1 files changed, 43 insertions, 0 deletions

diff --git a/crates/vfs-notify/src/include.rs b/crates/vfs-notify/src/include.rs
new file mode 100644
index 000000000..7378766f5
--- /dev/null
+++ b/crates/vfs-notify/src/include.rs
@@ -0,0 +1,43 @@
+//! See `Include`.
+
+use std::convert::TryFrom;
+
+use globset::{Glob, GlobSet, GlobSetBuilder};
+use paths::{RelPath, RelPathBuf};
+
+/// `Include` is the opposite of .gitignore.
+///
+/// It describes the set of files inside some directory.
+///
+/// The current implementation is very limited, it allows white-listing file
+/// globs and black-listing directories.
+#[derive(Debug, Clone)]
+pub(crate) struct Include {
+    include_files: GlobSet,
+    exclude_dirs: Vec<RelPathBuf>,
+}
+
+impl Include {
+    pub(crate) fn new(include: Vec<String>) -> Include {
+        let mut include_files = GlobSetBuilder::new();
+        let mut exclude_dirs = Vec::new();
+
+        for glob in include {
+            if glob.starts_with("!/") {
+                if let Ok(path) = RelPathBuf::try_from(&glob["!/".len()..]) {
+                    exclude_dirs.push(path)
+                }
+            } else {
+                include_files.add(Glob::new(&glob).unwrap());
+            }
+        }
+        let include_files = include_files.build().unwrap();
+        Include { include_files, exclude_dirs }
+    }
+    pub(crate) fn include_file(&self, path: &RelPath) -> bool {
+        self.include_files.is_match(path)
+    }
+    pub(crate) fn exclude_dir(&self, path: &RelPath) -> bool {
+        self.exclude_dirs.iter().any(|excluded| path.starts_with(excluded))
+    }
+}