backport extend

src/extend.rs

@@ -0,0 +1,54 @@
+use std::{
+    fs::File,
+    io::{self, Read},
+    path::{Path, PathBuf},
+};
+
+pub fn file_blake3(file: &Path) -> std::io::Result<String> {
+    let mut blake3 = blake3::Hasher::new();
+    let mut file = File::open(file)?;
+    let mut buffer = [0; 1024];
+    loop {
+        let n = file.read(&mut buffer)?;
+        if n == 0 {
+            break;
+        }
+        blake3.update(&buffer[..n]);
+    }
+    Ok(blake3.finalize().to_string())
+}
+
+pub trait Blake3Path {
+    fn get_blake3(&self) -> io::Result<String>;
+}
+impl Blake3Path for Path {
+    fn get_blake3(&self) -> io::Result<String> {
+        if self.is_dir() {
+            // The default Error (PermissionDenied) is not very helpful when troubleshooting
+            return Err(io::Error::new(
+                io::ErrorKind::InvalidInput,
+                format!("Path is a directory ({})", self.cute_path()),
+            ));
+        }
+        file_blake3(self)
+    }
+}
+impl Blake3Path for PathBuf {
+    fn get_blake3(&self) -> io::Result<String> {
+        self.as_path().get_blake3()
+    }
+}
+
+pub trait CutePath {
+    fn cute_path(&self) -> String;
+}
+impl CutePath for Path {
+    fn cute_path(&self) -> String {
+        self.to_str().unwrap().replace('\\', "/")
+    }
+}
+impl CutePath for PathBuf {
+    fn cute_path(&self) -> String {
+        self.as_path().cute_path()
+    }
+}