{"id": "plugin_hooks:id1", "page": "plugin_hooks", "ref": "id1", "title": "Plugin hooks", "content": "Datasette  plugins  use  plugin hooks  to customize Datasette's behavior. These hooks are powered by the  pluggy  plugin system. \n         Each plugin can implement one or more hooks using the  @hookimpl  decorator against a function named that matches one of the hooks documented on this page. \n         When you implement a plugin hook you can accept any or all of the parameters that are documented as being passed to that hook. \n         For example, you can implement the  render_cell  plugin hook like this even though the full documented hook signature is  render_cell(row, value, column, table, database, datasette) : \n         @hookimpl\ndef render_cell(value, column):\n    if column == \"stars\":\n        return \"*\" * int(value) \n         \n             List of plugin hooks \n             \n                 \n                     prepare_connection(conn, database, datasette) \n                 \n                 \n                     prepare_jinja2_environment(env, datasette) \n                 \n                 \n                     Page extras \n                     \n                         \n                             extra_template_vars(template, database, table, columns, view_name, request, datasette) \n                         \n                         \n                             extra_css_urls(template, database, table, columns, view_name, request, datasette) \n                         \n                         \n                             extra_js_urls(template, database, table, columns, view_name, request, datasette) \n                         \n                         \n                             extra_body_script(template, database, table, columns, view_name, request, datasette) \n                         \n                     \n                 \n                 \n                     publish_subcommand(publish) \n                 \n                 \n                     render_cell(row, value, column, table, database, datasette, request) \n                 \n                 \n                     register_output_renderer(datasette) \n                 \n                 \n                     register_routes(datasette) \n                 \n                 \n                     register_commands(cli) \n                 \n                 \n                     register_facet_classes() \n                 \n                 \n                     register_permissions(datasette) \n                 \n                 \n                     asgi_wrapper(datasette) \n                 \n                 \n                     startup(datasette) \n                 \n                 \n                     canned_queries(datasette, database, actor) \n                 \n                 \n                     actor_from_request(datasette, request) \n                 \n                 \n                     actors_from_ids(datasette, actor_ids) \n                 \n                 \n                     jinja2_environment_from_request(datasette, request, env) \n                 \n                 \n                     filters_from_request(request, database, table, datasette) \n                 \n                 \n                     permission_allowed(datasette, actor, action, resource) \n                 \n                 \n                     register_magic_parameters(datasette) \n                 \n                 \n                     forbidden(datasette, request, message) \n                 \n                 \n                     handle_exception(datasette, request, exception) \n                 \n                 \n                     skip_csrf(datasette, scope) \n                 \n                 \n                     get_metadata(datasette, key, database, table) \n                 \n                 \n                     menu_links(datasette, actor, request) \n                 \n                 \n                     Action hooks \n                     \n                         \n                             table_actions(datasette, actor, database, table, request) \n                         \n                         \n                             view_actions(datasette, actor, database, view, request) \n                         \n                         \n                             query_actions(datasette, actor, database, query_name, request, sql, params) \n                         \n                         \n                             row_actions(datasette, actor, request, database, table, row) \n                         \n                         \n                             database_actions(datasette, actor, database, request) \n                         \n                         \n                             homepage_actions(datasette, actor, request) \n                         \n                     \n                 \n                 \n                     Template slots \n                     \n                         \n                             top_homepage(datasette, request) \n                         \n                         \n                             top_database(datasette, request, database) \n                         \n                         \n                             top_table(datasette, request, database, table) \n                         \n                         \n                             top_row(datasette, request, database, table, row) \n                         \n                         \n                             top_query(datasette, request, database, sql) \n                         \n                         \n                             top_canned_query(datasette, request, database, query_name) \n                         \n                     \n                 \n                 \n                     Event tracking \n                     \n                         \n                             track_event(datasette, event) \n                         \n                         \n                             register_events(datasette)", "breadcrumbs": "[]", "references": "[{\"href\": \"https://pluggy.readthedocs.io/\", \"label\": \"pluggy\"}]"}