晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# Introductions

Is for showing introductions to a user, on Yoast admin pages.
Based on plugin version, page, user capabilities and whether the user has seen it already.

- `Introduction_Interface` defines what data is needed
    - `id` as unique identifier
    - `plugin` and `version` to determine if the introduction is new (version > plugin version)
    - `pages` to be able to only show on certain Yoast admin pages
    - `capabilities` to be able to only show for certain users
- `Introductions_Collector` uses that data to determine whether an introduction should be "shown" to a user
    - uses the `wpseo_introductions` filter to be extendable from our other plugins
    - uses `Introductions_Seen_Repository` to get the data to determine if the user saw an introduction already
- `Introductions_Seen_Repository` is the doorway whether a user has seen an introduction or not
    - uses the `_yoast_introductions` user metadata
- `Introduction_Bucket` and `Introduction_Item` are used by the collector to get an array
- `Introductions_Integration` runs on the Yoast Admin pages and loads the assets
    - only loads on our Yoast admin pages, but never on our installation success pages as to not disturb onboarding
    - only loads assets if there is an introduction to show
        - `js/src/introductions` holds the JS
        - `wpseoIntroductions` is the localized script to transfer data from PHP to JS
        - `css/src/ai-generator.css` holds the CSS

Inside JS, register the modal content via `window.YoastSEO._registerIntroductionComponent`, which takes a
`id` and a `Component`. The id needs to be the same as the id in the `Introduction_Interface`.
The action `yoast.introductions.ready` can be used to know whether the registration function is available and ready for
use.

haha - 2025