cowsay4s/settings.sc at master · guilgaly/cowsay4s · GitHub

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import coursier.Repository
import coursier.maven.MavenRepository

val customRepositories: Seq[Repository] = Seq(
  MavenRepository("https://oss.sonatype.org/content/repositories/snapshots"),
)

object scalaVersion {

  val v2_12 = "2.12.12"
  val v2_13 = "2.13.4"

  val default = v2_13
  val cross = Seq(v2_12, v2_13)
}

object scalaJsVersion {
  val default = "1.5.1"
}

/**
   * See https://tpolecat.github.io/2017/04/25/scalac-flags.html
   */
def scalacOptions(scalaVersion: String) = {

  def isCiBuild: Boolean =
    sys.env.get("CI_BUILD").exists(_.toLowerCase == "true")

  def v2_12 = Seq(
    "-encoding",
    "utf-8", // Specify character encoding used by source files.
    "-Ybackend-parallelism", // maximum worker threads for backend
    "8",
    "-explaintypes", // Explain type errors in more detail.
    "-feature", // Emit warning and location for usages of features that should be imported explicitly.
    "-unchecked", // Enable additional warnings where generated code depends on assumptions.
    "-Xcheckinit", // Wrap field accessors to throw an exception on uninitialized access.
    "-Ypartial-unification", // Enable partial unification in type constructor inference.
    "-Yno-adapted-args", // Do not adapt an argument list (either by inserting () or creating a tuple) to match the receiver.
    "-deprecation", // Emit warning and location for usages of deprecated APIs.

    // ********** -language: Enable or disable language features *****************
    // "-language:dynamics", //Allow direct or indirect subclasses of scala.Dynamic
    // "-language:existentials", // Existential types (besides wildcard types) can be written and inferred
    // "-language:higherKinds", // Allow higher-kinded types
    // "-language:implicitConversions", // Allow definition of implicit functions called views
    // "-language:postfixOps", // Allow postfix operator notation, such as 1 to 10 toList (not recommended)
    // "-language:reflectiveCalls", // Allow reflective access to members of structural types
    // "-language:experimental.macros", // Allow macro definition (besides implementation and application)

    // ********** Warning Settings ***********************************************
    // "-Xfatal-warnings", // Fail the compilation if there are any warnings.
    "-Ywarn-dead-code", // Warn when dead code is identified.
    "-Ywarn-extra-implicit", // Warn when more than one implicit parameter section is defined.
    // "-Ywarn-macros:none", // Do not inspect expansions or their original trees when generating unused symbol warnings.
    // "-Ywarn-macros:before", // Only inspect unexpanded user-written code for unused symbols. (Default)
    "-Ywarn-macros:after", // Only inspect expanded trees when generating unused symbol warnings.
    // "-Ywarn-macros:both", // Inspect both user-written code and expanded trees when generating unused symbol warnings.
    "-Ywarn-numeric-widen", // Warn when numerics are widened.
    "-Ywarn-unused:implicits", // Warn if an implicit parameter is unused.
    "-Ywarn-unused:imports", // Warn if an import selector is not referenced.
    "-Ywarn-unused:locals", // Warn if a local definition is unused.
    "-Ywarn-unused:params", // Warn if a value parameter is unused.
    "-Ywarn-unused:patvars", // Warn if a variable bound in a pattern is unused.
    "-Ywarn-unused:privates", // Warn if a private member is unused.
    "-Ywarn-value-discard", // Warn when non-Unit expression results are unused.

    // ********** -Xlint: Enable recommended warnings ****************************
    "-Xlint:adapted-args", // Warn if an argument list is modified to match the receiver.
    "-Xlint:nullary-unit", // Warn when nullary methods return Unit.
    "-Xlint:inaccessible", // Warn about inaccessible types in method signatures.
    "-Xlint:nullary-override", // Warn when non-nullary `def f()' overrides nullary `def f'.
    "-Xlint:infer-any", // Warn when a type argument is inferred to be `Any`.
    // "-Xlint:missing-interpolator", // A string literal appears to be missing an interpolator id.
    "-Xlint:doc-detached", // A Scaladoc comment appears to be detached from its element.
    "-Xlint:private-shadow", // A private field (or class parameter) shadows a superclass field.
    "-Xlint:type-parameter-shadow", // A local type parameter shadows a type already in scope.
    "-Xlint:poly-implicit-overload", // Parameterized overloaded implicit methods are not visible as view bounds.
    "-Xlint:option-implicit", // Option.apply used implicit view.
    "-Xlint:delayedinit-select", // Selecting member of DelayedInit.
    "-Xlint:package-object-classes", // Class or object defined in package object.
    "-Xlint:stars-align", // Pattern sequence wildcard must align with sequence component.
    "-Xlint:constant", // Evaluation of a constant arithmetic expression results in an error.
    "-Xlint:by-name-right-associative", // By-name parameter of right associative operator.
    "-Xlint:unsound-match", // Pattern match may not be typesafe.
  ) ++ {
    if (isCiBuild) Seq("-Xfatal-warnings") else Seq.empty
  }

  def v2_13 = Seq(
    "-encoding",
    "utf-8", // Specify character encoding used by source files.
    "-Ybackend-parallelism", // maximum worker threads for backend
    "8",
    "-explaintypes", // Explain type errors in more detail.
    "-feature", // Emit warning and location for usages of features that should be imported explicitly.
    "-unchecked", // Enable additional warnings where generated code depends on assumptions.
    "-Xcheckinit", // Wrap field accessors to throw an exception on uninitialized access.
    // "-Ymacro-annotations", // Enable support for macro annotations, formerly in macro paradise.

