cratification: move the bytes command to nu-cmd-extra (#9509)

now that #9455 has landed we can move the bytes command to nu-cmd-extra

in concert with

moving nu_command::util to nu-cmd-base

crates/nu-cmd-base/src/lib.rs

@@ -1 +1,2 @@
 pub mod input_handler;
+pub mod util;

crates/nu-cmd-base/src/util.rs

@@ -0,0 +1,57 @@
+use nu_protocol::report_error;
+use nu_protocol::{
+    ast::RangeInclusion,
+    engine::{EngineState, Stack, StateWorkingSet},
+    Range, ShellError, Span, Value,
+};
+use std::path::PathBuf;
+
+pub fn get_init_cwd() -> PathBuf {
+    std::env::current_dir().unwrap_or_else(|_| {
+        std::env::var("PWD")
+            .map(Into::into)
+            .unwrap_or_else(|_| nu_path::home_dir().unwrap_or_default())
+    })
+}
+
+pub fn get_guaranteed_cwd(engine_state: &EngineState, stack: &Stack) -> PathBuf {
+    nu_engine::env::current_dir(engine_state, stack).unwrap_or_else(|e| {
+        let working_set = StateWorkingSet::new(engine_state);
+        report_error(&working_set, &e);
+        crate::util::get_init_cwd()
+    })
+}
+
+type MakeRangeError = fn(&str, Span) -> ShellError;
+
+pub fn process_range(range: &Range) -> Result<(isize, isize), MakeRangeError> {
+    let start = match &range.from {
+        Value::Int { val, .. } => isize::try_from(*val).unwrap_or_default(),
+        Value::Nothing { .. } => 0,
+        _ => {
+            return Err(|msg, span| ShellError::TypeMismatch {
+                err_message: msg.to_string(),
+                span,
+            })
+        }
+    };
+
+    let end = match &range.to {
+        Value::Int { val, .. } => {
+            if matches!(range.inclusion, RangeInclusion::Inclusive) {
+                isize::try_from(*val).unwrap_or(isize::max_value())
+            } else {
+                isize::try_from(*val).unwrap_or(isize::max_value()) - 1
+            }
+        }
+        Value::Nothing { .. } => isize::max_value(),
+        _ => {
+            return Err(|msg, span| ShellError::TypeMismatch {
+                err_message: msg.to_string(),
+                span,
+            })
+        }
+    };
+
+    Ok((start, end))
+}