Merge pull request #106 from rustlings/new

rustlings v2

.gitignore

@@ -1,2 +1,5 @@
 *.swp
 target/
+**/*.rs.bk
+Cargo.lock
+.DS_Store

.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
-

Cargo.toml

@@ -1,9 +1,12 @@
 [package]
 name = "rustlings"
 version = "0.1.0"
-authors = ["Carol (Nichols || Goulding) <carol.nichols@gmail.com>"]
+authors = ["olivia <819880950@qq.com>", "Carol (Nichols || Goulding) <carol.nichols@gmail.com"]
+edition = "2018"
 
 [dependencies]
-handlebars = "0.32.0"
+clap = "2.32.0"
-serde_json = "1.0.10"
+indicatif = "0.9.0"
-prlink = { git = "https://github.com/btbytes/prlink" }
+console = "0.6.2"
+syntect = "3.0.2"
+notify = "4.0.0"

README-template.hbs

@@ -1,191 +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/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" }}
-{{ playground_link "ex6.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??

default_out.md

@@ -0,0 +1,20 @@
+Thanks for installing `rustlings`!
+
+## Is this your first time?
+
+Let's make sure you're up to speed:
+- You have Rust installed, preferably via `rustup`
+- You have `~/.cargo/bin` added to your PATH variable
+- You have cloned this repository (https://github.com/rustlings/rustlings)
+- You have installed Rust language support for your editor
+- You have locally installed the `rustlings` command by running:
+
+```sh
+cargo install --path .
+```
+
+If you've done all of this (or even most of it), congrats! You're ready
+to start working with Rust.
+
+To get started, run `rustlings verify` in order to get the first exercise.
+Make sure to have your editor open!

ex1.rs

@@ -1,6 +0,0 @@
-// ex1.rs
-// Make me compile! :)
-
-fn main() {
-    println();
-}

ex2.rs

@@ -1,10 +0,0 @@
-// ex2.rs
-// Make me compile!
-
-fn something() -> String {
-    "hi!"
-}
-
-fn main() {
-    println!("{}", something());
-}

ex3.rs

@@ -1,10 +0,0 @@
-// ex3.rs
-// Make me compile!
-
-struct Foo {
-    capacity: i32,
-}
-
-fn main() {
-    println!("{:?}", Foo { capacity: 3 });
-}

ex4.rs

@@ -1,14 +0,0 @@
-// ex4.rs
-// Make me compile!
-
-fn something() -> Result<i32, std::num::ParseIntError> {
-    let x:i32 = "3".parse();
-    Ok(x * 4)
-}
-
-fn main() {
-    match something() {
-        Ok(..) => println!("You win!"),
-        Err(e) => println!("Oh no something went wrong: {}", e),
-    }
-}

ex5.rs

@@ -1,22 +0,0 @@
-// ex5.rs
-// Make me compile!
-
-enum Reaction<'a> {
-    Sad(&'a str),
-    Happy(&'a str),
-}
-
-fn express(sentiment: Reaction) {
-    match sentiment {
-        Reaction::Sad(s) => println!(":( {}", s),
-        Reaction::Happy(s) => println!(":) {}", s),
-    }
-}
-
-fn main () {
-    let x = Reaction::Happy("It's a great day for Rust!");
-    express(x);
-    express(x);
-    let y = Reaction::Sad("This code doesn't compile yet.");
-    express(y);
-}

ex6.rs

@@ -1,47 +0,0 @@
-// ex6.rs
-// Make me compile! Scroll down for hints :)
-
-fn main() {
-    let robot_name = Some(String::from("Bors"));
-
-    match robot_name {
-        Some(name) => println!("Found a name: {}", name),
-        None => (),
-    }
-
-    println!("robot_name is: {:?}", robot_name);
-}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-// Hint: The following two statements are equivalent:
-// let x = &y;
-// let ref x = y;

exercises/error_handling/README.md

@@ -0,0 +1,5 @@
+For this exercise check out the sections:
+- [Error Handling](https://doc.rust-lang.org/book/2018-edition/ch09-02-recoverable-errors-with-result.html) 
+- [Generics](https://doc.rust-lang.org/book/2018-edition/ch10-01-syntax.html) 
+
+of the Rust Book.

