Allow creating detached remotes (#641)

* Add git_remote_create_detached fn definition

* Add Remote::create_detached associated fn

* Run cargo fmt

* Init crate on detached remote create

Author: Alovchin91

libgit2-sys/lib.rs

@@ -2041,6 +2041,7 @@ extern "C" {
         repo: *mut git_repository,
         url: *const c_char,
     ) -> c_int;
+    pub fn git_remote_create_detached(out: *mut *mut git_remote, url: *const c_char) -> c_int;
     pub fn git_remote_delete(repo: *mut git_repository, name: *const c_char) -> c_int;
     pub fn git_remote_free(remote: *mut git_remote);
     pub fn git_remote_name(remote: *const git_remote) -> *const c_char;

src/remote.rs

@@ -73,6 +73,22 @@ impl<'repo> Remote<'repo> {
         unsafe { raw::git_remote_is_valid_name(remote_name.as_ptr()) == 1 }
     }
 
+    /// Create a detached remote
+    ///
+    /// Create a remote with the given url in-memory. You can use this
+    /// when you have a URL instead of a remote's name.
+    /// Contrasted with an anonymous remote, a detached remote will not
+    /// consider any repo configuration values.
+    pub fn create_detached(url: &str) -> Result<Remote<'_>, Error> {
+        crate::init();
+        let mut ret = ptr::null_mut();
+        let url = CString::new(url)?;
+        unsafe {
+            try_call!(raw::git_remote_create_detached(&mut ret, url));
+            Ok(Binding::from_raw(ret))
+        }
+    }
+
     /// Get the remote's name.
     ///
     /// Returns `None` if this remote has not yet been named or if the name is