feat(command): implement gamemode argument type (#2186)

* to be completed

* removed block state parser for now

* gamemode argument type

* plugin wit submodules

* fixed submodules

---------

Co-authored-by: Missing_Love <42416195+Q2297045667@users.noreply.github.com>

pumpkin/src/command/argument_types/gamemode.rs

@@ -0,0 +1,51 @@
+use crate::command::argument_types::argument_type::{ArgumentType, JavaClientArgumentType};
+use crate::command::context::command_context::CommandContext;
+use crate::command::errors::command_syntax_error::CommandSyntaxError;
+use crate::command::errors::error_types::CommandErrorType;
+use crate::command::string_reader::StringReader;
+use crate::command::suggestion::suggestions::{Suggestions, SuggestionsBuilder};
+use pumpkin_data::translation;
+use pumpkin_util::GameMode;
+use pumpkin_util::text::TextComponent;
+use std::pin::Pin;
+use std::str::FromStr;
+
+pub const INVALID_ERROR_TYPE: CommandErrorType<1> = CommandErrorType::new(
+    translation::java::ARGUMENT_GAMEMODE_INVALID,
+    translation::java::ARGUMENT_GAMEMODE_INVALID,
+);
+
+pub struct GameModeArgumentType;
+
+impl ArgumentType for GameModeArgumentType {
+    type Item = GameMode;
+
+    fn parse(&self, reader: &mut StringReader) -> Result<Self::Item, CommandSyntaxError> {
+        let string = reader.read_unquoted_string();
+        GameMode::from_str(&string)
+            .map_err(|_| INVALID_ERROR_TYPE.create(reader, TextComponent::text(string)))
+    }
+
+    fn client_side_parser(&'_ self) -> JavaClientArgumentType<'_> {
+        JavaClientArgumentType::Gamemode
+    }
+
+    fn list_suggestions<'a>(
+        &'a self,
+        _context: &'a CommandContext,
+        mut builder: SuggestionsBuilder,
+    ) -> Pin<Box<dyn Future<Output = Suggestions> + Send + 'a>> {
+        Box::pin(async move {
+            for gamemode in GameMode::VALUES {
+                builder = builder.filter_and_suggest_one(gamemode.name());
+            }
+            builder.build()
+        })
+    }
+
+    fn examples(&self) -> Vec<String> {
+        examples!("survival", "creative")
+    }
+}
+
+impl_copy_get!(GameModeArgumentType, GameMode);

pumpkin/src/command/argument_types/mod.rs

@@ -223,6 +223,7 @@ pub mod entity;
 pub mod entity_anchor;
 pub mod entity_selector;
 pub mod game_profile;
+pub mod gamemode;
 pub mod identifier;
 pub mod nbt;
 pub mod range;