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use crate::{filter, repository::IndexPersistedOrInMemory, Id, Repository};
///
pub mod pipeline {
/// The error returned by [Repository::filter_pipeline()][super::Repository::filter_pipeline()].
#[derive(Debug, thiserror::Error)]
#[allow(missing_docs)]
pub enum Error {
#[error("Could not obtain head commit of bare repository")]
HeadCommit(#[from] crate::reference::head_commit::Error),
#[error(transparent)]
DecodeCommit(#[from] gix_object::decode::Error),
#[error("Could not create index from tree at HEAD^{{tree}}")]
TreeTraverse(#[from] gix_traverse::tree::breadthfirst::Error),
#[error(transparent)]
BareAttributes(#[from] crate::config::attribute_stack::Error),
#[error(transparent)]
WorktreeIndex(#[from] crate::worktree::open_index::Error),
#[error(transparent)]
Init(#[from] crate::filter::pipeline::options::Error),
}
}
impl Repository {
/// Configure a pipeline for converting byte buffers to the worktree representation, and byte streams to the git-internal
/// representation. Also return the index that was used when initializing the pipeline as it may be useful when calling
/// [convert_to_git()][filter::Pipeline::convert_to_git()].
/// Bare repositories will either use `HEAD^{tree}` for accessing all relevant worktree files or the given `tree_if_bare`.
///
/// Note that this is considered a primitive as it operates on data directly and will not have permanent effects.
/// We also return the index that was used to configure the attributes cache (for accessing `.gitattributes`), which can be reused
/// after it was possibly created from a tree, an expensive operation.
///
/// ### Performance
///
/// Note that when in a repository with worktree, files in the worktree will be read with priority, which causes at least a stat
/// each time the directory is changed. This can be expensive if access isn't in sorted order, which would cause more then necessary
/// stats: one per directory.
pub fn filter_pipeline(
&self,
tree_if_bare: Option<gix_hash::ObjectId>,
) -> Result<(filter::Pipeline<'_>, IndexPersistedOrInMemory), pipeline::Error> {
let (cache, index) = if self.is_bare() {
let index = self.index_from_tree(&tree_if_bare.map_or_else(
|| {
self.head_commit()
.map_err(pipeline::Error::from)
.and_then(|c| c.tree_id().map(Id::detach).map_err(Into::into))
},
Ok,
)?)?;
let cache = self.attributes_only(&index, gix_worktree::stack::state::attributes::Source::IdMapping)?;
(cache, IndexPersistedOrInMemory::InMemory(index))
} else {
let index = self.index()?;
let cache = self.attributes_only(
&index,
gix_worktree::stack::state::attributes::Source::WorktreeThenIdMapping,
)?;
(cache, IndexPersistedOrInMemory::Persisted(index))
};
Ok((filter::Pipeline::new(self, cache.detach())?, index))
}
}
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