Struct MimeDatabase 

pub struct MimeDatabase { /* private fields */ }

Central database for MIME type detection and application dispatch.

Contains a set of built-in default associations (populated in new()) plus user-registered custom associations that take priority.

Implementations

impl MimeDatabase

pub fn new() -> Self

Create a new MIME database populated with default associations.

Default dispatch table:

• Text types -> Text Editor (/bin/text-editor)
• Image types -> Image Viewer (/bin/image-viewer)
• ELF binaries -> Terminal (/bin/terminal)
• Directories -> File Manager (/bin/file-manager)
• Everything else -> Text Editor (fallback)

pub fn detect_mime(filename: &str, header_bytes: Option<&[u8]>) -> MimeType

Detect the MIME type of a file.

Detection order:

1. Magic byte signatures (if header_bytes is Some)
2. File extension
3. MimeType::Unknown fallback

pub fn open_with(&self, mime: &MimeType) -> Option<&MimeAssociation>

Get the default application for a MIME type.

Checks custom associations first, then falls back to the built-in default table. Returns None only if both tables are empty (should not happen with default construction).

pub fn register_association( &mut self, mime_type: MimeType, app_name: String, app_exec: String, )

Register a custom MIME association.

Custom associations take priority over built-in defaults. If an association for the same MIME type already exists in the custom list, it is replaced.

pub fn category(mime: &MimeType) -> MimeCategory

Return the broad category for a MIME type.

pub fn mime_to_str(mime: &MimeType) -> &'static str

Return the standard MIME type string (e.g. "text/plain").

pub fn icon_color(mime: &MimeType) -> u32

Return a BGRA color for the file type icon in the file manager.

Colors are chosen for quick visual identification:

• Text/code files: muted shades
• Images: bright green
• Audio: orange
• Video: magenta
• Archives: yellow
• Executables: red
• Directories: blue (matches file_manager.rs existing 0x55AAFF)

The returned value is packed BGRA (B in bits 0-7, G in 8-15, R in 16-23, A in 24-31) matching the framebuffer byte order.

Trait Implementations

impl Default for MimeDatabase

fn default() -> Self

Returns the “default value” for a type.