Added variable and constant listing

buildscript/constants.rs

@@ -91,6 +91,96 @@ pub fn write(target: &Path) {
 	writeln!(file, "\t\t\t_ => None\n\t\t}}\n\t}}\n").unwrap();
 
 
+
+
+
+	writeln!(file,
+		concat!(
+			"\tpub fn all_consts() -> &'static [Constant] {{\n",
+			"\t\treturn &["
+		)
+	).unwrap();
+
+	for c in constants {
+		writeln!(file,
+			"\t\t\tConstant::{e},",
+			e = c["enum_name"].as_str().unwrap(),
+		).unwrap();
+	}
+
+	writeln!(file, "\t\t]\n\t}}\n").unwrap();
+
+
+
+
+
+
+	writeln!(file,
+		concat!(
+			"\tpub fn source_strings(&self) -> &'static [&'static str] {{\n",
+			"\t\tmatch self {{"
+		)
+	).unwrap();
+
+	for c in constants {
+		write!(file,
+			"\t\t\tConstant::{e} => &[",
+			e = c["enum_name"].as_str().unwrap(),
+		).unwrap();
+
+		if c["strings"].is_array() {
+			for s in c["strings"].as_array().unwrap() {
+				write!(file,
+					"\"{s}\",",
+					s = s.as_str().unwrap()
+				).unwrap();
+			}
+			write!(file,
+				"],",
+			).unwrap();
+		} else {
+			write!(file,
+				"\"{s}\"],",
+				s = c["strings"].as_str().unwrap()
+			).unwrap();
+		}
+
+		write!(file,
+			"\n",
+		).unwrap();
+	}
+
+	writeln!(file, "\t\t}}\n\t}}\n").unwrap();
+
+
+
+
+
+
+	writeln!(file,
+		concat!(
+			"\tpub fn pretty_name(&self) -> Option<&'static str> {{\n",
+			"\t\tmatch self {{"
+		)
+	).unwrap();
+
+	for c in constants {
+		if c.as_table().unwrap().contains_key("pretty_name") {
+			writeln!(file,
+				"\t\t\tConstant::{e} => Some(&\"{s}\"),",
+				e = c["enum_name"].as_str().unwrap(),
+				s = c["pretty_name"].as_str().unwrap()
+			).unwrap();
+		}
+	}
+
+	writeln!(file, "\t\t\t_ => None\n\t\t}}\n\t}}\n").unwrap();
+
+
+
+
+
+
 	writeln!(file,
 		concat!(
 			"\tpub fn value(&self) -> Expression {{\n",

buildscript/constants.toml

@@ -6,90 +6,108 @@
 # strings: string or string array. What strings will be parsed as this constant.
 #	The first entry in this array tells daisy how to print this constant.
 # value: value of this constant. Will be evaluated just like user input.
-# unit: true if this constant represents a "fake unit"
+# pretty_name: string, name of this constant in help texts.
+#	if this is missing, this constant will not be listed.
 
 [[constant]]
 enum_name = "Pi"
+pretty_name = "π"
 strings = ["π", "pi"]
 value = "3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067"
 
 [[constant]]
 enum_name = "Phi"
-strings = ["φ", "phi", "goldenratio"]
+pretty_name = "Golden ratio"
+strings = ["φ", "phi"]
 value = "1.618033988749894848204586834365638117720309179805762862135448622705260462818902449707207204189391137"
 
 [[constant]]
 enum_name = "Euler"
+pretty_name = "Euler's number"
 strings = "e"
 value = "2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427"
 
 [[constant]]
 enum_name = "LightSpeed"
+pretty_name = "Speed of light"
 strings = "c"
 value = "299792458 meter/second"
 
 [[constant]]
 enum_name = "ElectricConstant"
+pretty_name = "Electric constant"
 strings = ["ε₀", "epsilon_zero", "eps_zero", "electricconstant"]
 value = "8.8541878128e-12 F/m"
 
