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package ammonite.interp
import java.io.{File, OutputStream, PrintStream}
import java.util.regex.Pattern
import ammonite.compiler.iface.{
CodeWrapper,
CompilerBuilder,
CompilerLifecycleManager,
Parser,
Preprocessor
}
import ammonite.interp.api.{InterpAPI, InterpLoad, LoadJar, ScalaVersion}
import scala.collection.mutable
import ammonite.runtime._
import annotation.tailrec
import ammonite.runtime.tools.IvyThing
import ammonite.util.Util._
import ammonite.util.{Frame => _, _}
import coursierapi.{Dependency, Fetch, Repository}
/**
* A convenient bundle of all the functionality necessary
* to interpret Scala code. Doesn't attempt to provide any
* real encapsulation for now.
*/
class Interpreter(val compilerBuilder: CompilerBuilder,
// by-name, so that fastparse isn't loaded when we don't need it
parser: () => Parser,
getFrame: () => Frame,
val createFrame: () => Frame,
replCodeWrapper: CodeWrapper,
val scriptCodeWrapper: CodeWrapper,
parameters: Interpreter.Parameters = Interpreter.Parameters())
extends ImportHook.InterpreterInterface{ interp =>
import parameters._
def headFrame = getFrame()
val repositories = Ref(ammonite.runtime.tools.IvyThing.defaultRepositories)
val resolutionHooks = mutable.Buffer.empty[Fetch => Fetch]
val mainThread = Thread.currentThread()
def evalClassloader = headFrame.classloader
def pluginClassloader = headFrame.pluginClassloader
def handleImports(i: Imports) = headFrame.addImports(i)
def frameImports = headFrame.imports
def frameUsedEarlierDefinitions = headFrame.usedEarlierDefinitions
def scalaVersion = compilerBuilder.scalaVersion
def dependencyComplete: String => (Int, Seq[String]) =
IvyThing.completer(repositories(), verbose = verboseOutput)
val compilerManager = compilerBuilder.newManager(
storage.dirOpt.map(_.toNIO),
headFrame,
Some(dependencyComplete),
classPathWhitelist,
Option(initialClassLoader).getOrElse(headFrame.classloader)
)
val eval = Evaluator(headFrame)
private var scriptImportCallback: Imports => Unit = handleImports
val watchedValues = mutable.Buffer.empty[(Watchable, Long)]
// We keep an *in-memory* cache of scripts, in additional to the global
// filesystem cache shared between processes. This is because the global
// cache is keyed on (script, env), but you can load the same script multiple
// times in the same process (e.g. via a diamond dependency graph) and each
// time it will have a different `env. Despite this, we want to ensure we
// do not compile/load/run the same script more than once in the same
// process, so we cache it based on the source of the code and return the
// same result every time it gets run in the same process
val alreadyLoadedFiles = mutable.Map.empty[CodeSource, ScriptOutput.Metadata]
val beforeExitHooks = mutable.Buffer.empty[Any => Any]
def compilationCount = compilerManager.compilationCount
private val dependencyLoader = new DependencyLoader(
printer,
storage,
alreadyLoadedDependencies,
verboseOutput
)
// Use a var and callbacks instead of a fold, because when running
// `processModule0` user code may end up calling `processModule` which depends
// on `predefImports`, and we should be able to provide the "current" imports
// to it even if it's half built
var predefImports = Imports()
// Needs to be run after the Interpreter has been instantiated, as some of the
// ReplAPIs available in the predef need access to the Interpreter object
def initializePredef(
basePredefs: Seq[PredefInfo],
customPredefs: Seq[PredefInfo],
// Allows you to set up additional "bridges" between the REPL
// world and the outside world, by passing in the full name
// of the `APIHolder` object that will hold the bridge and
// the object that will be placed there. Needs to be passed
// in as a callback rather than run manually later as these
// bridges need to be in place *before* the predef starts
// running, so you can use them predef to e.g. configure
// the REPL before it starts
extraBridges: Seq[(String, String, AnyRef)],
baseImports: Imports = Interpreter.predefImports
): Option[(Res.Failing, Seq[(Watchable, Long)])] = {
headFrame.classloader.specialLocalClasses ++= Seq(
"ammonite.interp.api.InterpBridge",
"ammonite.interp.api.InterpBridge$"
)
headFrame.classloader.specialLocalClasses ++= extraBridges
.map(_._1)
.flatMap(c => Seq(c, c + "$"))
val bridgeImports = PredefInitialization.initBridges(
("ammonite.interp.api.InterpBridge", "interp", interpApi) +: extraBridges,
evalClassloader
)
predefImports = predefImports ++ bridgeImports ++ baseImports
PredefInitialization.apply(
interpApi,
storage,
basePredefs,
customPredefs,
// AutoImport is false, because we do not want the predef imports to get
// bundled into the main `eval.imports`: instead we pass `predefImports`
// manually throughout, and keep `eval.imports` as a relatively-clean
// listing which only contains the imports for code a user entered.
