Dependency inject logger and replace println

src/main/scala/db/DBService.scala

@@ -59,10 +59,10 @@ class DBService(log: Logger[IO]) {
     IO(Files.writeString(path, content))
       .redeemWith(
         error => IO(Left(error))
-//          .flatTap(_ => IO.println(s"Write file '$fileName' failed with error: ${error.getMessage}"))
+//          .flatTap(_ => log.error(s"Write file '$fileName' failed with error: ${error.getMessage}"))
         ,
         _ => IO(Right(fileName))
-//          .flatTap(_ => IO.println(s"write: $fileName"))
+//          .flatTap(_ => log.info(s"write: $fileName"))
       )
   }
 

src/main/scala/db/Main.scala

@@ -3,6 +3,7 @@ package db
 import cats.effect.IO
 import cats.effect.unsafe.implicits.global
 import cats.implicits.toTraverseOps
+import org.typelevel.log4cats.slf4j.Slf4jLogger
 
 import java.time.{LocalDate, LocalDateTime}
 import java.time.format.DateTimeFormatter
@@ -15,30 +16,32 @@ object Main {
     val to = LocalDateTime.parse("20230501_1230", dateFormatter)
 
     for {
+      log <- Slf4jLogger.create[IO]
       dbService <- DBService.of
       lines <- dbService.getInRange(from, to)
-      _ <- lines.traverse(IO.println)
+      _ <- lines.traverse(log.info(_))
     } yield ()
   }
 
   private def testGetDates: IO[Unit] = {
     for {
+      log <- Slf4jLogger.create[IO]
       dbService <- DBService.of
       dates <- dbService.getDates()
-      _ <- IO.println(dates)
+      _ <- log.info(s"$dates")
     } yield ()
   }
 
   private def testGetDate: IO[Unit] = {
     for {
+      log <- Slf4jLogger.create[IO]
       dbService <- DBService.of
-      dates <- dbService.getDateFileNames(LocalDate.of(2023, 4, 23))
-      _ <- IO.println(dates)
+      dates <- dbService.getDateFileNames(LocalDate.of(2023, 5, 15))
+      _ <- log.info(s"$dates")
     } yield ()
   }
 
   def main(args: Array[String]): Unit = {
-    println("----------------> db main")
     //    testGetInRange.unsafeRunSync()
     //    testGetDates.unsafeRunSync()
     testGetDate.unsafeRunSync()