feat: improve watch execution mode

The `watch` command now requires user action to move to the next
exercise.

BREAKING CHANGE: this changes the behavior of `watch`.

src/verify.rs

@@ -1,18 +1,21 @@
-use crate::exercise::{Exercise, Mode};
+use crate::exercise::{ContextLine, Exercise, Mode, State};
 use console::{style, Emoji};
 use indicatif::ProgressBar;
 
 pub fn verify<'a>(start_at: impl IntoIterator<Item = &'a Exercise>) -> Result<(), ()> {
     for exercise in start_at {
-        match exercise.mode {
+        let is_done = match exercise.mode {
             Mode::Test => test(&exercise)?,
             Mode::Compile => compile_only(&exercise)?,
+        };
+        if !is_done {
+            return Err(());
         }
     }
     Ok(())
 }
 
-fn compile_only(exercise: &Exercise) -> Result<(), ()> {
+fn compile_only(exercise: &Exercise) -> Result<bool, ()> {
     let progress_bar = ProgressBar::new_spinner();
     progress_bar.set_message(format!("Compiling {}...", exercise).as_str());
     progress_bar.enable_steady_tick(100);
@@ -22,7 +25,12 @@ fn compile_only(exercise: &Exercise) -> Result<(), ()> {
         let formatstr = format!("{} Successfully compiled {}!", Emoji("✅", "✓"), exercise);
         println!("{}", style(formatstr).green());
         exercise.clean();
-        Ok(())
+        if let State::Pending(context) = exercise.state() {
+            print_everything_looks_good(exercise.mode, context);
+            Ok(false)
+        } else {
+            Ok(true)
+        }
     } else {
         let formatstr = format!(
             "{} Compilation of {} failed! Compiler error message:\n",
@@ -36,7 +44,7 @@ fn compile_only(exercise: &Exercise) -> Result<(), ()> {
     }
 }
 
-pub fn test(exercise: &Exercise) -> Result<(), ()> {
+pub fn test(exercise: &Exercise) -> Result<bool, ()> {
     let progress_bar = ProgressBar::new_spinner();
     progress_bar.set_message(format!("Testing {}...", exercise).as_str());
     progress_bar.enable_steady_tick(100);
@@ -52,7 +60,12 @@ pub fn test(exercise: &Exercise) -> Result<(), ()> {
             let formatstr = format!("{} Successfully tested {}!", Emoji("✅", "✓"), exercise);
             println!("{}", style(formatstr).green());
             exercise.clean();
-            Ok(())
+            if let State::Pending(context) = exercise.state() {
+                print_everything_looks_good(exercise.mode, context);
+                Ok(false)
+            } else {
+                Ok(true)
+            }
         } else {
             let formatstr = format!(
                 "{} Testing of {} failed! Please try again. Here's the output:",
@@ -77,3 +90,34 @@ pub fn test(exercise: &Exercise) -> Result<(), ()> {
         Err(())
     }
 }
+
+fn print_everything_looks_good(mode: Mode, context: Vec<ContextLine>) {
+    let success_msg = match mode {
+        Mode::Compile => "The code is compiling!",
+        Mode::Test => "The code is compiling, and the tests pass!",
+    };
+
+    println!("");
+    println!("🎉 🎉  {} 🎉 🎉", success_msg);
+    println!("");
+    println!("You can keep working on this exercise,");
+    println!(
+        "or jump into the next one by removing the {} comment:",
+        style("`I AM NOT DONE`").bold()
+    );
+    println!("");
+    for context_line in context {
+        let formatted_line = if context_line.important {
+            format!("{}", style(context_line.line).bold())
+        } else {
+            format!("{}", context_line.line)
+        };
+
+        println!(
+            "{:>2} {}  {}",
+            style(context_line.number).blue().bold(),
+            style("|").blue(),
+            formatted_line
+        );
+    }
+}