Initial features

.gitignore

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+.idea/
+.gradle/
+build/
+run/

build.gradle.kts

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+import net.minecrell.pluginyml.bukkit.BukkitPluginDescription
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+    kotlin("jvm") version "1.7.0-RC"
+    id("com.github.johnrengelman.shadow") version "7.1.2"
+    id("io.papermc.paperweight.userdev") version "1.3.5"
+    id("xyz.jpenilla.run-paper") version "1.0.6" // Adds runServer and runMojangMappedServer tasks for testing
+    id("net.minecrell.plugin-yml.bukkit") version "0.5.1"
+}
+
+val projectGroup: String by project
+val projectVersion: String by project
+val mainPackage: String by project
+val mainClass: String by project
+
+val paperVersion: String by project
+val acfVersion: String by project
+val dlibVersion: String by project
+
+group = projectGroup
+version = projectVersion
+
+repositories {
+    mavenLocal()
+    mavenCentral()
+
+    maven("https://papermc.io/repo/repository/maven-public/")
+    maven("https://repo.aikar.co/content/groups/aikar/")
+}
+
+dependencies {
+    paperDevBundle(paperVersion)
+
+    implementation("co.aikar:acf-paper:$acfVersion")
+    implementation("nl.kallestruik:DLib:$dlibVersion")
+
+    implementation("org.jetbrains.kotlin:kotlin-scripting-common")
+    implementation("org.jetbrains.kotlin:kotlin-scripting-jvm")
+    implementation("org.jetbrains.kotlin:kotlin-scripting-jvm-host")
+
+    testImplementation(kotlin("test"))
+}
+
+// Use KSP Generated sources
+sourceSets.main {
+    java.srcDirs("build/generated/ksp/main/kotlin")
+}
+
+
+tasks {
+    test {
+        useJUnitPlatform()
+    }
+
+    withType<JavaCompile> {
+        options.compilerArgs.add("-parameters")
+        options.isFork = true
+        options.forkOptions.executable = "javac"
+
+        options.encoding = Charsets.UTF_8.name() // We want UTF-8 for everything
+
+        // Set the release flag. This configures what version bytecode the compiler will emit, as well as what JDK APIs are usable.
+        // See https://openjdk.java.net/jeps/247 for more information.
+        options.release.set(17)
+    }
+
+    withType<KotlinCompile> {
+        kotlinOptions.jvmTarget = "1.8"
+        kotlinOptions.javaParameters = true
+    }
+
+    shadowJar {
+        relocate("co.aikar.commands", "$mainPackage.acf")
+        relocate("co.aikar.locales", "$mainPackage.locales")
+    }
+
+    withType<Javadoc> {
+        options.encoding = Charsets.UTF_8.name() // We want UTF-8 for everything
+    }
+
+    processResources {
+        filteringCharset = Charsets.UTF_8.name() // We want UTF-8 for everything
+    }
+
+    assemble {
+        dependsOn(reobfJar)
+    }
+}
+
+
+// Configure plugin.yml generation
+bukkit {
+    load = BukkitPluginDescription.PluginLoadOrder.STARTUP
+    main = "$mainPackage.$mainClass"
+    apiVersion = "1.18"
+    authors = listOf("Kalle \"dragontamerfred\" Struik")
+    commands {
+        register("ditems")
+    }
+}

gradle.properties

@@ -0,0 +1,10 @@
+kotlin.code.style=official
+projectGroup=nl.kallestruik
+projectName=DItems
+projectVersion=1.0
+mainPackage=nl.kallestruik.ditems
+mainClass=DItems
+
+paperVersion=1.18.2-R0.1-SNAPSHOT
+acfVersion=0.5.1-SNAPSHOT
+dlibVersion=1.5.0

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1,9 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        maven("https://papermc.io/repo/repository/maven-public/")
+    }
+}
+
+rootProject.name = "DItems"
+

src/main/kotlin/nl/kallestruik/ditems/CommandDItems.kt

@@ -0,0 +1,24 @@
+package nl.kallestruik.ditems
+
+import co.aikar.commands.BaseCommand
+import co.aikar.commands.annotation.CommandAlias
+import co.aikar.commands.annotation.Single
+import co.aikar.commands.annotation.Subcommand
+import org.bukkit.command.CommandSender
+import org.bukkit.entity.Player
+
+@CommandAlias("ditems")
+class CommandDItems: BaseCommand() {
+    @Subcommand("give")
+    fun onGive(player: Player, @Single id: String) {
+        val item = ItemManager.items[id]?.createItemStack() ?: return
+
+        player.inventory.addItem(item)
+    }
+
+    @Subcommand("reload")
+    fun onReload(sender: CommandSender) {
+        ItemManager.items.clear()
+        ItemManager.loadItems(sender)
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/DItems.kt

