Add codegen DSL

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/setting/SettingCodegen.kt

@@ -0,0 +1,11 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.codegen.setting
+

backend/codegen/src/main/kotlin/net/mamoe/mirai/console/codegen/util.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.codegen
+
+import java.io.File
+
+fun codegen(targetFile: String, regionName: String, block: StringBuilder.() -> Unit) {
+    //// region PrimitiveValue CODEGEN START ////
+    //// region PrimitiveValue CODEGEN END ////
+
+    targetFile.findFileSmart().also {
+        println("Codegen target: ${it.absolutePath}")
+    }.apply {
+        writeText(
+            readText()
+                .replace(Regex("""//// region $regionName CODEGEN START ////([\s\S]*?)//// endregion $regionName CODEGEN END ////""")) {
+                    val code = StringBuilder().apply(block).toString()
+                    """
+                        |//// region $regionName CODEGEN START ////
+                        |
+                        |$code
+                        |
+                        |//// endregion $regionName CODEGEN END ////
+                    """.trimMargin()
+                }
+        )
+    }
+}
+
+fun String.findFileSmart(): File = kotlin.run {
+    if (contains("/")) { // absolute
+        File(this)
+    } else {
+        val list = File(".").walk().filter { it.name == this }.toList()
+        if (list.isNotEmpty()) return list.single()
+
+        File(".").walk().filter { it.name.contains(this) }.single()
+    }
+}.also {
+    require(it.exists()) { "file doesn't exist" }
+}
+
+fun main() {
+    codegen("Value.kt", "PrimitiveValue") {
+
+    }
+}