right let's try this one again

Cargo.toml

@@ -4,5 +4,6 @@ version = "0.1.0"
 authors = ["olivia <olivia@fastmail.com>"]
 
 [dependencies]
-quicli = "0.2.0"
-ansi_term = "0.11.0"
+clap = "2.32.0"
+indicatif = "0.9.0"
+console = "0.6.2"

README.md

@@ -1,44 +1,3 @@
 # rustlings
 
 A cool thing that is currently in development.
-
-## How it's structured
-
-Ideally, like RubyKoans, all exercises can be run by executing one command, in this case
-`cargo run` (most likely). This runs `src/main.rs`, which in turn runs all of the exercises.
-Each exercise is contained in a Rust file called `about_<exercise topic>.rs`. A minimal exercise looks
-somewhat like this:
-
-```rust
-fn exercise_function() {
-  "hello"
-}
-
-mod tests {
-  use super::*;
-  
-  pub fn test() {
-    verify!("REPLACE ME", exercise_function(), "Function description");
-  }
-}
-
-pub fn exec() {
-  tests::test();
-}
-```
-
-Each exercise file is supposed to have one `exec` function which gets called by the `main.rs` file.
-This function, in turn, calls all individual test functions.
-
-The tests themselves can generally be structured in whatever way is desired, there doesn't have to be a "tests" module, for example. Two macros are provided
-for convenience. The `verify` helper function is essentially a specialized `assert_eq!`, but it doesn't panic
-if the values mismatch, instead it prints out a helpful error message and keeps going. The
-`verify_easy` function is designed as a drop-in replacement for the `verify` function for if the learner needs help solving the exercise. It prints the expected value, too.
-
-This is roughly what the console output for a simple exercise looks right now:
-
-![](https://i.imgur.com/gGgjvLW.png)
-
-Keep in mind that this is a very early draft of how things work. Anything here might be changed
-at any time, and this documentation should be updated accordingly.
-

exercises/error_handling/errors2.rs

@@ -66,7 +66,7 @@ mod tests {
 // One way to handle this is using a `match` statement on
 // `item_quantity.parse::<i32>()` where the cases are `Ok(something)` and
 // `Err(something)`. This pattern is very common in Rust, though, so there's
-// a `try!` macro that does pretty much what you would make that match statement
+// a `?` operator that does pretty much what you would make that match statement
 // do for you! Take a look at this section of the Error Handling chapter:
-// https://doc.rust-lang.org/stable/book/error-handling.html#the-try-macro
-// and give it a `try!`
+// https://doc.rust-lang.org/stable/book/second-edition/ch09-02-recoverable-errors-with-result.html#a-shortcut-for-propagating-errors-the--operator
+// and give it a try!

exercises/error_handling/errors3.rs

@@ -1,7 +1,7 @@
 // errors3.rs
 // This is a program that is trying to use a completed version of the
 // `total_cost` function from the previous exercise. It's not working though--
-// we can't call the `try!` macro in the `main()` function! Why not?
+// we can't use the `?` operator in the `main()` function! Why not?
 // What should we do instead? Scroll for hints!
 
 use std::num::ParseIntError;
@@ -10,7 +10,7 @@ fn main() {
     let mut tokens = 100;
     let pretend_user_input = "8";
 
-    let cost = try!(total_cost(pretend_user_input));
+    let cost = total_cost(pretend_user_input)?;
 
     if cost > tokens {
         println!("You can't afford that many!");
@@ -23,7 +23,7 @@ fn main() {
 pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
     let processing_fee = 1;
     let cost_per_item = 5;
-    let qty = try!(item_quantity.parse::<i32>());
+    let qty = item_quantity.parse::<i32>()?;
 
     Ok(qty * cost_per_item + processing_fee)
 }
@@ -45,23 +45,18 @@ pub fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
 
 
 
-// Since the `try!` macro returns an `Err` early if the thing it's trying to
-// do fails, you can only use the `try!` macro in functions that have a
+// Since the `?` operator returns an `Err` early if the thing it's trying to
+// do fails, you can only use the `?` operator in functions that have a
 // `Result` as their return type.
 
