Add new trait PathExt & impl for Path

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>

src/helpers.rs

@@ -24,6 +24,9 @@ pub use extracter::TarEntriesVisitor;
 
 mod readable_rx;
 
+mod path_ext;
+pub use path_ext::*;
+
 /// Load binstall metadata from the crate `Cargo.toml` at the provided path
 pub fn load_manifest_path<P: AsRef<Path>>(
     manifest_path: P,

src/helpers/path_ext.rs

@@ -0,0 +1,34 @@
+use std::path::{Component, Path, PathBuf};
+
+trait PathExt {
+    fn normalize_path(&self) -> PathBuf;
+}
+
+impl PathExt for Path {
+    fn normalize_path(&self) -> PathBuf {
+        let mut components = self.components().peekable();
+        let mut ret = if let Some(c @ Component::Prefix(..)) = components.peek().cloned() {
+            components.next();
+            PathBuf::from(c.as_os_str())
+        } else {
+            PathBuf::new()
+        };
+
+        for component in components {
+            match component {
+                Component::Prefix(..) => unreachable!(),
+                Component::RootDir => {
+                    ret.push(component.as_os_str());
+                }
+                Component::CurDir => {}
+                Component::ParentDir => {
+                    ret.pop();
+                }
+                Component::Normal(c) => {
+                    ret.push(c);
+                }
+            }
+        }
+        ret
+    }
+}