Apply nightly clippy fixes (#11083)

<!--
if this PR closes one or more issues, you can automatically link the PR
with
them by using one of the [*linking
keywords*](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword),
e.g.
- this PR should close #xxxx
- fixes #xxxx

you can also mention related issues, PRs or discussions!
-->

# Description
<!--
Thank you for improving Nushell. Please, check our [contributing
guide](../CONTRIBUTING.md) and talk to the core team before making major
changes.

Description of your pull request goes here. **Provide examples and/or
screenshots** if your changes affect the user experience.
-->
Clippy fixes for rust 1.76.0-nightly

# User-Facing Changes
<!-- List of all changes that impact the user experience here. This
helps us keep track of breaking changes. -->

N/A
# Tests + Formatting
<!--
Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used` to
check that you're using the standard code style
- `cargo test --workspace` to check that all tests pass (on Windows make
sure to [enable developer
mode](https://learn.microsoft.com/en-us/windows/apps/get-started/developer-mode-features-and-debugging))
- `cargo run -- -c "use std testing; testing run-tests --path
crates/nu-std"` to run the tests for the standard library

> **Note**
> from `nushell` you can also use the `toolkit` as follows
> ```bash
> use toolkit.nu # or use an `env_change` hook to activate it
automatically
> toolkit check pr
> ```
-->

# After Submitting
<!-- If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
-->

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

@@ -67,7 +67,7 @@ impl NuCompleter {
         let mut callee_stack = stack.gather_captures(&self.engine_state, &block.captures);
 
         // Line
-        if let Some(pos_arg) = block.signature.required_positional.get(0) {
+        if let Some(pos_arg) = block.signature.required_positional.first() {
             if let Some(var_id) = pos_arg.var_id {
                 callee_stack.add_var(
                     var_id,

crates/nu-cli/src/util.rs

@@ -111,7 +111,7 @@ fn gather_env_vars(
             let name = if let Some(Token {
                 contents: TokenContents::Item,
                 span,
-            }) = parts.get(0)
+            }) = parts.first()
             {
                 let mut working_set = StateWorkingSet::new(engine_state);
                 let bytes = working_set.get_span_contents(*span);

crates/nu-cli/tests/completions.rs

@@ -122,14 +122,14 @@ fn dotnu_completions() {
     let suggestions = completer.complete(&completion_str, completion_str.len());
 
     assert_eq!(1, suggestions.len());
-    assert_eq!("custom_completion.nu", suggestions.get(0).unwrap().value);
+    assert_eq!("custom_completion.nu", suggestions.first().unwrap().value);
 
     // Test use completion
     let completion_str = "use ".to_string();
     let suggestions = completer.complete(&completion_str, completion_str.len());
 
     assert_eq!(1, suggestions.len());
-    assert_eq!("custom_completion.nu", suggestions.get(0).unwrap().value);
+    assert_eq!("custom_completion.nu", suggestions.first().unwrap().value);
 }
 
 #[test]
@@ -141,7 +141,7 @@ fn external_completer_trailing_space() {
 
     let suggestions = run_external_completion(block, &input);
     assert_eq!(3, suggestions.len());
-    assert_eq!("gh", suggestions.get(0).unwrap().value);
+    assert_eq!("gh", suggestions.first().unwrap().value);
     assert_eq!("alias", suggestions.get(1).unwrap().value);
     assert_eq!("", suggestions.get(2).unwrap().value);
 }
@@ -153,7 +153,7 @@ fn external_completer_no_trailing_space() {
 
     let suggestions = run_external_completion(block, &input);
     assert_eq!(2, suggestions.len());
-    assert_eq!("gh", suggestions.get(0).unwrap().value);
+    assert_eq!("gh", suggestions.first().unwrap().value);
     assert_eq!("alias", suggestions.get(1).unwrap().value);
 }
 
