add difficulty

src/command/difficulty.rs

@@ -0,0 +1,19 @@
+#[derive(Default)]
+pub struct DifficultyCommand {
+    difficulty: Option<super::Difficulty>
+}
+
+impl DifficultyCommand {
+    pub fn difficulty(mut self, difficulty: super::Difficulty) -> Self {
+        self.difficulty = Some(difficulty);
+        self
+    }
+
+    pub fn build(self) -> super::Command {
+        let mut s = format!("difficulty");
+        if let Some(difficulty) = self.difficulty {
+            s.push_str(&format!(" {difficulty}"))
+        };
+        super::Command(s)
+    }
+}

src/command/mod.rs

@@ -44,6 +44,24 @@ impl Display for Gamemode {
     }
 }
 
+pub enum Difficulty {
+    Peaceful,
+    Easy,
+    Normal,
+    Hard
+}
+
+impl Display for Difficulty {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Peaceful => write!(f, "peaceful"),
+            Self::Easy => write!(f, "easy"),
+            Self::Normal => write!(f, "normal"),
+            Self::Hard => write!(f, "hard")
+        }
+    }
+}
+
 mod say;
 mod list;
 mod kill;
@@ -52,6 +70,7 @@ mod banlist;
 mod defaultgamemode;
 mod op;
 mod deop;
+mod difficulty;
 
 impl Command {
     pub fn raw(cmd: &str) -> Self {
@@ -93,4 +112,8 @@ impl Command {
     pub fn deop() -> deop::DeopCommand {
         deop::DeopCommand::default()
     }
+
+    pub fn difficulty() -> difficulty::DifficultyCommand {
+        difficulty::DifficultyCommand::default()
+    }
 }