Added CtoF and FtoC

CONTRIBUTING.MD

@@ -29,3 +29,4 @@ What to do
  - `cargo publish`
  - Update web demo & pull server (`make docker`)
  - Update aur package
+ - Update `default.nix` (test with `make nix`)

Cargo.lock

@@ -28,7 +28,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "daisycalc"
-version = "1.1.5"
+version = "1.1.7"
 dependencies = [
  "cfg-if",
  "num",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "daisycalc"
-version = "1.1.5"
+version = "1.1.7"
 edition = "2021"
 build = "buildscript/main.rs"
 license = "GPL-3.0-only"

Makefile

@@ -1,6 +1,9 @@
 release:
 	cargo build --release
 
+nix:
+	nix-build -E 'let pkgs = import <nixpkgs> { }; in pkgs.callPackage ./default.nix {}'
+
 test:
 	cargo test
 

README.md

@@ -14,17 +14,17 @@ Many features are missing, this is still under development.
  - **Nix:** Use `default.nix`. Daisy isn't in nixpkgs yet, you'll need to add something like the following to `configuration.nix`:
 
 ```nix
-	let
+let
   daisy = builtins.fetchGit {
     url = "https://github.com/rm-dr/daisy.git";
     ref = "master";
   } + /default.nix;
-	in
-	{
+in
+{
   environment.systemPackages = with pkgs; [
     (callPackage daisy { })
   ];
-	}
+}
 ```
 
 # 📹 Screenshot
@@ -33,9 +33,7 @@ Many features are missing, this is still under development.
 
 # 🛠️ Features
  - Open-source
- - Extremely high precision
-	 - Uses a rational datatype when possible, and a high-precision float when not.
- - Pretty printing in prompt (with special substitutions)
+ - Carefully designed and easy-to-read prompt
  - Supports many physical units, with metric and binary prefixes
  - Supports exponential notation
  - Clear syntax, parsed input is always re-printed as a sanity check.
@@ -77,6 +75,10 @@ Daisy instead provides four functions (`fromCelsius`, `toCelsius`, `fromFahrenhe
  - "from" functions take a scalar and return a value in Kelvin: `fromCelsius(0) = 273.15K`
  - "to" functions take a value in Kelvin and return a scalar: `toCelsius(273.15 K) = 0`
 
+Functions `FtoC` and `CtoF` are also provided:
+ - `FtoC(x) = toCelsius(fromFahrenheit(x))`
+ - `CtoF(x) = toFahrenheit(fromCelsius(x))`
+
 
 ## Multiplication Order
 

TODO.md

@@ -20,6 +20,8 @@
  - Sums and products with functional arguments
  - Add functions: gcd, inverse mod, dice
  - Tuple operations
+ - Number theory: select a group, inverses, etc
+ - Negative mod
 
 ## Prompt
  - Fix terminal color detection

default.nix

@@ -1,17 +1,17 @@
 { lib, fetchgit, rustPlatform }:
 rustPlatform.buildRustPackage rec {
 	pname = "daisy";
-	version = "1.1.4";
+	version = "1.1.7";
 	cargoLock.lockFile = src + /Cargo.lock;
 
-	src = fetchgit {
+	src = builtins.fetchGit {
 		url = "https://github.com/rm-dr/daisy.git";
-		rev = "v${version}";
-		sha256 = "sha256-aENuKtE1+tBRN0HZzRr8Gk+dVEYTiP6FNRz817Sk88o=";
+		ref = "refs/tags/v${version}";
+		#rev = ""; Ideally, we'd have a hash here, but that would make git history messy.
 	};
 
 	meta = with lib; {
-		description = "A pretty command-line scientific calculator";
+		description = "A general-purpose scientific calculator";
 		homepage = "https://github.com/rm-dr/daisy";
 		#license = licenses.GPL;
 		maintainers = [ maintainers.tailhook ];

src/command/mod.rs

@@ -152,6 +152,9 @@ pub fn do_command(
 					"  Fahrenheit to Kelvin     [c]fromF, fromFahrenheit[n]\n",
 					"  Kelvin to Fahrenheit     [c]toF,   toFahrenheit[n]\n",
 					"\n",
+					"  Celsius to Fahrenheit    [c]CtoF[n]\n",
+					"  Fahrenheit to Celsius    [c]FtoC[n]\n",
+					"\n",
 					"  convert to base unit     [c]tobase[n]\n",
 					"  remove units             [c]nounit[n]\n",
 					"\n\n"
@@ -247,7 +250,7 @@ pub fn do_command(
 			if args.len() != 2 {
 				return FormattedText::new(
 					format!(
-						"[c]{first}[n] [t]takes exactly one argument.[n]\n\n",
+						"[c]{first}[n] [e]takes exactly one argument.[n]\n\n",
 					)
 				);
 			}
@@ -261,7 +264,7 @@ pub fn do_command(
 				Err(()) => {
 					FormattedText::new(
 						format!(
-							"[c]{v}[n] [t]isn't a variable.[n]\n\n",
+							"[c]{v}[n] [e]isn't a variable.[n]\n\n",
 						)
 					)
 				}