processModule(_, _, autoImport = false, "", _),
imports => predefImports = predefImports ++ imports,
watch
) match{
case Res.Success(_) => None
case Res.Skip => None
case r @ Res.Exception(t, s) => Some((r, watchedValues.toSeq))
case r @ Res.Failure(s) => Some((r, watchedValues.toSeq))
case r @ Res.Exit(_) => Some((r, watchedValues.toSeq))
}
}
// The ReplAPI requires some special post-Interpreter-initialization
// code to run, so let it pass it in a callback and we'll run it here
def watch(p: os.Path) = watchedValues.append(
(Watchable.Path(p), Watchable.pathSignature(p))
)
def watchValue[T](v: => T) = watchedValues.append((() => v.hashCode, v.hashCode()))
def resolveSingleImportHook(
source: CodeSource,
tree: ImportTree,
wrapperPath: Seq[Name]
) = synchronized{
val hookOpt = importHooks.find{case (k, v) => tree.strippedPrefix.startsWith(k)}
for{
(hookPrefix, hook) <- Res(hookOpt, s"Import Hook ${tree.prefix} could not be resolved")
hooked <- Res(
hook.handle(
source,
tree.copy(prefix = tree.prefix.drop(hookPrefix.length)),
this,
wrapperPath
)
)
hookResults <- Res.map(hooked){
case res: ImportHook.Result.Source =>
for{
processed <- processModule(
res.code, res.codeSource,
autoImport = false, extraCode = "", hardcoded = false
)
} yield {
// For $file imports, we do not propagate any imports from the imported scripted
// to the enclosing session. Instead, the imported script wrapper object is
// brought into scope and you're meant to use the methods defined on that.
//
// Only $exec imports merge the scope of the imported script into your enclosing
// scope, but those are comparatively rare.
if (!res.exec) res.hookImports
else processed.blockInfo.last.finalImports ++ res.hookImports
}
case res: ImportHook.Result.ClassPath =>
if (res.plugin) headFrame.addPluginClasspath(res.files.map(_.toNIO.toUri.toURL))
else headFrame.addClasspath(res.files.map(_.toNIO.toUri.toURL))
Res.Success(Imports())
case ImportHook.Result.Repo(repo) =>
addRepository(repo)
Res.Success(Imports())
}
} yield hookResults
}
def resolveImportHooks(importTrees: Seq[ImportTree],
hookedStmts: Seq[String],
source: CodeSource,
wrapperPath: Seq[Name]): Res[ImportHookInfo] = synchronized{
// Fake an update to the classpath to force re-creation of the compiler
// Workaround for https://github.com/scala/bug/issues/11564#issuecomment-501834821,
// which I caused in 2.13.0 and should be fixed in 2.13.1
if (scala.util.Properties.versionNumberString == "2.13.0") headFrame.addClasspath(Nil)
for (hookImports <- Res.map(importTrees)(resolveSingleImportHook(source, _, wrapperPath)))
yield ImportHookInfo(
Imports(hookImports.flatten.flatMap(_.value)),
hookedStmts,
importTrees
)
}
def processLine(code: String,
stmts: Seq[String],
currentLine: Int,
silent: Boolean = false,
incrementLine: () => Unit): Res[Evaluated] = synchronized{
val wrapperName = Name(wrapperNamePrefix + currentLine)
val codeSource = CodeSource(
wrapperName,
Seq(),
Seq(Name("ammonite"), Name("$sess")),
Some(wd/"(console)")
)
val (hookStmts, importTrees) = parser().parseImportHooks(codeSource, stmts)
for{
_ <- Catching { case ex => Res.Exception(ex, "") }
ImportHookInfo(hookImports, hookStmts, _) <- resolveImportHooks(
importTrees,
hookStmts,
codeSource,
replCodeWrapper.wrapperPath
)
processed <- compilerManager.preprocess("(console)").transform(
hookStmts,
currentLine.toString,
"",
codeSource,
wrapperName,
predefImports ++ frameImports ++ hookImports,
prints => s"ammonite.repl.ReplBridge.value.Internal.combinePrints($prints)",
extraCode = "",
skipEmpty = true,
markScript = false,
codeWrapper = replCodeWrapper
)
(out, tag) <- evaluateLine(
processed,
wrapperName.encoded + ".sc", wrapperName,
