Reworking help aliases (#8372)

crates/nu-engine/src/scope.rs

@@ -1,7 +1,8 @@
 use nu_protocol::{
-    engine::{EngineState, Stack, Visibility},
+    engine::{Command, EngineState, Stack, Visibility},
     ShellError, Signature, Span, SyntaxShape, Type, Value,
 };
+use std::borrow::Borrow;
 use std::cmp::Ordering;
 use std::collections::HashMap;
 
@@ -494,6 +495,36 @@ impl<'e, 's> ScopeData<'e, 's> {
                 });
             }
         }
+        for (name_bytes, decl_id) in self.engine_state.get_decls_sorted(false) {
+            if self.visibility.is_decl_id_visible(&decl_id) {
+                let decl = self.engine_state.get_decl(decl_id);
+                if let Some(alias) = decl.as_alias() {
+                    let name = String::from_utf8_lossy(&name_bytes).to_string();
+                    let sig = decl.signature().update_from_command(name, decl.borrow());
+                    let key = sig.name;
+
+                    aliases.push(Value::Record {
+                        cols: vec!["name".into(), "expansion".into(), "usage".into()],
+                        vals: vec![
+                            Value::String { val: key, span },
+                            Value::String {
+                                val: String::from_utf8_lossy(
+                                    self.engine_state
+                                        .get_span_contents(&alias.wrapped_call.span),
+                                )
+                                .to_string(),
+                                span,
+                            },
+                            Value::String {
+                                val: alias.signature().usage,
+                                span,
+                            },
+                        ],
+                        span,
+                    });
+                }
+            }
+        }
 
         aliases.sort_by(|a, b| a.partial_cmp(b).unwrap_or(Ordering::Equal));
         aliases