-// The error that you get if you run this code is:
+// Hence the error that you get if you run this code is:
 
 // ```
-// error: mismatched types:
-// expected `()`,
-// found `std::result::Result<_, _>`
+// error[E0277]: the `?` operator can only be used in a function that returns `Result` (or another type that implements `std::ops::Try`)
 // ```
 
-// which is saying that the expected return type of the `main` function is
-// the empty tuple, but we tried to return a `Result`-- and that's happening
-// in the implementation of `try!`. The `main` function never has a return type,
-// so we have to use another way of handling a `Result` within `main`.
+// So we have to use another way of handling a `Result` within `main`.
 
 // Decide what we should do if `pretend_user_input` has a string value that does
-// not parse to an integer, and implement that instead of calling the `try!`
-// macro.
+// not parse to an integer, and implement that instead of using the `?`
+// operator.

exercises/error_handling/errorsn.rs

@@ -115,21 +115,21 @@ impl error::Error for CreationError {
 
 // Next hint: There are three places in `read_and_validate` that we call a
 // function that returns a `Result` (that is, the functions might fail).
-// Wrap those calls in a `try!` macro call so that we return immediately from
+// Apply the `?` operator on those calls so that we return immediately from
 // `read_and_validate` if those function calls fail.
 
-// Another hint: under the hood, the `try!` macro calls `From::from`
+// Another hint: under the hood, the `?` operator calls `From::from`
 // on the error value to convert it to a boxed trait object, a Box<error::Error>,
 // which is polymorphic-- that means that lots of different kinds of errors
 // can be returned from the same function because all errors act the same
 // since they all implement the `error::Error` trait.
 // Check out this section of the book:
-// https://doc.rust-lang.org/stable/book/error-handling.html#standard-library-traits-used-for-error-handling
+// https://doc.rust-lang.org/stable/book/second-edition/ch09-02-recoverable-errors-with-result.html#a-shortcut-for-propagating-errors-the--operator
 
-// Another another hint: Note that because the `try!` macro returns
+// Another another hint: Note that because the `?` operator returns
 // the *unwrapped* value in the `Ok` case, if we want to return a `Result` from
 // `read_and_validate` for *its* success case, we'll have to rewrap a value
-// that we got from the return value of a `try!` call in an `Ok`-- this will
+// that we got from the return value of a `?`ed call in an `Ok`-- this will
 // look like `Ok(something)`.
 
 // Another another another hint: `Result`s must be "used", that is, you'll

exercises/functions/functions5.rs

@@ -40,5 +40,8 @@ fn square(num: i32) -> i32 {
 
 // This is a really common error that can be fixed by removing one character.
 // It happens because Rust distinguishes between expressions and statements: expressions return
-// a value and statements don't. We want to return a value from the `square` function, but it
-// isn't returning one right now...
+// a value based on its operand, and statements simply return a () type which behaves just like `void` in C/C++ language. 
+// We want to return a value of `i32` type from the `square` function, but it is returning a `()` type...
+// They are not the same. There are two solutions:
+// 1. Add a `return` ahead of `num * num;`
+// 2. remove `;`, make it to be `num * num`

exercises/move_semantics/move_semantics1.rs

@@ -1,7 +1,7 @@
 // move_semantics1.rs
 // Make me compile! Scroll down for hints :)
 
-pub fn main() {
+fn main() {
     let vec0 = Vec::new();
 
     let vec1 = fill_vec(vec0);

exercises/move_semantics/move_semantics2.rs

@@ -1,7 +1,7 @@
 // move_semantics2.rs
 // Make me compile without changing line 10! Scroll down for hints :)
 
-pub fn main() {
+fn main() {
     let vec0 = Vec::new();
 
     let mut vec1 = fill_vec(vec0);

exercises/move_semantics/move_semantics3.rs

@@ -3,7 +3,7 @@
 // (no lines with multiple semicolons necessary!)
 // Scroll down for hints :)
 
-pub fn main() {
+fn main() {
     let vec0 = Vec::new();
 
     let mut vec1 = fill_vec(vec0);

exercises/move_semantics/move_semantics4.rs

@@ -3,7 +3,7 @@
 // in `fn main`, we instead create it within `fn fill_vec` and transfer the
 // freshly created vector from fill_vec to its caller. Scroll for hints!
 