@@ -164,7 +164,7 @@ fn external_completer_pass_flags() {
 
     let suggestions = run_external_completion(block, &input);
     assert_eq!(3, suggestions.len());
-    assert_eq!("gh", suggestions.get(0).unwrap().value);
+    assert_eq!("gh", suggestions.first().unwrap().value);
     assert_eq!("api", suggestions.get(1).unwrap().value);
     assert_eq!("--", suggestions.get(2).unwrap().value);
 }

crates/nu-cmd-dataframe/src/dataframe/eager/drop.rs

@@ -68,7 +68,7 @@ fn command(
     let df = NuDataFrame::try_from_pipeline(input, call.head)?;
 
     let new_df = col_string
-        .get(0)
+        .first()
         .ok_or_else(|| {
             ShellError::GenericError(
                 "Empty names list".into(),

crates/nu-cmd-dataframe/src/dataframe/eager/sql_context.rs

@@ -29,15 +29,15 @@ impl SQLContext {
     fn execute_select(&self, select_stmt: &Select) -> Result<LazyFrame, PolarsError> {
         // Determine involved dataframe
         // Implicit join require some more work in query parsers, Explicit join are preferred for now.
-        let tbl = select_stmt.from.get(0).ok_or_else(|| {
+        let tbl = select_stmt.from.first().ok_or_else(|| {
             PolarsError::ComputeError(ErrString::from("No table found in select statement"))
         })?;
         let mut alias_map = HashMap::new();
         let tbl_name = match &tbl.relation {
             TableFactor::Table { name, alias, .. } => {
                 let tbl_name = name
                     .0
-                    .get(0)
+                    .first()
                     .ok_or_else(|| {
                         PolarsError::ComputeError(ErrString::from(
                             "No table found in select statement",
@@ -182,7 +182,7 @@ impl SQLContext {
             ))
         } else {
             let ast = ast
-                .get(0)
+                .first()
                 .ok_or_else(|| PolarsError::ComputeError(ErrString::from("No statement found")))?;
             Ok(match ast {
                 Statement::Query(query) => {

crates/nu-cmd-dataframe/src/dataframe/values/nu_dataframe/mod.rs

@@ -325,7 +325,7 @@ impl NuDataFrame {
         let series = self
             .df
             .get_columns()
-            .get(0)
+            .first()
             .expect("We have already checked that the width is 1");
 
         Ok(series.clone())

crates/nu-cmd-dataframe/src/dataframe/values/utils.rs

@@ -11,7 +11,7 @@ pub(crate) fn convert_columns(
 ) -> Result<(Vec<Spanned<String>>, Span), ShellError> {
     // First column span
     let mut col_span = columns
-        .get(0)
+        .first()
         .ok_or_else(|| {
             ShellError::GenericError(
                 "Empty column list".into(),
@@ -54,7 +54,7 @@ pub(crate) fn convert_columns_string(
 ) -> Result<(Vec<String>, Span), ShellError> {
     // First column span
     let mut col_span = columns
-        .get(0)
+        .first()
         .ok_or_else(|| {
             ShellError::GenericError(
                 "Empty column list".into(),

crates/nu-command/src/filters/group_by.rs

@@ -271,7 +271,7 @@ fn group_closure(
                         ));
                     }
 
-                    let value = match collection.get(0) {
+                    let value = match collection.first() {
                         Some(Value::Error { .. }) | None => Value::string(error_key, span),
                         Some(return_value) => return_value.clone(),
                     };

crates/nu-command/src/filters/insert.rs

@@ -171,7 +171,7 @@ fn insert(
             ctrlc,
         )
     } else {
-        if let Some(PathMember::Int { val, .. }) = cell_path.members.get(0) {
+        if let Some(PathMember::Int { val, .. }) = cell_path.members.first() {
             let mut input = input.into_iter();
             let mut pre_elems = vec![];
 

crates/nu-command/src/filters/reject.rs

@@ -221,7 +221,7 @@ fn reject(
     let mut new_rows = vec![];
     for column in cell_paths {
         let CellPath { ref members } = column;
-        match members.get(0) {
+        match members.first() {
             Some(PathMember::Int { val, span, .. }) => {
                 if members.len() > 1 {
                     return Err(ShellError::GenericError(

crates/nu-command/src/filters/select.rs

@@ -212,7 +212,7 @@ fn select(
 
     for column in columns {
         let CellPath { ref members } = column;
-        match members.get(0) {
+        match members.first() {
             Some(PathMember::Int { val, span, .. }) => {
                 if members.len() > 1 {
                     return Err(ShellError::GenericError(