exercises/functions/REAMDE.md

@@ -0,0 +1,7 @@
+### Functions
+
+Here, you'll learn how to write functions and how Rust's compiler can trace things way back.
+
+#### Book Sections
+
+- [How Functions Work](https://doc.rust-lang.org/stable/book/ch03-03-how-functions-work.html)

exercises/if/README.md

@@ -0,0 +1,7 @@
+### If
+
+`if`, the most basic type of control flow, is what you'll learn here.
+
+#### Book Sections
+
+- [Control Flow - if expressions](https://doc.rust-lang.org/stable/book/ch03-05-control-flow.html#if-expressions)

exercises/if/if1.rs

@@ -9,6 +9,7 @@ pub fn bigger(a: i32, b:i32) -> i32 {
     // Scroll down for hints.
 }
 
+// Don't mind this for now :)
 #[cfg(test)]
 mod tests {
     use super::*;

exercises/macros/README.md

@@ -0,0 +1,10 @@
+### Macros
+
+Rust's macro system is very powerful, but also kind of difficult to wrap your
+head around. We're not going to teach you how to write your own fully-featured
+modules, instead we'll show you how to use and create them.
+
+#### Book Sections
+
+- [Macros](https://doc.rust-lang.org/stable/book/ch19-06-macros.html)
+- [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html)

exercises/modules/README.md

@@ -0,0 +1,7 @@
+### Modules
+
+In this section we'll give you an introduction to Rust's module system.
+
+#### Book Sections
+
+- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-modules-and-use-to-control-scope-and-privacy.html)

exercises/modules/modules2.rs

@@ -0,0 +1,45 @@
+// modules2.rs
+// Make me compile! Scroll down for hints :)
+
+mod delicious_snacks { 
+    use self::fruits::PEAR as fruit;
+    use self::veggies::CUCUMBER as veggie;
+
+    mod fruits {
+        pub const PEAR: &'static str = "Pear";
+        pub const APPLE: &'static str = "Apple";
+    }
+
+    mod veggies {
+        pub const CUCUMBER: &'static str = "Cucumber";
+        pub const CARROT: &'static str = "Carrot";
+    }
+}
+
+fn main() {
+    println!("favorite snacks: {} and {}",
+             delicious_snacks::fruit,
+             delicious_snacks::veggie);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+// The delicious_snacks module is trying to present an external
+// interface (the `fruit` and `veggie` constants) that is different than
+// its internal structure (the `fruits` and `veggies` modules and
+// associated constants). It's almost there except for one keyword missing for
+// each constant.

exercises/move_semantics/README.md

@@ -0,0 +1,10 @@
+### Move Semantics
+
+These exercises are adapted from [pnkfelix](https://github.com/pnkfelix)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
+
+#### Book Sections
+
+For this section, the book links are especially important.
+
+- [Ownership](https://doc.rust-lang.org/stable/book/ch04-01-what-is-ownership.html)
+- [Reference and borrowing](https://doc.rust-lang.org/stable/book/ch04-02-references-and-borrowing.html)

exercises/primitive_types/README.md

@@ -0,0 +1,8 @@
+### Primitive Types
+
+Rust has a couple of basic types that are directly implemented into the
+compiler. In this section, we'll go through the most important ones.
+
+#### Book Sections
+
+- [Data Types](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html)

exercises/primitive_types/primitive_types4.rs

@@ -39,11 +39,11 @@ fn main() {
 
 
 // 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
+// https://doc.rust-lang.org/book/ch04-03-slices.html
 // 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 section of the book:
-// https://doc.rust-lang.org/stable/book/second-edition/ch15-02-deref.html#implicit-deref-coercions-with-functions-and-methods
+// https://doc.rust-lang.org/book/ch15-02-deref.html

exercises/primitive_types/primitive_types5.rs

@@ -39,7 +39,7 @@ fn main() {
 
 
 // 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
+// https://doc.rust-lang.org/stable/book/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

