1 files changed, 33 insertions, 0 deletions
diff --git a/vendor/gix-discover/src/parse.rs b/vendor/gix-discover/src/parse.rs
new file mode 100644
index 000000000..589718327
--- /dev/null
+++ b/vendor/gix-discover/src/parse.rs
@@ -0,0 +1,33 @@
+use std::path::PathBuf;
+
+use bstr::ByteSlice;
+
+///
+pub mod gitdir {
+    use bstr::BString;
+
+    /// The error returned by [`parse::gitdir()`][super::gitdir()].
+    #[derive(Debug, thiserror::Error)]
+    #[allow(missing_docs)]
+    pub enum Error {
+        #[error("Format should be 'gitdir: <path>', but got: {:?}", .input)]
+        InvalidFormat { input: BString },
+        #[error("Couldn't decode {:?} as UTF8", .input)]
+        IllformedUtf8 { input: BString },
+    }
+}
+
+/// Parse typical `gitdir` files as seen in worktrees and submodules.
+pub fn gitdir(input: &[u8]) -> Result<PathBuf, gitdir::Error> {
+    let path = input
+        .strip_prefix(b"gitdir: ")
+        .ok_or_else(|| gitdir::Error::InvalidFormat { input: input.into() })?
+        .as_bstr();
+    let path = path.trim_end().as_bstr();
+    if path.is_empty() {
+        return Err(gitdir::Error::InvalidFormat { input: input.into() });
+    }
+    Ok(gix_path::try_from_bstr(path)
+        .map_err(|_| gitdir::Error::IllformedUtf8 { input: input.into() })?
+        .into_owned())
+}