Refactor scope commands (#10023)

crates/nu-cmd-lang/src/core_commands/scope/aliases.rs

@@ -35,7 +35,7 @@ impl Command for ScopeAliases {
         let ctrlc = engine_state.ctrlc.clone();
 
         let mut scope_data = ScopeData::new(engine_state, stack);
-        scope_data.populate_all();
+        scope_data.populate_decls();
 
         Ok(scope_data.collect_aliases(span).into_pipeline_data(ctrlc))
     }

crates/nu-cmd-lang/src/core_commands/scope/commands.rs

@@ -35,7 +35,7 @@ impl Command for ScopeCommands {
         let ctrlc = engine_state.ctrlc.clone();
 
         let mut scope_data = ScopeData::new(engine_state, stack);
-        scope_data.populate_all();
+        scope_data.populate_decls();
 
         Ok(scope_data.collect_commands(span).into_pipeline_data(ctrlc))
     }

crates/nu-cmd-lang/src/core_commands/scope/engine_stats.rs

@@ -31,8 +31,7 @@ impl Command for ScopeEngineStats {
     ) -> Result<PipelineData, ShellError> {
         let span = call.head;
 
-        let mut scope_data = ScopeData::new(engine_state, stack);
-        scope_data.populate_all();
+        let scope_data = ScopeData::new(engine_state, stack);
 
         Ok(scope_data.collect_engine_state(span).into_pipeline_data())
     }

crates/nu-cmd-lang/src/core_commands/scope/externs.rs

@@ -0,0 +1,62 @@
+use nu_engine::scope::ScopeData;
+use nu_protocol::ast::Call;
+use nu_protocol::engine::{Command, EngineState, Stack};
+use nu_protocol::{
+    Category, Example, IntoInterruptiblePipelineData, PipelineData, ShellError, Signature, Type,
+};
+
+#[derive(Clone)]
+pub struct ScopeExterns;
+
+impl Command for ScopeExterns {
+    fn name(&self) -> &str {
+        "scope externs"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("scope externs")
+            .input_output_types(vec![(Type::Nothing, Type::Any)])
+            .allow_variants_without_examples(true)
+            .category(Category::Filters)
+    }
+
+    fn usage(&self) -> &str {
+        "Output info on the known externals in the current scope."
+    }
+
+    fn run(
+        &self,
+        engine_state: &EngineState,
+        stack: &mut Stack,
+        call: &Call,
+        _input: PipelineData,
+    ) -> Result<PipelineData, ShellError> {
+        let span = call.head;
+        let ctrlc = engine_state.ctrlc.clone();
+
+        let mut scope_data = ScopeData::new(engine_state, stack);
+        scope_data.populate_decls();
+
+        Ok(scope_data.collect_externs(span).into_pipeline_data(ctrlc))
+    }
+
+    fn examples(&self) -> Vec<Example> {
+        vec![Example {
+            description: "Show the known externals in the current scope",
+            example: "scope externs",
+            result: None,
+        }]
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_examples() {
+        use crate::test_examples;
+
+        test_examples(ScopeExterns {})
+    }
+}

crates/nu-cmd-lang/src/core_commands/scope/mod.rs

@@ -2,6 +2,7 @@ mod aliases;
 mod command;
 mod commands;
 mod engine_stats;
+mod externs;
 mod modules;
 mod variables;
 
@@ -9,5 +10,6 @@ pub use aliases::*;
 pub use command::*;
 pub use commands::*;
 pub use engine_stats::*;
+pub use externs::*;
 pub use modules::*;
 pub use variables::*;

crates/nu-cmd-lang/src/core_commands/scope/variables.rs

@@ -35,7 +35,7 @@ impl Command for ScopeVariables {
         let ctrlc = engine_state.ctrlc.clone();
 
         let mut scope_data = ScopeData::new(engine_state, stack);
-        scope_data.populate_all();
+        scope_data.populate_vars();
 
         Ok(scope_data.collect_vars(span).into_pipeline_data(ctrlc))
     }