@@ -41,5 +41,5 @@ fn main() {
 // While you could use a destructuring `let` for the tuple here, try 
 // 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
+// https://doc.rust-lang.org/stable/book/ch03-02-data-types.html#the-tuple-type
 // Now you have another tool in your toolbox!

exercises/standard_library_types/README.md

@@ -0,0 +1,5 @@
+For the Arc exercise check out the chapter [Shared-State Concurrency](https://doc.rust-lang.org/book/2018-edition/ch16-03-shared-state.html) of the Rust Book.
+
+For the Iterator exercise check out the chapters [Iterator](https://doc.rust-lang.org/book/2018-edition/ch13-02-iterators.html) of the Rust Book and the [Iterator documentation](https://doc.rust-lang.org/stable/std/iter/trait.Iterator.htmlj).
+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!
+

exercises/strings/REAMDE.md

@@ -0,0 +1,9 @@
+### Strings
+
+Rust has two string types, a string slice (`&str`) and an owned string (`String`).
+We're not going to dictate when you should use which one, but we'll show you how
+to identify and create them, as well as use them.
+
+#### Book Sections
+
+- [Strings](https://doc.rust-lang.org/stable/book/ch08-02-strings.html)

exercises/test1.rs

@@ -0,0 +1,20 @@
+// test1.rs
+// This is a test for the following sections:
+// - Variables
+// - Functions
+
+// Mary is buying apples. One apple usually costs 2 dollars, but if you buy
+// more than 40 at once, each apple only costs 1! Write a function that calculates
+// the price of an order of apples given the order amount.
+
+fn main() {
+    let price1 = calculateprice(55);
+    let price2 = calculateprice(40);
+
+    // Don't modify this!
+    if price1 == 55 && price2 == 80 {
+        println!("Good job!");
+    } else {
+        panic!("Uh oh! Wrong price!");
+    }
+}

exercises/test2.rs

@@ -1,4 +1,7 @@
-// tests4.rs
+// test2.rs
+// This is a test for the following sections:
+// - Tests
+
 // This test isn't testing our function -- make it do that in such a way that
 // the test passes. Then write a second test that tests that we get the result
 // we expect to get when we call `times_two` with a negative number.

exercises/test3.rs

@@ -1,4 +1,7 @@
 // strings3.rs
+// This is a test for the following sections:
+// - Strings
+
 // Ok, here are a bunch of values-- some are `Strings`, some are `&strs`. Your
 // task is to call one of these two functions on each value depending on what
 // you think each value is. That is, add either `string_slice` or `string`

exercises/test4.rs

@@ -0,0 +1,12 @@
+// test4.rs
+// This test covers the sections:
+// - Modules
+// - Macros
+
+// Write a macro that passes the test! No hints this time, you can do it!
+
+fn main() {
+    if my_macro!("world!") != "Hello world!" {
+        panic!("Oh no! Wrong output!");
+    }
+}

exercises/tests/README.md

@@ -0,0 +1,7 @@
+### Tests
+
+Going out of order from the book to cover tests -- many of the following exercises will ask you to make tests pass!
+
+#### Book Sections
+
+- [Writing Tests](https://doc.rust-lang.org/stable/book/ch11-01-writing-tests.html)

exercises/tests/tests1.rs

@@ -1,7 +1,7 @@
 // tests1.rs
 // Tests are important to ensure that your code does what you think it should do.
 // Tests can be run on this file with the following command:
-// rustc --test tests1.rs
+// rustlings run --test exercises/tests/tests1.rs
 
 // This test has a problem with it -- make the test compile! Make the test
 // pass! Make the test fail! Scroll down for hints :)

exercises/tests/tests3.rs

@@ -1,6 +1,6 @@
 // tests3.rs
 // This test isn't testing our function -- make it do that in such a way that
-// the test passes. Then write a second test that tests that we get the result
+// the test passes. Then write a second test that tests whether we get the result
 // we expect to get when we call `is_even(5)`. Scroll down for hints!
 
