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package cbt
import org.scalafmt.Error.Incomplete
import org.scalafmt.Formatted
import org.scalafmt.cli.StyleCache
import org.scalafmt.config.ScalafmtConfig
import java.io.File
import java.nio.file.Files._
import java.nio.file.{ FileSystems, Path, Paths }
/**
* This plugin provides scalafmt support for cbt.
*
*/
trait Scalafmt extends BaseBuild {
/**
* Reformat scala source code according to `scalafmtConfig` rules
*
* @return always returns `ExitCode.Success`
*/
final def scalafmt: ExitCode = {
Scalafmt.format(sourceFiles, scalafmtConfig)
ExitCode.Success
}
/**
* Scalafmt formatting config.
*
* Tries to get style in following order:
* • project local .scalafmt.conf
* • global ~/.scalafmt.conf
* • default scalafmt config
*
* Override this task if you want to provide
* scalafmt config programmatically on your own.
*/
def scalafmtConfig: ScalafmtConfig =
Scalafmt.getStyle(
project = projectDirectory.toPath,
home = Option(System.getProperty("user.home")) map (p => Paths.get(p))
)
}
object Scalafmt {
def getStyle(project: Path, home: Option[Path]): ScalafmtConfig = {
val local = getConfigPath(project)
val global = home flatMap getConfigPath
val customStyle = for {
configPath <- local.orElse(global)
style <- StyleCache.getStyleForFile(configPath.toString)
} yield style
customStyle.getOrElse(ScalafmtConfig.default)
}
def format(files: Seq[File], style: ScalafmtConfig): Unit = {
var reformattedCount: Int = 0
scalaSourceFiles(files) foreach { path =>
handleFormatted(path, style) { case (original, result) =>
result match {
case Formatted.Success(formatted) =>
if (original != formatted) {
write(path, formatted.getBytes)
reformattedCount += 1
}
case Formatted.Failure(e: Incomplete) =>
System.err.println(s"Couldn't complete file reformat: $path")
case Formatted.Failure(e) =>
System.err.println(s"Failed to format file: $path, cause: ${e}")
}
}
}
if (reformattedCount > 0) System.err.println(s"Formatted $reformattedCount Scala sources")
}
private val scalaFileMatcher = FileSystems.getDefault.getPathMatcher("glob:**.scala")
private def scalaSourceFiles(files: Seq[File]): Seq[Path] = {
files collect {
case f if f.exists
&& scalaFileMatcher.matches(f.toPath) => f.toPath
}
}
private def handleFormatted[T](path: Path, style: ScalafmtConfig)(handler: (String, Formatted) => T): T = {
val original = new String(readAllBytes(path))
val result = org.scalafmt.Scalafmt.format(original, style)
handler(original, result)
}
private def getConfigPath(base: Path): Option[Path] = {
val location = base.resolve(".scalafmt.conf").toFile
Option(location.exists && location.isFile) collect {
case true => location.toPath.toAbsolutePath
}
}
}
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