silent,
incrementLine
)
} yield out.copy(imports = out.imports ++ hookImports)
}
def evaluateLine(processed: Preprocessor.Output,
fileName: String,
indexedWrapperName: Name,
silent: Boolean = false,
incrementLine: () => Unit): Res[(Evaluated, Tag)] = synchronized{
for{
_ <- Catching{ case e: ThreadDeath => Evaluator.interrupted(e) }
output <- Res(
compilerManager.compileClass(
processed,
printer,
fileName
),
"Compilation Failed"
)
_ = incrementLine()
res <- eval.processLine(
output.classFiles,
output.imports,
output.usedEarlierDefinitions.getOrElse(Nil),
printer,
indexedWrapperName,
replCodeWrapper.wrapperPath,
silent,
evalClassloader
)
} yield (res, Tag("", "", classPathWhitelist.hashCode().toString))
}
def processSingleBlock(processed: Preprocessor.Output,
codeSource0: CodeSource,
indexedWrapperName: Name) = synchronized{
val codeSource = codeSource0.copy(wrapperName = indexedWrapperName)
val fullyQualifiedName = codeSource.jvmPathPrefix
val tag = Tag(
Interpreter.cacheTag(processed.code.getBytes),
Interpreter.cacheTag(evalClassloader.classpathHash(codeSource0.path)),
classPathWhitelist.hashCode().toString
)
for {
_ <- Catching{case e: Throwable => e.printStackTrace(); throw e}
output <- Res(
compilerManager.compileClass(
processed, printer, codeSource.printablePath
),
"Compilation Failed"
)
cls <- eval.loadClass(fullyQualifiedName, output.classFiles)
res <- eval.processScriptBlock(
cls,
output.imports,
output.usedEarlierDefinitions.getOrElse(Nil),
codeSource.wrapperName,
scriptCodeWrapper.wrapperPath,
codeSource.pkgName,
evalClassloader
)
} yield {
storage.compileCacheSave(
fullyQualifiedName,
tag,
Storage.CompileCache(output.classFiles, output.imports)
)
(res, tag)
}
}
def processModule(code: String,
codeSource: CodeSource,
autoImport: Boolean,
extraCode: String,
hardcoded: Boolean,
moduleCodeWrapper: CodeWrapper = scriptCodeWrapper)
: Res[ScriptOutput.Metadata] = synchronized{
alreadyLoadedFiles.get(codeSource) match{
case Some(x) => Res.Success(x)
case None =>
val tag = Tag(
Interpreter.cacheTag(code.getBytes),
Interpreter.cacheTag(
if (hardcoded) Array.empty[Byte]
else evalClassloader.classpathHash(codeSource.path)
),
classPathWhitelist.hashCode().toString
)
val cachedScriptData = storage.classFilesListLoad(
os.sub / codeSource.filePathPrefix,
tag
)
// Lazy, because we may not always need this if the script is already cached
// and none of it's blocks end up needing to be re-compiled. We don't know up
// front if any blocks will need re-compilation, because it may import $file
// another script which gets changed, and we'd only know when we reach that block
lazy val splittedScript = parser().splitScript(
Interpreter.skipSheBangLine(code),
codeSource.printablePath
)
for{
blocks <- cachedScriptData match {
case None => Res(splittedScript).map(_.map(_ => None))
case Some(scriptOutput) =>
Res.Success(
scriptOutput.classFiles
.zip(scriptOutput.processed.blockInfo)
.map(Some(_))
)
}
_ <- Catching { case ex => Res.Exception(ex, "") }
metadata <- processAllScriptBlocks(
blocks,
Res(splittedScript),
predefImports,
codeSource,
processSingleBlock(_, codeSource, _),
autoImport,
extraCode
)
} yield {
storage.classFilesListSave(
os.sub / codeSource.filePathPrefix,
metadata.blockInfo,
tag
)
alreadyLoadedFiles(codeSource) = metadata
metadata
}
}
}
def processExec(code: String,
currentLine: Int,
incrementLine: () => Unit): Res[Imports] = synchronized{
val wrapperName = Name(wrapperNamePrefix + currentLine)
val fileName = wrapperName.encoded + ".sc"
for {
blocks <- Res(parser().splitScript(Interpreter.skipSheBangLine(code), fileName))
metadata <- processAllScriptBlocks(
blocks.map(_ => None),