 pub fn is_even(num: i32) -> bool {
@@ -13,7 +13,7 @@ mod tests {
 
     #[test]
     fn is_true_when_even() {
-        assert!(false);
+        assert!();
     }
 }
 

exercises/threads/README.md

@@ -0,0 +1 @@
+For this exercise check out the [Dining Philosophers example](https://doc.rust-lang.org/1.4.0/book/dining-philosophers.html) and the chapter [Concurrency](https://doc.rust-lang.org/book/2018-edition/ch16-01-threads.html) of the Rust Book.

exercises/variables/README.md

@@ -0,0 +1,7 @@
+### Variables
+
+Here you'll learn about simple variables.
+
+#### Book Sections
+
+- [Variables and Mutability](https://doc.rust-lang.org/stable/book/ch03-01-variables-and-mutability.html)

modules/modules2.rs

@@ -1,45 +0,0 @@
-// modules2.rs
-// Make me compile! Scroll down for hints :)
-
-mod us_presidential_frontrunners {
-    use self::democrats::HILLARY_CLINTON as democrat;
-    use self::republicans::DONALD_TRUMP as republican;
-
-    mod democrats {
-        pub const HILLARY_CLINTON: &'static str = "Hillary Clinton";
-        pub const BERNIE_SANDERS: &'static str = "Bernie Sanders";
-    }
-
-    mod republicans {
-        pub const DONALD_TRUMP: &'static str = "Donald Trump";
-        pub const JEB_BUSH: &'static str = "Jeb Bush";
-    }
-}
-
-fn main() {
-    println!("candidates: {} and {}",
-             us_presidential_frontrunners::democrat,
-             us_presidential_frontrunners::republican);
-}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-// The us_presidential_frontrunners module is trying to present an external
-// interface (the `democrat` and `republican` constants) that is different than
-// its internal structure (the `democrats` and `republicans` modules and
-// associated constants). It's almost there except for one keyword missing for
-// each constant.

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/main.rs

@@ -0,0 +1,96 @@
+use crate::run::run;
+use crate::verify::verify;
+use clap::{crate_version, App, Arg, SubCommand};
+use notify::DebouncedEvent;
+use notify::{RecommendedWatcher, RecursiveMode, Watcher};
+use std::io::BufRead;
+use std::sync::mpsc::channel;
+use std::time::Duration;
+use syntect::easy::HighlightFile;
+use syntect::highlighting::{Style, ThemeSet};
+use syntect::parsing::SyntaxSet;
+use syntect::util::as_24_bit_terminal_escaped;
+
+mod run;
+mod util;
+mod verify;
+
+fn main() {
+    let matches = App::new("rustlings")
+        .version(crate_version!())
+        .author("Olivia Hugger, Carol Nichols")
+        .about("Rustlings is a collection of small exercises to get you used to writing and reading Rust code")
+        .subcommand(SubCommand::with_name("verify").alias("v").about("Verifies all exercises according to the recommended order"))
+        .subcommand(SubCommand::with_name("watch").alias("w").about("Reruns `verify` when files were edited"))
+        .subcommand(
+            SubCommand::with_name("run")
+                .alias("r")
+                .about("Runs/Tests a single exercise")
+                .arg(Arg::with_name("file").required(true).index(1))
+                .arg(Arg::with_name("test").short("t").long("test").help("Run the file as a test")),
+        )
+        .get_matches();
+
+    let ss = SyntaxSet::load_defaults_newlines();
+    let ts = ThemeSet::load_defaults();
+
+    if None == matches.subcommand_name() {
+        println!("");
+        println!(r#"       welcome to...                      "#);
+        println!(r#"                 _   _ _                  "#);
+        println!(r#"  _ __ _   _ ___| |_| (_)_ __   __ _ ___  "#);
+        println!(r#" | '__| | | / __| __| | | '_ \ / _` / __| "#);
+        println!(r#" | |  | |_| \__ \ |_| | | | | | (_| \__ \ "#);
+        println!(r#" |_|   \__,_|___/\__|_|_|_| |_|\__, |___/ "#);
+        println!(r#"                               |___/      "#);
+        println!("");
+    }
+
+    if let Some(matches) = matches.subcommand_matches("run") {
+        run(matches.clone());
+    }
+
+    if let Some(_) = matches.subcommand_matches("verify") {
+        match verify() {
+            Ok(_) => {}
+            Err(_) => std::process::exit(1),
+        }
+    }
+
+    if let Some(_) = matches.subcommand_matches("watch") {
+        watch().unwrap();
+    }
+
+    if let None = matches.subcommand_name() {
+        let mut highlighter =
+            HighlightFile::new("default_out.md", &ss, &ts.themes["base16-eighties.dark"]).unwrap();
+        for maybe_line in highlighter.reader.lines() {
+            let line = maybe_line.unwrap();
+            let regions: Vec<(Style, &str)> = highlighter.highlight_lines.highlight(&line, &ss);
+            println!("{}", as_24_bit_terminal_escaped(&regions[..], true));
+        }
+    }
+
+    println!("\x1b[0m");
+}
+
+fn watch() -> notify::Result<()> {
+    let (tx, rx) = channel();
+
+    let mut watcher: RecommendedWatcher = Watcher::new(tx, Duration::from_secs(2))?;
+    watcher.watch("./exercises", RecursiveMode::Recursive)?;
+
+    let _ignored = verify();
+
+    loop {
+        match rx.recv() {
+            Ok(event) => match event {
+                DebouncedEvent::Chmod(_) | DebouncedEvent::Write(_) => {
+                    let _ignored = verify();
+                }
+                _ => {}
+            },
+            Err(e) => println!("watch error: {:?}", e),
+        }
+    }
+}

