fix(completion): DotNuCompletion now completes nu scripts in const $NU_LIB_DIRS (#14955)

# Description

For nu scripts completion with command `use`/`overlay use`/`source-env`,
it now supports `nu --include-path`.

Also fixes some irrelevant clippy complaints.

# User-Facing Changes

# Tests + Formatting

# After Submitting

crates/nu-cli/src/completions/dotnu_completions.rs

@@ -41,25 +41,28 @@ impl Completer for DotNuCompletion {
         let mut is_current_folder = false;
 
         // Fetch the lib dirs
-        let lib_dirs: Vec<String> = if let Some(lib_dirs) = working_set.get_env_var("NU_LIB_DIRS") {
-            lib_dirs
-                .as_list()
-                .into_iter()
-                .flat_map(|it| {
-                    it.iter().map(|x| {
-                        x.to_path()
-                            .expect("internal error: failed to convert lib path")
+        let lib_dirs: Vec<String> = working_set
+            .find_variable(b"$NU_LIB_DIRS")
+            .and_then(|vid| working_set.get_variable(vid).const_val.as_ref())
+            .or(working_set.get_env_var("NU_LIB_DIRS"))
+            .map(|lib_dirs| {
+                lib_dirs
+                    .as_list()
+                    .into_iter()
+                    .flat_map(|it| {
+                        it.iter().map(|x| {
+                            x.to_path()
+                                .expect("internal error: failed to convert lib path")
+                        })
                     })
-                })
-                .map(|it| {
-                    it.into_os_string()
-                        .into_string()
-                        .expect("internal error: failed to convert OS path")
-                })
-                .collect()
-        } else {
-            vec![]
-        };
+                    .map(|it| {
+                        it.into_os_string()
+                            .into_string()
+                            .expect("internal error: failed to convert OS path")
+                    })
+                    .collect()
+            })
+            .unwrap_or_default();
 
         // Check if the base_dir is a folder
         // rsplit_once removes the separator

crates/nu-cli/src/repl.rs

@@ -1159,7 +1159,7 @@ fn setup_history(
 /// Setup Reedline keybindingds based on the provided config
 ///
 fn setup_keybindings(engine_state: &EngineState, line_editor: Reedline) -> Reedline {
-    return match create_keybindings(engine_state.get_config()) {
+    match create_keybindings(engine_state.get_config()) {
         Ok(keybindings) => match keybindings {
             KeybindingsMode::Emacs(keybindings) => {
                 let edit_mode = Box::new(Emacs::new(keybindings));
@@ -1177,7 +1177,7 @@ fn setup_keybindings(engine_state: &EngineState, line_editor: Reedline) -> Reedl
             report_shell_error(engine_state, &e);
             line_editor
         }
-    };
+    }
 }
 
 ///

crates/nu-cli/src/util.rs

@@ -132,7 +132,7 @@ fn gather_env_vars(
                     working_set.error(err);
                 }
 
-                if working_set.parse_errors.first().is_some() {
+                if !working_set.parse_errors.is_empty() {
                     report_capture_error(
                         engine_state,
                         &String::from_utf8_lossy(contents),
@@ -176,7 +176,7 @@ fn gather_env_vars(
                     working_set.error(err);
                 }
 
-                if working_set.parse_errors.first().is_some() {
+                if !working_set.parse_errors.is_empty() {
                     report_capture_error(
                         engine_state,
                         &String::from_utf8_lossy(contents),

crates/nu-lsp/src/ast.rs

@@ -282,7 +282,7 @@ fn try_find_id_in_use(
     id: Option<&Id>,
 ) -> Option<(Id, Span)> {
     let call_name = working_set.get_span_contents(call.head);
-    if call_name != b"use" && call_name != b"hide" {
+    if call_name != b"use" && call_name != b"export use" && call_name != b"hide" {
         return None;
     }
     // TODO: for keyword `hide`, the decl/var is already hidden in working_set,
@@ -318,7 +318,7 @@ fn try_find_id_in_use(
     if let Some(pos) = location {
         // first argument of `use` should always be module name
         // while it is optional in `hide`
-        if span.contains(*pos) && call_name == b"use" {
+        if span.contains(*pos) && call_name != b"hide" {
             return get_matched_module_id(working_set, span, id);
         }
     }
@@ -338,7 +338,7 @@ fn try_find_id_in_use(
         })
     };
 
-    let arguments = if call_name == b"use" {
+    let arguments = if call_name != b"hide" {
         call.arguments.get(1..)?
     } else {
         call.arguments.as_slice()