Read a recipe

Read one Wikibooks Cookbook page: ingredients, equipment, steps, yield, time, difficulty, category, and the nutrition panel when the page carries one. 'id' is the page key from search_recipes or list_recipes, such as 'Cookbook:Spaghetti_alla_Carbonara'. A plain dish name is accepted and the Cookbook namespace is added. Pass 'servings' to rescale: a countable thing lands on the smallest share a cook can take out of one of it, which is a whole one where half of one cannot be measured out at all, such as an egg or a whole clove, a half where half of one pours, weighs or splits, such as a can or a packet, and a quarter where a knife or the size of the thing goes further, such as an onion, a slice of bread or a jar; a measurement is moved to a smaller unit before rounding so nothing disappears; and anything that cannot be multiplied is flagged instead. Read 'scaling' on each ingredient rather than doing the arithmetic yourself. A page that groups its ingredients by what they are for, such as a cake and its glaze, states that group on every line; a page that lists them flat states null. Two lines can read alike and belong to different parts of the dish. A page offering several versions of the dish states which one each line came from in 'variant'. Those lists replace one another: one of them is used, even where the procedure says to mix all the ingredients. A measurement the page writes as a conversion template is read as the value and the unit the page wrote, and the counterpart the template computes is left out: nothing here is converted between measuring systems. A line asking for as much as is needed and giving an indication in brackets, such as 'water as required (about 1 ½ cups)', states a quantity: the indication is scaled with the recipe and the wording in front of it is left as the page wrote it. A line offering an alternative in brackets, such as '4 eggs (or 8 egg yolks)', has both branches scaled, since a cook takes one of them. The Cookbook keeps recipes and the book's own chapter indexes in one namespace, and both write 'Ingredients' over a bulleted list. A page carrying no recipe box, no recipe banner and no procedure comes back with empty lists and a note: its bullets are links to other pages rather than things to buy. A heading owns what is nested under it and stops at the next heading of its own level, so a page carrying two recipes returns the first of each part and names the rest in a note. A page that only redirects elsewhere is followed to the page it points at, and 'id' and 'redirected_from' say which page was read. Rescaling needs a yield to scale from. A page that states none comes back as published, and says so. A page yielding no quantities is answered with 'factor' 1 and a note: an empty ingredient list was multiplied by nothing. 'author' and 'rating' are always null: the Cookbook is written collectively and carries no reader score. A time the page does not state is null, never zero, and never inferred from the steps. A page stating phases rather than a total, such as a fermentation and a cooking, publishes them in 'time_phases' with 'total_minutes' null: the phases measure different things and are never added. Pages are published under a licence that requires attribution; 'license' and 'url' carry what to credit.