crates/nu-command/src/filters/transpose.rs

@@ -190,7 +190,7 @@ pub fn transpose(
 
     if args.header_row {
         for i in input.iter() {
-            if let Some(desc) = descs.get(0) {
+            if let Some(desc) = descs.first() {
                 match &i.get_data_by_key(desc) {
                     Some(x) => {
                         if let Ok(s) = x.as_string() {

crates/nu-command/src/filters/update.rs

@@ -171,7 +171,7 @@ fn update(
             )?
             .set_metadata(mdclone))
     } else {
-        if let Some(PathMember::Int { val, span, .. }) = cell_path.members.get(0) {
+        if let Some(PathMember::Int { val, span, .. }) = cell_path.members.first() {
             let mut input = input.into_iter();
             let mut pre_elems = vec![];
 

crates/nu-command/src/filters/upsert.rs

@@ -186,7 +186,7 @@ fn upsert(
             ctrlc,
         )
     } else {
-        if let Some(PathMember::Int { val, span, .. }) = cell_path.members.get(0) {
+        if let Some(PathMember::Int { val, span, .. }) = cell_path.members.first() {
             let mut input = input.into_iter();
             let mut pre_elems = vec![];
 

crates/nu-command/src/formats/from/nuon.rs

@@ -59,7 +59,7 @@ impl Command for FromNuon {
         let mut block = nu_parser::parse(&mut working_set, None, string_input.as_bytes(), false);
 
         if let Some(pipeline) = block.pipelines.get(1) {
-            if let Some(element) = pipeline.elements.get(0) {
+            if let Some(element) = pipeline.elements.first() {
                 return Err(ShellError::GenericError(
                     "error when loading nuon text".into(),
                     "could not load nuon text".into(),

crates/nu-command/src/math/reducers.rs

@@ -79,7 +79,7 @@ pub fn min(data: Vec<Value>, span: Span, head: Span) -> Result<Value, ShellError
 }
 
 pub fn sum(data: Vec<Value>, span: Span, head: Span) -> Result<Value, ShellError> {
-    let initial_value = data.get(0);
+    let initial_value = data.first();
 
     let mut acc = match initial_value {
         Some(v) => {
@@ -124,7 +124,7 @@ pub fn sum(data: Vec<Value>, span: Span, head: Span) -> Result<Value, ShellError
 }
 
 pub fn product(data: Vec<Value>, span: Span, head: Span) -> Result<Value, ShellError> {
-    let initial_value = data.get(0);
+    let initial_value = data.first();
 
     let mut acc = match initial_value {
         Some(v) => {

crates/nu-explore/src/nu_common/mod.rs

@@ -15,7 +15,7 @@ pub use nu_protocol::{Config as NuConfig, Span as NuSpan};
 pub type NuText = (String, TextStyle);
 pub type CtrlC = Option<Arc<AtomicBool>>;
 
-pub use command::{is_ignored_command, run_command_with_value, run_nu_command};
+pub use command::run_command_with_value;
 pub use lscolor::{create_lscolors, lscolorize};
 pub use string::{string_width, truncate_str};
 pub use table::try_build_table;

crates/nu-explore/src/views/record/mod.rs

@@ -721,7 +721,7 @@ fn build_table_as_record(v: &RecordView) -> Value {
     let layer = v.get_layer_last();
 
     let cols = layer.columns.to_vec();
-    let vals = layer.records.get(0).map_or(Vec::new(), |row| row.clone());
+    let vals = layer.records.first().map_or(Vec::new(), |row| row.clone());
 
     Value::record(Record::from_raw_cols_vals(cols, vals), NuSpan::unknown())
 }

crates/nu-json/README.md

@@ -63,7 +63,7 @@ fn main() {
 
         // Extract the array
         let array : &mut Vec<Value> = sample.get_mut("array").unwrap().as_array_mut().unwrap();
-        println!("first: {}", array.get(0).unwrap());
+        println!("first: {}", array.first().unwrap());
 
