build scripts: simplification

Do not require leading dot in WindowsDistributionCustomizer::fileAssociations property to simplify code and for consistency with MacDistributionCustomizer::fileAssociations.

build/groovy/org/jetbrains/intellij/build/IdeaCommunityProperties.groovy

@@ -68,7 +68,7 @@ class IdeaCommunityProperties extends BaseIdeaProperties {
       {
         icoPath = "$projectHome/platform/icons/src/idea_CE.ico"
         installerImagesPath = "$projectHome/build/conf/ideaCE/win/images"
-        fileAssociations = [".java", ".groovy", ".kt"]
+        fileAssociations = ["java", "groovy", "kt"]
       }
 
       @Override

platform/build-scripts/groovy/org/jetbrains/intellij/build/MacDistributionCustomizer.groovy

@@ -70,7 +70,7 @@ abstract class MacDistributionCustomizer {
   String additionalDocTypes = ""
 
   /**
-   * List of file extensions (without dot) which installer will associate with the product. Note that users won't be able to switch off some
+   * List of file extensions (without leading dot) which installer will associate with the product. Note that users won't be able to switch off some
    * of these associations during installation so include only types of files which users will definitely prefer to open by the product.
    */
   List<String> fileAssociations = []

platform/build-scripts/groovy/org/jetbrains/intellij/build/WindowsDistributionCustomizer.groovy

@@ -68,7 +68,7 @@ abstract class WindowsDistributionCustomizer {
   String installerImagesPath
 
   /**
-   * List of file extensions (starting with dot) which installer will suggest to associate with the product
+   * List of file extensions (without leading dot) which installer will suggest to associate with the product
    */
   List<String> fileAssociations = []
 

platform/build-scripts/groovy/org/jetbrains/intellij/build/impl/WinExeInstallerBuilder.groovy

@@ -54,7 +54,7 @@ class WinExeInstallerBuilder {
 
       buildContext.ant.copy(file: "$silentConfigTemplate", tofile: targetFilePath)
       File silentConfigFile = new File(targetFilePath)
-      def extensionsList = customizer.fileAssociations
+      def extensionsList = getFileAssociations()
       String associations = "\n\n; List of associations. To create an association change value to 1.\n"
       if (!extensionsList.isEmpty()) {
         associations += extensionsList.collect { "$it=0\n" }.join("")
@@ -66,6 +66,13 @@ class WinExeInstallerBuilder {
     }
   }
 
+  /**
+   * Returns list of file extensions with leading dot added
+   */
+  private List<String> getFileAssociations() {
+    customizer.fileAssociations.collect { !it.startsWith(".") ? ".$it" : it}
+  }
+
   void buildInstaller(String winDistPath) {
     if (!SystemInfoRt.isWindows && !SystemInfoRt.isLinux) {
       buildContext.messages.warning("Windows installer can be built only under Windows or Linux")
@@ -179,7 +186,7 @@ class WinExeInstallerBuilder {
 !define PRODUCT_VM_OPTIONS_FILE "${toSystemDependentName("$winDistPath/bin/")}\${PRODUCT_VM_OPTIONS_NAME}"
 """
 
-    def extensionsList = customizer.fileAssociations
+    def extensionsList = getFileAssociations()
     def fileAssociations = extensionsList.isEmpty() ? "NoAssociation" : extensionsList.join(",")
     def linkToJre = customizer.getBaseDownloadUrlForJre() != null ?
                       "${customizer.getBaseDownloadUrlForJre()}/${buildContext.bundledJreManager.archiveNameJre(buildContext)}" :

python/build/groovy/org/jetbrains/intellij/build/pycharm/PyCharmCommunityProperties.groovy

@@ -60,7 +60,7 @@ class PyCharmCommunityProperties extends PyCharmPropertiesBase {
     return new PyCharmWindowsDistributionCustomizer() {
       {
         installerImagesPath = "$projectHome/python/build/resources"
-        fileAssociations = [".py"]
+        fileAssociations = ["py"]
       }
 
       @Override

python/educational-python/build/groovy/org/jetbrains/intellij/build/pycharm/edu/PyCharmEduProperties.groovy

@@ -55,7 +55,7 @@ class PyCharmEduProperties extends PyCharmPropertiesBase {
     return new PyCharmWindowsDistributionCustomizer() {
       {
         installerImagesPath = "$pythonCommunityPath/educational-python/build/resources"
-        fileAssociations = [".py"]
+        fileAssociations = ["py"]
         silentInstallationConfig = "$pythonCommunityPath/educational-python/build/silent.config"
         customNsiConfigurationFiles = [
           "$pythonCommunityPath/educational-python/build/desktop.ini",