Add and use new Signals struct (#13314)

# Description
This PR introduces a new `Signals` struct to replace our adhoc passing
around of `ctrlc: Option<Arc<AtomicBool>>`. Doing so has a few benefits:
- We can better enforce when/where resetting or triggering an interrupt
is allowed.
- Consolidates `nu_utils::ctrl_c::was_pressed` and other ad-hoc
re-implementations into a single place: `Signals::check`.
- This allows us to add other types of signals later if we want. E.g.,
exiting or suspension.
- Similarly, we can more easily change the underlying implementation if
we need to in the future.
- Places that used to have a `ctrlc` of `None` now use
`Signals::empty()`, so we can double check these usages for correctness
in the future.

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

@@ -79,7 +79,7 @@ impl Command for BitsAnd {
 
         input.map(
             move |value| binary_op(&value, &target, little_endian, |(l, r)| l & r, head),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -3,6 +3,7 @@ use std::io::{self, Read, Write};
 use nu_cmd_base::input_handler::{operate, CmdArgument};
 use nu_engine::command_prelude::*;
 
+use nu_protocol::Signals;
 use num_traits::ToPrimitive;
 
 pub struct Arguments {
@@ -127,31 +128,36 @@ fn into_bits(
         ))
     } else {
         let args = Arguments { cell_paths };
-        operate(action, args, input, call.head, engine_state.ctrlc.clone())
+        operate(action, args, input, call.head, engine_state.signals())
     }
 }
 
 fn byte_stream_to_bits(stream: ByteStream, head: Span) -> ByteStream {
     if let Some(mut reader) = stream.reader() {
         let mut is_first = true;
-        ByteStream::from_fn(head, None, ByteStreamType::String, move |buffer| {
-            let mut byte = [0];
-            if reader.read(&mut byte[..]).err_span(head)? > 0 {
-                // Format the byte as bits
-                if is_first {
-                    is_first = false;
+        ByteStream::from_fn(
+            head,
+            Signals::empty(),
+            ByteStreamType::String,
+            move |buffer| {
+                let mut byte = [0];
+                if reader.read(&mut byte[..]).err_span(head)? > 0 {
+                    // Format the byte as bits
+                    if is_first {
+                        is_first = false;
+                    } else {
+                        buffer.push(b' ');
+                    }
+                    write!(buffer, "{:08b}", byte[0]).expect("format failed");
+                    Ok(true)
                 } else {
-                    buffer.push(b' ');
+                    // EOF
+                    Ok(false)
                 }
-                write!(buffer, "{:08b}", byte[0]).expect("format failed");
-                Ok(true)
-            } else {
-                // EOF
-                Ok(false)
-            }
-        })
+            },
+        )
     } else {
-        ByteStream::read(io::empty(), head, None, ByteStreamType::String)
+        ByteStream::read(io::empty(), head, Signals::empty(), ByteStreamType::String)
     }
 }
 

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

@@ -82,7 +82,7 @@ impl Command for BitsNot {
             number_size,
         };
 
-        operate(action, args, input, head, engine_state.ctrlc.clone())
+        operate(action, args, input, head, engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -80,7 +80,7 @@ impl Command for BitsOr {
 
         input.map(
             move |value| binary_op(&value, &target, little_endian, |(l, r)| l | r, head),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -86,7 +86,7 @@ impl Command for BitsRol {
             bits,
         };
 
-        operate(action, args, input, head, engine_state.ctrlc.clone())
+        operate(action, args, input, head, engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -86,7 +86,7 @@ impl Command for BitsRor {
             bits,
         };
 
-        operate(action, args, input, head, engine_state.ctrlc.clone())
+        operate(action, args, input, head, engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -88,7 +88,7 @@ impl Command for BitsShl {
             bits,
         };
 
-        operate(action, args, input, head, engine_state.ctrlc.clone())
+        operate(action, args, input, head, engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -88,7 +88,7 @@ impl Command for BitsShr {
             bits,
         };
 
-        operate(action, args, input, head, engine_state.ctrlc.clone())
+        operate(action, args, input, head, engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -80,7 +80,7 @@ impl Command for BitsXor {
 
         input.map(
             move |value| binary_op(&value, &target, little_endian, |(l, r)| l ^ r, head),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -59,7 +59,7 @@ fn fmt(
 ) -> Result<PipelineData, ShellError> {
     let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
     let args = CellPathOnlyArgs::from(cell_paths);
-    operate(action, args, input, call.head, engine_state.ctrlc.clone())
+    operate(action, args, input, call.head, engine_state.signals())
 }
 
 fn action(input: &Value, _args: &CellPathOnlyArgs, span: Span) -> Value {

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

@@ -89,7 +89,7 @@ impl Command for EachWhile {
                         }
                     })
                     .fuse()
-                    .into_pipeline_data(head, engine_state.ctrlc.clone()))
+                    .into_pipeline_data(head, engine_state.signals().clone()))
             }
             PipelineData::ByteStream(stream, ..) => {
                 let span = stream.span();
@@ -107,7 +107,7 @@ impl Command for EachWhile {
                             }
                         })
                         .fuse()
-                        .into_pipeline_data(head, engine_state.ctrlc.clone()))
+                        .into_pipeline_data(head, engine_state.signals().clone()))
                 } else {
                     Ok(PipelineData::Empty)
                 }

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

@@ -108,7 +108,7 @@ impl Command for UpdateCells {
             columns,
             span: head,
         }
-        .into_pipeline_data(head, engine_state.ctrlc.clone())
+        .into_pipeline_data(head, engine_state.signals().clone())
         .set_metadata(metadata))
     }
 }

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

@@ -45,7 +45,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -45,7 +45,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -45,7 +45,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -44,7 +44,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -44,7 +44,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -44,7 +44,7 @@ impl Command for SubCommand {
         }
         input.map(
             move |value| operate(value, head, use_degrees),
-            engine_state.ctrlc.clone(),
+            engine_state.signals(),
         )
     }
 

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

@@ -41,10 +41,7 @@ impl Command for SubCommand {
         if matches!(input, PipelineData::Empty) {
             return Err(ShellError::PipelineEmpty { dst_span: head });
         }
-        input.map(
-            move |value| operate(value, head),
-            engine_state.ctrlc.clone(),
-        )
+        input.map(move |value| operate(value, head), engine_state.signals())
     }
 
     fn examples(&self) -> Vec<Example> {

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

@@ -140,7 +140,7 @@ fn operate(
                 ret
             }
         },
-        engine_state.ctrlc.clone(),
+        engine_state.signals(),
     )
 }
 

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

@@ -88,7 +88,7 @@ pub fn operate(
         cell_paths,
     };
 
-    general_operate(action, args, input, call.head, engine_state.ctrlc.clone())
+    general_operate(action, args, input, call.head, engine_state.signals())
 }
 
 fn action(

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

@@ -220,7 +220,7 @@ fn format(
                 }
             }
 
-            Ok(ListStream::new(list.into_iter(), head_span, engine_state.ctrlc.clone()).into())
+            Ok(ListStream::new(list.into_iter(), head_span, engine_state.signals().clone()).into())
         }
         // Unwrapping this ShellError is a bit unfortunate.
         // Ideally, its Span would be preserved.

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

@@ -44,7 +44,7 @@ where
         case_operation,
         cell_paths,
     };
-    general_operate(action, args, input, call.head, engine_state.ctrlc.clone())
+    general_operate(action, args, input, call.head, engine_state.signals())
 }
 
 fn action<F>(input: &Value, args: &Arguments<F>, head: Span) -> Value