 [[constant]]
 enum_name = "ElectronCharge"
+pretty_name = "Electron charge"
 strings = ["electroncharge", "elementarycharge"]
 value = "1.602176634e-19 C"
 
 [[constant]]
 enum_name = "ElectronMass"
+pretty_name = "Electron mass"
 strings = ["me", "m_e", "electronmass"]
 value = "9.1093837015-31 kg"
 
 [[constant]]
 enum_name = "ProtonMass"
+pretty_name = "Proton mass"
 strings = ["mp", "m_p", "protonmass"]
 value = "1.67262192369e-27 kg"
 
 [[constant]]
 enum_name = "GravityConstant"
+pretty_name = "Graviational constant"
 strings = "G"
 value = "6.67430e-11 (m^3)/(s^2 * kg)"
 
 [[constant]]
 enum_name = "GravityEarth"
+pretty_name = "Standard Earth gravity"
 strings = ["g₀", "g_zero", "gravity"]
 value = "9.80665 m/(s^2)"
 
 [[constant]]
 enum_name = "BoltzmannConstant"
+pretty_name = "Boltzmann constant"
 strings = ["k_B", "boltzmannconstant"]
 value = "1.380649e-23 J/K"
 
 [[constant]]
 enum_name = "FaradayConstant"
+pretty_name = "Faraday constant"
 strings = ["faradayconstant"]
 value = "9.64853321233100184e4 C/mol"
 
 [[constant]]
 enum_name = "MagneticConstant"
+pretty_name = "Magnetic constant"
 strings = ["μ₀","mu_zero"]
 value = "1.25663706212 N/(A*A)"
 
 [[constant]]
 enum_name = "AvogadroConstant"
+pretty_name = "Avogadro constant"
 strings = ["N_A", "avogadroconstant"]
 value = "6.02214076e23 mol^-1"
 
 [[constant]]
 enum_name = "PlanckConstant"
+pretty_name = "Planck constant"
 strings = ["planckconstant"]
 value = "6.62607015e-34 J/Hz"
 
 [[constant]]
 enum_name = "Hbar"
+pretty_name = "Reduced Planck constant"
 strings = ["ℏ", "h_bar"]
 value = "planckconstant / (2 pi)"
 
 [[constant]]
 enum_name = "GasConstant"
+pretty_name = "Gas constant"
 strings = ["R", "gasconstant"]
 value = "avogadroconstant * boltzmannconstant"
 
@@ -112,95 +130,79 @@ value = "avogadroconstant * boltzmannconstant"
 enum_name = "MPG"
 strings = "mpg"
 value = "mile/gallon"
-unit = true
 
 
 [[constant]]
 enum_name = "MPH"
 strings = "mph"
 value = "mile/hour"
-unit = true
 
 [[constant]]
 enum_name = "DPI"
 strings = "dpi"
 value = "dot/inch"
-unit = true
 
 [[constant]]
 enum_name = "PPI"
 strings = "ppi"
 value = "pixel/inch"
-unit = true
 
 [[constant]]
 enum_name = "FPS"
 strings = "fps"
 value = "frame/second"
-unit = true
 
 [[constant]]
 enum_name = "PCT"
 strings = "pct"
 value = "0.01"
-unit = true
 
 [[constant]]
 enum_name = "PPM"
 strings = "ppm"
 value = "1e-6"
-unit = true
 
 [[constant]]
 enum_name = "PPB"
 strings = "ppb"
 value = "1e-9"
-unit = true
 
 [[constant]]
 enum_name = "PPT"
 strings = "ppt"
 value = "1e-12"
-unit = true
 
 [[constant]]
 enum_name = "PPQ"
 strings = "ppq"
 value = "1e-15"
-unit = true
 
 [[constant]]
 enum_name = "WH"
 strings = "Wh"
 value = "W * hour"
-unit = true
 
 [[constant]]
 enum_name = "KWH"
 strings = "kWh"
 value = "kW * hour"
-unit = true
 
