port string case commands to engine-p (#3649)

Port snake_case and friends to engine-p syntax.

Part of #3390.

crates/nu-command/src/commands/strings/str_/case/camel_case.rs

@@ -23,7 +23,7 @@ impl WholeStreamCommand for SubCommand {
         "converts a string to camelCase"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         operate(args, &to_camel_case)
     }
 

crates/nu-command/src/commands/strings/str_/case/kebab_case.rs

@@ -23,7 +23,7 @@ impl WholeStreamCommand for SubCommand {
         "converts a string to kebab-case"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         operate(args, &to_kebab_case)
     }
 

crates/nu-command/src/commands/strings/str_/case/mod.rs

@@ -7,7 +7,7 @@ pub mod snake_case;
 use crate::prelude::*;
 use nu_errors::ShellError;
 use nu_protocol::ShellTypeName;
-use nu_protocol::{ColumnPath, Primitive, ReturnSuccess, UntaggedValue, Value};
+use nu_protocol::{ColumnPath, Primitive, UntaggedValue, Value};
 use nu_source::Tag;
 use nu_value_ext::ValueExt;
 
@@ -20,7 +20,7 @@ struct Arguments {
     column_paths: Vec<ColumnPath>,
 }
 
-pub fn operate<F>(args: CommandArgs, case_operation: &'static F) -> Result<ActionStream, ShellError>
+pub fn operate<F>(args: CommandArgs, case_operation: &'static F) -> Result<OutputStream, ShellError>
 where
     F: Fn(&str) -> String + Send + Sync + 'static,
 {
@@ -34,7 +34,7 @@ where
     Ok(input
         .map(move |v| {
             if options.column_paths.is_empty() {
-                ReturnSuccess::value(action(&v, v.tag(), &case_operation)?)
+                action(&v, v.tag(), &case_operation)
             } else {
                 let mut ret = v;
 
@@ -45,10 +45,10 @@ where
                     )?;
                 }
 
-                ReturnSuccess::value(ret)
+                Ok(ret)
             }
         })
-        .into_action_stream())
+        .into_input_stream())
 }
 
 pub fn action<F>(

crates/nu-command/src/commands/strings/str_/case/pascal_case.rs

@@ -23,7 +23,7 @@ impl WholeStreamCommand for SubCommand {
         "converts a string to PascalCase"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         operate(args, &to_pascal_case)
     }
 

crates/nu-command/src/commands/strings/str_/case/screaming_snake_case.rs

@@ -23,7 +23,7 @@ impl WholeStreamCommand for SubCommand {
         "converts a string to SCREAMING_SNAKE_CASE"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         operate(args, &to_screaming_snake_case)
     }
 

crates/nu-command/src/commands/strings/str_/case/snake_case.rs

@@ -23,7 +23,7 @@ impl WholeStreamCommand for SubCommand {
         "converts a string to snake_case"
     }
 
-    fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
+    fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
         operate(args, &to_snake_case)
     }