initial commit

.gitignore

@@ -0,0 +1,2 @@
+/target
+.Cargo.lock

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "fastrand"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7a407cfaa3385c4ae6b23e84623d48c2798d06e3e6a1878f7f59f17b3f86499"
+dependencies = [
+ "instant",
+]
+
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "roll"
+version = "0.1.0"
+dependencies = [
+ "fastrand",
+]

Cargo.toml

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+[package]
+name = "roll"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+fastrand = "1.8.0"

src/main.rs

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+use std::io::{Write};
+use std::{env, io};
+use std::process::exit;
+
+fn main() -> Result<(), io::Error> {
+    let args = env::args().collect::<Vec<String>>();
+    let name = &String::from("roll");
+    let name = args.first().unwrap_or(name);
+    if args.len() < 2 {
+        eprintln!("Usage: {name} [dice...]\n{}",
+        "\t Dice should be formatted [rolls]d[sides], e.g. 1d5, 5d6...");
+        exit(1);
+    }
+    let args: Vec<Vec<u32>> = args
+        .iter()
+        .skip(1)
+        .map(|x| x
+            .split('d')
+            .map(|y| y
+                .parse::<u32>()
+                .unwrap_or_else(|_| {
+                    eprintln!("{name}: {x}: {}",
+                        "Improperly formatted die (should be [rolls]d[sides]).");
+                    exit(1);
+                })).collect())
+        .collect();
+
+    for arg in args {
+        let rolls = *arg.first().unwrap();
+        let sides = *arg.last().unwrap();
+
+        let stdout = io::stdout();
+        let mut lock = stdout.lock();
+        for _ in 0..rolls {
+            let num = fastrand::u32(1..=sides);
+            writeln!(lock, "{}", num);
+        }
+    }
+
+    Ok(())
+}