Fixes#1138Fixes#1141
## Problem
Two language editions of one book resolve to the same canonical title,
so they render to the same path and the second gets a `_1` collision
suffix. Audiobookshelf treats a folder as exactly one library item, so
the pair becomes a single book with both files as tracks and a summed
runtime.
Shelfmark already parses and displays the language. It just never
reached the template engine.
## `{Language}` template variable
A template like `{Author}/{Title}{ (Language)}/{Author} - {Title}` now
yields:
```
/library/J K Rowling/Harry Potter (sv)/J K Rowling - Harry Potter.m4b
/library/J K Rowling/Harry Potter/J K Rowling - Harry Potter.m4b
```
The untagged edition's path is byte-identical to today, so no existing
layout shifts.
Three details worth flagging:
**The value is casefolded.** On a case-insensitive filesystem `(SV)` and
`(sv)` would collapse back into one folder, reintroducing the exact
collision being fixed.
**Values meaning "we don't know" render nothing** rather than producing
`Project Hail Mary (unknown)` folders. Anna's Archive reports that
string literally (`direct_download.py`, `language = detected or
"unknown"`).
**The frontend wasn't sending the release language at all**, so the
token would have stayed empty for exactly the audiobook sources in the
report. Prowlarr and AudiobookBay do not put language in `extra` the way
`direct_download` does, hence the payload plumbing. It reads
`release.language`, never `book.language` — the latter is the provider's
canonical edition and would mislabel a translation, with a regression
test for that specifically.
Not gated to audiobooks: Calibre-Web-Automated stages ingested files by
basename and discards folder structure, so the rename (filename)
template is the only lever those users have. Verified that form works:
`J K Rowling - Harry Potter (sv).epub`.
## Language consolidation (#1141)
Three release sources each carried their own alias map, all resolving to
the same ISO 639-1 codes, alongside a bundled database that only one of
them used. Adding a language meant editing three places.
Aliases now live in `data/book-languages.json` beside the code and name
they belong to, and `shelfmark/core/languages.py` resolves any of them —
two-letter code, ISO 639-2 three-letter in either the bibliographic or
terminological form, or English name. Prowlarr and AudiobookBay drop
their tables. Direct Download keeps its own path-parsing heuristics,
including the ambiguous short codes that collide with English words
(`de`, `en`, `no`, `in`), and takes only the alias data.
This also closes a coverage gap. MyAnonamouse offers 62 languages;
Prowlarr mapped 37, and an unmapped code is *dropped* rather than passed
through, so the other 25 carried no language at all — leaving
`{Language}` empty and the collision unfixed for Latin, Farsi, Tamil,
Urdu and the rest. Seven languages MAM offers had no database entry at
all: Bosnian, Burmese, Estonian, Icelandic, Manx, Scottish Gaelic,
Sanskrit.
Also fixes the Traditional Chinese code, which used a U+2011
non-breaking hyphen. Nothing compares against the ASCII spelling today
so it was latent, but it would silently defeat the first thing that did.
## Validation
Verified end to end against a live Prowlarr and MyAnonamouse, not just
unit tests. A real search returning both an English and a Swedish
edition, through the actual `queue_release` → `DownloadTask` → naming
path:
```
STEP 1 real MAM search -> 37 releases, languages: ['en', 'sv']
STEP 3 queue_release -> task.language='sv'
STEP 4 build_metadata_dict -> metadata['Language']='sv'
STEP 5 build_library_path -> /library/J K Rowling/Harry Potter (sv)/...
two language editions resolve to DIFFERENT folders: True
```
The refactor is pinned by a snapshot of both per-source maps taken
*before* they were deleted. All 131 aliases are asserted to still
resolve to the same code, one parametrised test each, so a regression
names the specific alias.
Also verified: the filename-only template, the retry round-trip
(`serialize_task_for_retry` → `_restore_task_from_retry_payload`, plus a
legacy payload with no `language` key), and placeholder handling.
Added a `KNOWN_TOKENS` ordering invariant test — `find_placeholder()`
does a substring `.find()` in list order and nothing protected that
contract, so a future token in the wrong position could silently shadow
an existing one. And a lockstep guard on the frontend, since
`KNOWN_TOKENS` is hand-duplicated in TypeScript.
**One caveat worth stating.** Three MAM codes are confirmed by
observation (`ENG`→`en`, `SWE`→`sv`, `MAL`→`ml`, the last from a real
`[MAL / EPUB]` Tagore release). The remaining ~59 are derived from ISO
639-2 rather than observed, because MAM's catalogue is overwhelmingly
English — enabling 27 extra languages still yielded only one non-English
hit across 258 results. Mitigated rather than closed: both 639-2
variants are present for every language where they differ, and a wrong
alias is an unused entry while a missing one loses the language. Happy
to correct any code a maintainer knows differs.
## Test results
2056 Python tests pass (up from 1906). Frontend typecheck, lint, format
and 126 unit tests pass.
Pre-existing failures on my machine, unchanged by this branch and
unrelated: `tests/bypass/` needs `seleniumbase`, and
`tests/config/test_entrypoint_permissions.py` uses bash-4 syntax that
macOS bash 3.2 rejects.
---------
Co-authored-by: delize <4028612+delize@users.noreply.github.com>
Co-authored-by: CaliBrain <calibrain@l4n.xyz>
