Blob urso/src/lib.rs
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#![forbid(unsafe_code)] #![deny(unreachable_pub)] #![warn( clippy::all, clippy::await_holding_lock, clippy::char_lit_as_u8, clippy::checked_conversions, clippy::dbg_macro, clippy::debug_assert_with_mut_call, clippy::doc_markdown, clippy::empty_enum, clippy::enum_glob_use, clippy::exit, clippy::explicit_deref_methods, clippy::explicit_into_iter_loop, clippy::explicit_iter_loop, clippy::expl_impl_clone_on_copy, clippy::fallible_impl_from, clippy::filter_map_next, clippy::flat_map_option, clippy::float_cmp_const, clippy::fn_params_excessive_bools, clippy::from_iter_instead_of_collect, clippy::if_let_mutex, clippy::implicit_clone, clippy::imprecise_flops, clippy::inefficient_to_string, clippy::invalid_upcast_comparisons, clippy::large_digit_groups, clippy::large_stack_arrays, clippy::large_types_passed_by_value, clippy::let_unit_value, clippy::linkedlist, clippy::lossy_float_literal, clippy::macro_use_imports, clippy::manual_ok_or, clippy::map_err_ignore, clippy::map_flatten, clippy::map_unwrap_or, clippy::match_on_vec_items, clippy::match_same_arms, clippy::match_wildcard_for_single_variants, clippy::match_wild_err_arm, clippy::mem_forget, clippy::mismatched_target_os, clippy::missing_enforced_import_renames, clippy::mutex_integer, clippy::mut_mut, clippy::needless_borrow, clippy::needless_continue, clippy::needless_for_each, clippy::option_option, clippy::path_buf_push_overwrite, clippy::ptr_as_ptr, clippy::rc_mutex, clippy::ref_option_ref, clippy::rest_pat_in_fully_bound_structs, clippy::same_functions_in_if_condition, clippy::semicolon_if_nothing_returned, clippy::single_match_else, clippy::string_add, clippy::string_add_assign, clippy::string_lit_as_bytes, clippy::string_to_string, clippy::todo, clippy::trait_duplication_in_bounds, clippy::unimplemented, clippy::unnested_or_patterns, clippy::unused_self, clippy::useless_transmute, clippy::verbose_file_reads, clippy::zero_sized_map_values, future_incompatible, nonstandard_style, rust_2018_idioms )] use error::wrap_err; use gix::{ bstr::BStr, object::tree, objs::tree::EntryKind, odb::HeaderExt, prelude::FindExt, traverse::commit::simple::Sorting, Object, Repository, Tree, }; // re-export pub use gix::{ actor::SignatureRef, date::time::Sign as TimeSign, date::Time, mailmap::Snapshot as Mailmap, objs::{tree::EntryMode, CommitRef, TagRef}, Commit, ObjectId, }; use std::{ borrow::Cow, collections::{BinaryHeap, HashSet}, path::{Path, PathBuf}, }; mod error; pub use error::Error; pub mod diff; pub mod blame; use blame::Annotated; mod rename; use rename::RenameError; mod mime; pub use mime::File; pub type Result<T> = std::result::Result<T, Error>; pub struct Urso { repo: Repository, pub max_bytes: u64, similarity_threshold: Option<f32>, } pub fn guess_mime(path: &str, data: &[u8]) -> (&'static str, bool) { mime::guess(path, data) } impl std::fmt::Debug for Urso { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.debug_struct("Urso") .field("repo", &self.git_dir()) .field("max_bytes", &self.max_bytes) .field("similarity_threshold", &self.similarity_threshold) .finish() } } #[derive(Clone)] pub struct UrsoHandle { inner: gix::ThreadSafeRepository, max_bytes: u64, similarity_threshold: Option<f32>, } impl std::fmt::Debug for UrsoHandle { fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { f.debug_struct("UrsoHandle") .field("repo", &self.inner.git_dir()) .field("max_bytes", &self.max_bytes) .field("similarity_threshold", &self.similarity_threshold) .finish() } } // options are intentionally NOT part of the equation impl PartialEq for UrsoHandle { fn eq(&self, other: &Self) -> bool { self.inner.git_dir().eq(other.inner.git_dir()) } } impl UrsoHandle { pub fn