Add command_prelude module (#12291)

# Description
When implementing a `Command`, one must also import all the types
present in the function signatures for `Command`. This makes it so that
we often import the same set of types in each command implementation
file. E.g., something like this:
```rust
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
    record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
    ShellError, Signature, Span, Type, Value,
};
```

This PR adds the `nu_engine::command_prelude` module which contains the
necessary and commonly used types to implement a `Command`:
```rust
// command_prelude.rs
pub use crate::CallExt;
pub use nu_protocol::{
    ast::{Call, CellPath},
    engine::{Command, EngineState, Stack},
    record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, IntoSpanned,
    PipelineData, Record, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
};
```

This should reduce the boilerplate needed to implement a command and
also gives us a place to track the breadth of the `Command` API. I tried
to be conservative with what went into the prelude modules, since it
might be hard/annoying to remove items from the prelude in the future.
Let me know if something should be included or excluded.

crates/nu-cmd-extra/src/extra/bits/and.rs

@@ -1,10 +1,5 @@
 use super::binary_op;
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Spanned, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct BitsAnd;

crates/nu-cmd-extra/src/extra/bits/bits_.rs

@@ -1,9 +1,4 @@
-use nu_engine::get_full_help;
-use nu_protocol::{
-    ast::Call,
-    engine::{Command, EngineState, Stack},
-    Category, IntoPipelineData, PipelineData, ShellError, Signature, Type, Value,
-};
+use nu_engine::{command_prelude::*, get_full_help};
 
 #[derive(Clone)]
 pub struct Bits;

crates/nu-cmd-extra/src/extra/bits/into.rs

@@ -1,11 +1,6 @@
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::{
-    ast::{Call, CellPath},
-    engine::{Command, EngineState, Stack},
-    Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, SyntaxShape,
-    Type, Value,
-};
+use nu_engine::command_prelude::*;
+
 use num_traits::ToPrimitive;
 
 pub struct Arguments {

crates/nu-cmd-extra/src/extra/bits/mod.rs

@@ -13,7 +13,6 @@ pub use and::BitsAnd;
 pub use bits_::Bits;
 pub use into::BitsInto;
 pub use not::BitsNot;
-use nu_protocol::{ShellError, Value};
 pub use or::BitsOr;
 pub use rotate_left::BitsRol;
 pub use rotate_right::BitsRor;
@@ -21,7 +20,7 @@ pub use shift_left::BitsShl;
 pub use shift_right::BitsShr;
 pub use xor::BitsXor;
 
-use nu_protocol::{Span, Spanned};
+use nu_protocol::{ShellError, Span, Spanned, Value};
 use std::iter;
 
 #[derive(Clone, Copy)]

crates/nu-cmd-extra/src/extra/bits/not.rs

@@ -1,11 +1,6 @@
 use super::{get_number_bytes, NumberBytes};
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::{Call, CellPath};
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct BitsNot;

crates/nu-cmd-extra/src/extra/bits/or.rs

@@ -1,10 +1,5 @@
 use super::binary_op;
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Spanned, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct BitsOr;

crates/nu-cmd-extra/src/extra/bits/rotate_left.rs

@@ -1,14 +1,7 @@
 use super::{get_input_num_type, get_number_bytes, InputNumType, NumberBytes};
 use itertools::Itertools;
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::ast::CellPath;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::Spanned;
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 struct Arguments {
     signed: bool,

crates/nu-cmd-extra/src/extra/bits/rotate_right.rs

@@ -1,14 +1,7 @@
 use super::{get_input_num_type, get_number_bytes, InputNumType, NumberBytes};
 use itertools::Itertools;
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::ast::CellPath;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::Spanned;
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 struct Arguments {
     signed: bool,

crates/nu-cmd-extra/src/extra/bits/shift_left.rs

@@ -1,14 +1,8 @@
 use super::{get_input_num_type, get_number_bytes, InputNumType, NumberBytes};
 use itertools::Itertools;
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::ast::CellPath;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::Spanned;
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
+
 use std::iter;
 