    // ********** -language: Enable or disable language features *****************
    // "-language:dynamics", //Allow direct or indirect subclasses of scala.Dynamic
    // "-language:existentials", // Existential types (besides wildcard types) can be written and inferred
    // "-language:higherKinds", // Allow higher-kinded types
    // "-language:implicitConversions", // Allow definition of implicit functions called views
    // "-language:postfixOps", // Allow postfix operator notation, such as 1 to 10 toList (not recommended)
    // "-language:reflectiveCalls", // Allow reflective access to members of structural types
    // "-language:experimental.macros", // Allow macro definition (besides implementation and application)

    // ********** Warning Settings ***********************************************
    // "-Werror", // Fail the compilation if there are any warnings.
    "-Wdead-code", //  Warn when dead code is identified.
    "-Wextra-implicit", // Warn when more than one implicit parameter section is defined.
    // "-Wmacros:none", // Do not inspect expansions or their original trees when generating unused symbol warnings.
    // "-Wmacros:before", // Only inspect unexpanded user-written code for unused symbols. (Default)
    "-Wmacros:after", // Only inspect expanded trees when generating unused symbol warnings.
    // "-Wmacros:both", // Inspect both user-written code and expanded trees when generating unused symbol warnings.
    "-Wnumeric-widen", // Warn when numerics are widened.
    "-Woctal-literal", // Warn on obsolete octal syntax.
    // "-Wself-implicit", // Warn when an implicit resolves to an enclosing self-definition.
    "-Wunused:imports", //Warn if an import selector is not referenced.
    "-Wunused:patvars", // Warn if a variable bound in a pattern is unused.
    "-Wunused:privates", // Warn if a private member is unused.
    "-Wunused:locals", // Warn if a local definition is unused.
    "-Wunused:explicits", // Warn if an explicit parameter is unused.
    "-Wunused:implicits", // Warn if an implicit parameter is unused.
    "-Wunused:params", // Enable -Wunused:explicits,implicits.
    "-Wvalue-discard", // Warn when non-Unit expression results are unused.

    // ********** -Xlint: Enable recommended warnings ****************************
    "-Xlint:adapted-args", // Warn if an argument list is modified to match the receiver.
    "-Xlint:nullary-unit", // Warn when nullary methods return Unit.
    "-Xlint:inaccessible", // Warn about inaccessible types in method signatures.
    "-Xlint:infer-any", // Warn when a type argument is inferred to be Any.
    // "-Xlint:missing-interpolator", // A string literal appears to be missing an interpolator id.
    "-Xlint:doc-detached", // A Scaladoc comment appears to be detached from its element.
    "-Xlint:private-shadow", // A private field (or class parameter) shadows a superclass field.
    "-Xlint:type-parameter-shadow", // A local type parameter shadows a type already in scope.
    "-Xlint:poly-implicit-overload", // Parameterized overloaded implicit methods are not visible as view bounds.
    "-Xlint:option-implicit", // Option.apply used implicit view.
    "-Xlint:delayedinit-select", // Selecting member of DelayedInit.
    "-Xlint:package-object-classes", // Class or object defined in package object.
    "-Xlint:stars-align", // Pattern sequence wildcard must align with sequence component.
    "-Xlint:constant", // Evaluation of a constant arithmetic expression results in an error.
    "-Xlint:nonlocal-return", // A return statement used an exception for flow control.
    "-Xlint:implicit-not-found", // Check @implicitNotFound and @implicitAmbiguous messages.
    "-Xlint:serial", // @SerialVersionUID on traits and non-serializable classes.
    "-Xlint:valpattern", // Enable pattern checks in val definitions.
    "-Xlint:eta-zero", // Warn on eta-expansion (rather than auto-application) of zero-ary method.
    "-Xlint:eta-sam", // Warn on eta-expansion to meet a Java-defined functional interface that is not explicitly annotated with @FunctionalInterface.
    "-Xlint:deprecation", // Enable linted deprecations.
  ) ++ {
    if (isCiBuild) Seq("-Werror") else Seq.empty
  }

  if (scalaVersion.startsWith("2.12")) v2_12
  else if (scalaVersion.startsWith("2.13")) v2_13
  else sys.error(s"No Scala compiler options defined for version $scalaVersion")
}