-pub fn main() {
+fn main() {
     let vec0 = Vec::new();
 
     let mut vec1 = fill_vec(vec0);

exercises/primitive_types/primitive_types3.rs

@@ -39,8 +39,9 @@ fn main() {
 
 
 // There's a shorthand to initialize Arrays with a certain size that does not 
-// require you to type in 100 items (but you certainly can if you want!)
-// Check out the Primitive Types -> Arrays section of the book:
-// https://doc.rust-lang.org/stable/book/second-edition/ch03-02-data-types.html#arrays
+// require you to type in 100 items (but you certainly can if you want!).
+// For example, you can do:
+// let array = ["Are we there yet?"; 10];
+
 // Bonus: what are some other things you could have that would return true
 // for `a.len() >= 100`?

exercises/primitive_types/primitive_types4.rs

@@ -38,12 +38,12 @@ fn main() {
 
 
 
-// Take a look at the Primitive Types -> Slices section of the book:
-// http://doc.rust-lang.org/stable/book/primitive-types.html#slices
+// Take a look at the Understanding Ownership -> Slices -> Other Slices section of the book:
+// https://doc.rust-lang.org/stable/book/second-edition/ch04-03-slices.html#other-slices
 // and use the starting and ending indices of the items in the Array
 // that you want to end up in the slice.
 
 // If you're curious why the right hand of the `==` comparison does not
 // have an ampersand for a reference since the left hand side is a
-// reference, take a look at the Deref coercions chapter:
-// http://doc.rust-lang.org/stable/book/deref-coercions.html
+// reference, take a look at the Deref coercions section of the book:
+// https://doc.rust-lang.org/stable/book/second-edition/ch15-02-deref.html#implicit-deref-coercions-with-functions-and-methods

exercises/primitive_types/primitive_types5.rs

@@ -0,0 +1,45 @@
+// primitive_types5.rs
+// Destructure the `cat` tuple so that the println will work.
+// Scroll down for hints!
+
+fn main() {
+    let cat = ("Furry McFurson", 3.5);
+    let /* your pattern here */ = cat;
+
+    println!("{} is {} years old.", name, age);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+// Take a look at the Data Types -> The Tuple Type section of the book:
+// https://doc.rust-lang.org/stable/book/second-edition/ch03-02-data-types.html#the-tuple-type
+// Particularly the part about destructuring (second to last example in the section). 
+// You'll need to make a pattern to bind `name` and `age` to the appropriate parts
+// of the tuple. You can do it!!

exercises/primitive_types/primitive_types6.rs

@@ -39,6 +39,7 @@ fn main() {
 
 
 // While you could use a destructuring `let` for the tuple here, try 
-// indexing into it instead, as explained here:
-// http://doc.rust-lang.org/stable/book/primitive-types.html#tuple-indexing
+// indexing into it instead, as explained in the last example of the 
+// Data Types -> The Tuple Type section of the book:
+// https://doc.rust-lang.org/stable/book/second-edition/ch03-02-data-types.html#the-tuple-type
 // Now you have another tool in your toolbox!

exercises/standard_library_types/iterator3.rs

@@ -114,7 +114,8 @@ mod tests {
 
 
 
-// Minor hint: In each of the two cases in the match in main, you can create x with either a 'turbofish' or by hinting the type of x to the compiler. You may try both.
+// Minor hint: In each of the two cases in the match in main, you can create x with either 
+// a 'turbofish' or by hinting the type of x to the compiler. You may try both.
 
