chore: Structured diff chunks: parse a unified diff into typed per-file hunks with both-side line numbers by getappz · Pull Request #942 · getappz/agentflare

getappz · 2026-10-21T07:06:26Z

review::changed_lines collapsed a unified diff to the new-side line numbers it touches — enough to verify a finding against a diff, not enough to show one, anchor a comment on it, or render it side by side.

This adds src/review/diff.rs, which keeps the whole shape: files → hunks → typed lines, with the old and the new line number of every line kept side by side. A deleted line has an old number and no new one, an added line the reverse, and a deletion paired with the addition that replaced it becomes one Changed line carrying both texts — which is what makes a side-by-side view possible.

review::changed_lines now reads through the parser, so the line set and the structured view of the same diff cannot drift. Its output is unchanged for every existing fixture.

The parser is also more careful than the scanner it replaces: a line inside a hunk whose text starts with -- or ++ looks exactly like a file header and is no longer mistaken for one, and a malformed hunk header loses its numbers rather than the lines that follow it.

Ported from baz-cli's parsePatch (.refs/baz-cli/src/lib/clients/github.ts:819) — see item #384 for the slice this belongs to.

Opened by opencode on i-flare-51bb8de6c33b (flared:51bb8de6c33b) for item #386 via agentflare.

Test plan

mbx test --bin agentflare            # 2774 passed, 0 failed, 10 ignored
mbx clippy --all-targets             # no warnings in the touched files
cargo fmt --all -- --check           # clean

Notes for reviewers

Risk areas

review::changed_lines is the one existing caller, and it is used to decide whether a review finding is verified. Its output is unchanged for every existing fixture, but it is now derived from a different parser, so it is the place to look first.
src/review/diff.rs is new and self-contained; nothing else in the tree depends on it yet (item fix(item): clean up the worktree on a plain release, not just done/check_merge #388 consumes the chunk accessors).

Edge cases covered by tests

a -/+ pair becomes one Changed line carrying both texts; uneven runs leave the extras one-sided
a line inside a hunk whose text starts with -- or ++ looks exactly like a file header and is not mistaken for one
a hunk whose @@ header does not parse keeps its lines but claims no line numbers, so it cannot verify a finding that points at a line the file does not have
\ No newline at end of file is a marker, not a line
a renamed file keeps both paths; a deleted file has no new path
a file with several hunks keeps all of them

Backwards compatibility

review::changed_lines keeps its signature and its output.
No new dependencies; no schema or state-machine change.

Summary by CodeRabbit

Bug Fixes
- Improved review change detection across files with multiple hunks.
- More accurately identifies added, deleted, modified, and unchanged lines.
- Better handles renamed files, deleted files, malformed diff headers, and no-newline markers.
- Prevents deleted lines from being reported as newly changed lines.
Tests
- Expanded coverage for complex unified diffs, including adjacent additions and deletions, multiple files, and multiple hunks.

…de line numbers review::changed_lines collapsed a diff to the new-side line numbers it touches — enough to verify a finding against a diff, not enough to show one, anchor a comment on it, or render it side by side. src/review/diff.rs keeps the whole shape instead: files → hunks → typed lines, with the old and the new line number of every line kept side by side. A deleted line has an old number and no new one, an added line the reverse, and a deletion paired with the addition that replaced it becomes one Changed line carrying both texts — which is what makes a side-by-side view possible. review::changed_lines now reads through the parser, so the line set and the structured view of the same diff cannot drift. Its output is unchanged for every existing fixture. The parser is also more careful than the scanner it replaces: a line inside a hunk whose text starts with "-- " or "++ " looks exactly like a file header and is no longer mistaken for one, and a malformed hunk header loses its numbers rather than the lines that follow it. Ported from baz-cli's parsePatch (.refs/baz-cli/src/lib/clients/github.ts:819). Agentflare-Agent: opencode Agentflare-Branch: task/386-structured-diff-chunks-parse-a-unified-d Agentflare-Item: 386

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📝 Walkthrough

The change adds a public unified-diff parser with structured file, hunk, and line data. The changed_lines function now uses the parser to collect new-side line numbers across hunks.

Changes: Structured Diff Parsing

Layer / File(s)	Summary
Diff model and parser `src/review/diff.rs`	Adds public types for files, hunks, and typed lines. Parses paths, hunks, metadata, line pairs, and edge cases. Adds parser coverage for multiple diff forms.
Changed-line integration `src/review.rs`	Exposes the `diff` module and updates `changed_lines` to collect new-side line numbers across all hunks. Adds a multiple-hunk test.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant changed_lines
  participant parse_unified_diff
  participant FileDiff
  changed_lines->>parse_unified_diff: parse unified diff
  parse_unified_diff->>FileDiff: produce files and hunks
  changed_lines->>FileDiff: select new-side file key and line numbers

Merge Risk: 🔵 Low · up to 44ee1

Malformed diffs can cause incorrect line verification. This remains a bounded risk to address or explicitly accept before merging.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 74.36% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 39 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: parsing unified diffs into typed per-file hunks with old- and new-side line numbers. It is specific and related to the changeset.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
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Inline comments:
Review comments at @src/review/diff.rs:
- Around line 276-287: Update ChunkState::new and the hunk lifecycle to preserve
whether the header parsed instead of treating a missing header as numbered
zero-based data. When the header is None, ensure entries produced by push have
both old_line and new_line set to None before they reach changed_lines or
pair_up, while preserving structured entries and existing numbering for valid
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Agentflare-Agent: opencode Agentflare-Branch: task/386-structured-diff-chunks-parse-a-unified-d Agentflare-Item: 386

A hunk whose `@@` header does not parse used to number its lines from zero. Those numbers reached `review::changed_lines`, so a finding citing line 1 of such a hunk was marked verified — against a line the file does not have. The structured view kept the lines, which is right; the numbers they were given were not. Lines of a hunk with no readable header now carry no line number at all, and so count toward nothing. Verified against the diff: a finding pointing into that hunk is unverified, as it should be. Found by CodeRabbit on PR #942. Agentflare-Agent: opencode Agentflare-Branch: task/386-structured-diff-chunks-parse-a-unified-d Agentflare-Item: 386

getappz · 2026-10-21T08:58:00Z

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getappz added agentflare:in-review beacon:i-flare-51bb8de6c33b labels Oct 21, 2026

getappz marked this pull request as ready for review October 21, 2026 07:06

Merge branch 'master' into task/386-structured-diff-chunks-parse-a-un…

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getappz added 2 commits October 21, 2026 12:59

test(review): cover a multi-file diff in the structured parser

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Agentflare-Agent: opencode Agentflare-Branch: task/386-structured-diff-chunks-parse-a-unified-d Agentflare-Item: 386

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getappz merged commit 9352f59 into master Oct 22, 2026
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getappz deleted the task/386-structured-diff-chunks-parse-a-unified-d branch October 22, 2026 11:52

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This was referenced Oct 24, 2026

chore: Commit-pinned file diffs: fetch a PR's files+patch as of a given commit, not as of the PR head #955

Merged

chore: Anchored diff rendering: side-by-side window around a comment's line, selection highlighted #962

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chore: Structured diff chunks: parse a unified diff into typed per-file hunks with both-side line numbers - #942

chore: Structured diff chunks: parse a unified diff into typed per-file hunks with both-side line numbers#942
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