 struct Arguments {

crates/nu-cmd-extra/src/extra/bits/shift_right.rs

@@ -1,14 +1,8 @@
 use super::{get_input_num_type, get_number_bytes, InputNumType, NumberBytes};
 use itertools::Itertools;
 use nu_cmd_base::input_handler::{operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::ast::CellPath;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::Spanned;
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
+
 use std::iter;
 
 struct Arguments {

crates/nu-cmd-extra/src/extra/bits/xor.rs

@@ -1,10 +1,5 @@
 use super::binary_op;
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Spanned, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct BitsXor;

crates/nu-cmd-extra/src/extra/conversions/fmt.rs

@@ -1,10 +1,5 @@
 use nu_cmd_base::input_handler::{operate, CellPathOnlyArgs};
-use nu_engine::CallExt;
-use nu_protocol::{
-    ast::{Call, CellPath},
-    engine::{Command, EngineState, Stack},
-    record, Category, Example, PipelineData, ShellError, Signature, Span, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct Fmt;

crates/nu-cmd-extra/src/extra/filters/each_while.rs

@@ -1,11 +1,5 @@
-use nu_engine::{get_eval_block_with_early_return, CallExt};
-use nu_protocol::ast::Call;
-
-use nu_protocol::engine::{Closure, Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData, ShellError,
-    Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::{command_prelude::*, get_eval_block_with_early_return};
+use nu_protocol::engine::Closure;
 
 #[derive(Clone)]
 pub struct EachWhile;

crates/nu-cmd-extra/src/extra/filters/roll/mod.rs

@@ -5,6 +5,7 @@ mod roll_right;
 mod roll_up;
 
 use nu_protocol::{ShellError, Value};
+
 pub use roll_::Roll;
 pub use roll_down::RollDown;
 pub use roll_left::RollLeft;

crates/nu-cmd-extra/src/extra/filters/roll/roll_.rs

@@ -1,7 +1,4 @@
-use nu_engine::get_full_help;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, IntoPipelineData, PipelineData, ShellError, Signature, Type, Value};
+use nu_engine::{command_prelude::*, get_full_help};
 
 #[derive(Clone)]
 pub struct Roll;

crates/nu-cmd-extra/src/extra/filters/roll/roll_down.rs

@@ -1,12 +1,5 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape,
-    Type, Value,
-};
-
 use super::{vertical_rotate_value, VerticalDirection};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct RollDown;

crates/nu-cmd-extra/src/extra/filters/roll/roll_left.rs

@@ -1,12 +1,5 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape,
-    Type, Value,
-};
-
 use super::{horizontal_rotate_value, HorizontalDirection};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct RollLeft;

crates/nu-cmd-extra/src/extra/filters/roll/roll_right.rs

@@ -1,12 +1,5 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape,
-    Type, Value,
-};
-
 use super::{horizontal_rotate_value, HorizontalDirection};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct RollRight;

crates/nu-cmd-extra/src/extra/filters/roll/roll_up.rs

@@ -1,12 +1,5 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, SyntaxShape,
-    Type, Value,
-};
-
 use super::{vertical_rotate_value, VerticalDirection};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct RollUp;

crates/nu-cmd-extra/src/extra/filters/rotate.rs

@@ -1,11 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::IntoPipelineData;
-use nu_protocol::{
-    ast::Call,
-    engine::{Command, EngineState, Stack},
-    record, Category, Example, PipelineData, Record, ShellError, Signature, SyntaxShape, Type,
-    Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct Rotate;

crates/nu-cmd-extra/src/extra/filters/update_cells.rs

@@ -1,13 +1,6 @@
-use nu_engine::{get_eval_block, CallExt, EvalBlockFn};
-use nu_protocol::ast::{Block, Call};
-
-use nu_protocol::engine::{Closure, Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, IntoInterruptiblePipelineData, IntoPipelineData, PipelineData,
-    PipelineIterator, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
-use std::collections::HashSet;
-use std::sync::Arc;
+use nu_engine::{command_prelude::*, get_eval_block, EvalBlockFn};
+use nu_protocol::{ast::Block, engine::Closure, PipelineIterator};
+use std::{collections::HashSet, sync::Arc};
 
