Restore the ability to add maya interpreter to PyCharm (PY-21723)

(cherry picked from commit 530cb08c)
(cherry picked from commit 63f51bca)

python/src/META-INF/python-core-common.xml

@@ -709,6 +709,8 @@
 
     <!-- PyQt -->
     <typeProvider implementation="com.jetbrains.pyqt.PyQtTypeProvider"/>
+
+    <pythonFlavorProvider implementation="com.jetbrains.python.sdk.flavors.MayaFlavorProvider"/>
   </extensions>
 
   <actions>

python/src/com/jetbrains/python/sdk/flavors/MayaSdkFlavor.kt

+/*
+ * Copyright 2000-2016 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.jetbrains.python.sdk.flavors
+
+import com.intellij.openapi.util.io.FileUtil
+import com.intellij.openapi.vfs.VirtualFile
+import icons.PythonIcons
+import java.io.File
+import javax.swing.Icon
+
+/**
+ * @author traff
+ */
+class MayaSdkFlavor private constructor() : PythonSdkFlavor() {
+
+  override fun isValidSdkHome(path: String): Boolean {
+    val file = File(path)
+    return file.isFile && isValidSdkPath(file) || isMayaFolder(file)
+  }
+
+  override fun isValidSdkPath(file: File): Boolean {
+    val name = FileUtil.getNameWithoutExtension(file).toLowerCase()
+    return name.startsWith("mayapy")
+  }
+
+  override fun getVersionOption(): String {
+    return "--version"
+  }
+
+  override fun getName(): String {
+    return "MayaPy"
+  }
+
+  override fun getIcon(): Icon {
+    return PythonIcons.Python.Python //TODO: maya icon
+  }
+
+  override fun getSdkPath(path: VirtualFile): VirtualFile? {
+    if (isMayaFolder(File(path.path))) {
+      return path.findFileByRelativePath("Contents/bin/mayapy")
+    }
+    return path
+  }
+
+  companion object {
+
+    var INSTANCE = MayaSdkFlavor()
+
+    private fun isMayaFolder(file: File): Boolean {
+      return file.isDirectory && file.name == "Maya.app"
+    }
+  }
+}
+
+
+class MayaFlavorProvider: PythonFlavorProvider {
+  override fun getFlavor(platformIndependent: Boolean) = MayaSdkFlavor.INSTANCE
+}