Res.Success(blocks),
predefImports ++ frameImports,
CodeSource(
wrapperName,
Seq(),
Seq(Name("ammonite"), Name("$sess")),
Some(wd/"(console)")
),
(processed, indexedWrapperName) =>
evaluateLine(processed, fileName, indexedWrapperName, false, incrementLine),
autoImport = true,
""
)
} yield {
metadata.blockInfo.last.finalImports
}
}
type BlockData = Option[(ClassFiles, ScriptOutput.BlockMetadata)]
def processAllScriptBlocks(blocks: Seq[BlockData],
splittedScript: => Res[IndexedSeq[(String, Seq[String])]],
startingImports: Imports,
codeSource: CodeSource,
evaluate: (Preprocessor.Output, Name) => Res[(Evaluated, Tag)],
autoImport: Boolean,
extraCode: String): Res[ScriptOutput.Metadata] = synchronized{
// we store the old value, because we will reassign this in the loop
val outerScriptImportCallback = scriptImportCallback
/**
* Iterate over the blocks of a script keeping track of imports.
*
* We keep track of *both* the `scriptImports` as well as the `lastImports`
* because we want to be able to make use of any import generated in the
* script within its blocks, but at the end we only want to expose the
* imports generated by the last block to who-ever loaded the script
*
* @param blocks the compilation block of the script, separated by `@`s.
* Each one is a tuple containing the leading whitespace and
* a sequence of statements in that block
*
* @param scriptImports the set of imports that apply to the current
* compilation block, excluding that of the last
* block that was processed since that is held
* separately in `lastImports` and treated
* specially
*
* @param lastImports the imports created by the last block that was processed;
* only imports created by that
*
* @param wrapperIndex a counter providing the index of the current block, so
* e.g. if `Foo.sc` has multiple blocks they can be named
* `Foo_1` `Foo_2` etc.
*
* @param perBlockMetadata an accumulator for the processed metadata of each block
* that is fed in
*/
@tailrec def loop(blocks: Seq[BlockData],
scriptImports: Imports,
lastImports: Imports,
wrapperIndex: Int,
perBlockMetadata: List[ScriptOutput.BlockMetadata])
: Res[ScriptOutput.Metadata] = {
if (blocks.isEmpty) {
// No more blocks
// if we have imports to pass to the upper layer we do that
if (autoImport) outerScriptImportCallback(lastImports)
Res.Success(ScriptOutput.Metadata(perBlockMetadata))
} else {
// imports from scripts loaded from this script block will end up in this buffer
var nestedScriptImports = Imports()
scriptImportCallback = { imports =>
nestedScriptImports = nestedScriptImports ++ imports
}
// pretty printing results is disabled for scripts
val indexedWrapperName = Interpreter.indexWrapperName(codeSource.wrapperName, wrapperIndex)
def compileRunBlock(leadingSpaces: String, hookInfo: ImportHookInfo) = {
val printSuffix = if (wrapperIndex == 1) "" else " #" + wrapperIndex
printer.info("Compiling " + codeSource.printablePath + printSuffix)
for{
processed <- compilerManager.preprocess(codeSource.fileName).transform(
hookInfo.stmts,
"",
leadingSpaces,
codeSource,
indexedWrapperName,
scriptImports ++ hookInfo.imports,
_ => "_root_.scala.Iterator[String]()",
extraCode = extraCode,
skipEmpty = false,
markScript = false,
codeWrapper = scriptCodeWrapper
)
(ev, tag) <- evaluate(processed, indexedWrapperName)
} yield ScriptOutput.BlockMetadata(
VersionedWrapperId(ev.wrapper.map(_.encoded).mkString("."), tag),
leadingSpaces,
hookInfo,
ev.imports
)
}
val cachedLoaded = for{
(classFiles, blockMetadata) <- blocks.head
// We don't care about the results of resolving the import hooks;
// Assuming they still *can* be resolved, the `envHash` check will
// ensure re-compile this block if the contents of any import hook
