Added simple commands

src/command/mod.rs

@@ -0,0 +1,140 @@
+use std::io::Write;
+
+use termion::{
+	raw::RawTerminal,
+	color,
+	style,
+	clear,
+	cursor
+};
+
+pub fn is_command(
+	s: &String
+) -> bool {
+	match &s.trim()[..] {
+		"help" | "clear"
+		| "ops" | "operators"
+		| "fns" | "functions"
+		=> true,
+		_ => false
+	}
+}
+
+
+#[inline(always)]
+fn draw_greeter(stdout: &mut RawTerminal<std::io::Stdout>) -> Result<(), std::io::Error> {
+	write!(
+		stdout,
+	"\n \
+	{a} ###### {b} @@@@@@\r\n \
+	{a}#     ##{b}@@     @\r\n \
+	{a}##     #{b}@     @@\r\n \
+	{a}  {b}@@@@@@@@@@@@@{a}\r\n \
+	{b}@@     @{a}#     ##\r\n \
+	{b}@     @@{a}##     #\r\n \
+	{b} @@@@@@ {a} ###### {r}\r\n \
+	\n  {t}Daisy{r}  {v}v{ver}{r}\r\n\n",
+		r = format!("{}{}", color::Fg(color::Reset), style::Reset),
+		a = color::Fg(color::Magenta),
+		b = color::Fg(color::White),
+		t = format!("{}{}", color::Fg(color::White), style::Bold),
+		v = format!("{}{}", color::Fg(color::White), style::Italic),
+		ver = env!("CARGO_PKG_VERSION"),
+	)?;
+
+	return Ok(());
+}
+
+
+#[inline(always)]
+pub fn do_command(
+	stdout: &mut RawTerminal<std::io::Stdout>,
+	s: &String
+) -> Result<(), std::io::Error> {
+
+	match &s[..] {
+		"help" => {
+			draw_greeter(stdout)?;
+
+			write!(stdout,
+				concat!(
+					"╞═════════════ {t}Commands{r} ═════════════╡\r\n",
+					"    {c}help{r}   Show this help\r\n",
+					"    {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}ops{r}    List built-in operators\r\n",
+					"    {c}fns{r}    List built-in functions\r\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)
+			)?;
+		},
+
+		"clear" => {
+			write!(
+				stdout,
+				"{}{}",
+				clear::All,
+				cursor::Goto(0, 0)
+			)?;
+		},
+
+		"ops" | "operators" => {
+			write!(stdout,
+				concat!(
+					"\r\n",
+					"Operators, sorted by priority (high to low).\r\n",
+					"High-piority operators are applied first.\r\n\n",
+					"╞═════ {t}Operator{r} ═════╪═════ {t}Syntax{r} ═════╡\r\n",
+					"  function             {c}sin, cos, etc{r}\r\n",
+					"  factorial            {c}!{r}\r\n",
+					"  powers               {c}^, **{r}\r\n",
+					"  implicit multiply    {c}3π, 3(2+1), etc{r}\r\n",
+					"  square root          {c}sqrt, rt, √{r}\r\n",
+					"  negate               {c}-3, -(1 + 2){r}\r\n",
+					"  modulo (short)       {c}%{r}\r\n",
+					"  multiply, divide     {c}*, /, ×, ÷{r}\r\n",
+					"  add, subtract        {c}+, -{r}\r\n",
+					"  modulo (long)        {c}mod{r}\r\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)
+			)?;
+		},
+
+		"fns" | "functions" => {
+			write!(stdout,
+				concat!(
+					"\r\n╞═══════ {t}Function{r} ═══════╪══════ {t}Syntax{r} ══════╡\r\n",
+					"  absolute value           {c}abs{r}\r\n",
+					"  floor, ceiling, round    {c}floor, ceil, round{r}\r\n",
+					"  log base e               {c}ln{r}\r\n",
+					"  log base 10              {c}log{r}\r\n",
+					"  sin, arcsin, cosecant    {c}sin, asin, csc{r}\r\n",
+					"  cos, arccos, secant      {c}cos, acos, secant{r}\r\n",
+					"  tan, arctan, cotan       {c}tan, atan, cot{r}\r\n",
+					"  hyperbolic sin, etc      {c}sinh, asinh, csch{r}\r\n",
+					"  hyperbolic cos, etc      {c}cosh, acosh, sech{r}\r\n",
+					"  hyperbolic tan, etc      {c}tanh, atanh, coth{r}\r\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)
+			)?;
+		},
+		_ => panic!("Bad command!")
+	};
+
+	return Ok(());
+}