src/context.rs

@@ -90,6 +90,7 @@ impl Context {
 
 	pub fn delete(&mut self, s: &String) -> Result<(), ()> {
 		if !(self.is_varible(s) || self.is_function(s)) { return Err(()) };
+		if s == "ans" { return Err(()) };
 		if self.is_varible(s) { self.variables.remove(s); }
 		if self.is_function(s) { self.functions.remove(s); }
 		return Ok(());

src/evaluate/evaluate.rs

@@ -63,7 +63,7 @@ pub fn evaluate(
 
 					context.get_variable(&s)
 				},
-				Expression::Operator(_, Operator::Function(_), _) => { eval_function(g)? },
+				Expression::Operator(_, Operator::Function(_), _) => { eval_function(context, g)? },
 				Expression::Operator(_, _, _) => { eval_operator(context, g)? },
 			};
 

src/evaluate/function.rs

@@ -1,13 +1,17 @@
+use std::collections::VecDeque;
+
 use crate::parser::Expression;
 use crate::parser::Function;
 use crate::parser::Operator;
 use crate::parser::LineLocation;
 use crate::quantity::FreeUnit;
+use crate::quantity::Unit;
 use crate::quantity::WholeUnit;
 use crate::quantity::Quantity;
 use crate::quantity::Scalar;
 use crate::errors::DaisyError;
-
+use crate::context::Context;
+use super::evaluate;
 
 // If unitless, do nothing
 // If compatible with radians, convert to radians and return unitless
@@ -26,7 +30,7 @@ fn to_radians(q: Quantity) -> Result<Quantity, ()> {
 
 
 
-pub fn eval_function(g: &Expression) -> Result<Option<Expression>, (LineLocation, DaisyError)> {
+pub fn eval_function(context: &mut Context, g: &Expression) -> Result<Option<Expression>, (LineLocation, DaisyError)> {
 
 	let Expression::Operator(loc, Operator::Function(f), args) = g else {unreachable!()};
 
@@ -150,21 +154,82 @@ pub fn eval_function(g: &Expression) -> Result<Option<Expression>, (LineLocation
 		},
 
 
+		Function::CtoF => {
+			return Ok(evaluate(context,
+				&Expression::Operator(
+					*l + *loc,
+					Operator::Function(Function::ToFahrenheit),
+					VecDeque::from(vec![Expression::Operator(
+						*l + *loc,
+						Operator::Function(Function::FromCelsius),
+						VecDeque::from(vec![Expression::Quantity(*l, q.clone())])
+					)])
+				)
+			).ok());
+		},
+
+		Function::FtoC => {
+			return Ok(evaluate(context,
+				&Expression::Operator(
+					*l + *loc,
+					Operator::Function(Function::ToCelsius),
+					VecDeque::from(vec![Expression::Operator(
+						*l + *loc,
+						Operator::Function(Function::FromFahrenheit),
+						VecDeque::from(vec![Expression::Quantity(*l, q.clone())])
+					)])
+				)
+			).ok());
+		},
 
 		Function::ToCelsius => {
 			let mut k = Quantity::new_rational(1f64).unwrap();
 			k.insert_unit(FreeUnit::from_whole(WholeUnit::Kelvin), Scalar::new_rational(1f64).unwrap());
-			let Some(q) = q.convert_to(k) else { return Err((*loc + *l, DaisyError::IncompatibleUnit)) };
+
+			let q_s: String;
+			if q.unitless() {
+				q_s = String::from("scalar");
+			} else {
+				q_s = q.convert_to_base().unit().display(context);
+			}
+
+			let Some(q) = q.convert_to(k) else {
+				return Err((
+					*loc + *l,
+					DaisyError::IncompatibleUnits(
+						q_s,
+						Unit::from_free(FreeUnit::from_whole(WholeUnit::Kelvin)).display(context)
+					)
+				))
+			};
 
 			let mut r = q.without_unit();
 			r += Quantity::new_rational(-273.15f64).unwrap();
 