// changes
if resolveImportHooks(
blockMetadata.hookInfo.trees,
blockMetadata.hookInfo.stmts,
codeSource,
scriptCodeWrapper.wrapperPath
).isInstanceOf[Res.Success[_]]
} yield {
val envHash = Interpreter.cacheTag(evalClassloader.classpathHash(codeSource.path))
if (envHash != blockMetadata.id.tag.env) {
compileRunBlock(blockMetadata.leadingSpaces, blockMetadata.hookInfo)
} else{
compilerManager.addToClasspath(classFiles)
val cls = eval.loadClass(blockMetadata.id.wrapperPath, classFiles)
val evaluated =
try cls.map(eval.evalMain(_, evalClassloader))
catch Evaluator.userCodeExceptionHandler
evaluated.map(_ => blockMetadata)
}
}
val res = cachedLoaded.getOrElse{
for{
allSplittedChunks <- splittedScript
(leadingSpaces, stmts) = allSplittedChunks(wrapperIndex - 1)
(hookStmts, importTrees) = parser().parseImportHooks(codeSource, stmts)
hookInfo <- resolveImportHooks(
importTrees, hookStmts, codeSource, scriptCodeWrapper.wrapperPath
)
res <- compileRunBlock(leadingSpaces, hookInfo)
} yield res
}
res match{
case Res.Success(blockMetadata) =>
val last =
blockMetadata.hookInfo.imports ++
blockMetadata.finalImports ++
nestedScriptImports
loop(
blocks.tail,
scriptImports ++ last,
last,
wrapperIndex + 1,
blockMetadata :: perBlockMetadata
)
case r: Res.Exit => r
case r: Res.Failure => r
case r: Res.Exception => r
case Res.Skip =>
loop(blocks.tail, scriptImports, lastImports, wrapperIndex + 1, perBlockMetadata)
}
}
}
// wrapperIndex starts off as 1, so that consecutive wrappers can be named
// Wrapper, Wrapper2, Wrapper3, Wrapper4, ...
try {
for(res <- loop(blocks, startingImports, Imports(), wrapperIndex = 1, List()))
// We build up `blockInfo` backwards, since it's a `List`, so reverse it
// before giving it to the outside world
yield ScriptOutput.Metadata(res.blockInfo.reverse)
} finally scriptImportCallback = outerScriptImportCallback
}
def loadIvy(coordinates: Dependency*) = synchronized {
dependencyLoader.load(
coordinates,
repositories(),
resolutionHooks.toSeq
)
}
private def addRepository(repository: Repository): Unit = synchronized {
val current = repositories()
repositories.update(current :+ repository)
}
abstract class DefaultLoadJar extends LoadJar {
def handleClasspath(jar: java.net.URL): Unit
def cp(jar: os.Path): Unit = {
handleClasspath(jar.toNIO.toUri.toURL)
}
def cp(jars: Seq[os.Path]): Unit = {
jars.map(_.toNIO.toUri.toURL).foreach(handleClasspath)
}
def cp(jar: java.net.URL): Unit = {
handleClasspath(jar)
}
def ivy(coordinates: Dependency*): Unit = {
loadIvy(coordinates:_*) match{
case Left(failureMsg) =>
throw new Exception(failureMsg)
case Right(loaded) =>
loaded
.map(_.toURI.toURL)
.foreach(handleClasspath)
}
}
}
lazy val interpApi: InterpAPI = new InterpAPI{ outer =>
val colors = parameters.colors
def watch(p: os.Path) = interp.watch(p)
def watchValue[T](v: => T): T = {interp.watchValue(v); v}
val beforeExitHooks = interp.beforeExitHooks
val repositories = interp.repositories
val resolutionHooks = interp.resolutionHooks
object load extends DefaultLoadJar with InterpLoad {
def handleClasspath(jar: java.net.URL) = headFrame.addClasspath(Seq(jar))
def module(file: os.Path) = {
watch(file)
val (pkg, wrapper) = ammonite.util.Util.pathToPackageWrapper(
Seq(Name("dummy")),
file relativeTo wd
)
processModule(
normalizeNewlines(os.read(file)),
CodeSource(
wrapper,
pkg,
Seq(Name("ammonite"), Name("$file")),
Some(wd/"Main.sc")
),
autoImport = true,
extraCode = "",
hardcoded = false
) match{
case Res.Failure(s) => throw new CompilationError(s)
case Res.Exception(t, s) => throw t
case x => //println(x)
}
}
object plugin extends DefaultLoadJar {
