Scaffold Scala App in single command with optimal settings

create_scala_app

#!/usr/bin/env zsh
vared -p 'Project Name?: [hello-world] ' -c NMR_SCALA_PROJECT_NAME
vared -p 'Organization version?: [info.nmrony] ' -c NMR_SCALA_PROJECT_ORG
vared -p 'Project version?: [v1.0.0-SNAPSHOT] ' -c NMR_SCALA_PROJECT_VERSION
vared -p 'Scala version?: [2.13.1] ' -c NMR_SCALA_PROJECT_SCALA_VERSION
NMR_SCALA_PROJECT_NAME=${NMR_SCALA_PROJECT_NAME:-hello-world}
NMR_SCALA_PROJECT_ORG=${NMR_SCALA_PROJECT_ORG:-info.nmrony}
NMR_SCALA_PROJECT_VERSION=${NMR_SCALA_PROJECT_VERSION:-v1.0.0-SNAPSHOT}
NMR_SCALA_PROJECT_SCALA_VERSION=${NMR_SCALA_PROJECT_SCALA_VERSION:-2.13.1}
if [ -d "$NMR_SCALA_PROJECT_NAME" ] ; then
  echo $NMR_SCALA_PROJECT_NAME ' directory is already exists.';
else
echo -n 'Creating necessary directories and files... '
mkdir -p $NMR_SCALA_PROJECT_NAME/src/{main/{java,resources,scala},test/{java,resources,scala}}
cd $NMR_SCALA_PROJECT_NAME > /dev/null && \
cat > ./build.sbt <<-EOF
name := "$NMR_SCALA_PROJECT_NAME"
organization := "$NMR_SCALA_PROJECT_ORG"
version := "$NMR_SCALA_PROJECT_VERSION"
scalaVersion := "$NMR_SCALA_PROJECT_SCALA_VERSION"


// Library Dependencies
libraryDependencies ++= Seq(
  "org.typelevel" %% "cats-core" % "2.0.0",
  "org.scalatest" %% "scalatest" % "3.0.8" % "test"
)


// Scala Compiler Options
scalacOptions ++= Seq(
  "-deprecation",                      // Emit warning and location for usages of deprecated APIs.
  "-encoding", "utf-8",                // Specify character encoding used by source files.
  "-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.
  "-language:implicitConversions",     // Allow definition of implicit functions called views
  "-language:higherKinds",             // Allow higher-kinded types
  "-language:existentials",            // Existential types (besides wildcard types) can be written and inferred
  "-Xfatal-warnings",                  // Fail the compilation if there are any warnings.
  "-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.
)
EOF
cat > ./scalafmt.conf <<-EOF
style                           = defaultWithAlign
danglingParentheses             = true
indentOperator                  = spray
includeCurlyBraceInSelectChains = true
maxColumn                       = 120
project.excludeFilters          = [sample]
rewrite.rules                   = [RedundantParens, SortImports, PreferCurlyFors]
spaces.inImportCurlyBraces      = true
binPack.literalArgumentLists    = false
unindentTopLevelOperators       = true
EOF
mkdir -p ./project && echo 'sbt.version=1.3.3' > ./project/build.properties
cat > ./src/main/scala/HelloWorld.scala <<-EOF
object HelloWorld {
  def main(args: Array[String]): Unit = {
    println("Hello, world!")
  }
}
EOF
echo '';
echo 'To run application...' && cd ..
echo ''
echo 'cd ' $NMR_SCALA_PROJECT_NAME ' && sbt clean run'
echo ''
fi