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Customize triangle type
+61
-3
+61
-3
sierpinski
+61
-3
sierpinski
···
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use argh::FromArgs;
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const TRIANGLE: char = '▲';
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use std::fmt;
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use std::str::FromStr;
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const DELTA: &str = "Δ";
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const FILLED_TRIANGLE: &str = "▲";
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const HOLLOW_TRIANGLE: &str = "△";
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const DOT: &str = ".";
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const CARAT: &str = "^";
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#[derive(Copy, Clone)]
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enum TriangleType {
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Delta,
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Filled,
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Hollow,
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Dot,
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Carat,
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}
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impl fmt::Display for TriangleType {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let displayable = match self {
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TriangleType::Delta => DELTA,
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TriangleType::Filled => FILLED_TRIANGLE,
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TriangleType::Hollow => HOLLOW_TRIANGLE,
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TriangleType::Dot => DOT,
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TriangleType::Carat => CARAT,
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};
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write!(f, "{}", displayable)
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}
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}
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impl FromStr for TriangleType {
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type Err = String;
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fn from_str(value: &str) -> Result<TriangleType, String> {
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let triangle =
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match value.to_lowercase().as_str() {
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"delta" => TriangleType::Delta,
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"filled" => TriangleType::Filled,
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"hollow" => TriangleType::Hollow,
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"dot" => TriangleType::Dot,
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"carat" => TriangleType::Carat,
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_ => return Err(
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"unrecognized triangle type. try one of: delta, filled, hollow, dot, or carat."
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.to_string(),
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),
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};
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Ok(triangle)
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}
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}
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#[derive(FromArgs)]
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#[argh(description = "Prints a Sierpinski triangle.")]
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struct App {
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#[argh(
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option,
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description = "triangle type to use.",
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default = "TriangleType::Filled"
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)]
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triangle: TriangleType,
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#[argh(positional, description = "size of the Sierpinski triangle.")]
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size: Option<u8>,
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}
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fn main() {
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let App { size } = argh::from_env();
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let App { size, triangle } = argh::from_env();
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let size = size.unwrap_or(1);
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let height = 2_usize.pow(size as u32);
···
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if cell == 0 || cell % 2 == 0 {
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print!(" ");
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} else {
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print!("{}", TRIANGLE);
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print!("{}", triangle);
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}
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}
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println!();