 
 
@@ -142,4 +143,5 @@ mod tests {
 
 
 
-// Major hint: Have a look at the Iter trait and at the explanation of its collect function. Especially the part about Result is interesting.
+// Major hint: Have a look at the Iter trait and at the explanation of its collect function. 
+// Especially the part about Result is interesting.

exercises/threads/threads1.rs

@@ -45,7 +45,7 @@ fn main() {
 // to **immutable** data. But we want to *change* the number of `jobs_completed`
 // so we'll need to also use another type that will only allow one thread to
 // mutate the data at a time. Take a look at this section of the book:
-// https://doc.rust-lang.org/stable/book/concurrency.html#safe-shared-mutable-state
+// https://doc.rust-lang.org/stable/book/second-edition/ch16-03-shared-state.html#atomic-reference-counting-with-arct
 // and keep scrolling if you'd like more hints :)
 
 

old_curriculum/.travis.yml

@@ -1,19 +0,0 @@
-language: rust
-
-branches:
-  only:
-  - master
-
-cache:
-  cargo: true
-
-script:
-  - cargo run --bin generate_readme
-  - git config user.name "Carol (Nichols || Goulding)"
-  - git config user.email "carol.nichols@gmail.com"
-  - git commit -am "Regenerate README" && git remote add upstream "https://$GH_TOKEN@github.com/carols10cents/rustlings.git" && git push -q upstream HEAD:master > /dev/null 2>&1 || true
-
-notifications:
-  email:
-    on_success: never
-

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@@ -1,456 +0,0 @@
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old_curriculum/Cargo.toml

@@ -1,9 +0,0 @@
-[package]
-name = "rustlings"
-version = "0.1.0"
-authors = ["Carol (Nichols || Goulding) <carol.nichols@gmail.com>"]
-
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old_curriculum/README-template.hbs

