From 06083dbce9a03d3b78d16e62dc9d6c297959d545 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= <juhani@krekelä.fi>
Date: Sat, 13 May 2023 17:50:18 +0300
Subject: [PATCH] First commit

---
 .gitignore         |  1 +
 Cargo.lock         |  7 ++++
 Cargo.toml         |  8 +++++
 src/conversions.rs | 90 ++++++++++++++++++++++++++++++++++++++++++++++
 src/lib.rs         |  6 ++++
 src/main.rs        |  7 ++++
 src/units.rs       | 30 ++++++++++++++++
 7 files changed, 149 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/conversions.rs
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs
 create mode 100644 src/units.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..6636a95
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "metrify"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cfc5bc6
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "metrify"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/src/conversions.rs b/src/conversions.rs
new file mode 100644
index 0000000..963f8a4
--- /dev/null
+++ b/src/conversions.rs
@@ -0,0 +1,90 @@
+use crate::units::{Metric, MetricQuantity, NonMetric, NonMetricQuantity};
+
+struct Conversion {
+	from: f64,
+	to: MetricQuantity,
+}
+
+fn get_conversion(unit: NonMetric) -> Conversion {
+	match unit {
+		// Length
+		NonMetric::Foot => Conversion {
+			from: 10_000.0,
+			to: MetricQuantity { amount: 3048.0, unit: Metric::Metre },
+		},
+		NonMetric::Inch => Conversion {
+			from: 10_000.0,
+			to: MetricQuantity { amount: 254.0, unit: Metric::Metre },
+		},
+		NonMetric::Yard => Conversion {
+			from: 10_000.0,
+			to: MetricQuantity { amount: 9144.0, unit: Metric::Metre },
+		},
+		NonMetric::Mile => Conversion {
+			from: 1_000.0,
+			to: MetricQuantity { amount: 1609344.0, unit: Metric::Metre },
+		},
+		// Weight
+		NonMetric::Ounce => Conversion {
+			from: 1_000_000_000.0,
+			to: MetricQuantity { amount: 28349523125.0, unit: Metric::Gram },
+		},
+		NonMetric::Pound => Conversion {
+			from: 100_000.0,
+			to: MetricQuantity { amount: 45359237.0, unit: Metric::Gram },
+		},
+		NonMetric::Stone => Conversion {
+			from: 100_000.0,
+			to: MetricQuantity { amount: 635029318.0, unit: Metric::Gram },
+		},
+	}
+}
+
+pub fn convert(from: NonMetricQuantity) -> MetricQuantity {
+	let conversion = get_conversion(from.unit);
+	let amount = from.amount * conversion.to.amount / conversion.from;
+	let unit = conversion.to.unit;
+	MetricQuantity { amount, unit }
+}
+
+#[cfg(test)]
+mod test {
+	use super::*;
+
+	struct Test(NonMetric, f64);
+
+	fn run_tests(tests: &[Test], unit: Metric) {
+		for test in tests {
+			let from = NonMetricQuantity {
+				amount: 1.0,
+				unit: test.0,
+			};
+			let to = MetricQuantity {
+				amount: test.1,
+				unit: unit,
+			};
+			assert_eq!(convert(from), to);
+		}
+	}
+
+	#[test]
+	fn length() {
+		let tests = [
+			Test(NonMetric::Inch, 0.0254),
+			Test(NonMetric::Foot, 0.3048),
+			Test(NonMetric::Yard, 0.9144),
+			Test(NonMetric::Mile, 1609.344),
+		];
+		run_tests(&tests, Metric::Metre);
+	}
+
+	#[test]
+	fn weight() {
+		let tests = [
+			Test(NonMetric::Ounce, 28.349523125),
+			Test(NonMetric::Pound, 453.59237),
+			Test(NonMetric::Stone, 6350.29318),
+		];
+		run_tests(&tests, Metric::Gram);
+	}
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..42089ba
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,6 @@
+mod units;
+mod conversions;
+
+pub use units::{NonMetric, NonMetricQuantity};
+
+pub use conversions::convert;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d3f6a74
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,7 @@
+use metrify::{NonMetric, NonMetricQuantity};
+use metrify::convert;
+
+fn main() {
+	let quantity = NonMetricQuantity { amount: 6.0, unit: NonMetric::Foot };
+	dbg!(convert(quantity));
+}
diff --git a/src/units.rs b/src/units.rs
new file mode 100644
index 0000000..dca8437
--- /dev/null
+++ b/src/units.rs
@@ -0,0 +1,30 @@
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Metric {
+	Metre,
+	Gram,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum NonMetric {
+	// Length
+	Foot,
+	Inch,
+	Mile,
+	Yard,
+	// Weight
+	Ounce,
+	Pound,
+	Stone,
+}
+
+#[derive(Debug, PartialEq)]
+pub struct MetricQuantity {
+	pub amount: f64,
+	pub unit: Metric,
+}
+
+#[derive(Debug, PartialEq)]
+pub struct NonMetricQuantity {
+	pub amount: f64,
+	pub unit: NonMetric,
+}