Add basic command arguments documentation

src/framework/commands/arguments.rs

@@ -96,6 +96,38 @@ impl FromArguments for NeedyString {
     }
 }
 
+pub struct NeedyGreedyString(pub String);
+
+impl Deref for NeedyGreedyString {
+    type Target = String;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for NeedyGreedyString {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl fmt::Display for NeedyGreedyString {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl FromArguments for NeedyGreedyString {
+    fn from_args(args: &str) -> Result<(Self, &str), ArgumentParsingError> {
+        if !args.is_empty() {
+            Ok((Self(args.to_string()), ""))
+        } else {
+            Err(ArgumentParsingError::MissingArgument)
+        }
+    }
+}
+
 impl FromArguments for bool {
     fn from_args(args: &str) -> Result<(Self, &str), ArgumentParsingError> {
         let arg: &str;