Add ingredient scaling

examples/example-schedule.csv

@@ -114,13 +114,13 @@
 "2022-04-23","sabato",,
 "2022-04-24","domenica","https://ricette.giallozafferano.it/Torta-Pasqualina.html",
 "2022-04-25","lunedì",,
-"2022-04-26","martedì",,
+"2022-04-26","martedì",,"https://ricette.giallozafferano.it/Fusilli-con-crema-di-piselli-e-pecorino.html"
 "2022-04-27","mercoledì",,"https://ricette.giallozafferano.it/Orata-al-forno.html"
 "2022-04-28","giovedì",,
 "2022-04-29","venerdì",,"https://ricette.giallozafferano.it/Cordon-bleu-di-melanzane.html"
 "2022-04-30","sabato",,"https://ricette.giallozafferano.it/Hamburger-di-ceci.html"
 "2022-05-01","domenica",,
-"2022-05-02","lunedì",,
+"2022-05-02","lunedì",,"https://ricette.giallozafferano.it/Pasta-panna-e-asparagi.html"
 "2022-05-03","martedì",,
 "2022-05-04","mercoledì",,
 "2022-05-05","giovedì",,"https://ricette.giallozafferano.it/Scaloppine-saporite-con-cotto-e-formaggio.html"
@@ -132,7 +132,7 @@
 "2022-05-11","mercoledì",,"https://ricette.giallozafferano.it/Mezze-maniche-al-tonno.html"
 "2022-05-12","giovedì",,
 "2022-05-13","venerdì",,"https://ricette.giallozafferano.it/Spiedini-di-pollo.html"
-"2022-05-14","sabato",,
+"2022-05-14","sabato",,"https://ricette.giallozafferano.it/Fusilli-con-crema-di-piselli-e-pecorino.html"
 "2022-05-15","domenica",,
 "2022-05-16","lunedì",,
 "2022-05-17","martedì",,
@@ -169,15 +169,15 @@
 "2022-06-17","venerdì",,"https://ricette.giallozafferano.it/Salmorejo.html"
 "2022-06-18","sabato","https://ricette.giallozafferano.it/Insalata-di-ceci-estiva.html",
 "2022-06-19","domenica",,
-"2022-06-20","lunedì",,
+"2022-06-20","lunedì",,"https://ricette.giallozafferano.it/Fusilli-con-crema-di-piselli-e-pecorino.html"
 "2022-06-21","martedì",,
-"2022-06-22","mercoledì",,"https://ricette.giallozafferano.it/Pasta-fredda-con-pesto-senz-aglio.html"
-"2022-06-23","giovedì",,
-"2022-06-24","venerdì",,
+"2022-06-22","mercoledì",,
+"2022-06-23","giovedì",,"https://ricette.giallozafferano.it/Riso-saltato-con-tonno.html"
+"2022-06-24","venerdì",,"https://ricette.giallozafferano.it/Pasta-fredda-con-pesto-senz-aglio.html"
 "2022-06-25","sabato","https://ricette.giallozafferano.it/Orata-al-forno.html",
 "2022-06-26","domenica",,
 "2022-06-27","lunedì",,"https://ricette.giallozafferano.it/Spaghetti-poveri.html"
-"2022-06-28","martedì",,
+"2022-06-28","martedì",,"https://ricette.giallozafferano.it/Insalata-di-orzo-con-pesto-di-rucola-fagiolini-e-zucchine.html"
 "2022-06-29","mercoledì",,"https://ricette.giallozafferano.it/Insalata-Shirazi.html"
 "2022-06-30","giovedì",,"https://ricette.giallozafferano.it/Scaloppine-saporite-con-cotto-e-formaggio.html"
 "2022-07-01","venerdì",,
@@ -201,13 +201,13 @@
 "2022-07-19","martedì",,"https://ricette.giallozafferano.it/Verdure-gratinate-al-forno.html"
 "2022-07-20","mercoledì",,
 "2022-07-21","giovedì",,"https://ricette.giallozafferano.it/Insalata-di-pasta-Mediterranea.html"
-"2022-07-22","venerdì",,
+"2022-07-22","venerdì",,"https://ricette.giallozafferano.it/Riso-saltato-con-tonno.html"
 "2022-07-23","sabato",,"https://ricette.giallozafferano.it/Cocotte-di-quinoa.html"
 "2022-07-24","domenica",,
 "2022-07-25","lunedì",,"https://ricette.giallozafferano.it/Tempeh-alle-verdure.html"
 "2022-07-26","martedì",,"https://ricette.giallozafferano.it/Spiedini-di-pollo.html"
 "2022-07-27","mercoledì",,"https://ricette.giallozafferano.it/Pasta-con-crema-di-peperoni.html"
-"2022-07-28","giovedì",,
+"2022-07-28","giovedì",,"https://ricette.giallozafferano.it/Insalata-di-orzo-con-pesto-di-rucola-fagiolini-e-zucchine.html"
