unify path normalization utility (#6865)

1 files changed, 36 insertions, 0 deletions

diff --git a/core/normalize_path.rs b/core/normalize_path.rs
new file mode 100644
index 000000000..6a0e44896
--- /dev/null
+++ b/core/normalize_path.rs
@@ -0,0 +1,36 @@
+use std::path::Component;
+use std::path::Path;
+use std::path::PathBuf;
+
+/// Normalize all itermediate components of the path (ie. remove "./" and "../" components).
+/// Similar to `fs::canonicalize()` but doesn't resolve symlinks.
+///
+/// Taken from Cargo
+/// https://github.com/rust-lang/cargo/blob/af307a38c20a753ec60f0ad18be5abed3db3c9ac/src/cargo/util/paths.rs#L60-L85
+pub fn normalize_path(path: &Path) -> PathBuf {
+  let mut components = path.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
+}