Add strip margin functionality to SQL-interpolated strings

slick-testkit/src/test/scala/slick/test/jdbc/SqlActionBuilderTest.scala

@@ -0,0 +1,32 @@
+package slick.test.jdbc
+
+import org.junit.Test
+import slick.jdbc.JdbcProfile
+import org.junit.Assert._
+
+class SqlActionBuilderTest {
+
+  @Test
+  def testStripMargin: Unit = {
+    val driver = new JdbcProfile {}
+    import driver.api.actionBasedSQLInterpolation
+
+    val id = 0
+    val s1 = sql"select * from SUPPLIERS where SUP_ID = ${id}"
+    val s2 = sql"""select *
+                  |from SUPPLIERS
+                  |where SUP_ID = ${id}""".stripMargin
+    val s3 = sql"""select *
+                  !from SUPPLIERS
+                  !where SUP_ID = ${id}""".stripMargin('!')
+    val s4 = sql"""select *
+                  #from SUPPLIERS
+                  #where SUP_ID = ${id}""".stripMargin('#')
+
+    def dropNewLineChars(queryParts: Seq[Any]): Seq[Any] = queryParts.map(_.asInstanceOf[String].replace('\n', ' '))
+
+    assertEquals(s1.queryParts, dropNewLineChars(s2.queryParts))
+    assertEquals(s1.queryParts, dropNewLineChars(s3.queryParts))
+    assertEquals(s1.queryParts, dropNewLineChars(s4.queryParts))
+  }
+}

slick/src/main/scala/slick/jdbc/StaticQuery.scala

@@ -106,4 +106,7 @@ case class SQLActionBuilder(queryParts: Seq[Any], unitPConv: SetParameter[Unit])
     }
   }
   def asUpdate = as[Int](GetResult.GetUpdateValue).head
+  def stripMargin(marginChar: Char): SQLActionBuilder =
+    copy(queryParts.map(_.asInstanceOf[String].stripMargin(marginChar)))
+  def stripMargin: SQLActionBuilder = copy(queryParts.map(_.asInstanceOf[String].stripMargin))
 }