fix for #2885 - output correct JAVA env setters in Windows bash sessions

.github/scripts/generate-os-packages.sh

@@ -6,7 +6,7 @@ ARCHITECTURE=$(uname -m)
 ARTIFACTS_DIR="artifacts/"
 mkdir -p "$ARTIFACTS_DIR"
 
-if [[ "$OSTYPE" == "msys" ]]; then
+if [[ -z "$OSTYPE" ]]; then
   mill="./mill.bat"
 else
   mill="./mill"
@@ -17,7 +17,7 @@ launcher() {
   local launcherMillCommand="cliNativeImageLauncher"
   local launcherName
 
-  if [[ "$OSTYPE" == "msys" ]]; then
+  if [[ "${OS-}" == "Windows_NT" ]]; then
     launcherName="cs.exe"
   else
     launcherName="cs"

modules/cli/src/main/scala/coursier/cli/jvm/Java.scala

@@ -144,6 +144,8 @@ object Java extends CoursierCommand[JavaOptions] {
         val script =
           if (params.env.windowsScript)
             coursier.jvm.JavaHome.finalBatScript(envUpdate)
+          else if (params.env.windowsPosixScript)
+            coursier.jvm.JavaHome.finalBashScript(envUpdate).replace('\\', '/')
           else
             ShellUtil.shell() match {
               case Some(Shell.Fish) => coursier.jvm.JavaHome.finalFishScript(envUpdate)

modules/cli/src/main/scala/coursier/cli/jvm/JavaHome.scala

@@ -48,6 +48,8 @@ object JavaHome extends CoursierCommand[JavaHomeOptions] {
       val script =
         if (params.env.windowsScript)
           coursier.jvm.JavaHome.finalBatScript(envUpdate)
+        else if (params.env.windowsPosixScript)
+          coursier.jvm.JavaHome.finalBashScript(envUpdate).replace('\\', '/')
         else
           coursier.jvm.JavaHome.finalBashScript(envUpdate)
       print(script)

modules/cli/src/main/scala/coursier/cli/options/EnvOptions.scala

@@ -18,7 +18,11 @@ final case class EnvOptions(
 
   @Group(OptionGroup.scripting)
   @Hidden
-    windowsScript: Boolean = Properties.isWin,
+    windowsScript: Option[Boolean] = None,
+
+  @Group(OptionGroup.scripting)
+  @Hidden
+    windowsPosixScript: Option[Boolean] = None,
 
   @Group(OptionGroup.scripting)
   @HelpMessage("Sets the default JVM to be used")

modules/cli/src/main/scala/coursier/cli/params/EnvParams.scala

@@ -3,6 +3,7 @@ package coursier.cli.params
 import java.nio.file.{Path, Paths}
 
 import cats.data.{Validated, ValidatedNel}
+import cats.implicits._
 import coursier.cli.options.EnvOptions
 import coursier.env.{EnvironmentUpdate, ProfileUpdater, WindowsEnvVarUpdater}
 import coursier.launcher.internal.Windows
@@ -15,7 +16,8 @@ final case class EnvParams(
   disableEnv: Boolean,
   setup: Boolean,
   homeOpt: Option[Path],
-  windowsScript: Boolean
+  windowsScript: Boolean,
+  windowsPosixScript: Boolean
 ) {
   def anyFlag: Boolean = env || setup
   // TODO Allow to customize some parameters of WindowsEnvVarUpdater / ProfileUpdater?
@@ -87,6 +89,10 @@ final case class EnvParams(
 }
 
 object EnvParams {
+
+  def defaultWindowsPosixScript: Boolean =
+    Properties.isWin && Option(System.getenv("OSTYPE")).exists(_.trim.nonEmpty)
+
   def apply(options: EnvOptions): ValidatedNel[String, EnvParams] = {
     val homeOpt = options.userHome.filter(_.nonEmpty).map(Paths.get(_))
 
@@ -103,14 +109,49 @@ object EnvParams {
       else
         Validated.validNel(())
 
-    flagsV.map { _ =>
-      EnvParams(
-        options.env,
-        options.disableEnv,
-        options.setup,
-        homeOpt,
-        options.windowsScript
-      )
+    val windowsScriptValues0 = (options.windowsScript, options.windowsPosixScript) match {
+      case (Some(true), Some(true)) =>
+        Validated.invalidNel("Cannot specify both --windows-script and --windows-posix-script")
+      case (Some(true), _) =>
+        Validated.validNel(Some(true))
+      case (_, Some(true)) =>
+        Validated.validNel(Some(false))
+      case (Some(false), Some(false)) =>
+        Validated.validNel(None)
+      case (None, Some(false)) =>
+        Validated.validNel {
+          if (Properties.isWin) Some(true)
+          else None
+        }
+      case (Some(false), None) =>
+        Validated.validNel {
+          if (defaultWindowsPosixScript) Some(false)
+          else None
+        }
+      case (None, None) =>
+        Validated.validNel {
+          if (defaultWindowsPosixScript) Some(false)
+          else if (Properties.isWin) Some(true)
+          else None
+        }
+    }
+
+    val windowsScriptValues = windowsScriptValues0.map {
+      case Some(true)  => (true, false)
+      case Some(false) => (false, true)
+      case None        => (false, false)
+    }
+
+    (flagsV, windowsScriptValues).mapN {
+      case (_, (windowsScript, windowsPosixScript)) =>
+        EnvParams(
+          options.env,
+          options.disableEnv,
+          options.setup,
+          homeOpt,
+          windowsScript,
+          windowsPosixScript
+        )
     }
   }
 }