Add command to check all the exercises

This allows for skipping repeating "next" when multiple exercises
are done at once, or when earlier exercises have been updated/changed
(and thus must be redone) while still working of the whole set (i.e.
the final check_all is not yet available to flag those undone exercises)

src/app_state.rs

@@ -396,8 +396,16 @@ impl AppState {
     }
 
     // Return the exercise index of the first pending exercise found.
-    fn check_all_exercises(&mut self, stdout: &mut StdoutLock) -> Result<Option<usize>> {
+    pub fn check_all_exercises(
-        stdout.write_all(FINAL_CHECK_MSG)?;
+        &mut self,
+        stdout: &mut StdoutLock,
+        final_check: bool,
+    ) -> Result<Option<usize>> {
+        if !final_check {
+            stdout.write_all(INTERMEDIATE_CHECK_MSG)?;
+        } else {
+            stdout.write_all(FINAL_CHECK_MSG)?;
+        }
         let n_exercises = self.exercises.len();
 
         let (mut checked_count, mut results) = thread::scope(|s| {
@@ -513,7 +521,7 @@ impl AppState {
             stdout.write_all(b"\n")?;
         }
 
-        if let Some(pending_exercise_ind) = self.check_all_exercises(stdout)? {
+        if let Some(pending_exercise_ind) = self.check_all_exercises(stdout, true)? {
             stdout.write_all(b"\n\n")?;
 
             self.current_exercise_ind = pending_exercise_ind;
@@ -525,6 +533,12 @@ impl AppState {
         // Write that the last exercise is done.
         self.write()?;
 
+        self.render_final_message(stdout)?;
+
+        Ok(ExercisesProgress::AllDone)
+    }
+
+    pub fn render_final_message(&self, stdout: &mut StdoutLock) -> Result<()> {
         clear_terminal(stdout)?;
         stdout.write_all(FENISH_LINE.as_bytes())?;
 
@@ -534,12 +548,14 @@ impl AppState {
             stdout.write_all(b"\n")?;
         }
 
-        Ok(ExercisesProgress::AllDone)
+        Ok(())
     }
 }
 
 const BAD_INDEX_ERR: &str = "The current exercise index is higher than the number of exercises";
 const STATE_FILE_HEADER: &[u8] = b"DON'T EDIT THIS FILE!\n\n";
+const INTERMEDIATE_CHECK_MSG: &[u8] = b"Checking all exercises
+";
 const FINAL_CHECK_MSG: &[u8] = b"All exercises seem to be done.
 Recompiling and running all exercises to make sure that all of them are actually done.
 ";

src/watch.rs

@@ -103,6 +103,13 @@ fn run_watch(
             WatchEvent::Input(InputEvent::Run) => watch_state.run_current_exercise(&mut stdout)?,
             WatchEvent::Input(InputEvent::Hint) => watch_state.show_hint(&mut stdout)?,
             WatchEvent::Input(InputEvent::List) => return Ok(WatchExit::List),
+            WatchEvent::Input(InputEvent::CheckAll) => match watch_state
+                .check_all_exercises(&mut stdout)?
+            {
+                ExercisesProgress::AllDone => break,
+                ExercisesProgress::NewPending => watch_state.run_current_exercise(&mut stdout)?,
+                ExercisesProgress::CurrentPending => (),
+            },
             WatchEvent::Input(InputEvent::Reset) => watch_state.reset_exercise(&mut stdout)?,
             WatchEvent::Input(InputEvent::Quit) => {
                 stdout.write_all(QUIT_MSG)?;

src/watch/state.rs

@@ -195,6 +195,11 @@ impl<'a> WatchState<'a> {
         stdout.queue(ResetColor)?;
         stdout.write_all(b":list / ")?;
 
+        stdout.queue(SetAttribute(Attribute::Bold))?;
+        stdout.write_all(b"c")?;
+        stdout.queue(ResetColor)?;
+        stdout.write_all(b":check all / ")?;
+
         stdout.queue(SetAttribute(Attribute::Bold))?;
         stdout.write_all(b"x")?;
         stdout.queue(ResetColor)?;
@@ -274,6 +279,23 @@ impl<'a> WatchState<'a> {
         Ok(())
     }
 
+    pub fn check_all_exercises(&mut self, stdout: &mut StdoutLock) -> Result<ExercisesProgress> {
+        stdout.write_all(b"\n")?;
+
+        if let Some(first_fail) = self.app_state.check_all_exercises(stdout, false)? {
+            // Only change exercise if the current one is done...
+            if self.app_state.current_exercise().done {
+                self.app_state.set_current_exercise_ind(first_fail)?;
+            }
+            // ...but always pretend it's a "new" anyway because that refreshes
+            // the display
+            Ok(ExercisesProgress::NewPending)
+        } else {
+            self.app_state.render_final_message(stdout)?;
+            Ok(ExercisesProgress::AllDone)
+        }
+    }
+
     pub fn update_term_width(&mut self, width: u16, stdout: &mut StdoutLock) -> io::Result<()> {
         if self.term_width != width {
             self.term_width = width;

src/watch/terminal_event.rs

@@ -11,6 +11,7 @@ pub enum InputEvent {
     Run,
     Hint,
     List,
+    CheckAll,
     Reset,
     Quit,
 }
@@ -37,6 +38,7 @@ pub fn terminal_event_handler(
                     KeyCode::Char('r') if manual_run => InputEvent::Run,
                     KeyCode::Char('h') => InputEvent::Hint,
                     KeyCode::Char('l') => break WatchEvent::Input(InputEvent::List),
+                    KeyCode::Char('c') => InputEvent::CheckAll,
                     KeyCode::Char('x') => {
                         if sender.send(WatchEvent::Input(InputEvent::Reset)).is_err() {
                             return;