Cleanup code and fix clippy warnings

Signed-off-by: trivernis <trivernis@protonmail.com>

src/scripting/executor.rs

@@ -90,6 +90,7 @@ impl NuExecutor {
         add_variables_to_state(vars, &mut engine_state, &mut stack);
         let (block, main_id) = read_script_file(&self.script_path, &mut engine_state).await?;
 
+        // put everything the script defines into scope
         nu_engine::eval_block(
             &engine_state,
             &mut stack,
@@ -104,6 +105,7 @@ impl NuExecutor {
 
         // block in a different thread to be able to execute scripts in parallel
         tokio::task::spawn_blocking(move || {
+            // create a call to the main method wit the given arguments and execute it
             let call_block = create_call(main_id, args);
 
             nu_engine::eval_block(
@@ -169,6 +171,7 @@ async fn read_script_file(
     }
 }
 
+/// Parses a nu script
 fn parse_nu<'a>(
     engine_state: &'a mut EngineState,
     script: &[u8],
@@ -184,6 +187,8 @@ fn parse_nu<'a>(
     }
 }
 
+/// Creates a call nu expression with the given main block declaration ID
+/// and arguments in the form of record values
 fn create_call(decl_id: DeclId, args: Vec<RecordValue>) -> Block {
     let args = args
         .into_iter()

src/scripting/record_serializer.rs

@@ -9,10 +9,14 @@ pub struct RecordSerializer {
     list_serializer: Option<RecordListSerializer>,
     map_serializer: Option<RecordMapSerializer>,
 }
+
+#[derive(Default)]
 pub struct RecordListSerializer {
     serializer: Option<Box<RecordSerializer>>,
     entries: Vec<RecordValue>,
 }
+
+#[derive(Default)]
 pub struct RecordMapSerializer {
     serializer: Option<Box<RecordSerializer>>,
     last_key: Option<RecordValue>,
@@ -20,7 +24,7 @@ pub struct RecordMapSerializer {
 }
 
 impl RecordSerializer {
-    pub fn list_serializer<'a>(&'a mut self, cap: Option<usize>) -> &'a mut RecordListSerializer {
+    pub fn list_serializer(&mut self, cap: Option<usize>) -> &mut RecordListSerializer {
         if self.list_serializer.is_none() {
             self.list_serializer = Some(RecordListSerializer::with_capacity_opt(cap));
         }
@@ -36,13 +40,6 @@ impl RecordSerializer {
 }
 
 impl RecordListSerializer {
-    pub fn new() -> Self {
-        Self {
-            entries: Vec::new(),
-            serializer: None,
-        }
-    }
-
     pub fn with_capacity(capacity: usize) -> Self {
         Self {
             entries: Vec::with_capacity(capacity),
@@ -53,7 +50,7 @@ impl RecordListSerializer {
     pub fn with_capacity_opt(capacity: Option<usize>) -> Self {
         match capacity {
             Some(cap) => Self::with_capacity(cap),
-            None => Self::new(),
+            None => Self::default(),
         }
     }
 
@@ -66,13 +63,6 @@ impl RecordListSerializer {
 }
 
 impl RecordMapSerializer {
-    pub fn new() -> Self {
-        Self {
-            last_key: None,
-            entries: Vec::new(),
-            serializer: None,
-        }
-    }
     pub fn with_capacity(capacity: usize) -> Self {
         Self {
             last_key: None,
@@ -80,12 +70,14 @@ impl RecordMapSerializer {
             serializer: None,
         }
     }
+
     pub fn with_capacity_opt(capacity: Option<usize>) -> Self {
         match capacity {
             Some(cap) => Self::with_capacity(cap),
-            None => Self::new(),
+            None => Self::default(),
         }
     }
+
     pub fn serializer(&mut self) -> &mut RecordSerializer {
         if self.serializer.is_none() {
             self.serializer = Some(Box::new(RecordSerializer::default()));

src/scripting/script.rs

@@ -65,3 +65,21 @@ impl<S: Script> NuScript<S> {
             .await
     }
 }
+
+#[macro_export]
+macro_rules! script {
+    ($script:ident {
+        file = $name:literal
+        args = $argtype:ident
+    }) => {
+        pub struct $script;
+
+        impl $crate::scripting::script::Script for $script {
+            type Args = $argtype;
+
+            fn get_name() -> &'static str {
+                $name
+            }
+        }
+    };
+}

src/tasks/setup_users.rs

@@ -1,8 +1,11 @@
 use serde::Serialize;
 
-use crate::scripting::script::Script;
+use crate::script;
 
-pub struct SetupUsersScript;
+script!(SetupUsersScript {
+    file = "setup-users.nu"
+    args = UsersConfig
+});
 
 #[derive(Clone, Debug, Serialize)]
 pub struct UsersConfig {
@@ -16,11 +19,3 @@ pub struct User {
     pub sudoer: bool,
     pub shell: String,
 }
-
-impl Script for SetupUsersScript {
-    type Args = UsersConfig;
-
-    fn get_name() -> &'static str {
-        "setup-users.nu"
-    }
-}