Auto merge of #231 - rust-lang:refactor-hints, r=jrvidal

Refactor hints

Breaking change. This removes hints from the end of files, and puts them into `info.toml`. You can now access hints using:

```
rustlings hint <exerciseName>
```

ALSO this changes the exercise system to index by name for `run` and `hint`, so:

```
rustlings run exercises/if/if1.rs
```

becomes

```
rustlings run if1
```

3 files changed, 25 insertions, 6 deletions

diff --git a/tests/fixture/failure/info.toml b/tests/fixture/failure/info.toml
index f4e7c0c..e5949f9 100644
--- a/tests/fixture/failure/info.toml
+++ b/tests/fixture/failure/info.toml
@@ -1,7 +1,11 @@
 [[exercises]]
+name = "compFailure"
 path = "compFailure.rs"
 mode = "compile"
+hint = ""
 
 [[exercises]]
+name = "testFailure"
 path = "testFailure.rs"
-mode = "test"
\ No newline at end of file
+mode = "test"
+hint = "Hello!"
diff --git a/tests/fixture/success/info.toml b/tests/fixture/success/info.toml
index e255db9..68d3538 100644
--- a/tests/fixture/success/info.toml
+++ b/tests/fixture/success/info.toml
@@ -1,7 +1,11 @@
 [[exercises]]
+name = "compSuccess"
 path = "compSuccess.rs"
 mode = "compile"
+hint = """"""
 
 [[exercises]]
+name = "testSuccess"
 path = "testSuccess.rs"
-mode = "test"
\ No newline at end of file
+mode = "test"
+hint = """"""
diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
index 897cd2a..754aa63 100644
--- a/tests/integration_tests.rs
+++ b/tests/integration_tests.rs
@@ -43,7 +43,7 @@ fn verify_all_failure() {
 fn run_single_compile_success() {
     Command::cargo_bin("rustlings")
         .unwrap()
-        .args(&["r", "compSuccess.rs"])
+        .args(&["r", "compSuccess"])
         .current_dir("tests/fixture/success/")
         .assert()
         .success();
@@ -53,7 +53,7 @@ fn run_single_compile_success() {
 fn run_single_compile_failure() {
     Command::cargo_bin("rustlings")
         .unwrap()
-        .args(&["r", "compFailure.rs"])
+        .args(&["r", "compFailure"])
         .current_dir("tests/fixture/failure/")
         .assert()
         .code(1);
@@ -63,7 +63,7 @@ fn run_single_compile_failure() {
 fn run_single_test_success() {
     Command::cargo_bin("rustlings")
         .unwrap()
-        .args(&["r", "testSuccess.rs"])
+        .args(&["r", "testSuccess"])
         .current_dir("tests/fixture/success/")
         .assert()
         .success();
@@ -73,7 +73,7 @@ fn run_single_test_success() {
 fn run_single_test_failure() {
     Command::cargo_bin("rustlings")
         .unwrap()
-        .args(&["r", "testFailure.rs"])
+        .args(&["r", "testFailure"])
         .current_dir("tests/fixture/failure/")
         .assert()
         .code(1);
@@ -110,6 +110,17 @@ fn run_single_test_no_exercise() {
 }
 
 #[test]
+fn get_hint_for_single_test() {
+    Command::cargo_bin("rustlings")
+        .unwrap()
+        .args(&["h", "testFailure"])
+        .current_dir("tests/fixture/failure")
+        .assert()
+        .code(0)
+        .stdout("Hello!\n");
+}
+
+#[test]
 fn all_exercises_require_confirmation() {
     for exercise in glob("exercises/**/*.rs").unwrap() {
         let path = exercise.unwrap();