drive-relative paths in Windows SHELL environments

.gitignore

@@ -8,3 +8,6 @@ out/
 .scala-build
 dest/
 target/
+
+# ignore vim backup files
+*.sw[op]

modules/cli/src/main/scala/scala/cli/commands/installcompletions/InstallCompletions.scala

@@ -114,7 +114,7 @@ object InstallCompletions extends ScalaCommand[InstallCompletionsOptions] {
   def getFormat(format: Option[String]): Option[String] =
     format.map(_.trim).filter(_.nonEmpty)
       .orElse {
-        Option(System.getenv("SHELL")).map(_.split(File.separator).last).map {
+        Option(System.getenv("SHELL")).map(_.split("[\\/]+").last).map {
           case "bash" => Bash.id
           case "zsh"  => Zsh.id
           case other  => other

modules/integration/src/test/scala/scala/cli/integration/CompileTestDefinitions.scala

@@ -585,7 +585,7 @@ abstract class CompileTestDefinitions(val scalaVersionOpt: Option[String])
           "."
         ).call(cwd = root)
       val classPath          = res.out.trim().split(File.pathSeparator)
-      val classPathFileNames = classPath.map(_.split(Pattern.quote(File.separator)).last)
+      val classPathFileNames = classPath.map(_.split("[\\\\/]+").last)
       expect(classPathFileNames.exists(_.startsWith("spark-core_")))
       // usually a duplicate is there if we don't call .distrinct when necessary here or there
       expect(classPathFileNames.exists(_.startsWith("snappy-java")))

modules/integration/src/test/scala/scala/cli/integration/ConfigTests.scala

@@ -561,4 +561,20 @@ class ConfigTests extends ScalaCliSuite {
     }
   }
 
+  test("verify os.Path attributes") {
+    // requires os-lib 0.9.2 or later to succeed in Windows
+    val dr      = os.Path.driveRoot
+    val testStr = "/omg"
+    val p       = os.Path(testStr) // <<< must not throw Exception
+    val absPath = p.toString.replace('\\', '/')
+    val relPath = if (dr.nonEmpty) absPath.drop(2) else absPath
+    val synPath = s"${os.Path.driveRoot}$relPath"
+    printf("absPath[%s]\n", absPath)
+    printf("synPath[%s]\n", synPath)
+    printf("relPath[%s]\n", relPath)
+    expect(absPath == synPath)
+    expect(relPath == testStr)
+    expect(absPath endsWith testStr)
+  }
+
 }

modules/integration/src/test/scala/scala/cli/integration/PackageTestDefinitions.scala

@@ -731,7 +731,7 @@ abstract class PackageTestDefinitions(val scalaVersionOpt: Option[String])
         if (actualScalaVersion.startsWith("2.")) actualScalaVersion
         else {
           val scalaLibJarName = scalaLibCp.split(File.pathSeparator)
-            .map(_.split(Pattern.quote(File.separator)).last).find(_.startsWith("scala-library-"))
+            .map(_.split("[\\\\/]+").last).find(_.startsWith("scala-library-"))
             .getOrElse {
               sys.error(s"scala-library not found in provided class path $scalaLibCp")
             }

project/deps.sc

@@ -140,7 +140,7 @@ object Deps {
   def munit                      = ivy"org.scalameta::munit:0.7.29"
   def nativeTestRunner           = ivy"org.scala-native::test-runner:${Versions.scalaNative}"
   def nativeTools                = ivy"org.scala-native::tools:${Versions.scalaNative}"
-  def osLib                      = ivy"com.lihaoyi::os-lib:0.9.1"
+  def osLib                      = ivy"com.lihaoyi::os-lib:0.9.2"
   def pprint                     = ivy"com.lihaoyi::pprint:0.8.1"
   def pythonInterface            = ivy"io.github.alexarchambault.python:interface:0.1.0"
   def pythonNativeLibs           = ivy"ai.kien::python-native-libs:0.2.4"