Refactored code

src/bin/main.rs

@@ -1,27 +1,27 @@
 extern crate libroller;
-use libroller::config::Config;
+//use libroller::config::Config;
+use libroller::roll::Roll;
 use std::env;
 
 fn main() {
-    let roll = Config::new(&mut env::args());
-    for rolls in &roll.unwrap_or_else(|e| {println!("Application error: {}", e);
-            std::process::exit(1)}) 
-        {
-        let x = rolls.to_roll().unwrap_or_else(|e| { println!("Application error: {}", e);
-            std::process::exit(1);
+//    let roll = Config::new(&mut env::args());
+    let rolls = Roll::from_args(&mut env::args()).unwrap_or_else(|err| {
+        eprintln!("Error occured:{}", err);
+        std::process::exit(1)
     });
-        if x.number() > 1 && x.number() < 26 {
+    for roll in rolls {
+        if roll.number() > 1 && roll.number() < 26 {
             let mut total = 0;
-            println!("You're rolling {}", x);
-            for value in x.rolls() {
+            println!("You're rolling {}", roll);
+            for value in roll.rolls() {
                 println!("You rolled: {}", value);
                 total += value;
             }
             println!("Total value of dice = {}", total);
             println!("");
         }else {
-            println!("You're rolling {}", x);
-            println!("Total: {}", x.total())
+            println!("You're rolling {}", roll);
+            println!("Total: {}", roll.total())
         }
     }
 }

src/config.rs

@@ -52,8 +52,8 @@ impl Config {
     /// Converts a `Config` into a `Roll`. Returns a `Result` that's
     /// either `Ok(Roll)` or an `Err(_)`
     pub fn to_roll(&self) -> Result<Roll, ParseIntError> {
-        let number = self.first.parse::<u32>()?;
-        let die = self.second.parse::<u32>()?;
+        let number = self.first.parse::<usize>()?;
+        let die = self.second.parse::<usize>()?;
 
         Ok(Roll::new(number, die))
     }

src/lib.rs

@@ -2,6 +2,9 @@
 pub extern crate rand;
 pub mod roll;
 pub mod config;
+//pub mod error;
 
 pub use roll::*;
 pub use roll::Roll;
+pub use std::{num, io};
+//pub use error::RollError;

src/roll.rs

@@ -1,19 +1,21 @@
 //! A struct in which our data is held for rolling. By ensuring that
-//! only `u32`s are used we prevent the need for additional type
+//! only `usize`s are used we prevent the need for additional type
 //! checking at time of use. */
 extern crate rand;
 use rand::Rng;
 use std::fmt;
+use std::num::ParseIntError;
+use super::std;
 
 #[derive(Debug, Clone, PartialEq)]
 pub struct Roll {
-    die: u32,
-    number: u32,
+    die: usize,
+    number: usize,
 }
 impl Roll {
     /// A fn to create new `Roll` structs, private to prevent
     /// being used outside the library.
-    pub fn new(number: u32, die: u32) -> Roll {
+    pub fn new(number: usize, die: usize) -> Roll {
         Roll {
             die: die,
             number: number,
@@ -27,37 +29,51 @@ impl Roll {
     ///  let x = Roll::new(&2, &6);
     ///  assert!(x.number() == 2);
     ///  ```
-    pub fn number(&self) -> u32 {
+    pub fn number(&self) -> usize {
         self.number
     }
     /// Returns the value stored in the die field of a roll.
     /// Allows the fields of `Roll` to be private (and unchangable)
     /// while still allowing access to act on their internal value
-    pub fn die(&self) -> u32 {
+    pub fn die(&self) -> usize {
         self.die
     }
     /// Creates a Vector to hold each of the values rolled. Making
     ///a Vector ensures the ability to work on exactly the same
     ///die rolls easily and accurately, since calling the `Roll`
     ///iterator again will produce new results.
-    pub fn rolls(self) -> Vec<u32> {
+    pub fn rolls(self) -> Vec<usize> {
         self.collect()
     }
 
     /// Used on a `Roll` to return only the final value, ignoring
     ///the values used to add up to that result. Allows `.total()`
     ///syntax when used 
-    pub fn total(self) -> u32 {
+    pub fn total(self) -> usize {
     self.sum()
     }
+
+    pub fn from_args(args: &mut std::env::Args) -> Result<Vec<Roll>, ParseIntError> {
+        args.next();
+        let mut total: Vec<Roll> = vec![];
+        while args.len() >= 2 {
+            let roll: Vec<String> = args.take(2).collect();
+            total.push(Roll::new(
+                roll[0].parse::<usize>()?,
+                roll[1].parse::<usize>()?,
+                )
+            );
+        }
+        Ok(total)
+    }
 }
 
 /// Turns `Roll` into an `Iterator`, causing it to create a series of random
 ///numbers between 1 and the chosen die size. It counts down the number field
 ///of the `Roll` and returns `None` to end the iteration. It's only capable of
-///returning u32 values, which should never be a problem.
+///returning usize values, which should never be a problem.
 impl Iterator for Roll {
-    type Item = u32;
+    type Item = usize;
 
     fn next(&mut self) -> Option<Self::Item> {
         if self.number != 0 {