@@ -0,0 +1,22 @@
+package nl.kallestruik.ditems
+
+import co.aikar.commands.PaperCommandManager
+import org.bukkit.plugin.java.JavaPlugin
+
+class DItems: JavaPlugin() {
+    private lateinit var commandManager: PaperCommandManager
+
+    override fun onEnable() {
+        commandManager = PaperCommandManager(this).also {
+            it.enableUnstableAPI("brigadier")
+            it.enableUnstableAPI("help")
+        }
+
+        commandManager.registerCommand(CommandDItems())
+
+        ItemManager.setup(this)
+        ItemManager.loadItems()
+
+        server.pluginManager.registerEvents(EventListener(this), this)
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/EventListener.kt

@@ -0,0 +1,69 @@
+package nl.kallestruik.ditems
+
+import nl.kallestruik.ditems.dsl.item.OnBreakBlock
+import nl.kallestruik.ditems.dsl.item.OnInventoryClick
+import nl.kallestruik.ditems.dsl.item.OnRightClick
+import org.bukkit.block.Block
+import org.bukkit.event.EventHandler
+import org.bukkit.event.Listener
+import org.bukkit.event.block.Action
+import org.bukkit.event.block.BlockBreakEvent
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.event.player.PlayerInteractEvent
+import java.util.*
+
+class EventListener(
+    private val plugin: DItems,
+): Listener {
+
+    @EventHandler
+    fun onBreakBlock(event: BlockBreakEvent) {
+        val item = event.player.inventory.itemInMainHand
+        val customItem = ItemManager.getCustomItem(item) ?: return
+
+        val lastTwoTargetBlocks: List<Block> = event.player.getLastTwoTargetBlocks(null, 7)
+        if (lastTwoTargetBlocks.size != 2 || !lastTwoTargetBlocks[1].type.isOccluding) return
+
+        val targetBlock: Block = lastTwoTargetBlocks[1]
+        val adjacentBlock: Block = lastTwoTargetBlocks[0]
+
+        val face = targetBlock.getFace(adjacentBlock) ?: return
+
+        // Make sure we don't break blocks other than the one that we intended
+        if (targetBlock != event.block) return
+
+        OnBreakBlock(event, event.block.location, face, item, customItem, plugin).apply(customItem.onBreakBlock)
+    }
+
+    @EventHandler
+    fun onInventoryInteract(event: InventoryClickEvent) {
+        val cursor = event.cursor
+        val clicked = event.currentItem
+
+        val cursorCustomItem = cursor?.let { ItemManager.getCustomItem(it) }
+        if (cursorCustomItem != null)
+            OnInventoryClick(event, cursor, cursorCustomItem, clicked, plugin).apply(cursorCustomItem.onInventoryClick)
+
+        val clickedCustomItem = clicked?.let { ItemManager.getCustomItem(it) }
+        if (clickedCustomItem != null)
+            OnInventoryClick(event, clicked, clickedCustomItem, cursor, plugin).apply(clickedCustomItem.onInventoryClick)
+    }
+
+    @EventHandler
+    fun onRightClick(event: PlayerInteractEvent) {
+        if (!(event.action == Action.RIGHT_CLICK_AIR || event.action == Action.RIGHT_CLICK_BLOCK)) return
+
+        val item = event.player.inventory.getItem(event.hand ?: return)
+
+        val customItem = ItemManager.getCustomItem(item) ?: return
+
+        if (isOnCooldown(event.player.uniqueId, customItem)) return
+
+        OnRightClick(event, event.player, item, customItem, plugin).apply(customItem.onRightClick)
+    }
+
+    fun isOnCooldown(uuid: UUID, item: Item): Boolean {
+        val cooldown = ItemManager.itemCooldowns[Pair(uuid, item.id)] ?: return false
+        return System.currentTimeMillis() - cooldown.start < cooldown.length
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/Item.kt

