// Copyright 2024 The Jujutsu Authors//// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at//// https://www.apache.org/licenses/LICENSE-2.0//// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License. //! Methods that allow annotation (attribution and blame) for a file in a//! repository.//!//! TODO: Add support for different blame layers with a trait in the future.//! Like commit metadata and more. use std::collections::HashMap;use std::collections::hash_map;use std::iter;use std::ops::Range;use std::sync::Arc; use bstr::BStr;use bstr::BString;use itertools::Itertools as _;use pollster::FutureExt as _; use crate::backend::BackendError;use crate::backend::BackendResult;use crate::backend::CommitId;use crate::commit::Commit;use crate::conflicts::ConflictMarkerStyle;use crate::conflicts::ConflictMaterializeOptions;use crate::conflicts::MaterializedTreeValue;use crate::conflicts::materialize_merge_result_to_bytes;use crate::conflicts::materialize_tree_value;use crate::diff::ContentDiff;use crate::diff::DiffHunkKind;use crate::files::FileMergeHunkLevel;use crate::fileset::FilesetExpression;use crate::graph::GraphEdge;use crate::merge::SameChange;use crate::merged_tree::MergedTree;use crate::repo::Repo;use crate::repo_path::RepoPath;use crate::repo_path::RepoPathBuf;use crate::revset::ResolvedRevsetExpression;use crate::revset::RevsetEvaluationError;use crate::revset::RevsetExpression;use crate::revset::RevsetFilterPredicate;use crate::store::Store;use crate::tree_merge::MergeOptions; /// Annotation results for a specific file#[derive(Clone, Debug)]pub struct FileAnnotation {    line_map: OriginalLineMap,    text: BString,} impl FileAnnotation {    /// Returns iterator over `(line_origin, line)`s.    ///    /// For each line, `Ok(line_origin)` returns information about the    /// originator commit of the line. If no originator commit was found    /// within the domain, `Err(line_origin)` should be set. It points to the    /// commit outside of the domain where the search stopped.    ///    /// The `line` includes newline character.    pub fn line_origins(&self) -> impl Iterator<Item = (Result<&LineOrigin, &LineOrigin>, &BStr)> {        itertools::zip_eq(&self.line_map, self.text.split_inclusive(|b| *b == b'\n'))            .map(|(line_origin, line)| (line_origin.as_ref(), line.as_ref()))    }     /// Returns iterator over `(commit_id, line)`s.    ///    /// For each line, `Ok(commit_id)` points to the originator commit of the    /// line. If no originator commit was found within the domain,    /// `Err(commit_id)` should be set. It points to the commit outside of the    /// domain where the search stopped.    ///    /// The `line` includes newline character.    pub fn lines(&self) -> impl Iterator<Item = (Result<&CommitId, &CommitId>, &BStr)> {        itertools::zip_eq(            self.commit_ids(),            self.text                .split_inclusive(|b| *b == b'\n')                .map(AsRef::as_ref),        )    }     /// Returns iterator over `(commit_id, line_range)`s.    ///    /// See [`Self::lines()`] for `commit_id`s.    ///    /// The `line_range` is a slice range in the file `text`. Consecutive ranges    /// having the same `commit_id` are not compacted.    pub fn line_ranges(        &self,    ) -> impl Iterator<Item = (Result<&CommitId, &CommitId>, Range<usize>)> {        let ranges = self            .text            .split_inclusive(|b| *b == b'\n')            .scan(0, |total, line| {                let start = *total;                *total += line.len();                Some(start..*total)            });        itertools::zip_eq(self.commit_ids(), ranges)    }     /// Returns iterator over compacted `(commit_id, line_range)`s.    ///    /// Consecutive ranges having the same `commit_id` are merged into one.    pub fn compact_line_ranges(        &self,    ) -> impl Iterator<Item = (Result<&CommitId, &CommitId>, Range<usize>)> {        let mut ranges = self.line_ranges();        let mut acc = ranges.next();        iter::from_fn(move || {            let (acc_commit_id, acc_range) = acc.as_mut()?;            for (cur_commit_id, cur_range) in ranges.by_ref() {                if *acc_commit_id == cur_commit_id {                    acc_range.end = cur_range.end;                } else {                    return acc.replace((cur_commit_id, cur_range));                }            }            acc.take()        })    }     /// File content at the starting commit.    