Make Git remote URL parsing more robust (#19924)

This PR improves the parsing of Git remote URLs in order to make
features that depend on them more robust.

Previously we were just treating these as plain strings and doing
one-off shotgun parsing to massage them into the right format. This
meant that we weren't accounting for edge cases in URL structure.

One of these cases was HTTPS Git URLs containing a username, which can
arise when using GitHub Enterprise (see
https://github.com/zed-industries/zed/issues/11160).

We now have a `RemoteUrl` typed to represent a parsed Git remote URL and
use the `Url` parser to parse it.

Release Notes:

- Improved the parsing of Git remote URLs to support additional
scenarios.

crates/git/src/remote.rs

@@ -0,0 +1,85 @@
+use derive_more::Deref;
+use url::Url;
+
+/// The URL to a Git remote.
+#[derive(Debug, PartialEq, Eq, Clone, Deref)]
+pub struct RemoteUrl(Url);
+
+impl std::str::FromStr for RemoteUrl {
+    type Err = url::ParseError;
+
+    fn from_str(input: &str) -> Result<Self, Self::Err> {
+        if input.starts_with("git@") {
+            // Rewrite remote URLs like `git@github.com:user/repo.git` to `ssh://git@github.com/user/repo.git`
+            let ssh_url = input.replacen(':', "/", 1).replace("git@", "ssh://git@");
+            Ok(RemoteUrl(Url::parse(&ssh_url)?))
+        } else {
+            Ok(RemoteUrl(Url::parse(input)?))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use pretty_assertions::assert_eq;
+
+    use super::*;
+
+    #[test]
+    fn test_parsing_valid_remote_urls() {
+        let valid_urls = vec![
+            (
+                "https://github.com/octocat/zed.git",
+                "https",
+                "github.com",
+                "/octocat/zed.git",
+            ),
+            (
+                "git@github.com:octocat/zed.git",
+                "ssh",
+                "github.com",
+                "/octocat/zed.git",
+            ),
+            (
+                "ssh://git@github.com/octocat/zed.git",
+                "ssh",
+                "github.com",
+                "/octocat/zed.git",
+            ),
+            (
+                "file:///path/to/local/zed",
+                "file",
+                "",
+                "/path/to/local/zed",
+            ),
+        ];
+
+        for (input, expected_scheme, expected_host, expected_path) in valid_urls {
+            let parsed = input.parse::<RemoteUrl>().expect("failed to parse URL");
+            let url = parsed.0;
+            assert_eq!(
+                url.scheme(),
+                expected_scheme,
+                "unexpected scheme for {input:?}",
+            );
+            assert_eq!(
+                url.host_str().unwrap_or(""),
+                expected_host,
+                "unexpected host for {input:?}",
+            );
+            assert_eq!(url.path(), expected_path, "unexpected path for {input:?}");
+        }
+    }
+
+    #[test]
+    fn test_parsing_invalid_remote_urls() {
+        let invalid_urls = vec!["not_a_url", "http://"];
+
+        for url in invalid_urls {
+            assert!(
+                url.parse::<RemoteUrl>().is_err(),
+                "expected \"{url}\" to not parse as a Git remote URL",
+            );
+        }
+    }
+}