@@ -0,0 +1,45 @@
+package nl.kallestruik.ditems
+
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.format.TextDecoration
+import nl.kallestruik.ditems.dsl.item.ItemAttribute
+import nl.kallestruik.ditems.dsl.item.OnBreakBlock
+import nl.kallestruik.ditems.dsl.item.OnInventoryClick
+import nl.kallestruik.ditems.dsl.item.OnRightClick
+import nl.kallestruik.ditems.dsl.exceptions.InvalidItemException
+import org.bukkit.Material
+import org.bukkit.attribute.AttributeModifier
+import org.bukkit.inventory.ItemStack
+import org.bukkit.persistence.PersistentDataType
+import java.util.*
+
+data class Item(
+    val id: String,
+    val name: Component,
+    val baseItem: Material,
+    val onBreakBlock: OnBreakBlock.() -> Unit = {},
+    val onInventoryClick: OnInventoryClick.() -> Unit = {},
+    val onRightClick: OnRightClick.() -> Unit = {},
+    val finalizeItemStack: ItemStack.() -> Unit = {},
+    val attributes: List<ItemAttribute> = emptyList(),
+) {
+    fun createItemStack(): ItemStack {
+        val stack = ItemStack(baseItem)
+        stack.editMeta {
+            it.persistentDataContainer.set(ItemManager.ITEM_ID_KEY, PersistentDataType.STRING, id)
+
+            it.displayName(Component.empty().decoration(TextDecoration.ITALIC, false).append(name))
+
+            it.attributeModifiers = null
+
+            for (attribute in attributes) {
+                if (attribute.attribute == null)
+                    throw InvalidItemException("Attributes need to at least have a attribute defined!")
+
+                it.addAttributeModifier(attribute.attribute!!, AttributeModifier(UUID.randomUUID(), attribute.name, attribute.value, attribute.operation, attribute.slot))
+            }
+        }
+
+        return stack.apply(finalizeItemStack)
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/ItemCooldown.kt

@@ -0,0 +1,6 @@
+package nl.kallestruik.ditems
+
+data class ItemCooldown(
+    val start: Long,
+    val length: Long,
+)

src/main/kotlin/nl/kallestruik/ditems/ItemManager.kt

@@ -0,0 +1,90 @@
+package nl.kallestruik.ditems
+
+import net.kyori.adventure.text.Component
+import net.kyori.adventure.text.format.NamedTextColor
+import net.kyori.adventure.text.format.TextColor
+import nl.kallestruik.ditems.script.DItemsScriptHost
+import org.bukkit.Bukkit
+import org.bukkit.NamespacedKey
+import org.bukkit.command.CommandSender
+import org.bukkit.inventory.ItemStack
+import org.bukkit.persistence.PersistentDataType
+import java.io.File
+import java.util.*
+import kotlin.script.experimental.api.ScriptDiagnostic
+
+object ItemManager {
+    val items: MutableMap<String, Item> = mutableMapOf()
+    val itemCooldowns: MutableMap<Pair<UUID, String>, ItemCooldown> = mutableMapOf()
+
+    private lateinit var scriptFolder: File
+    lateinit var ITEM_ID_KEY: NamespacedKey
+
+    fun setup(plugin: DItems) {
+        this.scriptFolder = File(plugin.dataFolder, "items")
+        this.scriptFolder.mkdirs()
+
+        ITEM_ID_KEY = NamespacedKey(plugin, "custom_item_id")
+    }
+
+    private fun colorForSeverity(severity: ScriptDiagnostic.Severity): TextColor {
+        return when (severity) {
+            ScriptDiagnostic.Severity.DEBUG -> NamedTextColor.GRAY
+            ScriptDiagnostic.Severity.INFO -> NamedTextColor.BLUE
+            ScriptDiagnostic.Severity.WARNING -> NamedTextColor.YELLOW
+            ScriptDiagnostic.Severity.ERROR -> NamedTextColor.RED
+            ScriptDiagnostic.Severity.FATAL -> NamedTextColor.DARK_RED
+        }
+    }
+
+    fun loadItems(logTarget: CommandSender = Bukkit.getServer().consoleSender) {
+        val loadStartTime = System.nanoTime()
+
+        val scriptFiles = scriptFolder
+            .listFiles()
+            ?.filter { it.isFile }
+            ?.filter { it.name.endsWith(".ditems.kts") }
+            ?: listOf()
+
+        val reports = scriptFiles
+            .flatMap { DItemsScriptHost.evalFile(it) }
+
+        reports
+            .filter { it.severity > ScriptDiagnostic.Severity.DEBUG }
+            .forEach {
+                logTarget.sendMessage(
+                    Component.empty()
+                        .append(Component.text("[${it.severity.name}] ").color(colorForSeverity(it.severity)))
+                        .append(Component.text("(${it.sourcePath}: ${it.location?.start?.line}) "))
+                        .append(Component.text(it.message))
+                )
+            }
+
+        val loadTime = System.nanoTime() - loadStartTime
+        val loadTimeString = "%.1f".format(loadTime / 1000000000.0)
+
+        logTarget.sendMessage(Component.empty()
+            .append(Component.text("[DItems] ").color(NamedTextColor.GOLD))
+            .append(Component.empty().color(NamedTextColor.YELLOW)
+                .append(Component.text("Loaded "))
+                .append(Component.text(items.size).color(NamedTextColor.AQUA))
+                .append(Component.text(" items in "))
+                .append(Component.empty().color(NamedTextColor.AQUA)
+                    .append(Component.text(loadTimeString))
+                    .append(Component.text("s"))
+                )
+            )
+        )
+    }
+
+    fun getCustomItem(stack: ItemStack): Item? {
+        val meta = stack.itemMeta ?: return null
+        val dataContainer = meta.persistentDataContainer
+        if (!dataContainer.has(ITEM_ID_KEY))
+            return null
+
+        val id = dataContainer.get(ITEM_ID_KEY, PersistentDataType.STRING) ?: return null
+
+        return items[id]
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/dsl/exceptions/InvalidItemException.kt

