Trim (#52)

Add a simple trim command

src/cli.rs

@@ -56,6 +56,7 @@ pub async fn cli() -> Result<(), Box<Error>> {
             command("split-row", split_row::split_row),
             command("reject", reject::reject),
             command("select", select::select),
+            command("trim", trim::trim),
             command("to-array", to_array::to_array),
             command("to-json", to_json::to_json),
             Arc::new(Where),

src/commands.rs

@@ -17,6 +17,7 @@ crate mod split_row;
 crate mod take;
 crate mod to_array;
 crate mod to_json;
+crate mod trim;
 crate mod view;
 crate mod where_;
 

src/commands/trim.rs

@@ -0,0 +1,18 @@
+use crate::errors::ShellError;
+use crate::object::{Primitive, Value};
+use crate::prelude::*;
+
+// TODO: "Amount remaining" wrapper
+
+pub fn trim(args: CommandArgs) -> Result<OutputStream, ShellError> {
+    let input = args.input;
+
+    Ok(input
+        .map(move |v| match v {
+            Value::Primitive(Primitive::String(s)) => {
+                ReturnValue::Value(Value::Primitive(Primitive::String(s.trim().to_string())))
+            }
+            x => ReturnValue::Value(x),
+        })
+        .boxed())
+}