1use ignore::gitignore::Gitignore;
 2use std::{ffi::OsStr, path::Path, sync::Arc};
 3
 4pub enum IgnoreStack {
 5    None,
 6    Some {
 7        abs_base_path: Arc<Path>,
 8        ignore: Arc<Gitignore>,
 9        parent: Arc<IgnoreStack>,
10    },
11    All,
12}
13
14impl IgnoreStack {
15    pub fn none() -> Arc<Self> {
16        Arc::new(Self::None)
17    }
18
19    pub fn all() -> Arc<Self> {
20        Arc::new(Self::All)
21    }
22
23    pub fn append(self: Arc<Self>, abs_base_path: Arc<Path>, ignore: Arc<Gitignore>) -> Arc<Self> {
24        match self.as_ref() {
25            IgnoreStack::All => self,
26            _ => Arc::new(Self::Some {
27                abs_base_path,
28                ignore,
29                parent: self,
30            }),
31        }
32    }
33
34    pub fn is_abs_path_ignored(&self, abs_path: &Path, is_dir: bool) -> bool {
35        if is_dir && abs_path.file_name() == Some(OsStr::new(".git")) {
36            return true;
37        }
38        match self {
39            Self::None => false,
40            Self::All => true,
41            Self::Some {
42                abs_base_path,
43                ignore,
44                parent: prev,
45            } => match ignore.matched(abs_path.strip_prefix(abs_base_path).unwrap(), is_dir) {
46                ignore::Match::None => prev.is_abs_path_ignored(abs_path, is_dir),
47                ignore::Match::Ignore(_) => true,
48                ignore::Match::Whitelist(_) => false,
49            },
50        }
51    }
52}