 #[derive(Clone)]
 pub struct UpdateCells;

crates/nu-cmd-extra/src/extra/formats/from/url.rs

@@ -1,8 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, Span, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct FromUrl;

crates/nu-cmd-extra/src/extra/formats/to/html.rs

@@ -1,18 +1,11 @@
 use fancy_regex::Regex;
 use nu_cmd_base::formats::to::delimited::merge_descriptors;
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Config, DataSource, Example, IntoPipelineData, PipelineData,
-    PipelineMetadata, ShellError, Signature, Span, Spanned, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
+use nu_protocol::{Config, DataSource, PipelineMetadata};
 use nu_utils::IgnoreCaseExt;
 use rust_embed::RustEmbed;
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
-use std::error::Error;
-use std::fmt::Write;
+use std::{collections::HashMap, error::Error, fmt::Write};
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct HtmlThemes {

crates/nu-cmd-extra/src/extra/math/arccos.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/arccosh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/arcsin.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/arcsinh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/arctan.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/arctanh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/cos.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/cosh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/exp.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/ln.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/sin.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/sinh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/tan.rs

@@ -1,7 +1,4 @@
-use nu_engine::CallExt;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/math/tanh.rs

@@ -1,6 +1,4 @@
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, Example, PipelineData, ShellError, Signature, Span, Type, Value};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/mod.rs

@@ -6,33 +6,12 @@ mod math;
 mod platform;
 mod strings;
 
-pub use bits::Bits;
-pub use bits::BitsAnd;
-pub use bits::BitsInto;
-pub use bits::BitsNot;
-pub use bits::BitsOr;
-pub use bits::BitsRol;
-pub use bits::BitsRor;
-pub use bits::BitsShl;
-pub use bits::BitsShr;
-pub use bits::BitsXor;
-
-pub use math::MathCos;
-pub use math::MathCosH;
-pub use math::MathSin;
-pub use math::MathSinH;
-pub use math::MathTan;
-pub use math::MathTanH;
-
-pub use math::MathExp;
-pub use math::MathLn;
-
-pub use math::MathArcCos;
-pub use math::MathArcCosH;
-pub use math::MathArcSin;
-pub use math::MathArcSinH;
-pub use math::MathArcTan;
-pub use math::MathArcTanH;
+pub use bits::{
+    Bits, BitsAnd, BitsInto, BitsNot, BitsOr, BitsRol, BitsRor, BitsShl, BitsShr, BitsXor,
+};
+pub use math::{MathArcCos, MathArcCosH, MathArcSin, MathArcSinH, MathArcTan, MathArcTanH};
+pub use math::{MathCos, MathCosH, MathSin, MathSinH, MathTan, MathTanH};
+pub use math::{MathExp, MathLn};
 
 use nu_protocol::engine::{EngineState, StateWorkingSet};
 

crates/nu-cmd-extra/src/extra/platform/ansi/gradient.rs

@@ -1,9 +1,5 @@
 use nu_ansi_term::{build_all_gradient_text, gradient::TargetGround, Gradient, Rgb};
-use nu_engine::CallExt;
-use nu_protocol::{
-    ast::Call, ast::CellPath, engine::Command, engine::EngineState, engine::Stack, Category,
-    Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/strings/encode_decode/decode_hex.rs