@@ -1,190 +0,0 @@
-<!--
-{{ autogenerated_notice }}
--->
-
-# rustlings
-
-Small exercises to get you used to reading and writing Rust code. Includes practice reading and
-responding to compiler messages!
-
-This repo is very much the smallest thing that could possibly work :)
-
-## To do these exercises
-
-Thanks to [btbytes'](https://twitter.com/btbytes) [prlinks](https://github.com/btbytes/prlink), you
-can now click on the links below to load the exercises in the rust playground!
-
-There are infinite correct answers-- the exercises are sometimes left very open-ended. Scroll down
-in the playground to find comments that have hints.
-
-If you need more help or would like to compare solutions, you can ask in [#rust-beginners on
-irc.mozilla.org](https://chat.mibbit.com/?server=irc.mozilla.org&channel=%23rust-beginners ), the
-[user forum](https://users.rust-lang.org/), or [the subreddit](https://reddit.com/r/rust). If an
-exercise could be improved in any way, please [create an
-issue](https://github.com/carols10cents/rustlings/issues/new) or submit a pull request!
-
-### Variable bindings
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch03-01-variables-and-mutability.html)
-
-{{ playground_link "variables/variables1.rs" }}
-{{ playground_link "variables/variables2.rs" }}
-{{ playground_link "variables/variables3.rs" }}
-{{ playground_link "variables/variables4.rs" }}
-
-### Functions
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch03-03-how-functions-work.html)
-
-{{ playground_link "functions/functions1.rs" }}
-{{ playground_link "functions/functions2.rs" }}
-{{ playground_link "functions/functions3.rs" }}
-{{ playground_link "functions/functions4.rs" }}
-{{ playground_link "functions/functions5.rs" }}
-
-### Primitive types
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch03-02-data-types.html)
-
-{{ playground_link "primitive_types/primitive_types1.rs" }}
-{{ playground_link "primitive_types/primitive_types2.rs" }}
-{{ playground_link "primitive_types/primitive_types3.rs" }}
-{{ playground_link "primitive_types/primitive_types4.rs" }}
-{{ playground_link "primitive_types/primitive_types5.rs" }}
-{{ playground_link "primitive_types/primitive_types6.rs" }}
-
-### Tests
-
-Going out of order from the book to cover tests-- many of the following exercises will ask you to
-make tests pass!
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch11-01-writing-tests.html)
-
-{{ playground_link "tests/tests1.rs" }}
-{{ playground_link "tests/tests2.rs" }}
-{{ playground_link "tests/tests3.rs" }}
-{{ playground_link "tests/tests4.rs" }}
-
-### If
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch03-05-control-flow.html)
-
-{{ playground_link "if/if1.rs" }}
-
-### Strings
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch08-02-strings.html)
-
-{{ playground_link "strings/strings1.rs" }}
-{{ playground_link "strings/strings2.rs" }}
-{{ playground_link "strings/strings3.rs" }}
-
-### Move semantics
-
-These exercises are adapted from [pnkfelix]()'s [Rust
-Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- thank you Felix!!!
-
-Relevant chapters in the book:
-
-- [Ownership](https://doc.rust-lang.org/book/second-edition/ch04-01-what-is-ownership.html)
-- [References and borrowing](https://doc.rust-lang.org/book/second-edition/ch04-02-references-and-borrowing.html)
-
-Note that the exercises in this section may look similar to each other but they are subtly
-different :)
-
-{{ playground_link "move_semantics/move_semantics1.rs" }}
-{{ playground_link "move_semantics/move_semantics2.rs" }}
-{{ playground_link "move_semantics/move_semantics3.rs" }}
-{{ playground_link "move_semantics/move_semantics4.rs" }}
-
-### Modules
-
-[Relevant chapter in The Rust Programming
-Language](https://doc.rust-lang.org/book/second-edition/ch07-01-mod-and-the-filesystem.html)
-
-{{ playground_link "modules/modules1.rs" }}
-{{ playground_link "modules/modules2.rs" }}
-
-### Macros
-
-Check out:
-
-- [The Macros section of the first edition of the book
-  book](https://doc.rust-lang.org/book/first-edition/macros.html)
-- [The Macros appendix of the second edition of the
-  book](https://doc.rust-lang.org/book/second-edition/appendix-04-macros.html)
-- [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html)
-
-{{ playground_link "macros/macros1.rs" }}
-{{ playground_link "macros/macros2.rs" }}
-{{ playground_link "macros/macros3.rs" }}
-{{ playground_link "macros/macros4.rs" }}
-
-### Error Handling
-
-The [Error
-Handling](https://doc.rust-lang.org/book/second-edition/ch09-02-recoverable-errors-with-result.html)
-and [Generics](https://doc.rust-lang.org/book/second-edition/ch10-01-syntax.html) sections are
-relevant.
-
-{{ playground_link "error_handling/option1.rs" }}
-{{ playground_link "error_handling/result1.rs" }}
-{{ playground_link "error_handling/errors1.rs" }}
-{{ playground_link "error_handling/errors2.rs" }}
-{{ playground_link "error_handling/errors3.rs" }}
-{{ playground_link "error_handling/errorsn.rs" }}
-
-### Standard library types
-
-#### `Arc`
-
-The [Concurrency](https://doc.rust-lang.org/book/second-edition/ch16-03-shared-state.html) section
-is relevant.
-
-{{ playground_link "standard_library_types/arc1.rs" }}
-
-#### Iterators
-
-Do not adjust your monitors-- iterators 1 and 2 are indeed missing. Iterator 3 is a bit challenging
-so we're leaving space for some exercises to lead up to it!
-
-Check out the [Iterators chapter of the
-book](https://doc.rust-lang.org/book/second-edition/ch13-02-iterators.html) and the [Iterator
-docs](https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html).
-
-{{ playground_link "standard_library_types/iterator3.rs" }}
-{{ playground_link "standard_library_types/iterators4.rs" }}
-
-### Threads
-
-See [the Dining Philosophers
-example](https://doc.rust-lang.org/1.4.0/book/first-edition/dining-philosophers.html) and the
-[Concurrency Chapter](https://doc.rust-lang.org/book/second-edition/ch16-01-threads.html) from the
-book.
-
-{{ playground_link "threads/threads1.rs" }}
-
-### Uncategorized
-
-A few exercises based on things I've encountered or had trouble with getting used to.
-
-{{ playground_link "ex1.rs" }}
-{{ playground_link "ex2.rs" }}
-{{ playground_link "ex3.rs" }}
-{{ playground_link "ex4.rs" }}
-{{ playground_link "ex5.rs" }}
-
-## To help with this repo/TODO list
-
-* File issues for problems or suggestions!
-* Contribute more exercises! Anything that took you time to get used to, or that you had trouble
-  with, or that deserves practice would be a good exercise!
-* How could the process of doing these exercises work better? This is an open-ended question :) Are
-  the playground links good enough? Are there ways that we could make going to the next exercise
-  easier without forking the playground??

