add pedantic clippy setting and fix/allow warnings (#147)

crates/djls-project/Cargo.toml

@@ -19,3 +19,6 @@ djls-dev = { workspace = true }
 
 [dev-dependencies]
 tempfile = { workspace = true }
+
+[lints]
+workspace = true

crates/djls-project/src/lib.rs

@@ -23,6 +23,7 @@ pub struct DjangoProject {
 }
 
 impl DjangoProject {
+    #[must_use]
     pub fn new(path: PathBuf) -> Self {
         Self {
             path,
@@ -64,17 +65,19 @@ impl DjangoProject {
                     Ok(())
                 }
                 Err(e) => {
-                    eprintln!("Failed to import Django: {}", e);
+                    eprintln!("Failed to import Django: {e}");
                     Err(e)
                 }
             }
         })
     }
 
+    #[must_use]
     pub fn template_tags(&self) -> Option<&TemplateTags> {
         self.template_tags.as_ref()
     }
 
+    #[must_use]
     pub fn path(&self) -> &Path {
         &self.path
     }
@@ -84,7 +87,7 @@ impl fmt::Display for DjangoProject {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         writeln!(f, "Project path: {}", self.path.display())?;
         if let Some(py_env) = &self.env {
-            write!(f, "{}", py_env)?;
+            write!(f, "{py_env}")?;
         }
         Ok(())
     }
@@ -141,7 +144,7 @@ mod tests {
 
         let project = DjangoProject::new(project_path.clone());
 
-        let display_str = format!("{}", project);
+        let display_str = format!("{project}");
         assert!(display_str.contains(&format!("Project path: {}", project_path.display())));
     }
 }

crates/djls-project/src/python.rs

@@ -96,9 +96,8 @@ impl PythonEnvironment {
     }
 
     fn from_system_python() -> Option<Self> {
-        let python_path = match system::find_executable("python") {
-            Ok(p) => p,
-            Err(_) => return None,
+        let Ok(python_path) = system::find_executable("python") else {
+            return None;
         };
         let bin_dir = python_path.parent()?;
         let prefix = bin_dir.parent()?;

crates/djls-project/src/templatetags.rs

@@ -35,7 +35,7 @@ impl TemplateTags {
             let library_name = if module_name.is_empty() {
                 "builtins".to_string()
             } else {
-                module_name.split('.').last().unwrap_or("").to_string()
+                module_name.split('.').next_back().unwrap_or("").to_string()
             };
 
             tags.push(TemplateTag::new(tag_name, library_name, doc));
@@ -90,7 +90,7 @@ impl TemplateTag {
         &self.library
     }
 
-    pub fn doc(&self) -> &Option<String> {
-        &self.doc
+    pub fn doc(&self) -> Option<&String> {
+        self.doc.as_ref()
     }
 }