 "2022-07-29","venerdì",,"https://ricette.giallozafferano.it/Orata-al-forno.html"
 "2022-07-30","sabato",,
 "2022-07-31","domenica",,
@@ -231,22 +231,22 @@
 "2022-08-18","giovedì",,"https://ricette.giallozafferano.it/Spaghetti-poveri.html"
 "2022-08-19","venerdì",,"https://ricette.giallozafferano.it/Bocconcini-di-pollo-con-yogurt-e-curcuma.html"
 "2022-08-20","sabato",,"https://ricette.giallozafferano.it/Salmorejo.html"
-"2022-08-21","domenica",,
+"2022-08-21","domenica","https://ricette.giallozafferano.it/Scaloppine-in-rosa.html",
 "2022-08-22","lunedì",,"https://ricette.giallozafferano.it/Insalata-di-quinoa-alla-greca.html"
-"2022-08-23","martedì",,
+"2022-08-23","martedì",,"https://ricette.giallozafferano.it/Omelette-caprese.html"
 "2022-08-24","mercoledì",,"https://ricette.giallozafferano.it/Pasta-fredda-con-pesto-senz-aglio.html"
-"2022-08-25","giovedì",,
-"2022-08-26","venerdì",,"https://ricette.giallozafferano.it/Spiedini-di-pollo.html"
-"2022-08-27","sabato","https://ricette.giallozafferano.it/Orata-al-forno.html",
+"2022-08-25","giovedì",,"https://ricette.giallozafferano.it/Braciole-in-salsa-all-arancia.html"
+"2022-08-26","venerdì",,"https://ricette.giallozafferano.it/Pasta-ricotta-e-noci.html"
+"2022-08-27","sabato","https://ricette.giallozafferano.it/Orata-al-forno.html","https://ricette.giallozafferano.it/Spiedini-di-pollo.html"
 "2022-08-28","domenica",,
-"2022-08-29","lunedì",,
+"2022-08-29","lunedì",,"https://ricette.giallozafferano.it/Riso-saltato-con-tonno.html"
 "2022-08-30","martedì",,"https://ricette.giallozafferano.it/Scaloppine-saporite-con-cotto-e-formaggio.html"
 "2022-08-31","mercoledì",,"https://ricette.giallozafferano.it/Tempeh-alle-verdure.html"
-"2022-09-01","giovedì",,
+"2022-09-01","giovedì",,"https://ricette.giallozafferano.it/Insalata-di-orzo-con-pesto-di-rucola-fagiolini-e-zucchine.html"
 "2022-09-02","venerdì",,"https://ricette.giallozafferano.it/Petto-di-pollo-ai-peperoni.html"
 "2022-09-03","sabato",,
 "2022-09-04","domenica",,
-"2022-09-05","lunedì",,
+"2022-09-05","lunedì",,"https://ricette.giallozafferano.it/Pasta-ricotta-e-noci.html"
 "2022-09-06","martedì",,
 "2022-09-07","mercoledì",,
 "2022-09-08","giovedì",,"https://ricette.giallozafferano.it/Pasta-con-le-melanzane.html"
@@ -287,7 +287,7 @@
 "2022-10-13","giovedì",,"https://ricette.giallozafferano.it/Maccheroncini-al-fume.html"
 "2022-10-14","venerdì",,"https://ricette.giallozafferano.it/Polpette-al-sugo.html"
 "2022-10-15","sabato",,"https://ricette.giallozafferano.it/Ratatouille.html"
-"2022-10-16","domenica",,
+"2022-10-16","domenica",,"https://ricette.giallozafferano.it/Pasta-ricotta-e-noci.html"
 "2022-10-17","lunedì",,
 "2022-10-18","martedì",,
 "2022-10-19","mercoledì",,"https://ricette.giallozafferano.it/Scaloppine-ai-funghi.html"
@@ -317,7 +317,7 @@
 "2022-11-12","sabato",,"https://ricette.giallozafferano.it/Chili-con-carne.html"
 "2022-11-13","domenica",,
 "2022-11-14","lunedì",,
-"2022-11-15","martedì",,
+"2022-11-15","martedì",,"https://ricette.giallozafferano.it/Lenticchie-e-salsiccia.html"
 "2022-11-16","mercoledì",,
 "2022-11-17","giovedì",,
 "2022-11-18","venerdì",,"https://ricette.giallozafferano.it/Torta-rustica.html"
@@ -354,7 +354,7 @@
 "2022-12-19","lunedì",,
 "2022-12-20","martedì",,
 "2022-12-21","mercoledì",,
-"2022-12-22","giovedì",,
+"2022-12-22","giovedì",,"https://ricette.giallozafferano.it/Lenticchie-e-salsiccia.html"
 "2022-12-23","venerdì",,
 "2022-12-24","sabato",,
 "2022-12-25","domenica","https://ricette.giallozafferano.it/Filetto-in-crosta.html",

