Add rudimentary ingredient parsing and merging

This commit is contained in:
Matteo Settenvini 2022-08-12 16:30:37 +02:00
parent e69d8fc24c
commit 7025ee9e3a
Signed by: matteo
GPG Key ID: 8576CC1AD97D42DF
2 changed files with 191 additions and 11 deletions

View File

@ -85,15 +85,42 @@ where
Ok(ingredients.into_iter().flatten().collect())
}
fn merge_ingredients(mut ingredients: Vec<(Ingredient, String)>) -> Vec<(Ingredient, String)> {
ingredients.sort();
// TODO actual merging
ingredients
fn merge_ingredients(mut ingredients: Vec<(Ingredient, String)>) -> Vec<(Ingredient, Vec<String>)> {
if ingredients.is_empty() {
return vec![];
}
fn prepare_grocery_list(ingredients: &Vec<(Ingredient, String)>) -> Result<String> {
// Prime merged_ingredients with the first ingredient in sorted order.
ingredients.sort_by(|(a, _), (b, _)| {
a.name.cmp(&b.name).then_with(|| {
// inefficient, but not so bad for now
a.unit.to_string().cmp(&b.unit.to_string())
})
});
let (mut merged_ingredients, ingredients): (Vec<(Ingredient, Vec<String>)>, _) = {
let v = ingredients.split_off(1);
(
ingredients.into_iter().map(|(i, s)| (i, vec![s])).collect(),
v,
)
};
for (ingredient, recipe) in ingredients {
// If it can be summed to the last item of merged_ingredients, do it;
// else append it
let (last_i, last_rs) = merged_ingredients.last_mut().unwrap();
if last_i.name == ingredient.name && last_i.unit == ingredient.unit {
last_i.amount += ingredient.amount;
last_rs.push(recipe);
} else {
merged_ingredients.push((ingredient, vec![recipe]));
}
}
merged_ingredients
}
fn prepare_grocery_list(ingredients: &Vec<(Ingredient, Vec<String>)>) -> Result<String> {
let mut out = String::new();
use std::fmt::Write;
@ -103,9 +130,11 @@ fn prepare_grocery_list(ingredients: &Vec<(Ingredient, String)>) -> Result<Strin
chrono::Local::now().format("%Y-%m-%d").to_string()
)?;
writeln!(out)?; // leave an empty line
for ingredient in ingredients {
let ingredient_s = ingredient.0 .0.as_str();
writeln!(out, "- [ ] {} ({})", ingredient_s, ingredient.1)?;
for (ingredient, recipes) in ingredients {
writeln!(out, "- [ ] {}", ingredient)?;
for recipe in recipes {
writeln!(out, " * {}", recipe)?;
}
}
Ok(out)

View File

@ -60,9 +60,19 @@ pub struct Recipe {
//pub nutrition: Nutrition,
}
#[derive(Deserialize, Debug, Ord, Eq, PartialEq, PartialOrd)]
#[serde(rename_all = "camelCase")]
pub struct Ingredient(pub String);
#[derive(Debug, PartialEq, PartialOrd)]
pub struct Ingredient {
pub name: String,
pub amount: f64,
pub unit: Unit,
}
#[derive(Debug, Eq, PartialEq, PartialOrd)]
pub enum Unit {
None,
Kilogram,
Liter,
}
#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
@ -130,3 +140,144 @@ impl Recipe {
.unwrap_or_else(|| self.prep_time + self.cook_time.unwrap_or(Duration::zero()))
}
}
impl<'de> Deserialize<'de> for Ingredient {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(IngredientVisitor)
}
}
struct IngredientVisitor;
impl<'de> serde::de::Visitor<'de> for IngredientVisitor {
type Value = Ingredient;
fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
where
E: serde::de::Error,
{
use std::cmp::min;
let quantity_regex_start: regex::Regex =
regex::Regex::new(r"^(?P<v>[0-9,\.]+)\s*(?P<u>\w+)?\s+(?P<i>.*)").unwrap();
let quantity_regex_end: regex::Regex =
regex::Regex::new(r"(?P<i>.*?)\s+(?P<v>[0-9,\.]+)\s*(?P<u>\w+)?$").unwrap();
if let Some(captures) = quantity_regex_start
.captures(value)
.or_else(|| quantity_regex_end.captures(value))
{
let v = captures.name("v").unwrap().as_str();
let um = captures.name("u");
let u = um.map(|u| u.as_str()).unwrap_or("");
let im = captures.name("i").unwrap();
let i = im.as_str();
let (amount, unit) = Self::parse_quantity(v, u)?;
let name = match unit {
Unit::None => {
// pick the longest string including what was recognized by the regex as the possible unit
let start = um
.map(|um| min(um.start(), im.start()))
.unwrap_or_else(|| im.start());
&value[start..im.end()]
}
_ => i,
}
.to_owned();
Ok(Ingredient { name, amount, unit })
} else {
Ok(Ingredient {
name: value.to_owned(),
amount: 1.0,
unit: Unit::None,
})
}
}
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
formatter.write_str("a parseable ingredient name with an optional mass or volume quantity at the beginning or end")
}
}
impl IngredientVisitor {
fn parse_quantity<E>(value: &str, unit: &str) -> Result<(f64, Unit), E>
where
E: serde::de::Error,
{
let mut v = value
.parse::<f64>()
.map_err(|e| serde::de::Error::custom(e.to_string()))?;
let u = match unit.to_lowercase().as_str() {
"kg" => Unit::Kilogram,
"g" | "gr" => {
v = v / 1000.0;
Unit::Kilogram
}
"hg" => {
v = v / 10.0;
Unit::Kilogram
}
"l" => Unit::Liter,
"dl" => {
v = v / 10.0;
Unit::Liter
}
"cl" => {
v = v / 100.0;
Unit::Liter
}
"ml" => {
v = v / 1000.0;
Unit::Liter
}
"tl" => {
v = v / 1000.0 * 5.0;
Unit::Liter
}
"el" => {
v = v / 1000.0 * 15.0;
Unit::Liter
}
"tsp" => {
v = v / 1000.0 * 4.93;
Unit::Liter
}
"tblsp" => {
v = v / 1000.0 * 14.79;
Unit::Liter
}
_ => Unit::None,
};
Ok((v, u))
}
}
impl core::fmt::Display for Ingredient {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{amount:.3}{unit} {name}",
name = self.name,
amount = self.amount,
unit = self.unit
)
}
}
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 {
Unit::Kilogram => &"kg",
Unit::Liter => &"L",
Unit::None => &"",
};
write!(f, "{}", u)
}
}