Add SteamWar CLI module

- add Clikt-based `sw` entrypoint and subcommands
- include database, user, dev, and profiler commands
- wire CLI build and CI install/release steps

CLI/src/db/Database.kt

@@ -0,0 +1,84 @@
+package de.steamwar.db
+
+import com.github.ajalt.clikt.core.BaseCliktCommand
+import com.github.ajalt.clikt.core.CliktError
+import de.steamwar.sql.SteamwarUser
+import de.steamwar.sql.SteamwarUserTable
+import org.jetbrains.exposed.v1.core.Expression
+import org.jetbrains.exposed.v1.core.Op
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.core.or
+import org.jetbrains.exposed.v1.jdbc.Database
+import org.jetbrains.exposed.v1.jdbc.JdbcTransaction
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import java.io.File
+import java.sql.ResultSet
+import java.util.Properties
+
+object Database {
+    lateinit var host: String
+    lateinit var port: String
+    lateinit var database: String
+    lateinit var db: Database
+
+    fun ensureConnected() {
+        if (::db.isInitialized) {
+            return
+        }
+        val config = File(System.getProperty("user.home"), "mysql.properties")
+
+        if (!config.exists()) {
+            throw CliktError("Config file not found!")
+        }
+
+        val props = Properties();
+
+        props.load(config.inputStream())
+
+        host = props.getProperty("host")
+        port = props.getProperty("port")
+        database = props.getProperty("database")
+
+        val username = props.getProperty("user")
+        val password = props.getProperty("password")
+
+        val url = "jdbc:mariadb://$host:$port/$database"
+
+        db = Database.connect(url, driver = "org.mariadb.jdbc.Driver", user = username, password = password)
+        return
+    }
+}
+
+fun <T: BaseCliktCommand<T>> BaseCliktCommand<T>.findUser(query: String): SteamwarUser? = transaction {
+    SteamwarUser.find { joinedOr(query.toIntOrNull()?.let { SteamwarUserTable.id eq it }, (SteamwarUserTable.username eq query), SteamwarUserTable.uuid eq query, query.toLongOrNull()?.let { SteamwarUserTable.discordId eq it }) }
+        .firstOrNull()
+        ?.let { return@transaction it }
+}
+
+fun joinedOr(vararg expressions: Expression<Boolean>?): Op<Boolean> =
+    expressions.filterNotNull().reduce { acc, expression -> acc or expression } as Op<Boolean>
+
+
+fun <T> JdbcTransaction.execute(sql: String, transform: (ResultSet) -> T): List<T> {
+    val result = mutableListOf<T>()
+    exec(sql) { rs ->
+        while (rs.next()) {
+            result += transform(rs)
+        }
+    }
+    return result
+}
+
+fun <T> JdbcTransaction.executeSingle(sql: String, transform: (ResultSet) -> T): T? {
+    return execute(sql) { rs ->
+        if (!rs.next()) {
+            return@execute null
+        }
+        transform(rs)
+    }.single()
+}
+
+fun useDb(statement: JdbcTransaction.() -> Unit) {
+    de.steamwar.db.Database.ensureConnected()
+    transaction(de.steamwar.db.Database.db, statement)
+}