src/run.rs

@@ -0,0 +1,55 @@
+use crate::util::clean;
+use crate::verify::test;
+use console::{style, Emoji};
+use indicatif::ProgressBar;
+use std::process::Command;
+
+pub fn run(matches: clap::ArgMatches) {
+    if let Some(filename) = matches.value_of("file") {
+        if matches.is_present("test") {
+            match test(filename) {
+                Ok(_) => (),
+                Err(_) => (),
+            }
+            std::process::exit(0);
+        }
+        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.set_message(format!("Running {}...", filename).as_str());
+        if compilecmd.status.success() {
+            let runcmd = Command::new("./temp").output().expect("fail");
+            bar.finish_and_clear();
+
+            if runcmd.status.success() {
+                println!("{}", String::from_utf8_lossy(&runcmd.stdout));
+                let formatstr = format!("{} Successfully ran {}", Emoji("✅", "✓"), filename);
+                println!("{}", style(formatstr).green());
+                clean();
+            } else {
+                println!("{}", String::from_utf8_lossy(&runcmd.stdout));
+                println!("{}", String::from_utf8_lossy(&runcmd.stderr));
+
+                let formatstr = format!("{} Ran {} with errors", Emoji("⚠️ ", "!"), filename);
+                println!("{}", style(formatstr).red());
+                clean();
+            }
+        } else {
+            bar.finish_and_clear();
+            let formatstr = format!(
+                "{} Compilation of {} failed! Compiler error message:\n",
+                Emoji("⚠️ ", "!"),
+                filename
+            );
+            println!("{}", style(formatstr).red());
+            println!("{}", String::from_utf8_lossy(&compilecmd.stderr));
+            clean();
+        }
+    } else {
+        panic!("Please supply a filename!");
+    }
+}

src/util.rs

@@ -0,0 +1,5 @@
+use std::fs::remove_file;
+
+pub fn clean() {
+    let _ignored = remove_file("temp");
+}