 			return Ok(Some(Expression::Quantity(*loc + *l, r)));
 		},
+
+
 		Function::ToFahrenheit => {
 			let mut k = Quantity::new_rational(1f64).unwrap();
 			k.insert_unit(FreeUnit::from_whole(WholeUnit::Kelvin), Scalar::new_rational(1f64).unwrap());
-			let Some(q) = q.convert_to(k) else { return Err((*loc + *l, DaisyError::IncompatibleUnit)) };
+
+			let q_s: String;
+			if q.unitless() {
+				q_s = String::from("scalar");
+			} else {
+				q_s = q.convert_to_base().unit().display(context);
+			}
+
+			let Some(q) = q.convert_to(k) else {
+				return Err((
+					*loc + *l,
+					DaisyError::IncompatibleUnits(
+						q_s,
+						Unit::from_free(FreeUnit::from_whole(WholeUnit::Kelvin)).display(context)
+					)
+				))
+			};
 
 			let mut r = q.without_unit();
 			r *= Quantity::new_rational_from_frac(9i64, 5i64).unwrap();
@@ -173,8 +238,18 @@ pub fn eval_function(g: &Expression) -> Result<Option<Expression>, (LineLocation
 
 			return Ok(Some(Expression::Quantity(*loc + *l, r)));
 		},
+
+
 		Function::FromCelsius => {
-			if !q.unitless() { return Err((*loc + *l, DaisyError::IncompatibleUnit));}
+			if !q.unitless() {
+				return Err((
+					*loc + *l,
+					DaisyError::IncompatibleUnits(
+						q.convert_to_base().unit().display(context),
+						"scalar".to_string()
+					)
+				));
+			}
 
 			let mut r = Quantity::new_rational(273.15f64).unwrap();
 			r += q.clone();
@@ -182,8 +257,18 @@ pub fn eval_function(g: &Expression) -> Result<Option<Expression>, (LineLocation
 
 			return Ok(Some(Expression::Quantity(*loc + *l, r)));
 		},
+
+
 		Function::FromFahrenheit => {
-			if !q.unitless() { return Err((*loc + *l, DaisyError::IncompatibleUnit));}
+			if !q.unitless() {
+				return Err((
+					*loc + *l,
+					DaisyError::IncompatibleUnits(
+						q.convert_to_base().unit().display(context),
+						"scalar".to_string()
+					)
+				));
+			}
 
 			let mut r = q.clone();
 			r += Quantity::new_rational(459.67).unwrap();

src/evaluate/operator.rs

@@ -124,6 +124,8 @@ pub fn eval_operator(context: &mut Context, g: &Expression) -> Result<Option<Exp
 			if let Expression::Quantity(la, a) = a {
 				if let Expression::Quantity(lb, b) = b {
 					if !a.unit.compatible_with(&b.unit) {
+						let a = a.convert_to_base().unit;
+						let b = b.convert_to_base().unit;
 
 						let a_s: String;
 						let b_s: String;

src/parser/expression/function.rs

@@ -37,7 +37,9 @@ pub enum Function {
 	FromCelsius,
 	ToCelsius,
 	FromFahrenheit,
-	ToFahrenheit
+	ToFahrenheit,
+	CtoF,
+	FtoC,
 }
 
 
@@ -74,6 +76,8 @@ impl ToString for Function {
 			Function::ToCelsius => {String::from("tocelsius") },
 			Function::FromFahrenheit => { String::from("fromfahrenheit") },
 			Function::ToFahrenheit => { String::from("tofahrenheit") },
+			Function::FtoC => { String::from("FtoC") },
+			Function::CtoF => { String::from("CtoF") },
 		}
 	}
 
@@ -126,6 +130,11 @@ impl Function {
 			"fromF"          => {Some(Function::FromFahrenheit)},
 			"fromfahrenheit" => {Some(Function::FromFahrenheit)},
 			"fromFahrenheit" => {Some(Function::FromFahrenheit)},
+
+			"FtoC" => {Some(Function::FtoC)},
+			"ftoc" => {Some(Function::FtoC)},
+			"ctof" => {Some(Function::CtoF)},
+			"CtoF" => {Some(Function::CtoF)},
 			_ => None
 		}
 	}

src/tests.rs

@@ -232,5 +232,11 @@ fn functions() {
 
 	good_expr("2", "nounit(2 mm)");
 	good_expr("2", "nounit(2 meter * second)");
+
+	good_expr("37.778", "FtoC(100)");
+	good_expr("73.399", "CtoF(23)");
+	good_expr("-17.778", "FtoC(0)");
+	good_expr("31.999", "CtoF(0)");
+
 	//good_expr("5000 m²·g/(s²·A²)", "tobase(5H)");
 }