 [[constant]]
 enum_name = "MWH"
 strings = "WMh"
 value = "MW * hour"
-unit = true
 
 [[constant]]
 enum_name = "GWH"
 strings = "GWh"
 value = "GW * hour"
-unit = true
 
 [[constant]]
 enum_name = "TWH"
 strings = "TWh"
 value = "TW * hour"
-unit = true
 
 [[constant]]
 enum_name = "PWH"
 strings = "PWh"
 value = "PW * hour"
-unit = true

buildscript/main.rs

@@ -16,6 +16,7 @@ fn main() -> Result<(), ()>{
 
 	units::write(&Path::new(&out_dir).join("units.rs"));
 	constants::write(&Path::new(&out_dir).join("constants.rs"));
+	//constants::write(&Path::new("constants.rs"));
 
 	return Ok(());
 }

src/command/mod.rs

@@ -1,4 +1,6 @@
 use std::io::Write;
+use crate::context::Context;
+use crate::parser::Constant;
 
 use termion::{
 	raw::RawTerminal,
@@ -15,12 +17,13 @@ pub fn is_command(
 		"help" | "clear"
 		| "ops" | "operators"
 		| "fns" | "functions"
+		| "vars"
+		| "consts" | "constants"
 		=> true,
 		_ => false
 	}
 }
 
-
 #[inline(always)]
 fn draw_greeter(stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io::Error> {
 	write!(
@@ -51,7 +54,8 @@ fn draw_greeter(stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io
 #[inline(always)]
 pub fn do_command(
 	stdout: &mut RawTerminal<std::io::Stdout>,
-	s: &String
+	s: &String,
+	context: &mut Context
 ) -> Result<(), std::io::Error> {
 
 	match &s[..] {
@@ -73,16 +77,15 @@ pub fn do_command(
 					"      {c}clear{r}  Clear the terminal\r\n",
 					"      {c}quit{r}   Exit daisy\r\n",
 					//"      {c}units{r}  List available units\r\n",
-					//"      {c}const{r}  List available constants\r\n",
+					"      {c}consts{r} List built-in constants\r\n",
 					"      {c}ops{r}    List built-in operators\r\n",
 					"      {c}fns{r}    List built-in functions\r\n",
-					"\n",
+					"      {c}vars{r}   List user-defined variables\r\n",
+					"\n\n",
 				),
 
 				r = format!("{}{}", color::Fg(color::Reset), style::Reset),
-
 				c = format!("{}{}", color::Fg(color::LightBlack), style::Italic),
-
 				t = format!("{}{}", color::Fg(color::Magenta), style::Bold)
 			)?;
 		},
@@ -115,7 +118,7 @@ pub fn do_command(
 					"  unit conversion      {c}to{r}\r\n",
 					"  division (long)      {c}per{r}\r\n",
 					"  modulo (long)        {c}mod{r}\r\n",
-					"\n"
+					"\n\n"
 				),
 
 				r = format!("{}{}", color::Fg(color::Reset), style::Reset),
@@ -146,7 +149,7 @@ pub fn do_command(
 					"\n",
 					"  convert to base unit     {c}tobase{r}\r\n",
 					"  remove units             {c}nounit{r}\r\n",
-					"\n"
+					"\n\n"
 				),
 
