Batch rename: imfs -> vfs

src/vfs/fetcher.rs

@@ -0,0 +1,36 @@
+use std::{
+    io,
+    path::{Path, PathBuf},
+};
+
+use crossbeam_channel::Receiver;
+
+use super::event::VfsEvent;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum FileType {
+    File,
+    Directory,
+}
+
+/// The generic interface that `Vfs` uses to lazily read files from the disk.
+/// In tests, it's stubbed out to do different versions of absolutely nothing
+/// depending on the test.
+pub trait VfsFetcher {
+    fn file_type(&mut self, path: &Path) -> io::Result<FileType>;
+    fn read_children(&mut self, path: &Path) -> io::Result<Vec<PathBuf>>;
+    fn read_contents(&mut self, path: &Path) -> io::Result<Vec<u8>>;
+
+    fn create_directory(&mut self, path: &Path) -> io::Result<()>;
+    fn write_file(&mut self, path: &Path, contents: &[u8]) -> io::Result<()>;
+    fn remove(&mut self, path: &Path) -> io::Result<()>;
+
+    fn watch(&mut self, path: &Path);
+    fn unwatch(&mut self, path: &Path);
+    fn receiver(&self) -> Receiver<VfsEvent>;
+
+    /// A method intended for debugging what paths the fetcher is watching.
+    fn watched_paths(&self) -> Vec<&Path> {
+        Vec::new()
+    }
+}