Move some code to common-plugin.

common-plugin/src/main/kotlin/gay/pizza/foundation/common/ChatExtensions.kt

@@ -0,0 +1,7 @@
+package gay.pizza.foundation.common
+
+import org.bukkit.entity.Player
+
+fun Player.chat(vararg messages: String): Unit = messages.forEach { message ->
+  chat(message)
+}

common-plugin/src/main/kotlin/gay/pizza/foundation/common/CollectionExtensions.kt

@@ -0,0 +1,8 @@
+package gay.pizza.foundation.common
+
+fun <T, R : Comparable<R>> Collection<T>.sortedBy(order: SortOrder, selector: (T) -> R?): List<T> =
+  if (order == SortOrder.Ascending) {
+    sortedBy(selector)
+  } else {
+    sortedByDescending(selector)
+  }

common-plugin/src/main/kotlin/gay/pizza/foundation/common/Platform.kt

@@ -0,0 +1,7 @@
+package gay.pizza.foundation.common
+
+object Platform {
+  private val os: String? = System.getProperty("os.name")
+
+  fun isWindows(): Boolean = os != null && os.lowercase().startsWith("windows")
+}

common-plugin/src/main/kotlin/gay/pizza/foundation/common/ServerExtensions.kt

@@ -0,0 +1,28 @@
+package gay.pizza.foundation.common
+
+import org.bukkit.Material
+import org.bukkit.OfflinePlayer
+import org.bukkit.Server
+import org.bukkit.Statistic
+import org.bukkit.entity.EntityType
+
+val Server.allPlayers: List<OfflinePlayer>
+  get() = listOf(onlinePlayers, offlinePlayers.filter { !isPlayerOnline(it) }.toList()).flatten()
+
+fun Server.isPlayerOnline(player: OfflinePlayer) =
+  onlinePlayers.any { onlinePlayer -> onlinePlayer.name == player.name }
+
+fun Server.allPlayerStatisticsOf(
+  statistic: Statistic,
+  material: Material? = null,
+  entityType: EntityType? = null,
+  order: SortOrder = SortOrder.Ascending
+) = allPlayers.map { player ->
+  player to if (material != null) {
+    player.getStatistic(statistic, material)
+  } else if (entityType != null) {
+    player.getStatistic(statistic, entityType)
+  } else {
+    player.getStatistic(statistic)
+  }
+}.sortedBy(order) { it.second }

common-plugin/src/main/kotlin/gay/pizza/foundation/common/SortOrder.kt

@@ -0,0 +1,6 @@
+package gay.pizza.foundation.common
+
+enum class SortOrder {
+  Ascending,
+  Descending
+}