impl basic design for #28

api/src/main/kotlin/com/mattmx/ktgui/commands/declarative/ChainCommandBuilder.kt

@@ -3,6 +3,7 @@ package com.mattmx.ktgui.commands.declarative
 import com.mattmx.ktgui.commands.declarative.arg.Argument
 import com.mattmx.ktgui.commands.declarative.arg.impl.MultiArgument
 import com.mattmx.ktgui.utils.JavaCompatibility
+import org.bukkit.block.data.type.Chain
 
 class ChainCommandBuilder(val name: String) {
     val arguments = arrayListOf<Argument<*>>()
@@ -41,6 +42,10 @@ operator fun String.div(argument: List<Argument<*>>) = ChainCommandBuilder(this)
     arguments.add(MultiArgument("multi-argument", *argument.toTypedArray()))
 }
 
+operator fun String.div(s: String) = ChainCommandBuilder(this).apply {
+    subcommands.add(DeclarativeCommandBuilder(s))
+}
+
 operator fun String.div(subs: List<DeclarativeCommandBuilder>) = ChainCommandBuilder(this).apply {
     subcommands.addAll(subs)
 }

api/src/main/kotlin/com/mattmx/ktgui/papi/Placeholder.kt

@@ -0,0 +1,12 @@
+package com.mattmx.ktgui.papi
+
+import com.mattmx.ktgui.commands.declarative.ChainCommandBuilder
+
+class Placeholder(
+    val match: ChainCommandBuilder,
+    val supplier: (PlaceholderParseContext) -> Any?
+) {
+    var priority = 0
+
+    fun parse(context: PlaceholderParseContext) = supplier.invoke(context)
+}

api/src/main/kotlin/com/mattmx/ktgui/papi/PlaceholderExpansionWrapper.kt

@@ -0,0 +1,54 @@
+package com.mattmx.ktgui.papi
+
+import me.clip.placeholderapi.expansion.PlaceholderExpansion
+import org.bukkit.entity.Player
+import org.bukkit.plugin.java.JavaPlugin
+
+class PlaceholderExpansionWrapper(
+    private val owner: JavaPlugin
+) : PlaceholderExpansion() {
+    private val placeholders = arrayListOf<Placeholder>()
+    var id = owner.name
+        private set
+    var author = owner.pluginMeta.authors.joinToString(", ")
+        private set
+    var version = owner.pluginMeta.version
+        private set
+    var splitArgs = { params: String -> params.split("_") }
+        private set
+
+    override fun getIdentifier() = id
+    override fun getAuthor() = author
+    override fun getVersion() = version
+    override fun getPlaceholders() = placeholders.map { it.toString() }.toMutableList()
+
+    infix fun id(id: String) = apply {
+        this.id = id
+    }
+
+    infix fun author(author: String) = apply {
+        this.author = author
+    }
+
+    infix fun version(version: String) = apply {
+        this.version = version
+    }
+
+    infix fun splitArgs(splitArgs: (String) -> List<String>) = apply {
+        this.splitArgs = splitArgs
+    }
+
+    infix fun registerPlaceholder(placeholder: Placeholder) = placeholders.add(placeholder)
+
+    override fun onPlaceholderRequest(player: Player?, params: String): String? {
+        val context = PlaceholderParseContext(player, splitArgs(params))
+        for (placeholder in placeholders.sortedByDescending { it.priority }) {
+            val content = placeholder.parse(context)
+
+            if (content != null) {
+                return content.toString()
+            }
+        }
+        return null
+    }
+}

api/src/main/kotlin/com/mattmx/ktgui/papi/PlaceholderParseContext.kt

@@ -0,0 +1,13 @@
+package com.mattmx.ktgui.papi
+
+import com.mattmx.ktgui.commands.declarative.arg.Argument
+import org.bukkit.entity.Player
+
+class PlaceholderParseContext(
+    val requestedBy: Player?,
+    val params: List<String>
+) {
+
+    operator fun <T : Any> Argument<T>.invoke(): T = TODO()
+
+}

api/src/main/kotlin/com/mattmx/ktgui/papi/dsl.kt

@@ -0,0 +1,13 @@
+package com.mattmx.ktgui.papi
+
+import com.mattmx.ktgui.commands.declarative.ChainCommandBuilder
+import org.bukkit.plugin.java.JavaPlugin
+
+inline fun JavaPlugin.placeholderExpansion(builder: PlaceholderExpansionWrapper.() -> Unit) =
+    PlaceholderExpansionWrapper(this).apply(builder).apply { register() }
+
+fun placeholder(string: String, supplier: PlaceholderParseContext.() -> Any?) =
+    Placeholder(ChainCommandBuilder(string), supplier)
+
+fun placeholder(chain: ChainCommandBuilder, supplier: PlaceholderParseContext.() -> Any?) =
+    Placeholder(chain, supplier)

plugin/src/main/kotlin/com/mattmx/ktgui/KotlinGui.kt

@@ -11,6 +11,8 @@ import com.mattmx.ktgui.components.screen.GuiScreen
 import com.mattmx.ktgui.cooldown.ActionCoolDown
 import com.mattmx.ktgui.designer.GuiDesigner
 import com.mattmx.ktgui.examples.*
+import com.mattmx.ktgui.papi.placeholder
+import com.mattmx.ktgui.papi.placeholderExpansion
 import com.mattmx.ktgui.scheduling.sync
 import com.mattmx.ktgui.sound.playSound
 import com.mattmx.ktgui.sound.sound
@@ -65,6 +67,16 @@ class KotlinGui : JavaPlugin() {
         )
         GuiHookExample.registerListener(this)
 
+        placeholderExpansion {
+
+            val player by playerArgument()
+
+            placeholder("ping" / player) { player().ping }
+            placeholder("ping") { requestedBy?.ping }
+            placeholder("iscool" / player) { if (player().name == author) "this player's sick" else "nah not rly" }
+
+        } id "ktgui" author "MattMX"
+
         sync {
             val cachedDesigners = hashMapOf<String, GuiDesigner>()
             rawCommand("ktgui") {