src/verify.rs

@@ -0,0 +1,106 @@
+use crate::util::clean;
+use console::{style, Emoji};
+use indicatif::ProgressBar;
+use std::process::Command;
+
+pub fn verify() -> Result<(), ()> {
+    compile_only("exercises/variables/variables1.rs")?;
+    compile_only("exercises/variables/variables2.rs")?;
+    compile_only("exercises/variables/variables3.rs")?;
+    compile_only("exercises/variables/variables4.rs")?;
+    test("exercises/if/if1.rs")?;
+    compile_only("exercises/functions/functions1.rs")?;
+    compile_only("exercises/functions/functions2.rs")?;
+    compile_only("exercises/functions/functions3.rs")?;
+    compile_only("exercises/functions/functions4.rs")?;
+    compile_only("exercises/functions/functions5.rs")?;
+    compile_only("exercises/test1.rs")?;
+    compile_only("exercises/primitive_types/primitive_types1.rs")?;
+    compile_only("exercises/primitive_types/primitive_types2.rs")?;
+    compile_only("exercises/primitive_types/primitive_types3.rs")?;
+    compile_only("exercises/primitive_types/primitive_types4.rs")?;
+    compile_only("exercises/primitive_types/primitive_types5.rs")?;
+    compile_only("exercises/primitive_types/primitive_types6.rs")?;
+    test("exercises/tests/tests1.rs")?;
+    test("exercises/tests/tests2.rs")?;
+    test("exercises/tests/tests3.rs")?;
+    test("exercises/test2.rs")?;
+    compile_only("exercises/strings/strings1.rs")?;
+    compile_only("exercises/strings/strings2.rs")?;
+    compile_only("exercises/test3.rs")?;
+    compile_only("exercises/modules/modules1.rs")?;
+    compile_only("exercises/modules/modules2.rs")?;
+    compile_only("exercises/macros/macros1.rs")?;
+    compile_only("exercises/macros/macros2.rs")?;
+    compile_only("exercises/macros/macros3.rs")?;
+    compile_only("exercises/macros/macros4.rs")?;
+    compile_only("exercises/test4.rs")?;
+    compile_only("exercises/move_semantics/move_semantics1.rs")?;
+    compile_only("exercises/move_semantics/move_semantics2.rs")?;
+    compile_only("exercises/move_semantics/move_semantics3.rs")?;
+    compile_only("exercises/move_semantics/move_semantics4.rs")?;
+    test("exercises/error_handling/errors1.rs")?;
+    test("exercises/error_handling/errors2.rs")?;
+    test("exercises/error_handling/errors3.rs")?;
+    test("exercises/error_handling/errorsn.rs")?;
+    compile_only("exercises/error_handling/option1.rs")?;
+    test("exercises/error_handling/result1.rs")?;
+    Ok(())
+}
+
+fn compile_only(filename: &str) -> Result<(), ()> {
+    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", "--color", "always"])
+        .output()
+        .expect("fail");
+    bar.finish_and_clear();
+    if compilecmd.status.success() {
+        let formatstr = format!(
+            "{} Successfully compiled {}!",
+            Emoji("✅", "✓"),
+            filename
+        );
+        println!("{}", style(formatstr).green());
+        clean();
+        Ok(())
+    } else {
+        let formatstr = format!(
+            "{} Compilation of {} failed! Compiler error message:\n",
+            Emoji("⚠️ ", "!"),
+            filename
+        );
+        println!("{}", style(formatstr).red());
+        println!("{}", String::from_utf8_lossy(&compilecmd.stderr));
+        clean();
+        Err(())
+    }
+}
+
+pub fn test(filename: &str) -> Result<(), ()> {
+    let bar = ProgressBar::new_spinner();
+    bar.set_message(format!("Testing {}...", filename).as_str());
+    bar.enable_steady_tick(100);
+    let testcmd = Command::new("rustc")
+        .args(&["--test", filename, "-o", "temp"])
+        .output()
+        .expect("fail");
+    bar.finish_and_clear();
+    if testcmd.status.success() {
+        let formatstr = format!("{} Successfully tested {}!", Emoji("✅", "✓"), filename);
+        println!("{}", style(formatstr).green());
+        clean();
+        Ok(())
+    } else {
+        let formatstr = format!(
+            "{} Testing of {} failed! Please try again.",
+            Emoji("⚠️ ", "!"),
+            filename
+        );
+        println!("{}", style(formatstr).red());
+        clean();
+        Err(())
+    }
+}