Test

[sidneyswift]

Summary by CodeRabbit

Release Notes

New Features

• Added support for attaching text files (CSV and Markdown formats) to chat messages
• Text attachments now display as preview cards showing filename, line count, and file type badge
• Users can remove individual text attachments before sending messages
• Text attachment content is automatically included in the message context when sending
• Enhanced attachment layout to properly wrap multiple attachments

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Project	Deployment	Review	Updated (UTC)
recoup-chat	Building	Preview	Jan 29, 2026 7:14pm

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

This PR adds support for text file attachments (CSV and Markdown) within the VercelChat system. New hooks manage text attachment state, utility functions serialize and deserialize attachments, and UI components display them. The dedicated CSV hook is replaced with a generic text attachment system.

Changes

Cohort / File(s)	Summary
New Text Attachment Infrastructure hooks/useTextAttachments.ts, lib/chat/formatTextAttachments.ts, lib/chat/parseTextAttachments.ts	Introduces hooks and utilities for managing text file attachments in-memory, formatting them into message context, and parsing them from received messages.
File Handling & Utilities lib/files/isAllowedByExtension.ts, lib/chat/config.ts	Adds extension-based file validation for browsers with generic MIME types, and extends supported file types to include Markdown (.md, .markdown).
Provider & Context Updates providers/VercelChatProvider.tsx, hooks/useVercelChat.ts	Extends VercelChatProvider to manage text attachments and updates useVercelChat to prepend formatted text attachment content to messages.
File Processing hooks/usePureFileAttachments.ts, hooks/useAttachments.ts	Replaces CSV-specific attachment logic with generic text attachment handling; routes CSV and Markdown files to addTextAttachment; removes dependency on useAttachCsv.
UI Component Updates components/VercelChat/TextFileCard.tsx, components/VercelChat/AttachmentsPreview.tsx, components/VercelChat/ChatInput.tsx, components/VercelChat/ViewingMessage.tsx	Introduces TextFileCard component for rendering text attachments, and updates existing components to display and manage text attachments throughout the chat interface.
Removed Code hooks/useAttachCsv.ts	Removes deprecated CSV-specific attachment hook, replaced by generic text attachment system.

Sequence Diagram(s)

sequenceDiagram
    actor User
    participant ChatInput
    participant usePureFileAttachments as usePureFileAttachments<br/>(Hook)
    participant useTextAttachments as useTextAttachments<br/>(Hook)
    participant VercelChatProvider
    participant useVercelChat

    User->>ChatInput: Select CSV/Markdown file
    ChatInput->>usePureFileAttachments: handleFileInput(file)
    
    alt CSV or Markdown file
        usePureFileAttachments->>usePureFileAttachments: Detect file type
        usePureFileAttachments->>useTextAttachments: addTextAttachment(file, type)
        useTextAttachments->>useTextAttachments: Read file as text,<br/>compute lineCount
        useTextAttachments->>VercelChatProvider: Update textAttachments state
    else Other file type
        usePureFileAttachments->>VercelChatProvider: Create temp URL,<br/>upload to /api/upload
    end
    
    User->>ChatInput: Click send
    ChatInput->>useVercelChat: handleSendMessage()
    useVercelChat->>useVercelChat: formatTextAttachments()<br/>prepend to message
    useVercelChat->>VercelChatProvider: Send message with context

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sequenceDiagram
    actor User
    participant ViewingMessage as ViewingMessage<br/>(Component)
    participant parseTextAttachments as parseTextAttachments<br/>(Util)
    participant TextFileCard

    User->>ViewingMessage: Render message with text attachments
    ViewingMessage->>parseTextAttachments: Extract attachments from text
    parseTextAttachments->>parseTextAttachments: Regex parse formatted blocks,<br/>extract filename/type/lineCount
    parseTextAttachments->>ViewingMessage: Return attachments +<br/>remaining text
    
    alt Has text attachments
        ViewingMessage->>TextFileCard: Render for each attachment
        TextFileCard->>User: Display card with filename,<br/>line count, type badge
    else No text attachments
        ViewingMessage->>User: Display text content
    end

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• Sweetmantech/myc 3477 messages remove reload component and pull directly from #1377 — Modifies VercelChat component surface to rely more on useVercelChatContext, extending the context interface similar to this PR's textAttachments additions.
• Sid/recoup chat transcribe #1450 — Reworks message composition and attachment handling in useVercelChat, overlapping with this PR's changes to message content prepending logic.

Suggested reviewers

• sweetmantech

Poem

📎 Text files now dance with images bright,
CSV and Markdown in unified light,
No more special cases, just generic care—
From upload to message, attachments flow fair.
One hook to bind them, one format to share! ✨

✨ Finishing touches

• 📝 Generate docstrings

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