add config extension

src/main/kotlin/ltd/lulz/plugin/CorePlugin.kt

@@ -1,9 +1,11 @@
 package ltd.lulz.plugin
 
+import ltd.lulz.plugin.extension.ConfigExtension
 import ltd.lulz.plugin.extension.GitExtension
 import ltd.lulz.plugin.extension.InfoExtension
 import org.gradle.api.Plugin
 import org.gradle.api.Project
+import ltd.lulz.plugin.extension.ConfigExtension.Companion.PLUGIN_NAME as CONFIG_PLUGIN_NAME
 import ltd.lulz.plugin.extension.GitExtension.Companion.PLUGIN_NAME as GIT_PLUGIN_NAME
 import ltd.lulz.plugin.extension.InfoExtension.Companion.PLUGIN_NAME as INFO_PLUGIN_NAME
 
@@ -18,8 +20,14 @@ class CorePlugin : Plugin<Project> {
     ) {
         gitExtension(project)
         infoExtension(project)
+        configExtension(project)
     }
 
+    private fun configExtension(
+        project: Project,
+    ): ConfigExtension = project.extensions
+        .create(CONFIG_PLUGIN_NAME, ConfigExtension::class.java, project)
+
     private fun infoExtension(
         project: Project,
     ): InfoExtension = project.extensions

src/main/kotlin/ltd/lulz/plugin/extension/ConfigExtension.kt

@@ -0,0 +1,31 @@
+package ltd.lulz.plugin.extension
+
+import java.lang.System.getenv
+import org.gradle.api.Project
+
+abstract class ConfigExtension(private val project: Project) {
+
+    companion object {
+        const val PLUGIN_NAME = "config"
+        const val EMPTY = ""
+    }
+
+    fun find(
+        property: String,
+        environment: String,
+    ): String? = findProperty(property) ?: findEnvironment(environment)
+
+    fun findOrDefault(
+        property: String,
+        environment: String,
+        default: String = EMPTY,
+    ): String = findProperty(property) ?: findEnvironment(environment) ?: default
+
+    private fun findProperty(
+        property: String,
+    ) = project.findProperty(property)?.toString()
+
+    private fun findEnvironment(
+        environment: String,
+    ): String? = getenv(environment)
+}