into_urso(self) -> Urso { let UrsoHandle { inner, max_bytes, similarity_threshold, } = self; Urso { repo: inner.into(), max_bytes, similarity_threshold, } } pub fn git_dir(&self) -> &Path { self.inner.git_dir() } } impl Urso { pub fn git_dir(&self) -> &Path { self.repo.git_dir() } pub fn open( dir: PathBuf, max_bytes: u64, similarity_threshold: Option<f32>, object_cache_size: usize, ) -> Result<Self> { let mut repo = gix::ThreadSafeRepository::open(dir)?.to_thread_local(); repo.object_cache_size(object_cache_size); Ok(Self { repo, max_bytes, similarity_threshold, }) } pub fn into_handle(self) -> UrsoHandle { let Urso { repo, max_bytes, similarity_threshold, } = self; UrsoHandle { inner: repo.into_sync(), max_bytes, similarity_threshold, } } // finds a blob located at base `path` whose filename matches // one of the given `alts` // for when you want to get the first of /path/{a,b,c,d,e} that // exists in the repo // cheaper than machinegunning get_file_contents since it avoids // decoding the intermediary path objects multiple times // (questionable benefit with tls object decoding cache) pub fn read_firstof<P: AsRef<Path>>( &self, head: ObjectId, path: P, alts: &[&str], buf: &mut Vec<u8>, ) -> Result<File> { let tree = self.get_commit_tree(head)?; // root: just try to find alts if path.as_ref().as_os_str().is_empty() { for &alt in alts { if let Some(found) = tree.find_entry(alt) { self.read_blob(found.object_id(), buf)?; return Ok(File::new(path.as_ref().join(alt), buf)); } } return Err(Error::NotFound); } let Some(entry) = find_path(&path, &tree, buf)? else { return Err(Error::NotFound); }; if entry.mode().is_tree() { let tree = entry .object() .map_err(|_discarded| Error::ObjectNotFound(entry.id().detach()))? .into_tree(); for &alt in alts { if let Some(found) = tree.find_entry(alt) { buf.clear(); self.read_blob(found.object_id(), buf)?; return Ok(File::new(path.as_ref().join(alt), buf)); } } Err(Error::NotFound) } else { Err(Error::NotFound) } } pub fn default_branch(&self) -> Result<String> { // XXX swallowing errors if let Some(head) = self.repo.head_ref().ok().flatten() { Ok(String::from_utf8_lossy(head.name().shorten()).into_owned()) } else { Err(Error::DetachedHead) } } pub fn rev_parse(&self, spec: &str) -> Result<ObjectId> { Ok(self .repo .rev_parse_single(BStr::new(spec.as_bytes()))? .detach()) } pub fn diff<F>(&self, base: Commit<'_>, parent: Option<Commit<'_>>, visitor: F) -> Result<()> where F: FnMut(diff::Event), { diff::diff_commits(&self, base, parent, visitor).map_err(|err| match err { diff::DiffError::Wrapped(w) => Error::Wrapped(w), diff::DiffError::Repo(e) => e, }) } pub fn list_path<V, P>(&self, head: ObjectId, dir: P, visitor: V) -> Result<()> where P: AsRef<std::path::Path>, V: FnMut(Entry<'_>), { let tree = self.get_commit_tree(head)?; if !dir.as_ref().is_relative() { return Err(Error::PathNotRelative(dir.as_ref().into())); } // empty dir == root of the repo. nothing to find if dir.as_ref().as_os_str().is_empty() { return list_tree(tree, visitor); } let mut buf = Vec::new(); if let Some(entry) = find_path(&dir, &tree, &mut buf)? { if !entry.mode().is_tree() { Err(Error::NotADir(dir.as_ref().into())) } else { list_tree(self.find_object(entry.object_id())?.into_tree(), visitor) } } else { Err(Error::NotFound) } } // NEEDSWORK: this is expensive AF // its nature is already costly: find the most recent // commit for each file in the tree // worst case IS walking the whole history until the // very first commit // a objectid->commit lookup would be cheap enough, but // i don't control the ingestion, so keeping it up to // date is not trivial pub fn list_with_log<V, P>(&self, commit_id: ObjectId, dir: P, mut visitor: V) -> Result<()> where // F(Entry, id-of-most-recent-commit) V: FnMut(Entry<'_>, ObjectId), P: AsRef<Path>, { let mut wanted = Vec::new(); self.list_path(commit_id, dir.as_ref(), |entry| { wanted.push(entry.to_owned()); })?; if wanted.is_empty() { return Ok(()); } let mut buf = Vec::new(); let base = dir.as_ref(); for rev in self .find_commit(commit_id)? .ancestors() .first_parent_only() .sorting(Sorting::ByCommitTimeNewestFirst) .all() .map_err(|e| wrap_err(format!