datatrash/src/mime_relations.rs

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