@@ -1,9 +1,5 @@
 use super::hex::{operate, ActionType};
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct DecodeHex;

crates/nu-cmd-extra/src/extra/strings/encode_decode/encode_hex.rs

@@ -1,9 +1,5 @@
 use super::hex::{operate, ActionType};
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct EncodeHex;

crates/nu-cmd-extra/src/extra/strings/encode_decode/hex.rs

@@ -1,8 +1,5 @@
 use nu_cmd_base::input_handler::{operate as general_operate, CmdArgument};
-use nu_engine::CallExt;
-use nu_protocol::ast::{Call, CellPath};
-use nu_protocol::engine::{EngineState, Stack};
-use nu_protocol::{PipelineData, ShellError, Span, Value};
+use nu_engine::command_prelude::*;
 
 enum HexDecodingError {
     InvalidLength(usize),

crates/nu-cmd-extra/src/extra/strings/format/command.rs

@@ -1,14 +1,6 @@
-use std::vec;
-
-use nu_engine::{get_eval_expression, CallExt};
+use nu_engine::{command_prelude::*, get_eval_expression};
 use nu_parser::parse_expression;
-use nu_protocol::ast::{Call, PathMember};
-
-use nu_protocol::engine::{Command, EngineState, Stack, StateWorkingSet};
-use nu_protocol::{
-    Category, Example, ListStream, PipelineData, ShellError, Signature, Span, SyntaxShape, Type,
-    Value,
-};
+use nu_protocol::{ast::PathMember, engine::StateWorkingSet, ListStream};
 
 #[derive(Clone)]
 pub struct FormatPattern;

crates/nu-cmd-extra/src/extra/strings/str_/case/camel_case.rs

@@ -1,11 +1,6 @@
-use heck::ToLowerCamelCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToLowerCamelCase;
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/strings/str_/case/kebab_case.rs

@@ -1,11 +1,6 @@
-use heck::ToKebabCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToKebabCase;
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/strings/str_/case/mod.rs

@@ -14,12 +14,8 @@ pub use snake_case::SubCommand as StrSnakeCase;
 pub use str_::Str;
 pub use title_case::SubCommand as StrTitleCase;
 
-use nu_engine::CallExt;
-
 use nu_cmd_base::input_handler::{operate as general_operate, CmdArgument};
-use nu_protocol::ast::{Call, CellPath};
-use nu_protocol::engine::{EngineState, Stack};
-use nu_protocol::{PipelineData, ShellError, Span, Value};
+use nu_engine::command_prelude::*;
 
 struct Arguments<F: Fn(&str) -> String + Send + Sync + 'static> {
     case_operation: &'static F,

crates/nu-cmd-extra/src/extra/strings/str_/case/pascal_case.rs

@@ -1,11 +1,6 @@
-use heck::ToUpperCamelCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToUpperCamelCase;
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/strings/str_/case/screaming_snake_case.rs

@@ -1,11 +1,6 @@
-use heck::ToShoutySnakeCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToShoutySnakeCase;
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;

crates/nu-cmd-extra/src/extra/strings/str_/case/snake_case.rs

@@ -1,11 +1,7 @@
-use heck::ToSnakeCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToSnakeCase;
+use nu_engine::command_prelude::*;
+
 #[derive(Clone)]
 pub struct SubCommand;
 

crates/nu-cmd-extra/src/extra/strings/str_/case/str_.rs

@@ -1,9 +1,4 @@
-use nu_engine::get_full_help;
-use nu_protocol::{
-    ast::Call,
-    engine::{Command, EngineState, Stack},
-    Category, IntoPipelineData, PipelineData, ShellError, Signature, Type, Value,
-};
+use nu_engine::{command_prelude::*, get_full_help};
 
 #[derive(Clone)]
 pub struct Str;

crates/nu-cmd-extra/src/extra/strings/str_/case/title_case.rs

@@ -1,11 +1,6 @@
-use heck::ToTitleCase;
-use nu_protocol::ast::Call;
-use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{
-    record, Category, Example, PipelineData, ShellError, Signature, SyntaxShape, Type, Value,
-};
-
 use super::operate;
+use heck::ToTitleCase;
+use nu_engine::command_prelude::*;
 
 #[derive(Clone)]
 pub struct SubCommand;