add in a raw flag in the command to json (#555)

* add in the method to_string_raw

* add in a raw flag to json

* add in a test

crates/nu-json/src/lib.rs

@@ -2,7 +2,7 @@ pub use self::de::{
     from_iter, from_reader, from_slice, from_str, Deserializer, StreamDeserializer,
 };
 pub use self::error::{Error, ErrorCode, Result};
-pub use self::ser::{to_string, to_vec, to_writer, Serializer};
+pub use self::ser::{to_string, to_string_raw, to_vec, to_writer, Serializer};
 pub use self::value::{from_value, to_value, Map, Value};
 
 pub mod builder;

crates/nu-json/src/ser.rs

@@ -1023,3 +1023,16 @@ where
     let string = String::from_utf8(vec)?;
     Ok(string)
 }
+
+/// Encode the specified struct into a Hjson `String` buffer.
+/// And remove all whitespace
+#[inline]
+pub fn to_string_raw<T>(value: &T) -> Result<String>
+where
+    T: ser::Serialize,
+{
+    let vec = to_vec(value)?;
+    let mut string = String::from_utf8(vec)?;
+    string.retain(|c| !c.is_whitespace());
+    Ok(string)
+}