@@ -0,0 +1,3 @@
+package nl.kallestruik.ditems.dsl.exceptions
+
+class InvalidItemException(override val message: String?): RuntimeException(message)

src/main/kotlin/nl/kallestruik/ditems/dsl/item/ItemAttribute.kt

@@ -0,0 +1,13 @@
+package nl.kallestruik.ditems.dsl.item
+
+import org.bukkit.attribute.Attribute
+import org.bukkit.attribute.AttributeModifier
+import org.bukkit.inventory.EquipmentSlot
+
+data class ItemAttribute(
+    var attribute: Attribute? = null,
+    var value: Double = 0.0,
+    var name: String = "",
+    var operation: AttributeModifier.Operation = AttributeModifier.Operation.ADD_NUMBER,
+    var slot: EquipmentSlot? = null,
+)

src/main/kotlin/nl/kallestruik/ditems/dsl/item/ItemBuilder.kt

@@ -0,0 +1,59 @@
+package nl.kallestruik.ditems.dsl.item
+
+import net.kyori.adventure.text.Component
+import nl.kallestruik.ditems.Item
+import nl.kallestruik.ditems.ItemManager
+import nl.kallestruik.ditems.dsl.exceptions.InvalidItemException
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+
+fun item(config: ItemBuilder.() -> Unit): Item {
+    val item = ItemBuilder().apply(config).build()
+    ItemManager.items[item.id] = item
+
+    return item
+}
+
+class ItemBuilder {
+    var id: String? = null
+    var name: Component? = null
+    var baseItem: Material = Material.AIR
+    private var onBreakBlock: OnBreakBlock.() -> Unit = {}
+    private var onInventoryClick: OnInventoryClick.() -> Unit = {}
+    private var onRightClick: OnRightClick.() -> Unit = {}
+    private var finalizeItemStack: ItemStack.() -> Unit = {}
+    private val attributes = mutableListOf<ItemAttribute>()
+
+    fun onBreakBlock(onBreak: OnBreakBlock.() -> Unit) {
+        this.onBreakBlock = onBreak
+    }
+
+    fun onInventoryClick(onInventoryClick: OnInventoryClick.() -> Unit) {
+        this.onInventoryClick = onInventoryClick
+    }
+
+    fun onRightClick(onRightClick: OnRightClick.() -> Unit) {
+        this.onRightClick = onRightClick
+    }
+
+    fun finalizeItemStack(finalizeItemStack: ItemStack.() -> Unit) {
+        this.finalizeItemStack = finalizeItemStack
+    }
+
+    fun attribute(itemAttribute: ItemAttribute.() -> Unit) {
+        attributes += ItemAttribute().apply(itemAttribute)
+    }
+
+    fun build(): Item {
+        return Item(
+            id = id ?: throw InvalidItemException("An item needs to have an id!"),
+            name = name  ?: throw InvalidItemException("An item needs to have a name!"),
+            baseItem = baseItem,
+            onBreakBlock = onBreakBlock,
+            onInventoryClick = onInventoryClick,
+            onRightClick = onRightClick,
+            finalizeItemStack = finalizeItemStack,
+            attributes = attributes,
+        )
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/dsl/item/OnBreakBlock.kt

