Attribute Macro in_component 

#[in_component]

Mark modules or files as belonging to a specific component.

This attribute enables:

• Discovery: Find all files in a component via grep or IDE search
• Navigation: IDE integration for “jump to component” features
• Documentation: Auto-group errors by component in generated docs
• Organization: Track scattered components across different folders

Syntax

#[in_component(ComponentName)]

Examples

Marking a folder (via mod.rs):

// src/auth/mod.rs
#[in_component(Auth)]

mod token;
mod session;

Marking scattered files:

// src/api/middleware.rs
#[in_component(Auth)]  // Auth logic here too!

use waddling_errors::diag;
// ... Auth-related errors ...

Finding all Auth components:

grep -r "#\[in_component(Auth)\]" src/

Metadata Generated

The macro creates a hidden module with:

• Component name constant
• Module path (for IDE integration)
• File path (for tooling)
• Marker trait (for discovery)