48 lines
1.3 KiB
Rust
48 lines
1.3 KiB
Rust
use std::{collections::HashMap, str::FromStr};
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use lazy_static::lazy_static;
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use mime::Mime;
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lazy_static! {
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static ref ALIASES: HashMap<Mime, Mime> = get_mime_aliases();
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static ref PARENTS: Vec<(Mime, Mime)> = get_mime_parent_relations();
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}
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fn get_mime_aliases() -> HashMap<Mime, Mime> {
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tree_magic_db::aliases()
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.lines()
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.flat_map(|line| line.split_once(' '))
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.flat_map(|(a, b)| Some((Mime::from_str(a).ok()?, Mime::from_str(b).ok()?)))
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.collect()
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}
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pub(crate) fn get_alias(mimetype: &Mime) -> &Mime {
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match ALIASES.get(mimetype) {
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Some(x) => x,
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None => mimetype,
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}
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}
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fn get_mime_parent_relations() -> Vec<(Mime, Mime)> {
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tree_magic_db::subclasses()
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.lines()
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.flat_map(|line| line.split_once(' '))
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.flat_map(|(child, parent)| {
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Some((Mime::from_str(child).ok()?, Mime::from_str(parent).ok()?))
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})
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.collect()
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}
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fn get_mime_parents(mimetype: &Mime) -> Vec<&Mime> {
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PARENTS
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.iter()
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.filter_map(|(child, parent)| (child == mimetype).then_some(parent))
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.collect()
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}
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pub(crate) fn has_text_parent(mime: &Mime) -> bool {
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get_mime_parents(mime)
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.iter()
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.any(|parent| parent.type_() == mime::TEXT || has_text_parent(parent))
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}
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