         // Add a value
         array.push(Value::String("tak".to_string()));

crates/nu-lsp/src/lib.rs

@@ -63,7 +63,7 @@ impl LanguageServer {
         engine_state: EngineState,
         ctrlc: Arc<AtomicBool>,
     ) -> Result<()> {
-        let server_capabilities = serde_json::to_value(&ServerCapabilities {
+        let server_capabilities = serde_json::to_value(ServerCapabilities {
             text_document_sync: Some(lsp_types::TextDocumentSyncCapability::Kind(
                 TextDocumentSyncKind::INCREMENTAL,
             )),

crates/nu-parser/src/parse_keywords.rs

@@ -70,13 +70,13 @@ pub const UNALIASABLE_PARSER_KEYWORDS: &[&[u8]] = &[
 /// Check whether spans start with a parser keyword that can be aliased
 pub fn is_unaliasable_parser_keyword(working_set: &StateWorkingSet, spans: &[Span]) -> bool {
     // try two words
-    if let (Some(span1), Some(span2)) = (spans.get(0), spans.get(1)) {
+    if let (Some(span1), Some(span2)) = (spans.first(), spans.get(1)) {
         let cmd_name = working_set.get_span_contents(span(&[*span1, *span2]));
         return UNALIASABLE_PARSER_KEYWORDS.contains(&cmd_name);
     }
 
     // try one word
-    if let Some(span1) = spans.get(0) {
+    if let Some(span1) = spans.first() {
         let cmd_name = working_set.get_span_contents(*span1);
         UNALIASABLE_PARSER_KEYWORDS.contains(&cmd_name)
     } else {
@@ -653,7 +653,7 @@ pub fn parse_extern(
 
             let (command_spans, rest_spans) = spans.split_at(split_id);
 
-            if let Some(name_span) = rest_spans.get(0) {
+            if let Some(name_span) = rest_spans.first() {
                 if let Some(err) = detect_params_in_name(
                     working_set,
                     *name_span,
@@ -1135,7 +1135,7 @@ pub fn parse_export_in_module(
 ) -> (Pipeline, Vec<Exportable>) {
     let spans = &lite_command.parts[..];
 
-    let export_span = if let Some(sp) = spans.get(0) {
+    let export_span = if let Some(sp) = spans.first() {
         if working_set.get_span_contents(*sp) != b"export" {
             working_set.error(ParseError::UnknownState(
                 "expected export statement".into(),
@@ -1209,7 +1209,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref def_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = def_call.clone();
 
@@ -1249,7 +1249,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref def_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = def_call.clone();
 
@@ -1310,7 +1310,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref def_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = def_call.clone();
 
@@ -1370,7 +1370,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref alias_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = alias_call.clone();
 
@@ -1429,7 +1429,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref use_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = use_call.clone();
 
@@ -1466,7 +1466,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref module_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = module_call.clone();
 
@@ -1523,7 +1523,7 @@ pub fn parse_export_in_module(
                         expr: Expr::Call(ref def_call),
                         ..
                     },
-                )) = pipeline.elements.get(0)
+                )) = pipeline.elements.first()
                 {
                     call = def_call.clone();
 

crates/nu-parser/src/parser.rs

@@ -1572,10 +1572,10 @@ pub fn parse_brace_expr(
     let (tokens, _) = lex(bytes, span.start + 1, &[b'\r', b'\n', b'\t'], &[b':'], true);
 
     let second_token = tokens
-        .get(0)
+        .first()
         .map(|token| working_set.get_span_contents(token.span));
 
-    let second_token_contents = tokens.get(0).map(|token| token.contents);
+    let second_token_contents = tokens.first().map(|token| token.contents);
 
     let third_token = tokens
         .get(1)
@@ -2666,7 +2666,7 @@ pub fn parse_string_strict(working_set: &mut StateWorkingSet, span: Span) -> Exp
 }
 
 pub fn parse_import_pattern(working_set: &mut StateWorkingSet, spans: &[Span]) -> Expression {
-    let Some(head_span) = spans.get(0) else {
+    let Some(head_span) = spans.first() else {
         working_set.error(ParseError::WrongImportPattern(
             "needs at least one component of import pattern".to_string(),
             span(spans),