Implement FilePathScheme

nio/build.gradle.kts

@@ -11,6 +11,8 @@ dependencies {
   api(project(":core", "default"))
   api(project(":file", "default"))
 
+  compileOnly("com.github.mpilquist:simulacrum_2.12:0.14.0")
+
   testImplementation("junit:junit:4.12")
   testImplementation("org.scalatest:scalatest_2.12:3.0.5")
   testCompileOnly("com.chuusai:shapeless_2.12:2.3.3")

nio/src/main/scala/eyrie/nio/context/Sys.scala

@@ -1,8 +1,10 @@
 package eyrie.nio.context
 
-import java.nio.file.{FileSystem, FileSystems}
+import java.nio.file._
 
-import eyrie.nio.ops.JavaMirror
+import eyrie.nio.FilePath
+import eyrie.nio.FilePath.Internal
+import eyrie.nio.ops.{FilePathScheme, JavaMirror}
 
 sealed trait Sys
 
@@ -23,4 +25,37 @@ object Sys {
       def asJava: FileSystem =
         FileSystems.getDefault
     }
+
+  private
+  def relative(path: Path): FilePath[Sys] =
+    if (path.getNameCount < 2 && Option(path.getFileName).forall(_.toString.isEmpty)) {
+      Internal.IdentityFilePath(path)
+    } else {
+      Internal.RelativeFile(path)
+    }
+
+  private
+  def absolute(path: Path): FilePath[Sys] =
+    if (path.getNameCount < 1) {
+      Internal.RootDirectory(path)
+    } else {
+      Internal.AbsoluteFile(path)
+    }
+
+  implicit val eyrieNioFilePathScheme: FilePathScheme[Sys] =
+    string =>
+      try {
+        Some {
+          val parsed = Paths.get(string)
+
+          if (parsed.isAbsolute) {
+            absolute(parsed)
+          } else {
+            relative(parsed)
+          }
+        }
+      } catch {
+        case _: InvalidPathException =>
+          None
+      }
 }

nio/src/main/scala/eyrie/nio/ops/FilePathScheme.scala

@@ -0,0 +1,9 @@
+package eyrie.nio.ops
+
+import eyrie.nio.FilePath
+import simulacrum.typeclass
+
+@typeclass
+trait FilePathScheme[A] {
+  def getPath(string: String): Option[FilePath[A]]
+}

nio/src/main/scala/eyrie/nio/syntax/FilePathSchemeSyntax.scala

@@ -0,0 +1,14 @@
+package eyrie.nio.syntax
+
+import eyrie.nio.FilePath
+import eyrie.nio.ops.FilePathScheme
+
+trait FilePathSchemeSyntax {
+  implicit def toFilePathSchemeOps(s: String): FilePathSchemeOps =
+    new FilePathSchemeOps(s)
+}
+
+final class FilePathSchemeOps(private val s: String) extends AnyVal {
+  def toFilePath[A](implicit A: FilePathScheme[A]): Option[FilePath[A]] =
+    A.getPath(s)
+}

nio/src/main/scala/eyrie/nio/syntax/package.scala

@@ -2,5 +2,6 @@ package eyrie.nio
 
 package object syntax {
   object all extends AllSyntax
+  object filePathScheme extends FilePathSchemeSyntax
   object javaMirror extends JavaMirrorSyntax
 }

nio/src/test/scala/eyrie/nio/test/FilePathSchemeSpec.scala

@@ -0,0 +1,17 @@
+package eyrie.nio.test
+
+import eyrie.nio.context.Sys
+import org.junit.runner.RunWith
+import org.scalatest.FreeSpec
+import org.scalatest.junit.JUnitRunner
+
+@RunWith(classOf[JUnitRunner])
+class FilePathSchemeSpec extends FreeSpec {
+  import eyrie.nio.syntax.filePathScheme._
+
+  "String" - {
+    "toFilePath should work" in {
+      "a/b/c".toFilePath[Sys]
+    }
+  }
+}