def handleClasspath(jar: java.net.URL) = headFrame.addPluginClasspath(Seq(jar))
}
}
def scalaVersion = ScalaVersion(interp.scalaVersion)
def _compilerManager = interp.compilerManager
}
}
object Interpreter{
/** @param wrapperNamePrefix
* Name to be used as a prefix for source file and classes wrapping user code, that ends in
* compilation errors or stack traces in particular
*/
case class Parameters(
printer: Printer = Printer(
System.out,
System.err,
System.out,
System.err.println,
System.err.println,
System.err.println
),
storage: Storage = Storage.InMemory(),
wd: os.Path = os.pwd,
colors: Ref[Colors] = Ref(Colors.Default),
verboseOutput: Boolean = true,
initialClassLoader: ClassLoader = null,
importHooks: Map[Seq[String], ImportHook] = ImportHook.defaults,
alreadyLoadedDependencies: Seq[Dependency] = Nil,
classPathWhitelist: Set[Seq[String]] = Set.empty,
wrapperNamePrefix: String = "cmd"
)
val predefImports = Imports(
ImportData("ammonite.interp.api.InterpBridge.value.exit"),
ImportData("ammonite.interp.api.InterpBridge.value.scalaVersion"),
ImportData(
"ammonite.interp.api.IvyConstructor.{ArtifactIdExt, GroupIdExt}",
importType = ImportData.Type
),
ImportData("""ammonite.compiler.CompilerExtensions.{
CompilerInterpAPIExtensions,
CompilerReplAPIExtensions
}"""),
ImportData("ammonite.runtime.tools.{browse, grep, time}"),
ImportData("ammonite.runtime.tools.tail", importType = ImportData.TermType),
ImportData("ammonite.compiler.tools.{desugar, source}"),
ImportData("mainargs.{arg, main}"),
ImportData("ammonite.repl.tools.Util.PathRead"),
ImportData("ammonite.repl.ReplBridge.value.codeColorsImplicit")
)
val SheBang = "#!"
val SheBangEndPattern = Pattern.compile(s"""((?m)^!#.*)$newLine""")
/**
* This gives our cache tags for compile caching. The cache tags are a hash
* of classpath, previous commands (in-same-script), and the block-code.
* Previous commands are hashed in the wrapper names, which are contained
* in imports, so we don't need to pass them explicitly.
*/
def cacheTag(classpathHash: Array[Byte]): String = {
val bytes = ammonite.util.Util.md5Hash(Iterator(
classpathHash
))
bytes.map("%02x".format(_)).mkString
}
def skipSheBangLine(code: String) = {
val newLineLength = newLine.length
/**
* the skipMultipleLines function is necessary to support the parsing of
* multiple shebang lines. The NixOs nix-shell normally uses 2+ shebang lines.
*/
def skipMultipleLines(ind: Int = 0): Int = {
val index = code.indexOf('\n', ind)
if (code.substring(index + 1).startsWith(SheBang))
skipMultipleLines(ind + index + 1)
else index - (newLineLength - 1)
}
if (code.startsWith(SheBang)) {
val matcher = SheBangEndPattern matcher code
val shebangEnd = if (matcher.find) matcher.end else skipMultipleLines()
val numberOfStrippedLines = newLine.r.findAllMatchIn( code.substring(0, shebangEnd) ).length
(newLine * numberOfStrippedLines) + code.substring(shebangEnd)
} else
code
}
def indexWrapperName(wrapperName: Name, wrapperIndex: Int): Name = {
Name(wrapperName.raw + (if (wrapperIndex == 1) "" else "_" + wrapperIndex))
}
def initPrinters(colors0: Colors,
output: OutputStream,
error: OutputStream,
verboseOutput: Boolean) = {
val colors = Ref[Colors](colors0)
val printStream = new PrintStream(output, true)
val errorPrintStream = new PrintStream(error, true)
def printlnWithColor(stream: PrintStream, color: fansi.Attrs, s: String) = {
stream.println(color(s).render)
}
val printer = Printer(
printStream,
errorPrintStream,
printStream,
printlnWithColor(errorPrintStream, colors().warning(), _),
printlnWithColor(errorPrintStream, colors().error(), _),
s => if (verboseOutput) printlnWithColor(errorPrintStream, colors().info(), s)
)
(colors, printer)
}
}