("walking ancestry of commit {}", commit_id), e))? .flatten() { let commit = self.find_commit(rev.id)?; let commit_tree = commit_tree(&commit)?; let parent_tree = { if let Some(id) = commit.parent_ids().next() { self.get_commit_tree(id.into())? } else { // first commit self.repo.empty_tree() } }; // from last to first so that swap_remove is safe for idx in (0..wanted.len()).rev() { let t = &wanted[idx]; let target = base.join(&t.name); let cur = find_path(&target, &commit_tree, &mut buf)?.map(|entry| entry.id()); let prev = find_path(&target, &parent_tree, &mut buf)?.map(|entry| entry.id()); if cur != prev { let target = wanted.swap_remove(idx); visitor(target.as_entry(), commit.id); } } if wanted.is_empty() { break; } } debug_assert!(wanted.is_empty(), "missing tip commit for {wanted:#?}"); Ok(()) } // load data into buf; yield the guessed mime and wether it // can be treated as text // a shortcut for find_header + check-if-blob + guess_mime pub fn get_file_contents<P: AsRef<Path>>( &self, head: ObjectId, path: P, buf: &mut Vec<u8>, ) -> Result<(&'static str, bool)> { if path.as_ref().as_os_str().is_empty() { return Err(Error::NotFound); } let tree = self.get_commit_tree(head)?; if let Some(entry) = find_path(&path, &tree, buf)? { if entry.mode().is_blob() { buf.clear(); self.read_blob(entry.object_id(), buf)?; Ok(mime::guess(path, buf)) } else { Err(Error::NotAFile(path.as_ref().into())) } } else { Err(Error::NotFound) } } pub fn annotate(&self, commit: ObjectId, path: PathBuf) -> Result<()> { // Must be able to find the given path as a blob // using commit as the head let mut buf = Vec::new(); let tree = self.get_commit_tree(commit)?; if let Some(e) = find_path(&path, &tree, &mut buf)? { if !e.mode().is_blob() { return Err(Error::NotAFile(path)); } } else { return Err(Error::NotFound); } let mut versions = Vec::new(); self.path_rev_walk( commit, path, WalkOptions { rename_similarity_threshold: self.similarity_threshold, follow_strategy: FollowStrategy::FirstParent, stop_when_path_disappears: true, }, |info: Commit<'_>, _: &Path, _prev, cur| -> bool { if let Some(ver) = cur { versions.push(Version { commit: info.id, object: ver, }); } true }, )?; versions.reverse(); let out = crate::blame::annotate(&versions[..], self)?; let mut lineno = 1; let Annotated { content, annotations, } = out; for b in annotations { let commit = b.id.commit.to_hex_with_len(11); for idx in b.lines { println!("{} {:3} {}", commit, lineno, content[idx as usize]); lineno += 1; } } Ok(()) } // looooooooooong perf tail // may walk all the way to the first commit pub fn tip<P: AsRef<Path>>(&self, head: ObjectId, path: P) -> Result<ObjectId> { let mut found = None; // empty path is the root of the repo // the most recent commit is whatever head is at if path.as_ref().as_os_str().is_empty() { return Ok(head); } self.path_rev_walk( head, path.as_ref(), WalkOptions { follow_strategy: FollowStrategy::Default, // ensures that the path exists in the // tree of the commit `head` points at // i.e. exits early when not found instead of // climbing the ancestry stop_when_path_disappears: true, // want the first commit only rename_similarity_threshold: None, }, |info: Commit<'_>, _: &Path, _, _| { found = Some(info.id); false }, )?; if let Some(commit) = found { Ok(commit) } else { Err(Error::NotFound) } } pub fn log<P, F>(&self, head: