocuses it (nvim_set_current_win + startinsert) and returns early instead of opening a new float. The existing buffer and its submit callback are preserved, so typed content survives an accidental focus change (e.g. <C-w>w).

Updated the README and :help doc to note the refocus behavior, and extended the headless smoke test to cover it (re-invoking after moving focus away keeps the same window and its content). All checks pass (SMOKE_OK).

[johnny2211]

All good.