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fix: compare titles in every script when looking for duplicate books - #38
The library told me that 小学1年生 言葉と文法にぐーんと強くなる (くもんの国語集中学習) "appears more than once" and suggested merging. It doesn't: the other book is 小学1年生 漢字にぐーんと強くなる, a different Kumon workbook (kanji instead of grammar). Merging them would have moved one book's progress into the other.
The cause is norm in app/src/Book.jsx. It keeps only a-z0-9, so both Japanese titles shrink to 1, and with the same author ("Unknown Author") looksLikeSame takes them for one book. Any two Japanese, Chinese, Korean or other non-Latin titles that share a number can be flagged the same way.
The fix keeps letters and digits of every script (/[^\p{L}\p{N}]+/gu), after NFKC so full-width forms still compare equal to normal ones. The server's cover lookup already treats titles like that. The same check also sorts likely duplicates first in the merge dialog, so that gets the same fix.
Tests in Library.test.jsx: the two Kumon titles no longer produce the notice, and 変な家２ ～11の間取り図～ / 変な家2 11の間取り図 (a real duplicate written two ways) still does. Both fail without the change. The app suite passes (186 tests).
The duplicate check kept only a-z and 0-9, so two different Japanese titles
that share a number (e.g. two Kumon workbooks for 1st grade) both became "1"
and were offered for merging.
Book title and author normalization now applies Unicode NFKC and retains letters and digits from all scripts. Tests cover duplicate notices for distinct Japanese titles and full-width and half-width title variants.
Changes: Unicode duplicate matching
Layer / File(s)
Summary
Normalize comparison text and test duplicate notices app/src/Book.jsx, app/src/Library.test.jsx
norm now applies NFKC and retains Unicode letters and digits. Tests check that distinct Japanese titles do not trigger a duplicate notice and that full-width and half-width variants do.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @app/src/Book.jsx:
- Line 255: Update the norm function’s Unicode character filter to preserve
combining marks by allowing \p{M} alongside letters and numbers. Keep the
existing normalization, lowercasing, separator replacement, and trimming
behavior unchanged.
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app/src/Book.jsx
app/src/Library.test.jsx
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Dropping marks made Thai titles that differ only in a tone mark look
the same: ป่า (forest) and ป้า (aunt) both became "ป า". Hindi and
Arabic vowel signs had the same problem.
eszter007
changed the title
Compare titles in every script when looking for duplicate books
fix: compare titles in every script when looking for duplicate books
Oct 24, 2026
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eszter007
changed the title
The library told me that 小学1年生 言葉と文法にぐーんと強くなる (くもんの国語集中学習) "appears more than once" and suggested merging. It doesn't: the other book is 小学1年生 漢字にぐーんと強くなる, a different Kumon workbook (kanji instead of grammar). Merging them would have moved one book's progress into the other.
The cause is
norminapp/src/Book.jsx. It keeps onlya-z0-9, so both Japanese titles shrink to1, and with the same author ("Unknown Author")looksLikeSametakes them for one book. Any two Japanese, Chinese, Korean or other non-Latin titles that share a number can be flagged the same way.The fix keeps letters and digits of every script (
/[^\p{L}\p{N}]+/gu), after NFKC so full-width forms still compare equal to normal ones. The server's cover lookup already treats titles like that. The same check also sorts likely duplicates first in the merge dialog, so that gets the same fix.Tests in
Library.test.jsx: the two Kumon titles no longer produce the notice, and 変な家２ ～11の間取り図～ / 変な家211の間取り図(a real duplicate written two ways) still does. Both fail without the change. The app suite passes (186 tests).