Test command names and search terms for redundancy (#6380)

* Test commands for proper names and search terms

Assert that the `Command.name()` is equal to `Signature.name`

Check that search terms are not just substrings of the command name as
they would not help finding the command.

* Clean up search terms

Remove redundant terms that just replicate the command name.
Try to eliminate substring between search terms, clean up where
necessary.

crates/nu-command/tests/main.rs

@@ -23,3 +23,55 @@ fn quickcheck_parse(data: String) -> bool {
     }
     true
 }
+
+#[test]
+fn signature_name_matches_command_name() {
+    let ctx = crate::create_default_context();
+    let decls = ctx.get_decl_ids_sorted(true);
+    let mut failures = Vec::new();
+
+    for decl_id in decls {
+        let cmd = ctx.get_decl(decl_id);
+        let cmd_name = cmd.name();
+        let sig_name = cmd.signature().name;
+        let category = cmd.signature().category;
+
+        if cmd_name != sig_name {
+            failures.push(format!(
+                "{cmd_name} ({category:?}): Signature name \"{sig_name}\" is not equal to the command name \"{cmd_name}\""
+            ));
+        }
+    }
+
+    assert!(
+        failures.is_empty(),
+        "Name mismatch:\n{}",
+        failures.join("\n")
+    );
+}
+
+#[test]
+fn no_search_term_duplicates() {
+    let ctx = crate::create_default_context();
+    let decls = ctx.get_decl_ids_sorted(true);
+    let mut failures = Vec::new();
+
+    for decl_id in decls {
+        let cmd = ctx.get_decl(decl_id);
+        let cmd_name = cmd.name();
+        let search_terms = cmd.search_terms();
+        let category = cmd.signature().category;
+
+        for search_term in search_terms {
+            if cmd_name.contains(search_term) {
+                failures.push(format!("{cmd_name} ({category:?}): Search term \"{search_term}\" is substring of command name \"{cmd_name}\""));
+            }
+        }
+    }
+
+    assert!(
+        failures.is_empty(),
+        "Duplication in search terms:\n{}",
+        failures.join("\n")
+    );
+}