Fix DiffParser dropping/misattributing non-ASCII and space-containing file paths - #1056
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Fix DiffParser dropping/misattributing non-ASCII and space-containing file paths#1056DevPatils wants to merge 3 commits into
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…CII and quoted filenames
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September 6, 2026 06:25
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Walkthrough
ChangesDiffParser path handling
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The diff parser now preserves quoted non-ASCII and space-containing paths while avoiding header/content confusion. No current merge-blocking risk is established. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Inline comments:
In `@application/utils/harvester/diff_parser.py`:
- Line 18: Update the quoted-body decoding in the relevant diff parser flow to
encode quoted_body as UTF-8 before decoding C escapes, preserving non-ASCII
characters when core.quotePath=false. Add a regression test covering a filename
such as café".md and verify the parsed result retains the original UTF-8 text.
In `@repro_diff_parser_bug.py`:
- Line 59: Remove the unused f-string prefixes from the two diagnostic print
literals in repro_diff_parser_bug.py at lines 59-59 and 79-79, converting both
to normal strings without changing their text or output.
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application/tests/harvester_test/diff_parser_test.pyapplication/utils/harvester/diff_parser.pyrepro_diff_parser_bug.py
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Summary
Fixes #1032 —
DiffParser.parse()silently discarded diffs for files withnon-ASCII names, and truncated paths containing
" b/", mis-attributingthose changes to a nonexistent file.
Both stemmed from a single regex on the combined header line:
match = re.match(r"diff --git a/(.+?) b/", line)What was wrong
Bug A — silent data loss. Git C-quotes any path containing non-ASCII
characters (
core.quotePathis on by default), so the header forcafé.mdis
diff --git "a/caf\303\251.md" "b/caf\303\251.md". It starts with"a/,not a literal
a/, so the regex simply didn't match —current_filestayedNoneand the file's entire diff was dropped with no error, warning, orlog entry.
Bug B — silent path corruption. The non-greedy
(.+?)stopped at thefirst
" b/"substring in the line, which is ambiguous whenever the realpath contains that sequence. A file at
foo b/bar.mdproduced the headerdiff --git a/foo b/bar.md b/foo b/bar.md, and the parser reported the pathas just
'foo'.Bug C — surfaced by fixing A. A quoted
+++ "b/caf\303\251.md"linestarts with
+, so once headers parsed correctly it would have beencaptured as added file content. This one never fired before only because
Bug A meant those diffs never got that far.
The fix
Replaces the regex with explicit header parsing that:
"caf\303\251.md"→café.md) byundoing the octal byte escapes.
a/<path> b/<path>symmetry to pin down the path lengthunambiguously instead of guessing which
" b/"is the separator — outsideof renames both sides name the same path, so the header is exactly
2 * len(path) + 5characters.--- a//+++ b/headers when present,since those carry one path each and are unambiguous. Falls back to the
b-side for renames (added lines belong to the rename target).
---/+++as headers before the first hunk, so+++ xinside a hunk is still correctly kept as the added line
++ x.The
--- a//+++ b/lines are preferred but not required — the existingtests use headerless diffs (
test_multiple_files), and those still passunchanged via the header path.
Verification
Reproduced against real
git diffoutput from actual throwaway gitrepositories (not synthetic diff text), before and after:
café.mdfile_path='café.md',added_lines=['added line']foo b/bar.mdfile_path='foo'file_path='foo b/bar.md'" b/", quoted headers not leaking into content, in-hunk+++lines staying content, renames using the new path
Windows-specific path failures remain (
repository_cache_test,git_repository_client_test) — confirmed unrelated by re-runningthem with this change stashed, where they fail identically
black --checkpasses on both modified files