feat: warn if no validators on build

crates/aiken-project/src/error.rs

@@ -393,7 +393,9 @@ impl Diagnostic for Error {
 
 #[derive(thiserror::Error)]
 pub enum Warning {
-    #[error("Checking")]
+    #[error("You do not have any validators to build!")]
+    NoValidators,
+    #[error("While trying to make sense of your code...")]
     Type {
         path: PathBuf,
         src: String,
@@ -411,17 +413,21 @@ impl Diagnostic for Warning {
     fn source_code(&self) -> Option<&dyn SourceCode> {
         match self {
             Warning::Type { named, .. } => Some(named),
+            Warning::NoValidators => None,
         }
     }
+
     fn labels(&self) -> Option<Box<dyn Iterator<Item = LabeledSpan> + '_>> {
         match self {
             Warning::Type { warning, .. } => warning.labels(),
+            Warning::NoValidators => None,
         }
     }
 
     fn code<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
         match self {
             Warning::Type { .. } => Some(Box::new("aiken::check")),
+            Warning::NoValidators => Some(Box::new("aiken::check")),
         }
     }
 }

crates/aiken-project/src/lib.rs

@@ -107,6 +107,8 @@ where
     }
 
     pub fn docs(&mut self, destination: Option<PathBuf>) -> Result<(), Error> {
+        self.compile_deps()?;
+
         self.event_listener
             .handle_event(Event::BuildingDocumentation {
                 root: self.root.clone(),
@@ -399,7 +401,7 @@ where
         Ok(())
     }
 
-    fn validate_validators(&self) -> Result<Vec<(PathBuf, String, TypedFunction)>, Error> {
+    fn validate_validators(&mut self) -> Result<Vec<(PathBuf, String, TypedFunction)>, Error> {
         let mut errors = Vec::new();
         let mut validators = Vec::new();
 
@@ -462,6 +464,10 @@ where
             }
         }
 
+        if validators.is_empty() {
+            self.warnings.push(Warning::NoValidators);
+        }
+
         if errors.is_empty() {
             Ok(validators)
         } else {