ObjectId, path: P, visitor: F) -> Result<()> where P: AsRef<Path>, F: FnMut(Commit<'_>, &Path, Option<ObjectId>, Option<ObjectId>) -> bool, { let tree = self.get_commit_tree(head)?; let mut buf = Vec::new(); if find_entry(path.as_ref(), &tree, &mut buf)?.is_none() { return Err(Error::NotFound); } self.path_rev_walk( head, path, WalkOptions { rename_similarity_threshold: self.similarity_threshold, follow_strategy: FollowStrategy::Default, stop_when_path_disappears: false, }, visitor, )?; Ok(()) } pub fn local_refs<F>(&self, mut visitor: F) -> Result<()> where F: FnMut(RefKind<'_>) -> bool, { 'refs: for mut r in self .repo .references() .map_err(|e| wrap_err("preparing to list all refs".into(), e))? .all() .map_err(|e| wrap_err("iterating over all refs".into(), e))? .flatten() { // XXX this depends on the call order: // peel_to_id_in_place() will overwrite the ref id // with the fully peeled one. // for annotated tags the ref before peeling is // interesting, so must get id before peeling let Some(id) = r.try_id().map(|id| id.detach()) else { // don't care about symbolic refs continue 'refs; }; r.peel_to_id_in_place() .map_err(|e| wrap_err("peeling ref".into(), e))?; let Some((category, name)) = r.name().category_and_short_name() else { continue 'refs; }; match category { gix::refs::Category::Tag => { let head = r.inner.peeled.unwrap(); // i think i can assume that if head != id, the // tag is annotated match self.find_object(id)?.try_into_tag() { Ok(obj) => { let tag = obj.decode().map_err(|_discarded| Error::Decode(id))?; if !visitor(RefKind::Tag { tag, head }) { break 'refs; } } Err(_ignored) => { if !visitor(RefKind::PlainTag { name, head }) { break 'refs; } } } } gix::refs::Category::LocalBranch => { if !visitor(RefKind::Branch { name, head: r.id().detach(), }) { break 'refs; } } _ignored => (), }; } Ok(()) } fn find_object(&self, id: ObjectId) -> Result<Object<'_>> { self.repo .try_find_object(id) .map_err(|e| wrap_err(format!("searching for object {}", id), e))? .ok_or(Error::ObjectNotFound(id)) } pub fn find_commit(&self, id: ObjectId) -> Result<Commit<'_>> { self.find_object(id)? .try_into_commit() .map_err(|e| wrap_err(format!("reading object {}", id), e).into()) } fn get_commit_tree(&self, id: ObjectId) -> Result<Tree<'_>> { commit_tree(&self.find_commit(id)?) } pub fn read_blob(&self, id: ObjectId, buf: &mut Vec<u8>) -> Result<()> { self.repo .objects .find_blob(&id, buf) .map_err(|e| wrap_err(format!("reading blob id {}", id), e))?; Ok(()) } pub fn find_header<P: AsRef<Path>>( &self, head: ObjectId, path: P, ) -> Result<Option<diff::Header>> { let mut tree = self.get_commit_tree(head)?; match tree.peel_to_entry_by_path(path.as_ref()) { Ok(found) => { if let Some(entry) = found { if entry.mode().is_commit() { Ok(Some(diff::Header { id: entry.object_id(), size: 0, kind: gix::objs::Kind::Commit, })) } else { Ok(Some(self.get_header(entry.object_id())?)) } } else { Ok(None) } } Err(gix::object::find::existing::Error::NotFound { oid }) => { Err(Error::ObjectNotFound(oid)) } Err(e) => Err(wrap_err( format!("looking for path {:?} at tree {}", path.as_ref(), tree.id), e, ) .into()), } } fn compute_similarity(&self, previous: ObjectId, current: ObjectId) -> Result<f32> { let mut prev = Vec::new(); self.read_blob(previous, &mut prev)?; let mut cur = Vec::new(); self.read_blob(current, &mut cur)?; let prev_text = self.blob_bytes_to_string(&prev)?; let cur_text = self.blob_bytes_to_string(&cur)?; let result = diff::similarity(prev_text.as_ref(), cur_text.as_ref()); Ok(result) } // XXX fails on symlinks, need to know entry mode before calling fn get_header(&self, id: ObjectId) -> Result<diff::Header> { let h = self .repo .objects .header(id) .map_err(|_discarded| Error::ObjectNotFound(id))?; Ok(diff::Header { id, size: h.size(), kind: h.kind(), }) } // XXX walks until the beginning if the path doesn't exist fn path_rev_walk<P, F>( &self, head: ObjectId, path: P, options: WalkOptions, mut visitor: F, ) -> Result<()> where P: AsRef<Path>, F: PathCommitVisitor, { let mut path = path.as_ref().to_path_buf(); let mut queue = OnceQueue::new(); macro_rules! enqueue { ($id:expr) => { let commit = self.find_commit($id)?; let time = commit.time().map_err(|_| Error::Decode($id))?; queue.insert(ByCommitTime { time, id: commit.id, }); }; } enqueue!(head); let mut parent_ids = Vec::new(); let mut buf = Vec::new(); while let Some(info) = queue.remove() { let ByCommitTime { time: _, id: commit_id, } = info; let commit = self.find_commit(commit_id)?; let commit_tree = self.get_commit_tree(commit_id)?; let entry = find_entry(&path, &commit_tree, &mut buf)?; let current = entry.as_ref().map(|e| e.0); if options.stop_when_path_disappears && current.is_none() { continue; } parent_ids.clear(); commit .parent_ids() .for_each(|id| parent_ids.push(id.detach())); let num_parents = parent_ids.len(); // Decide which parent(s) to follow and yield back the one // to compare against let parent_id = match num_parents { // root commit. no parent, nothing to follow 0 => { if current.is_some() && !visitor.visit(commit, &path, None, current) { break; } continue; } // single parent, follow it 1 => { enqueue!(parent_ids[0]); parent_ids[0] } _merge_commit => { let mut first_treesame_idx = None; for (idx, &parent_id) in parent_ids.iter().enumerate() { let parent_tree = self.get_commit_tree(parent_id)?; let previous = find_path(&path, &parent_tree, &mut buf)? .map(|entry| entry.object_id()); if previous == current { first_treesame_idx = Some(idx); break; } } match options.follow_strategy { FollowStrategy::Default => {} FollowStrategy::AllParents => { first_treesame_idx = None; } FollowStrategy::FirstParent => { first_treesame_idx = Some(0); } }; if let Some(idx) = first_treesame_idx { let parent_id = parent_ids[idx]; enqueue!(parent_id); parent_id } else { for &id in &parent_ids { enqueue!(id); } parent_ids[0] } } }; let parent_tree = self.get_commit_tree(parent_id)?; let mut previous = find_entry(&path, &parent_tree, &mut buf)?.map(|entry| entry.0); let mut has_renamed = false; if options.rename_similarity_threshold.is_some() && previous.is_none() // only try to detect renames for blob types && entry.is_some_and(|e| matches!(e.1,EntryKind::Blob|EntryKind::BlobExecutable)) { tracing::trace!( commit_id = tracing::field::debug(commit_id), parent_id = tracing::field::debug(parent_id), path = tracing::field::debug(&path), "initiating rename detection" ); if let Some((new_path, new_id)) = rename::find_rename(self, &path, current.unwrap(), &commit_tree, &parent_tree) .map_err(|e| match e { RenameError::Repo(inner) => inner, RenameError::Wrapped(w) => Error::Wrapped(w), })? { tracing::debug!( commit_id = tracing::field::debug(commit_id), parent_id = tracing::field::debug(parent_id), new_path = tracing::field::debug(&new_path), old_path = tracing::field::debug(path), "rename detected" ); path = new_path; previous = Some(new_id); has_renamed = true; } else { tracing::trace!