@@ -0,0 +1,25 @@
+package nl.kallestruik.ditems.dsl.item
+
+import nl.kallestruik.ditems.Item
+import org.bukkit.Location
+import org.bukkit.block.BlockFace
+import org.bukkit.event.block.BlockBreakEvent
+import org.bukkit.inventory.ItemStack
+import org.bukkit.plugin.java.JavaPlugin
+
+class OnBreakBlock(
+    val event: BlockBreakEvent,
+    val pos: Location,
+    val face: BlockFace,
+    val itemStack: ItemStack,
+    val item: Item,
+    val plugin: JavaPlugin,
+) {
+    fun breakBlock(pos: Location) {
+        pos.world.getBlockAt(pos).breakNaturally(itemStack)
+    }
+
+    fun relative(x: Int, y: Int, z: Int): Location {
+        return pos.clone().add(x.toDouble(), y.toDouble(), z.toDouble())
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/dsl/item/OnInventoryClick.kt

@@ -0,0 +1,14 @@
+package nl.kallestruik.ditems.dsl.item
+
+import nl.kallestruik.ditems.Item
+import org.bukkit.event.inventory.InventoryClickEvent
+import org.bukkit.inventory.ItemStack
+import org.bukkit.plugin.java.JavaPlugin
+
+class OnInventoryClick(
+    val event: InventoryClickEvent,
+    val itemStack: ItemStack,
+    val item: Item,
+    val other: ItemStack?,
+    val plugin: JavaPlugin,
+)

src/main/kotlin/nl/kallestruik/ditems/dsl/item/OnRightClick.kt

@@ -0,0 +1,56 @@
+package nl.kallestruik.ditems.dsl.item
+
+import nl.kallestruik.ditems.Item
+import nl.kallestruik.ditems.ItemCooldown
+import nl.kallestruik.ditems.ItemManager
+import org.bukkit.Location
+import org.bukkit.entity.*
+import org.bukkit.event.player.PlayerInteractEvent
+import org.bukkit.inventory.ItemStack
+import org.bukkit.plugin.java.JavaPlugin
+
+class OnRightClick(
+    val event: PlayerInteractEvent,
+    val player: Player,
+    val itemStack: ItemStack,
+    val item: Item,
+    val plugin: JavaPlugin,
+) {
+    fun summon(where: Location, type: EntityType): Entity {
+        return player.world.spawn(where, type.entityClass!!)
+    }
+
+    fun shoot(where: Location, type: EntityType, speed: Double): Projectile {
+        val projectile = summon(where, type) as Projectile
+        projectile.velocity = player.location.direction.clone().normalize().multiply(speed)
+        projectile.shooter = player
+        return projectile
+    }
+
+    fun fireball(where: Location, type: EntityType): Fireball {
+        val fireball = shoot(where, type, 0.0) as Fireball
+        fireball.direction = player.location.direction.clone().normalize()
+        return fireball
+    }
+
+    fun relative(x: Double, y: Double, z: Double): Location {
+        return player.location.relative(x, y, z)
+    }
+
+    fun forward(amount: Double): Location {
+        return player.eyeLocation.forward(amount)
+    }
+
+    private fun Location.relative(x: Double, y: Double, z: Double): Location {
+        return this.clone().add(x, y, z)
+    }
+
+    private fun Location.forward(amount: Double): Location {
+        return this.clone().add(player.location.direction.clone().normalize().multiply(amount))
+    }
+
+    fun cooldown(ticks: Int) {
+        player.setCooldown(item.baseItem, ticks)
+        ItemManager.itemCooldowns[Pair(player.uniqueId, item.id)] = ItemCooldown(System.currentTimeMillis(), ticks * 50L)
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/dsl/recipe/RecipeBuilder.kt

@@ -0,0 +1,21 @@
+package nl.kallestruik.ditems.dsl.recipe
+
+import org.bukkit.inventory.ShapedRecipe
+
+fun shapedRecipe(config: ShapedRecipeBuilder.() -> Unit): ShapedRecipe {
+    val recipe = ShapedRecipeBuilder().apply(config).build()
+    //TODO: Store in recipe manager. And make it.
+
+    return recipe
+}
+
+class ShapedRecipeBuilder {
+
+
+    fun build(): ShapedRecipe {
+        //TODO: Get result item in some way. Both vanilla item stacks and custom items need to be supported.
+//        val recipe = ShapedRecipe()
+
+        TODO()
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/script/DItemsScript.kt