 				r = format!("{}{}", color::Fg(color::Reset), style::Reset),
@@ -154,6 +157,85 @@ pub fn do_command(
 				t = format!("{}{}", color::Fg(color::Magenta), style::Bold)
 			)?;
 		},
+
+		"vars" => {
+			let v = context.get_variables();
+
+			if v.len() == 0 {
+				write!(stdout,
+					"You have not defined any variables.\r\n\n",
+				)?;
+				return Ok(());
+			}
+
+			write!(stdout,
+				"\r\n╞═══ {t}User-Defined Variables{r} ═══╡\r\n",
+				r = format!("{}{}", color::Fg(color::Reset), style::Reset),
+				t = format!("{}{}", color::Fg(color::Magenta), style::Bold)
+			)?;
+
+
+
+			let mut longest = 0;
+			for (key, _) in v {
+				if key.len() > longest {
+					longest = key.len();
+				}
+			}
+
+			for (key, value) in v {
+				let padding = " ".repeat(longest - key.len());
+
+				write!(stdout,
+					concat!(
+						"  {k}{p} = {c}{v}{r}\r\n",
+					),
+					k = key, v = value.to_string(),
+					p = padding,
+					r = format!("{}{}", color::Fg(color::Reset), style::Reset),
+					c = format!("{}{}", color::Fg(color::LightBlack), style::Italic),
+				)?;
+			}
+
+			write!(stdout,
+				"\r\n\n",
+			)?;
+		},
+
+		"consts" | "constants" => {
+			let a = Constant::all_consts();
+
+			write!(stdout,
+				"\r\n╞═══ {t}Built-in Constants{r} ═══╡\r\n",
+				r = format!("{}{}", color::Fg(color::Reset), style::Reset),
+				t = format!("{}{}", color::Fg(color::Magenta), style::Bold)
+			)?;
+
+			for c in a {
+				let Some(p) = c.pretty_name() else { continue };
+
+				// If you subtract with overflow here,
+				// your padding length is too short.
+				let padding = " ".repeat(25 - p.chars().count());
+
+				write!(stdout,
+					"  {n}{p}: {c}{s}{r}",
+					p = padding,
+					n = p,
+					s = c.source_strings().join(", "),
+
+					r = format!("{}{}", color::Fg(color::Reset), style::Reset),
+					c = format!("{}{}", color::Fg(color::LightBlack), style::Italic),
+				)?;
+
+				write!(stdout, "\r\n")?;
+			}
+
+			write!(stdout,
+				"\r\n\n",
+			)?;
+		},
+
 		_ => unreachable!("Bad command!")
 	};
 

src/context.rs

@@ -38,4 +38,8 @@ impl Context {
 		}
 	}
 
+	pub fn get_variables(&self) -> &HashMap<String, Expression> {
+		return &self.variables
+	}
+
 }

src/entry/unix/unix.rs

@@ -129,12 +129,14 @@ fn do_expression(
 #[inline(always)]
 pub fn main() -> Result<(), std::io::Error> {
 	let mut stdout = stdout().into_raw_mode().unwrap();
+	let mut pb: PromptBuffer = PromptBuffer::new(64);
+	let mut context: Context = Context::new();
 
-	let args: Vec<String> = env::args().collect();
 
 	// Handle command-line arguments
+	let args: Vec<String> = env::args().collect();
 	if args.iter().any(|s| s == "--help") {
-		command::do_command(&mut stdout, &String::from("help"))?;
+		command::do_command(&mut stdout, &String::from("help"), &mut context)?;
 		return Ok(());
 	} else if args.iter().any(|s| s == "--version") {
 		write!(stdout, "Daisy v{}\r\n", env!("CARGO_PKG_VERSION"))?;
@@ -145,8 +147,6 @@ pub fn main() -> Result<(), std::io::Error> {
 	//let size = termion::terminal_size().unwrap();
 	//write!(stdout, "{:?}", size).unwrap();
 
-	let mut pb: PromptBuffer = PromptBuffer::new(64);
-	let mut context: Context = Context::new();
 
 
 	'outer: loop {
@@ -165,7 +165,7 @@ pub fn main() -> Result<(), std::io::Error> {
 						if in_str.trim() == "quit" {
 							break 'outer;
 						} else if command::is_command(&in_str) {
-							command::do_command(&mut stdout, &in_str)?;
+							command::do_command(&mut stdout, &in_str, &mut context)?;
 						} else {
 							let r = do_expression(&mut stdout, &in_str, &mut context);
 							if let Ok(t) = r { context.push_hist(t); }