("no rename detected"); } } // When a blob is renamed but its contents remain unchanged // `previous` and `current` will be the same. Since the commit // is likely interesting to the calee, the callback is fired if (has_renamed || current != previous) && !visitor.visit(commit, &path, previous, current) { break; } } Ok(()) } // XXX being lossy here can lead to junk for // repositories that hold binary files that can't be // mime-guessed from their name #[allow(clippy::unused_self)] // TODO should know how to decode proper fn blob_bytes_to_string<'a>(&self, data: &'a [u8]) -> Result<Cow<'a, str>> { Ok(Cow::Borrowed( std::str::from_utf8(data).map_err(|e| Error::ToString(Box::new(e)))?, )) } } #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)] struct Version { commit: ObjectId, object: ObjectId, } impl blame::Repo<Version> for &Urso { type Error = Error; fn load(&self, id: &Version, buf: &mut Vec<u8>) -> std::result::Result<(), Self::Error> { self.read_blob(id.object, buf) } fn decode_text<'a>( &self, data: &'a [u8], ) -> std::result::Result<std::borrow::Cow<'a, str>, Self::Error> { self.blob_bytes_to_string(data) } } impl diff::Repo for &Urso { type Error = Error; fn max_bytes(&self) -> u64 { self.max_bytes } fn empty_tree(&self) -> Tree<'_> { self.repo.empty_tree() } fn load(&self, id: ObjectId, buf: &mut Vec<u8>) -> std::result::Result<(), Self::Error> { self.read_blob(id, buf) } fn get_header(&self, id: ObjectId) -> std::result::Result<diff::Header, Self::Error> { Urso::get_header(self, id) } fn decode_text<'a>( &self, data: &'a [u8], ) -> std::result::Result<std::borrow::Cow<'a, str>, Self::Error> { self.blob_bytes_to_string(data) } fn min_similarity(&self) -> Option<f32> { self.similarity_threshold } } impl rename::Repo for &Urso { type Error = Error; fn similarity(&self, prev: ObjectId, cur: ObjectId) -> std::result::Result<f32, Self::Error> { self.compute_similarity(prev, cur) } fn get_header(&self, id: ObjectId) -> std::result::Result<diff::Header, Self::Error> { Urso::get_header(self, id) } fn min_similarity(&self) -> f32 { self.similarity_threshold.unwrap_or(1.0) } } #[derive(Debug)] struct ByCommitTime { time: Time, id: ObjectId, } impl PartialEq for ByCommitTime { fn eq(&self, other: &Self) -> bool { self.id == other.id } } impl Eq for ByCommitTime {} impl PartialOrd for ByCommitTime { fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> { Some(self.cmp(other)) } } impl Ord for ByCommitTime { fn cmp(&self, other: &Self) -> std::cmp::Ordering { self.time .cmp(&other.time) .then_with(|| self.id.cmp(&other.id)) } } struct OnceQueue { items: BinaryHeap<ByCommitTime>, seen: HashSet<ObjectId>, } impl OnceQueue { pub(crate) fn new() -> Self { Self { items: Default::default(), seen: Default::default(), } } pub(crate) fn insert(&mut self, info: ByCommitTime) -> bool { if self.seen.insert(info.id) { self.items.push(info); true } else { false } } pub(crate) fn remove(&mut self) -> Option<ByCommitTime> { self.items.pop() } } #[derive(Default, Clone)] struct WalkOptions { rename_similarity_threshold: Option<f32>, follow_strategy: FollowStrategy, stop_when_path_disappears: bool, } #[derive(PartialEq, Default, Clone)] pub enum FollowStrategy { #[default] Default, AllParents, FirstParent, } trait PathCommitVisitor { fn visit( &mut self, commit: Commit<'_>, path: &Path, previous: Option<ObjectId>, current: Option<ObjectId>, ) -> bool; } impl<F> PathCommitVisitor for F where F: FnMut(Commit<'_>, &Path, Option<ObjectId>, Option<ObjectId>) -> bool, { fn visit( &mut self, commit: Commit<'_>, path: &Path, previous: Option<ObjectId>, current: Option<ObjectId>, ) -> bool { (self)(commit, path, previous, current) } } #[derive(Debug, Clone)] pub struct Entry<'a> { pub mode: EntryMode, pub name: &'a [u8], pub id: ObjectId, } impl<'a> Entry<'a> { fn to_owned(&self) -> OwnedEntry { OwnedEntry { mode: self.mode, id: self.id, name: String::from_utf8_lossy(self.name).into_owned(), } } } #[derive(Debug)] struct OwnedEntry { mode: EntryMode, name: String, id: ObjectId, } impl OwnedEntry { fn as_entry(&self) -> Entry<'_> { Entry { mode: self.mode, id: self.id, name: self.name.as_bytes(), } } } fn list_tree<V>(tree: Tree<'_>, mut visitor: V) -> Result<()> where // F(id, name, mode) V: FnMut(Entry<'_>), { for maybe_entry in tree.iter() { let entry = maybe_entry.map_err(|e| wrap_err(format!