old_curriculum/primitive_types/primitive_types5.rs

@@ -1,45 +0,0 @@
-// primitive_types5.rs
-// Destructure the `cat` tuple so that the println will work.
-// Scroll down for hints!
-
-fn main() {
-    let cat = ("Furry McFurson", 3.5);
-    let /* your pattern here */ = cat;
-
-    println!("{} is {} years old.", name, age);
-}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-// Take a look at the Primitive Types -> Tuples section of the book:
-// http://doc.rust-lang.org/stable/book/primitive-types.html#tuples
-// Particularly the part about "destructuring lets". You'll need to
-// make a pattern to bind `name` and `age` to the appropriate parts
-// of the tuple. You can do it!!

old_curriculum/src/bin/generate_readme.rs

@@ -1,49 +0,0 @@
-// This script reads README-template.md and generates the playground links
-// from the Rust source files in the various directories.
-
-// To add a new exercise, add it to the appropriate place in README-template.md
-// and then make sure to recompile this script (because the template gets
-// included at compile time and then run it to generate a new version of
-// README.md.
-
-extern crate handlebars;
-extern crate prlink;
-#[macro_use]
-extern crate serde_json;
-
-use handlebars::{Handlebars, Helper, RenderContext, RenderError};
-
-use std::fs::File;
-use std::io::prelude::*;
-use std::path::PathBuf;
-
-fn main() {
-    let mut template_file = File::open("README-template.hbs").unwrap();
-    let mut template = String::new();
-    template_file.read_to_string(&mut template).unwrap();
-
-    let autogenerated_notice = "This file was autogenerated by the script in src/bin/generate_readme.rs.
-Please edit either the script or the template in README-template.md in
-order to make changes here rather than committing the changes directly.";
-
-    let mut generated_readme = File::create("README.md").unwrap();
-
-    let mut hbs = Handlebars::new();
-    hbs.register_helper("playground_link", Box::new(playground_link_helper));
-
-    write!(
-        generated_readme,
-        "{}",
-        hbs.render_template(
-            &template,
-            &json!({ "autogenerated_notice": autogenerated_notice }),
-        ).unwrap()
-    ).unwrap();
-}
-
-fn playground_link_helper(h: &Helper, _: &Handlebars, rc: &mut RenderContext) -> Result<(), RenderError> {
-    let filename = PathBuf::from(h.param(0).unwrap().value().as_str().unwrap());
-    let link = prlink::linkify_file(&filename);
-    rc.writer.write(link.into_bytes().as_ref())?;
-    Ok(())
-}

