make adding newlines with to text more consistent and opt-out-able (#14158)

# Description

This PR tries to make `to text` more consistent with how it adds
newlines and also gives you an opt-out --no-newline option.

![image](https://github.com/user-attachments/assets/e4976ce6-c685-47a4-8470-4947970daf47)


I wasn't sure how to change the `PipelineData::ByteStream` match arm. I
figure something needs to be done there but I'm not sure how to do it.


# User-Facing Changes
newlines are more consistent.

# Tests + Formatting
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crates/nu-command/src/formats/to/text.rs

@@ -21,6 +21,11 @@ impl Command for ToText {
     fn signature(&self) -> Signature {
         Signature::build("to text")
             .input_output_types(vec![(Type::Any, Type::String)])
+            .switch(
+                "no-newline",
+                "Do not append a newline to the end of the text",
+                Some('n'),
+            )
             .category(Category::Formats)
     }
 
@@ -36,6 +41,7 @@ impl Command for ToText {
         input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
         let span = call.head;
+        let no_newline = call.has_flag(engine_state, stack, "no-newline")?;
         let input = input.try_expand_range()?;
         let config = stack.get_config(engine_state);
 
@@ -43,7 +49,12 @@ impl Command for ToText {
             PipelineData::Empty => Ok(Value::string(String::new(), span)
                 .into_pipeline_data_with_metadata(update_metadata(None))),
             PipelineData::Value(value, ..) => {
-                let str = local_into_string(value, LINE_ENDING, &config);
+                let is_compound_type = matches!(value, Value::List { .. } | Value::Record { .. });
+                let mut str = local_into_string(value, LINE_ENDING, &config);
+                if is_compound_type && !no_newline {
+                    str.push_str(LINE_ENDING);
+                }
+
                 Ok(
                     Value::string(str, span)
                         .into_pipeline_data_with_metadata(update_metadata(None)),
@@ -53,7 +64,9 @@ impl Command for ToText {
                 let span = stream.span();
                 let iter = stream.into_inner().map(move |value| {
                     let mut str = local_into_string(value, LINE_ENDING, &config);
+                    if !no_newline {
                         str.push_str(LINE_ENDING);
+                    }
                     str
                 });
                 Ok(PipelineData::ByteStream(
@@ -75,8 +88,13 @@ impl Command for ToText {
     fn examples(&self) -> Vec<Example> {
         vec![
             Example {
-                description: "Outputs data as simple text",
-                example: "1 | to text",
+                description: "Outputs data as simple text with a newline",
+                example: "[1] | to text",
+                result: Some(Value::test_string("1".to_string() + LINE_ENDING)),
+            },
+            Example {
+                description: "Outputs data as simple text without a newline",
+                example: "[1] | to text --no-newline",
                 result: Some(Value::test_string("1")),
             },
             Example {

crates/nu-command/tests/commands/save.rs

@@ -415,7 +415,7 @@ fn save_with_custom_converter() {
 
         nu!(cwd: dirs.test(), pipeline(
             r#"
-                def "to ndjson" []: any -> string { each { to json --raw } | to text } ;
+                def "to ndjson" []: any -> string { each { to json --raw } | to text --no-newline } ;
                 {a: 1, b: 2} | save test.ndjson
             "#
         ));