initial commit

using rltk

src/melee_combat_system.rs

@@ -0,0 +1,41 @@
+use super::{gamelog::GameLog, CombatStats, Name, SufferDamage, WantsToMelee};
+use specs::prelude::*;
+
+pub struct MeleeCombatSystem {}
+
+impl<'a> System<'a> for MeleeCombatSystem {
+    type SystemData = (
+        Entities<'a>,
+        WriteExpect<'a, GameLog>,
+        WriteStorage<'a, WantsToMelee>,
+        ReadStorage<'a, Name>,
+        ReadStorage<'a, CombatStats>,
+        WriteStorage<'a, SufferDamage>,
+    );
+
+    fn run(&mut self, data: Self::SystemData) {
+        let (entities, mut log, mut wants_melee, names, combat_stats, mut inflict_damage) = data;
+
+        for (_entity, wants_melee, name, stats) in (&entities, &wants_melee, &names, &combat_stats).join() {
+            if stats.hp <= 0 {
+                break;
+            }
+            let target_stats = combat_stats.get(wants_melee.target).unwrap();
+            if target_stats.hp <= 0 {
+                break;
+            }
+
+            let target_name = names.get(wants_melee.target).unwrap();
+            let damage = i32::max(0, stats.power - target_stats.defence);
+
+            if damage == 0 {
+                log.entries.push(format!("{} is unable to hurt {}.", &name.name, &target_name.name));
+            } else {
+                log.entries.push(format!("{} hits {} for {} damage.", &name.name, &target_name.name, damage));
+                SufferDamage::new_damage(&mut inflict_damage, wants_melee.target, damage);
+            }
+        }
+
+        wants_melee.clear();
+    }
+}