fix: escape quotes when string has whitespace

README.md

@@ -13,7 +13,7 @@ Generates [Nushell](https://github.com/nushell/nushell) completions for [`clap`]
 ### myapp.rs
 
 ```rust
-use clap::{Arg, ArgAction, Command};
+use clap::{builder::PossibleValue, Arg, ArgAction, Command, ValueHint};
 use clap_complete::generate;
 use clap_complete_nushell::Nushell;
 use std::io;
@@ -25,7 +25,7 @@ fn main() {
         .about("Tests completions")
         .arg(
             Arg::new("file")
-                .value_hint(clap::ValueHint::FilePath)
+                .value_hint(ValueHint::FilePath)
                 .help("some input file"),
         )
         .arg(
@@ -54,9 +54,7 @@ fn main() {
                         Arg::new("config")
                             .long("config")
                             .action(ArgAction::Set)
-                            .value_parser([clap::builder::PossibleValue::new(
-                                "Lest quotes aren't escaped.",
-                            )])
+                            .value_parser([PossibleValue::new("Lest quotes aren't escaped.")])
                             .help("the other case to test"),
                     ),
                 ),
@@ -66,7 +64,6 @@ fn main() {
 }
 ```
 
-
 ### myapp.nu
 
 ```nu
@@ -98,7 +95,7 @@ module completions {
   ]
 
   def "nu-complete myapp some_cmd sub_cmd config" [] {
-    [ "Lest quotes aren't escaped." ]
+    [ "\"Lest quotes aren't escaped.\"" ]
   }
 
   # sub-subcommand

src/lib.rs

@@ -123,7 +123,12 @@ impl<'a, 'b> Argument<'a, 'b> {
         s.push_str("\n    [");
 
         for value in &possible_values {
-            s.push_str(format!(r#" "{}""#, value.get_name()).as_str());
+            let name = value.get_name();
+            if name.contains(|c: char| c.is_whitespace()) {
+                s.push_str(format!(r#" "\"{}\"""#, name).as_str());
+            } else {
+                s.push_str(format!(r#" "{}""#, name).as_str());
+            }
         }
 
         s.push_str(" ]\n  }\n\n");

tests/snapshots/sub_subcommands.nu

@@ -26,7 +26,7 @@ module completions {
   ]
 
   def "nu-complete my-app some_cmd sub_cmd config" [] {
-    [ "Lest quotes, aren't escaped." "Second to trigger display of options" ]
+    [ "\"Lest quotes, aren't escaped.\"" "\"Second to trigger display of options\"" ]
   }
 
   # sub-subcommand