pub fn text(&self) -> &BStr {        self.text.as_ref()    }     fn commit_ids(&self) -> impl Iterator<Item = Result<&CommitId, &CommitId>> {        self.line_map.iter().map(|line_origin| {            line_origin                .as_ref()                .map(|origin| &origin.commit_id)                .map_err(|origin| &origin.commit_id)        })    }} /// Annotation process for a specific file.#[derive(Clone, Debug)]pub struct FileAnnotator {    // If we add copy-tracing support, file_path might be tracked by state.    file_path: RepoPathBuf,    starting_text: BString,    state: AnnotationState,} impl FileAnnotator {    /// Initializes annotator for a specific file in the `starting_commit`.    ///    /// If the file is not found, the result would be empty.    pub fn from_commit(starting_commit: &Commit, file_path: &RepoPath) -> BackendResult<Self> {        let source = Source::load(starting_commit, file_path)?;        Ok(Self::with_source(starting_commit.id(), file_path, source))    }     /// Initializes annotator for a specific file path starting with the given    /// content.    ///    /// The file content at the `starting_commit` is set to `starting_text`.    /// This is typically one of the file contents in the conflict or    /// merged-parent tree.    pub fn with_file_content(        starting_commit_id: &CommitId,        file_path: &RepoPath,        starting_text: impl Into<Vec<u8>>,    ) -> Self {        let source = Source::new(BString::new(starting_text.into()));        Self::with_source(starting_commit_id, file_path, source)    }     fn with_source(        starting_commit_id: &CommitId,        file_path: &RepoPath,        mut source: Source,    ) -> Self {        source.fill_line_map();        let starting_text = source.text.clone();        let state = AnnotationState {            original_line_map: (0..source.line_map.len())                .map(|line_number| {                    Err(LineOrigin {                        commit_id: starting_commit_id.clone(),                        line_number,                    })                })                .collect(),            commit_source_map: HashMap::from([(starting_commit_id.clone(), source)]),            num_unresolved_roots: 0,        };        Self {            file_path: file_path.to_owned(),            starting_text,            state,        }    }     /// Computes line-by-line annotation within the `domain`.    ///    /// The `domain` expression narrows the range of ancestors to search. It    /// will be intersected as `domain & ::pending_commits & files(file_path)`.    /// The `pending_commits` is assumed to be included in the `domain`.    pub fn compute(        &mut self,        repo: &dyn Repo,        domain: &Arc<ResolvedRevsetExpression>,    ) -> Result<(), RevsetEvaluationError> {        process_commits(repo, &mut self.state, domain, &self.file_path)    }     /// Remaining commit ids to visit from.    pub fn pending_commits(&self) -> impl Iterator<Item = &CommitId> {        self.state.commit_source_map.keys()    }     /// Returns the current state as line-oriented annotation.    pub fn to_annotation(&self) -> FileAnnotation {        // Just clone the line map. We might want to change the underlying data        // model something akin to interleaved delta in order to get annotation        // at a certain ancestor commit without recomputing.        FileAnnotation {            line_map: self.state.original_line_map.clone(),            text: self.starting_text.clone(),        }    }} /// Intermediate state of file annotation.#[derive(Clone, Debug)]struct AnnotationState {    original_line_map: OriginalLineMap,    /// Commits to file line mappings and contents.    commit_source_map: HashMap<CommitId, Source>,    /// Number of unresolved root commits in `commit_source_map`.    num_unresolved_roots: usize,} /// Line mapping and file content at a certain commit.#[derive(Clone, Debug)]struct Source {    /// Mapping of line numbers in the file at the current commit to the    /// starting file, sorted by the line numbers at the current commit.    line_map: Vec<(usize, usize)>,    /// File content at the current commit.    text: BString,} impl Source {    fn new(text: BString) -> Self {        Self {            line_map: Vec::new(),            text,        }    }     fn load(commit: &Commit, file_path: &RepoPath) -> Result<Self, BackendError> {        let tree = commit.tree();        let text = get_file_contents(commit.store(), file_path, &tree).block_on()?;        Ok(Self::new(text))    }     fn fill_line_map(&mut self) {        let lines = self.text.split_inclusive(|b| *b == b'\n');        self.line_map = lines.enumerate().map(|(i, _)| (i, i)).collect();    }} /// List of origins for each line, indexed by line numbers in the/// starting file.type OriginalLineMap = Vec<Result<LineOrigin, LineOrigin>>; /// Information about the origin of an annotated line.