Fix sdist with local path dependencies on Windows

Changelog.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Support Aarch64 on OpenBSD in [#570](https://github.com/PyO3/maturin/pull/570)
 * Support Aarch64 on FreeBSD in [#571](https://github.com/PyO3/maturin/pull/571)
 * `Cargo.toml`'s `authors` field is now optional per Rust [RFC 3052](https://github.com/rust-lang/rfcs/blob/master/text/3052-optional-authors-field.md) in [#573](https://github.com/PyO3/maturin/pull/573)
+* Fix source distribution with local path dependencies on Windows in [#580](https://github.com/PyO3/maturin/pull/580)
 
 ## 0.10.6 - 2021-05-21
 

src/source_distribution.rs

@@ -170,9 +170,14 @@ pub fn source_distribution(
     sdist_include: Option<&Vec<String>>,
 ) -> Result<PathBuf> {
     // Parse ids in the format:
-    // some_path_dep 0.1.0 (path+file:///home/konsti/maturin/test-crates/some_path_dep)
+    // on unix:    some_path_dep 0.1.0 (path+file:///home/konsti/maturin/test-crates/some_path_dep)
+    // on windows: some_path_dep 0.1.0 (path+file:///C:/konsti/maturin/test-crates/some_path_dep)
     // This is not a good way to identify path dependencies, but I don't know a better one
-    let matcher = Regex::new(r"^(.*) .* \(path\+file://(.*)\)$").unwrap();
+    let matcher = if cfg!(windows) {
+        Regex::new(r"^(.*) .* \(path\+file:///(.*)\)$").unwrap()
+    } else {
+        Regex::new(r"^(.*) .* \(path\+file://(.*)\)$").unwrap()
+    };
     let resolve = cargo_metadata
         .resolve
         .as_ref()