Align compiler options to VWXY scheme

community-build/src/scala/dotty/communitybuild/projects.scala

@@ -357,8 +357,8 @@ object projects:
   lazy val stdLib213 = SbtCommunityProject(
     project       = "stdLib213",
     extraSbtArgs  = List("-Dscala.build.compileWithDotty=true"),
-    sbtTestCommand   = """library/compile""",
-    sbtPublishCommand = """set library/Compile/packageDoc/publishArtifact := false; library/publishLocal""",
+    sbtTestCommand   = """set Global / fatalWarnings := false; library/compile""",
+    sbtPublishCommand = """set Global / fatalWarnings := false; set library/Compile/packageDoc/publishArtifact := false; library/publishLocal""",
     // sbtDocCommand = "library/doc" // Does no compile? No idea :/
   )
 

compiler/src/dotty/tools/dotc/config/CliCommand.scala

@@ -7,7 +7,8 @@ import Settings._
 import core.Contexts._
 import Properties._
 
-import scala.collection.JavaConverters._
+ import scala.PartialFunction.cond
+ import scala.collection.JavaConverters._
 
 trait CliCommand:
 
@@ -107,7 +108,7 @@ trait CliCommand:
           // For now, skip the default values that do not make sense for the end user.
           // For example 'false' for the version command.
           ""
-      s"${formatName(s.name)} ${formatDescription(s.description)}${formatSetting("Default", defaultValue)}${formatSetting("Choices", s.legalChoices)}"
+      s"${formatName(s.name)} ${formatDescription(shortHelp(s))}${formatSetting("Default", defaultValue)}${formatSetting("Choices", s.legalChoices)}"
     ss.map(helpStr).mkString("", "\n", s"\n${formatName("@<file>")} ${formatDescription("A text file containing compiler arguments (options and source files).")}\n")
   end availableOptionsMsg
 
@@ -123,15 +124,30 @@ trait CliCommand:
     prefix + "\n" + availableOptionsMsg(cond)
 
   protected def isStandard(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
-    !isAdvanced(s) && !isPrivate(s)
+    !isVerbose(s) && !isWarning(s) && !isAdvanced(s) && !isPrivate(s) || s.name == "-Werror" || s.name == "-Wconf"
+  protected def isVerbose(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
+    s.name.startsWith("-V") && s.name != "-V"
+  protected def isWarning(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
+    s.name.startsWith("-W") && s.name != "-W" || s.name == "-Xlint"
   protected def isAdvanced(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
     s.name.startsWith("-X") && s.name != "-X"
   protected def isPrivate(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
     s.name.startsWith("-Y") && s.name != "-Y"
+  protected def shortHelp(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): String =
+    s.description.linesIterator.next()
+  protected def isHelping(s: Setting[?])(using settings: ConcreteSettings)(using SettingsState): Boolean =
+    cond(s.value) {
+      case ss: List[?] if s.isMultivalue => ss.contains("help")
+      case s: String                     => "help" == s
+    }
 
   /** Messages explaining usage and options */
   protected def usageMessage(using settings: ConcreteSettings)(using SettingsState) =
     createUsageMsg("where possible standard", shouldExplain = false, isStandard)
+  protected def vusageMessage(using settings: ConcreteSettings)(using SettingsState) =
+    createUsageMsg("Possible verbose", shouldExplain = true, isVerbose)
+  protected def wusageMessage(using settings: ConcreteSettings)(using SettingsState) =
+    createUsageMsg("Possible warning", shouldExplain = true, isWarning)
   protected def xusageMessage(using settings: ConcreteSettings)(using SettingsState) =
     createUsageMsg("Possible advanced", shouldExplain = true, isAdvanced)
   protected def yusageMessage(using settings: ConcreteSettings)(using SettingsState) =

compiler/src/dotty/tools/dotc/config/CompilerCommand.scala

@@ -14,11 +14,15 @@ abstract class CompilerCommand extends CliCommand:
 
   final def helpMsg(using settings: ScalaSettings)(using SettingsState, Context): String =
     if (settings.help.value) usageMessage
+    else if (settings.Vhelp.value) vusageMessage
+    else if (settings.Whelp.value) wusageMessage
     else if (settings.Xhelp.value) xusageMessage
     else if (settings.Yhelp.value) yusageMessage
     else if (settings.showPlugins.value) ctx.base.pluginDescriptions
     else if (settings.XshowPhases.value) phasesMessage
     else ""
 
   final def isHelpFlag(using settings: ScalaSettings)(using SettingsState): Boolean =
-    Set(settings.help, settings.Xhelp, settings.Yhelp, settings.showPlugins, settings.XshowPhases) exists (_.value)
+    import settings._
+    val flags = Set(help, Vhelp,  Whelp, Xhelp, Yhelp, showPlugins, XshowPhases)
+    flags.exists(_.value) || allSettings.exists(isHelping)