@@ -0,0 +1,71 @@
+package nl.kallestruik.ditems.script
+
+import net.kyori.adventure.text.Component
+import org.bukkit.Material
+import org.bukkit.attribute.Attribute
+import org.bukkit.entity.EntityType
+import org.bukkit.inventory.EquipmentSlot
+import java.io.File
+import kotlin.script.experimental.annotations.KotlinScript
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.host.FileBasedScriptSource
+import kotlin.script.experimental.host.FileScriptSource
+import kotlin.script.experimental.jvm.dependenciesFromCurrentContext
+import kotlin.script.experimental.jvm.jvm
+
+@KotlinScript(
+    // File extension for the script type
+    fileExtension = "ditems.kts",
+    // Compilation configuration for the script type
+    compilationConfiguration = DItemsScriptConfiguration::class
+)
+abstract class DItemsScript
+
+/**
+ * Import other script(s)
+ */
+@Target(AnnotationTarget.FILE)
+@Repeatable
+@Retention(AnnotationRetention.SOURCE)
+annotation class Import(vararg val paths: String)
+
+
+object DItemsScriptConfiguration: ScriptCompilationConfiguration({
+    jvm {
+        defaultImports(Material::class, EntityType::class, Component::class, Attribute::class, EquipmentSlot::class)
+        defaultImports("nl.kallestruik.ditems.dsl.item.item")
+
+        refineConfiguration {
+            onAnnotations(Import::class, handler = DItemsScriptConfigurator())
+        }
+
+        // Extract the whole classpath from context classloader and use it as dependencies
+        dependenciesFromCurrentContext(wholeClasspath = true)
+
+        ide {
+            acceptedLocations(ScriptAcceptedLocation.Everywhere)
+        }
+    }
+})
+
+
+class DItemsScriptConfigurator : RefineScriptCompilationConfigurationHandler {
+    override operator fun invoke(context: ScriptConfigurationRefinementContext): ResultWithDiagnostics<ScriptCompilationConfiguration> =
+        processAnnotations(context)
+
+    private fun processAnnotations(context: ScriptConfigurationRefinementContext): ResultWithDiagnostics<ScriptCompilationConfiguration> {
+        val annotations = context.collectedData?.get(ScriptCollectedData.foundAnnotations)?.takeIf { it.isNotEmpty() }
+            ?: return context.compilationConfiguration.asSuccess()
+
+        val scriptBaseDir = (context.script as? FileBasedScriptSource)?.file?.parentFile
+        val importedSources = annotations.flatMap {
+            (it as? Import)?.paths?.map { sourceName ->
+                FileScriptSource(scriptBaseDir?.resolve(sourceName) ?: File(sourceName))
+            } ?: emptyList()
+        }
+
+        return ScriptCompilationConfiguration(context.compilationConfiguration) {
+            if (importedSources.isNotEmpty()) importScripts.append(importedSources)
+        }.asSuccess()
+    }
+}

src/main/kotlin/nl/kallestruik/ditems/script/DItemsScriptHost.kt

@@ -0,0 +1,33 @@
+package nl.kallestruik.ditems.script
+
+import nl.kallestruik.ditems.DItems
+import java.io.File
+import kotlin.script.experimental.api.ScriptDiagnostic
+import kotlin.script.experimental.host.toScriptSource
+import kotlin.script.experimental.jvm.baseClassLoader
+import kotlin.script.experimental.jvm.dependenciesFromCurrentContext
+import kotlin.script.experimental.jvm.jvm
+import kotlin.script.experimental.jvmhost.BasicJvmScriptingHost
+import kotlin.script.experimental.jvmhost.createJvmCompilationConfigurationFromTemplate
+import kotlin.script.experimental.jvmhost.createJvmEvaluationConfigurationFromTemplate
+
+object DItemsScriptHost {
+
+    fun evalFile(scriptFile: File): List<ScriptDiagnostic> {
+        val compilationConfiguration = createJvmCompilationConfigurationFromTemplate<DItemsScript> {
+            jvm {
+                // Script will have access to everything in the classpath
+                dependenciesFromCurrentContext(wholeClasspath = true)
+            }
+        }
+
+        val evaluationConfiguration = createJvmEvaluationConfigurationFromTemplate<DItemsScript> {
+            jvm {
+                baseClassLoader.put(DItems::class.java.classLoader)
+            }
+        }
+
+        val result = BasicJvmScriptingHost().eval(scriptFile.toScriptSource(), compilationConfiguration, evaluationConfiguration)
+        return result.reports
+    }
+}