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shelfmark/docs/dev/index.md
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splitsec2 e273e7b0ed docs(dev): bring the plugin guides in line with the current code (#1566)
This is the biggest of the docs batch, and this time I don't think it
was my PRs that caused it. The plugin guides fell behind as the plugin
API changed over several releases, and nobody updated them along the
way.

Same arrangement as the others: Claude compared the guides to the code
and wrote the changes, so another human look before this merges would be
good. Someone who knows the plugin API well would catch things I would
not. These are the parts I would read first: the search plan table, the
`SourceUnavailableError` advice in the error handling section, and the
`locating` status row.

What was wrong and is now fixed, all checked against the code:

Release sources guide
- `search` takes `(book, plan, *, expand_search, content_type)`. Every
sample had the old one-argument signature, so a source written from the
guide raised a TypeError on its first search. There is now a short table
of the search plan fields.
- A source is registered by adding its module to
`_BUILTIN_SOURCE_MODULES`. The guide said to add an import at the bottom
of `__init__.py`.
- `get_column_config` is an instance method, not a classmethod, and
`ColumnRenderType.SEEDERS` does not exist (the real members are listed).
- `download` can return a `HandoffResult`. `list_available_sources`
lists every source with an `enabled` flag, it does not filter.
- `group="sources"` is gone, since only `direct_download` and
`metadata_providers` exist.
- Field lists for `Release`, `DownloadTask`, `BookMetadata`,
`ColumnSchema` and `ReleaseColumnConfig` are brought up to date, with
the protocol enum and the `locating` status.
- The optional hooks that were not mentioned (`post_process_cleanup`,
`build_retry_resolution_fields`, `list_authors`, `seed_complaints`,
`get_record`, `get_destination_override`, `search_results_are_releases`)
are documented.

Plugin settings guide
- The examples imported from `shelfmark.metadata_providers.base` and
`shelfmark.release_sources.base`, which do not exist. The metadata
example also skipped the abstract `search_by_isbn` and the kwargs
factory.
- Value priority now starts with the environment variable, and
`search_mode` is listed next to `general` as using `settings.json`. The
`metadata_providers` group order is 12, not 50.
- Documented `TagListField`, `OrderableListField`, `TableField`,
`env_var`, `env_supported`, `user_overridable`, `universal_only`,
`filter_by_field`, `register_on_save` and the `current_values` argument
for action callbacks.

Also in here: `docs/dev/index.md` was a TODO stub and is now a short
index linked from `docs/index.md`, a dead link in the metadata providers
README is fixed, and the README table gains Databáze knih and Moly.hu.

To check the samples were not just plausible, I ran the quick start and
the full BookNet example against the real registry. Both register,
instantiate and return their column config. The old BookNet example
failed on import with a NameError, because the Test Connection callback
was defined below the settings function that references it. The
decorator calls that function straight away, so both settings snippets
now define the callback first.
2026-10-23 22:02:18 -06:00

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Markdown

# Developer Documentation
Guides for adding to Shelfmark.
- [Release Sources Plugin Guide](release-sources-plugin-guide.md): add a source that searches for releases and a handler that downloads them
- [Plugin Settings Guide](plugin-settings.md): add settings tabs and fields for a plugin to the Settings UI
- [Metadata Providers](../../shelfmark/metadata_providers/README.md): add a metadata provider