#[derive(Clone, Debug, Eq, PartialEq)]pub struct LineOrigin {    /// Commit ID where the line was introduced.    pub commit_id: CommitId,    /// 0-based line number of the line in the origin commit.    pub line_number: usize,} /// Starting from the source commits, compute changes at that commit relative to/// its direct parents, updating the mappings as we go.fn process_commits(    repo: &dyn Repo,    state: &mut AnnotationState,    domain: &Arc<ResolvedRevsetExpression>,    file_name: &RepoPath,) -> Result<(), RevsetEvaluationError> {    let predicate = RevsetFilterPredicate::File(FilesetExpression::file_path(file_name.to_owned()));    // TODO: If the domain isn't a contiguous range, changes masked out by it    // might not be caught by the closest ancestor revision. For example,    // domain=merges() would pick up almost nothing because merge revisions    // are usually empty. Perhaps, we want to query `files(file_path,    // within_sub_graph=domain)`, not `domain & files(file_path)`.    let heads = RevsetExpression::commits(state.commit_source_map.keys().cloned().collect());    let revset = heads        .union(&domain.intersection(&heads.ancestors()).filtered(predicate))        .evaluate(repo)?;     state.num_unresolved_roots = 0;    for node in revset.iter_graph() {        let (commit_id, edge_list) = node?;        process_commit(repo, file_name, state, &commit_id, &edge_list)?;        if state.commit_source_map.len() == state.num_unresolved_roots {            // No more lines to propagate to ancestors.            break;        }    }    Ok(())} /// For a given commit, for each parent, we compare the version in the parent/// tree with the current version, updating the mappings for any lines in/// common. If the parent doesn't have the file, we skip it.fn process_commit(    repo: &dyn Repo,    file_name: &RepoPath,    state: &mut AnnotationState,    current_commit_id: &CommitId,    edges: &[GraphEdge<CommitId>],) -> Result<(), BackendError> {    let Some(mut current_source) = state.commit_source_map.remove(current_commit_id) else {        return Ok(());    };     for parent_edge in edges {        let parent_commit_id = &parent_edge.target;        let parent_source = match state.commit_source_map.entry(parent_commit_id.clone()) {            hash_map::Entry::Occupied(entry) => entry.into_mut(),            hash_map::Entry::Vacant(entry) => {                let commit = repo.store().get_commit(entry.key())?;                entry.insert(Source::load(&commit, file_name)?)            }        };         // For two versions of the same file, for all the lines in common,        // overwrite the new mapping in the results for the new commit. Let's        // say I have a file in commit A and commit B. We know that according to        // local line_map, in commit A, line 3 corresponds to line 7 of the        // starting file. Now, line 3 in Commit A corresponds to line 6 in        // commit B. Then, we update local line_map to say that "Commit B line 6        // goes to line 7 of the starting file". We repeat this for all lines in        // common in the two commits.        let mut current_lines = current_source.line_map.iter().copied().peekable();        let mut new_current_line_map = Vec::new();        let mut new_parent_line_map = Vec::new();        copy_same_lines_with(            &current_source.text,            &parent_source.text,            |current_start, parent_start, count| {                new_current_line_map                    .extend(current_lines.peeking_take_while(|&(cur, _)| cur < current_start));                while let Some((current, starting)) =                    current_lines.next_if(|&(cur, _)| cur < current_start + count)                {                    let parent = parent_start + (current - current_start);                    new_parent_line_map.push((parent, starting));                }            },        );        new_current_line_map.extend(current_lines);        current_source.line_map = new_current_line_map;        parent_source.line_map = if parent_source.line_map.is_empty() {            new_parent_line_map        } else {            itertools::merge(parent_source.line_map.iter().copied(), new_parent_line_map).collect()        };        if parent_source.line_map.is_empty() {            state.commit_source_map.remove(parent_commit_id);        } else if parent_edge.is_missing() {            // If an omitted parent had the file, leave these lines unresolved.            // The origin of the unresolved lines is represented as            // Err(LineOrigin { parent_commit_id, parent_line_number }).            for &(parent_line_number, starting_line_number) in &parent_source.line_map {                state.original_line_map[starting_line_number] = Err(LineOrigin {                    commit_id: parent_commit_id.clone(),                    line_number: parent_line_number,                });            }            state.num_unresolved_roots += 1;        }    }     // Once we've looked at all parents of a commit, any leftover lines must be    // original to the current commit, so we save this information in    // original_line_map.    for (current_line_number, starting_line_number) in current_source.line_map {        state.original_line_map[starting_line_number] = Ok(LineOrigin {            commit_id: current_commit_id.clone(),            line_number: current_line_number,        });    }     Ok(())} /// For two files, calls `copy(current_start, parent_start, count)` for each/// range of contiguous lines in common (e.g. line 8-10 maps to line 9-11.)fn copy_same_lines_with(    current_contents: &[u8],    parent_contents: &[u8],    mut copy: impl FnMut(usize, usize, usize),) {    let diff = ContentDiff::by_line([current_contents, parent_contents]);    let mut current_line_counter: usize = 0;    let mut parent_line_counter: usize = 0;    for hunk in diff.hunks() {        match hunk.kind {            DiffHunkKind::Matching => {                let count = hunk.contents[0].split_inclusive(|b| *b == b'\n').count();                copy(current_line_counter, parent_line_counter, count);                current_line_counter += count;                parent_line_counter += count;            }            DiffHunkKind::Different => {                let current_output = hunk.contents[0];                let parent_output = hunk.contents[1];                current_line_counter += current_output.split_inclusive(|b| *b == b'\n').count();                parent_line_counter += parent_output.split_inclusive(|b| *b == b'\n').count();            }        }    }} async fn get_file_contents(    store: &Store,    path: &RepoPath,    tree: &MergedTree,) -> Result<BString, BackendError> {    let file_value = tree.path_value_async(path).await?;    let effective_file_value =        materialize_tree_value(store, path, file_value, tree.labels()).await?;    match effective_file_value {        MaterializedTreeValue::File(mut file) => Ok(file.read_all(path).await?.into()),        MaterializedTreeValue::FileConflict(file) => {            // TODO: track line origins without materializing            let options = ConflictMaterializeOptions {                marker_style: ConflictMarkerStyle::Diff,                marker_len: None,                merge: MergeOptions {                    hunk_level: FileMergeHunkLevel::Line,                    same_change: SameChange::Accept,                },            };            Ok(materialize_merge_result_to_bytes(                &file.contents,                &file.labels,                &options,            ))        }        _ => Ok(BString::default()),    }} #[cfg(test)]mod tests {    use super::*;     fn make_line_origin(commit_id: &CommitId, line_number: usize) -> LineOrigin {        LineOrigin {            commit_id: commit_id.clone(),            line_number,        }    }     #[test]    fn test_lines_iterator_empty() {        let annotation = FileAnnotation {            line_map: vec![],            text: "".into(),        };        assert_eq!(annotation.line_origins().collect_vec(), vec![]);        assert_eq!(annotation.lines().collect_vec(), vec![]);        assert_eq!(annotation.line_ranges().collect_vec(), vec![]);        assert_eq!(annotation.compact_line_ranges().collect_vec(), vec![]);    }     #[test]    fn test_lines_iterator_with_content() {        let commit_id1 = CommitId::from_hex("111111");        let commit_id2 = CommitId::from_hex("222222");        let commit_id3 = CommitId::from_hex("333333");        let annotation = FileAnnotation {            line_map: vec![                Ok(make_line_origin(&commit_id1, 0)),                Ok(make_line_origin(&commit_id2, 1)),                Ok(make_line_origin(&commit_id3, 2)),

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