terminal output

src/main.rs

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+use clap::{Parser, ValueEnum};
+use colored::*;
+
+/// Concentration of plaster slurry
+/// in parts of water per 100 parts plaster by weight
+const DEFAULT_CONCENTRATION: f64 = 70.0;
+/// Density of plaster slurry (g/L).
+const DEFAULT_DENSITY: f64 = 1674.0;
+const PERCENT: f64 = 100.0;
+/// The amount of slack added
+const SLACK: f64 = 0.10;
+/// The multiplier for the water that becomes part of the mold
+///
+/// 18 parts water for every part plaster becomes part
+/// of the mold.
+const DRY_WEIGHT_MULTIPLIER: f64 = 1.18;
+
+// Color and Styling Configurations
+const COLOR_PARAM: Color = Color::Yellow;
+const COLOR_PLASTER: Color = Color::Green;
+const COLOR_WATER: Color = Color::Blue;
+const COLOR_TARGET: Color = Color::Magenta;
+
+#[derive(ValueEnum, Clone, Copy, Debug, PartialEq, Eq)]
+enum ColorChoice {
+    Never,
+    Auto,
+    Always,
+}
+
+#[derive(Parser, Debug)]
+#[command(author, version, about = "Calculates plaster mixing weights", long_about = None)]
+struct Args {
+    /// Volume in cm³ or ml
+    volume: f64,
+
+    /// Concentration (parts water per 100 parts plaster by weight)
+    #[arg(short, long, default_value_t = 70.0)]
+    concentration: f64,
+
+    /// Density in grams per liter (defaults to 1674 if concentration is 70)
+    #[arg(short, long)]
+    density: Option<f64>,
+
+    /// Control terminal color output
+    #[arg(long, default_value = "auto")]
+    color: ColorChoice,
+}
+
+fn main() {
+    let args = Args::parse();
+
+    // Configure color output globally based on the CLI argument
+    match args.color {
+        ColorChoice::Always => colored::control::set_override(true),
+        ColorChoice::Never => colored::control::set_override(false),
+        ColorChoice::Auto => {} // Respects standard stream capabilities (default)
+    }
+
+    // Determine density and target wet weight
+    let density = args.density.or_else(|| {
+        if (args.concentration - DEFAULT_CONCENTRATION).abs() < f64::EPSILON {
+            Some(DEFAULT_DENSITY)
+        } else {
+            None
+        }
+    });
+    let target_wet_weight = density.map(|d| (args.volume / 1000.0) * d);
+
+    let (plaster_nominal, water_nominal) = match target_wet_weight {
+        Some(wet_weight) => {
+            let plaster = wet_weight / (1.0 + (args.concentration / PERCENT));
+            let water = plaster * (args.concentration / PERCENT);
+            (Some(plaster), Some(water))
+        }
+        None => (None, None),
+    };
+
+    // Output Header
+    println!("--- Plaster Calculation Parameters ---");
+    println!(
+        "Volume:        {}ml",
+        format!("{}", args.volume).color(COLOR_PARAM).bold()
+    );
+    println!(
+        "Concentration: {}g water per 100g plaster",
+        format!("{}", args.concentration).color(COLOR_PARAM).bold()
+    );
+
+    let density_str = density.map_or("Not provided/calculated".to_string(), |d| {
+        format!("{}g/L", format!("{}", d).color(COLOR_PARAM).bold())
+    });
+    println!("Density:       {}", density_str);
+    println!("--------------------------------------");
+
+    // Output Mixing Amounts and Target Weights
+    if let (Some(p_nom), Some(w_nom)) = (plaster_nominal, water_nominal) {
+        let p_slack = p_nom * (1.0 + SLACK);
+        let w_slack = w_nom * (1.0 + SLACK);
+        let dry_weight = p_nom * DRY_WEIGHT_MULTIPLIER;
+
+        println!("Mixing Amounts:");
+        println!(" Nominal:");
+        println!(
+            "    Plaster:  {}g",
+            format!("{:.1}", p_nom).color(COLOR_PLASTER)
+        );
+        println!(
+            "    Water:    {}g",
+            format!("{:.1}", w_nom).color(COLOR_WATER)
+        );
+        println!(" {:2}% Slack:", SLACK * PERCENT);
+        println!(
+            "    Plaster:  {}g",
+            format!("{:.1}", p_slack).color(COLOR_PLASTER).bold()
+        );
+        println!(
+            "    Water:    {}g",
+            format!("{:.1}", w_slack).color(COLOR_WATER).bold()
+        );
+
+        println!("\nTarget Weights:");
+        println!(
+            "    Wet Cast: {}g",
+            format!("{:.1}", target_wet_weight.unwrap())
+                .color(COLOR_TARGET)
+                .bold()
+        );
+        println!(
+            "    Dry Cast: {}g",
+            format!("{:.1}", dry_weight).color(COLOR_TARGET).bold()
+        );
+    } else {
+        println!("{}", 
+            "Target weights and mixing amounts cannot be calculated. Please specify a density with `-d` for any non-70 concentration.".red()
+        );
+    }
+}