("listing items for tree {}", tree.id), e))?; visitor(Entry { mode: entry.mode(), name: entry.filename(), id: entry.object_id(), }); } Ok(()) } fn commit_tree<'a>(commit: &Commit<'a>) -> Result<Tree<'a>> { commit .tree() .map_err(|e| wrap_err(format!("reading tree for commit {}", commit.id), e).into()) } fn find_path<'a, P: AsRef<Path>>( path: P, tree: &Tree<'a>, buf: &mut Vec<u8>, ) -> Result<Option<tree::Entry<'a>>> { match tree.lookup_entry_by_path(&path, buf) { Ok(found) => Ok(found), Err(gix::object::find::existing::Error::NotFound { oid }) => { Err(Error::ObjectNotFound(oid)) } Err(e) => Err(wrap_err( format!("looking for path {:?} at tree {}", path.as_ref(), tree.id), e, ) .into()), } } fn find_entry<P: AsRef<Path>>( path: P, tree: &Tree<'_>, buf: &mut Vec<u8>, ) -> Result<Option<(ObjectId, EntryKind)>> { if path.as_ref().as_os_str().is_empty() { Ok(Some((tree.id, EntryKind::Tree))) } else { Ok(find_path(path, tree, buf)?.map(|e| (e.object_id(), e.mode().kind()))) } } #[derive(Debug)] pub enum RefKind<'a> { PlainTag { name: &'a [u8], head: ObjectId }, Tag { tag: TagRef<'a>, head: ObjectId }, Branch { name: &'a [u8], head: ObjectId }, } pub mod config { pub use gix::config::parse::Error; use gix::config::parse::{from_bytes, Event}; trait EntryVisitor { fn visit( &mut self, section: &str, subsection: Option<&str>, key: &str, value: &[u8], ) -> bool; } pub fn parse<V>(data: &[u8], mut visitor: V) -> Result<(), Error> where // F(section, subsection, key, value) -> continue_parsing V: FnMut(&str, Option<&str>, &str, &[u8]) -> bool, { let mut stop = false; let mut section = Default::default(); // not a plain option so i can reuse the buffer let mut subsection = Default::default(); let mut subsection_is_set = false; // XXX section names are verified to be alphanumeric and their // container implements AsRef<str>, but the accessor erases it // by yielding &BStr instead of &Name (or &str) macro_rules! assume_str { ($bytes:expr) => { std::str::from_utf8($bytes).unwrap_or_default() }; } let mut key = String::default(); let mut parial_value = Vec::new(); from_bytes(data, &mut |event| { if stop { return; } match event { Event::SectionHeader(head) => { head.name().clone_into(&mut section); subsection_is_set = head.subsection_name().is_some_and(|sub| { sub.clone_into(&mut subsection); true }); } Event::SectionKey(section_key) => { section_key.as_ref().clone_into(&mut key); } Event::Value(value) => { let mut sub = None; if subsection_is_set { sub = Some(assume_str!(&subsection)); } stop = !visitor(assume_str!(§ion), sub, &key, &value); } Event::ValueNotDone(part) => { parial_value.extend_from_slice(&part); } Event::ValueDone(part) => { parial_value.extend_from_slice(&part); let mut sub = None; if subsection_is_set { sub = Some(assume_str!(&subsection)); } stop = !visitor(assume_str!(§ion), sub, &key, &parial_value); parial_value.clear(); } _ => (), } })?; Ok(()) } #[cfg(test)] mod tests { use super::*; #[test] fn parse_ok() { let input = " [urso] setting = hello \ world another= HEAD [many \"a\"] name = first [many \"b\"] name = second "; let mut expects = vec![ ("urso", None, "setting", "hello world"), ("urso", None, "another", "HEAD"), ("many", Some("a"), "name", "first"), ("many", Some("b"), "name", "second"), ]; let visitor = |section: &str, sub: Option<&str>, key: &str, value: &[u8]| -> bool { let wanted = expects.remove(0); assert_eq!(wanted.0, section, "wrong section"); assert_eq!(wanted.1, sub, "wrong subsection"); assert_eq!(wanted.2, key, "wrong key"); assert_eq!( wanted.3, std::str::from_utf8(value).expect("valid utf8"), "wrong value" ); true }; parse(input.as_bytes(), visitor).expect("no error parsing"); assert!(expects.is_empty()); } } } |