src/about_variables.rs

@@ -1,38 +0,0 @@
-use helpers::*;
-
-// Variables in Rust are defined using the "let" keyword. Like this:
-
-fn exercise_one() {
-    let x = 5;
-    verify(5, x);
-    //      ^  ^
-    //      |  |
-    // What's  The variable
-    //  in it  name
-}
-
-// Try to replace the "0" with the value of the variable, then run
-// "cargo run" and see if it was correct!
-
-// Here's a more complicated example:
-
-fn guess_me() -> &'static str {
-    let x = 10;
-    if x == 10 {
-        return "Ten!";
-    } else {
-        return "Not ten!";
-    }
-}
-
-fn exercise_two() {
-    let result = guess_me();
-    verify("REPLACE ME", result);
-}
-
-pub fn exec() {
-    title("Variables: Exercise 1");
-    exercise_one();
-    title("Variables: Exercise 2");
-    exercise_two();
-}

src/helpers.rs

@@ -1,33 +0,0 @@
-use ansi_term::Color::{Green, Red, Yellow};
-use std::fmt::Display;
-
-pub fn verify<T: PartialEq + Display>(left: T, right: T) {
-    if left == right {
-        println!("{} {} == {}", Green.bold().paint("PASS"), left, right);
-    } else {
-        println!(
-            "{} You submitted {}, but that's not correct!",
-            Red.bold().paint("FAIL"),
-            left
-        );
-        println!("     Please correct your code to make this test pass!");
-    }
-}
-
-pub fn verify_easy<T: PartialEq + Display>(left: T, right: T) {
-    if left == right {
-        println!("{} {} == {}", Green.bold().paint("PASS"), left, right);
-    } else {
-        println!(
-            "{} You submitted {}, but that's not correct!",
-            Red.bold().paint("FAIL"),
-            left
-        );
-        println!("     Expected: {}", right);
-        println!("     Please correct your code to make this test pass!");
-    }
-}
-
-pub fn title(s: &str) {
-    println!("{} {}", Yellow.bold().paint("RUN"), s);
-}

src/main.rs

@@ -1,21 +1,44 @@
 #[macro_use]
-extern crate quicli;
-extern crate ansi_term;
+extern crate clap;
+extern crate indicatif;
+extern crate console;
 
-use ansi_term::Color::Yellow;
-use quicli::prelude::*;
+use clap::{App, SubCommand};
+use indicatif::{ProgressBar};
+use console::{style, Emoji};
+use std::process::Command;
 
-mod helpers;
-mod about_variables;
+fn main() {
+  let matches = App::new("r2")
+      .version(crate_version!())
+      .author("Olivia Hugger")
+      .about("Test")
+      .subcommand(SubCommand::with_name("verify").alias("v"))
+      .get_matches();
   
-#[derive(Debug, StructOpt)]
-struct Cli {
-    exercise: Option<String>,
+  if let Some(_) = matches.subcommand_matches("verify") {
+    execute("exercises/ex1.rs");
+    execute("exercises/ex2.rs");
+    execute("exercises/ex3.rs");
+    execute("exercises/ex4.rs");
+    execute("exercises/ex5.rs");
+  }
 }
 
-main!(|args: Cli| if let Some(e) = args.exercise {
-    println!("selected {}", e);
-} else {
-    println!("Welcome to {}!\n", Yellow.paint("Rustlings"));
-    about_variables::exec();
-});
+fn execute(filename: &str) {
+  let bar = ProgressBar::new_spinner();
+  bar.set_message(format!("Compiling {}...", filename).as_str());
+  bar.enable_steady_tick(100);
+  let compilecmd = Command::new("rustc")
+                           .args(&[filename, "-o", "temp"])
+                           .output()
+                           .expect("fail");
+  bar.finish_and_clear();
+  if compilecmd.status.success() {
+    println!("{} Successfully compiled {}!", Emoji("✅", "✓"), style(filename).italic());
+  } else {
+    println!("{} Compilation of {} failed! Compiler error message:\n", Emoji("⚠️ ", "!"), style(filename).italic());
+    println!("{}", String::from_utf8_lossy(&compilecmd.stderr));
+    std::process::exit(1);
+  }
+}