src/commands/groceries.rs

@@ -34,7 +34,9 @@ pub async fn with(
     };
 
     let ids = map_events_to_recipe_ids(api_client, calendar_name, &date_range).await?;
-    let ingredients = get_ingredients(api_client, ids).await?;
+
+    // TODO: make required_yield configurable!
+    let ingredients = get_ingredients(api_client, ids, 4.0).await?;
     let ingredients = merge_ingredients(ingredients);
     let md = prepare_grocery_list(&date_range, &ingredients)?;
     log::debug!("Saving the following grocery list:\n\n{}", &md);
@@ -68,6 +70,7 @@ where
 async fn get_ingredients<RecipeIds>(
     api_client: &ApiClient,
     recipe_ids: RecipeIds,
+    required_yield: f64,
 ) -> Result<Vec<(Ingredient, String)>>
 where
     RecipeIds: IntoIterator<Item = usize>,
@@ -88,9 +91,10 @@ where
         response.json::<Recipe>().await.map(|r| {
             log::info!("Retrieved ingredients for '{}'", r.name);
             let recipe_name = r.name.clone();
+            let scale = required_yield / r.recipe_yield as f64;
             r.ingredients
                 .into_iter()
-                .map(move |i| (i, recipe_name.clone()))
+                .map(move |i| (i * scale, recipe_name.clone()))
         })
     });
 

src/recipe.rs

@@ -283,6 +283,15 @@ impl core::fmt::Display for Ingredient {
     }
 }
 
+impl std::ops::Mul<f64> for Ingredient {
+    type Output = Ingredient;
+
+    fn mul(mut self, rhs: f64) -> Self::Output {
+        self.amount *= rhs;
+        self
+    }
+}
+
 impl core::fmt::Display for Unit {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let u: &dyn core::fmt::Display = match self {