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use crate::Error;
impl crate::Repository {
/// Create a graph data-structure capable of accelerating graph traversals and storing state of type `T` with each commit
/// it encountered.
///
/// Note that the `cache` will be used if present, and it's best obtained with
/// [`commit_graph_if_enabled()`](crate::Repository::commit_graph_if_enabled()).
///
/// Note that a commitgraph is only allowed to be used if `core.commitGraph` is true (the default), and that configuration errors are
/// ignored as well.
///
/// ### Performance
///
/// Note that the [Graph][gix_revwalk::Graph] can be sensitive to various object database settings that may affect the performance
/// of the commit walk.
pub fn revision_graph<'cache, T>(
&self,
cache: Option<&'cache gix_commitgraph::Graph>,
) -> gix_revwalk::Graph<'_, 'cache, T> {
gix_revwalk::Graph::new(&self.objects, cache)
}
/// Return a cache for commits and their graph structure, as managed by `git commit-graph`, for accelerating commit walks on
/// a low level.
///
/// Note that [`revision_graph()`][crate::Repository::revision_graph()] should be preferred for general purpose walks that don't
/// rely on the actual commit cache to be present, while leveraging the commit-graph if possible.
pub fn commit_graph(&self) -> Result<gix_commitgraph::Graph, Error> {
gix_commitgraph::at(self.objects.store_ref().path().join("info")).map_err(Into::into)
}
/// Return a newly opened commit-graph if it is available *and* enabled in the Git configuration.
pub fn commit_graph_if_enabled(
&self,
) -> Result<Option<gix_commitgraph::Graph>, super::commit_graph_if_enabled::Error> {
Ok(self
.config
.may_use_commit_graph()?
.then(|| gix_commitgraph::at(self.objects.store_ref().path().join("info")))
.transpose()
.or_else(|err| match err.downcast_any_ref::<std::io::Error>() {
Some(err) if err.kind() == std::io::ErrorKind::NotFound => Ok(None),
_ => Err(err.into_error()),
})?)
}
}