WI-38883: Spellchecker: register dictionary filetype

spellchecker/src/META-INF/SpellCheckerPlugin.xml

@@ -20,7 +20,7 @@
     <applicationService serviceInterface="com.intellij.openapi.editor.SpellCheckingEditorCustomizationProvider"
                         serviceImplementation="com.intellij.spellchecker.ui.SpellCheckingEditorCustomizationProviderImpl"
                         overrides="true"/>
-
+    <fileTypeFactory implementation="com.intellij.spellchecker.DictionaryFileTypeFactory"/>
     <projectService serviceInterface="com.intellij.spellchecker.settings.SpellCheckerSettings"
                     serviceImplementation="com.intellij.spellchecker.settings.SpellCheckerSettings"/>
     <projectService serviceInterface="com.intellij.spellchecker.SpellCheckerManager"

spellchecker/src/com/intellij/spellchecker/DictionaryFileType.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+ */
+package com.intellij.spellchecker;
+
+import com.intellij.openapi.fileTypes.FileType;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.spellchecker.util.SpellCheckerBundle;
+import icons.SpellcheckerIcons;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+
+public class DictionaryFileType implements FileType {
+  public static final DictionaryFileType INSTANCE = new DictionaryFileType();
+
+  @NotNull
+  @Override
+  public String getName() {
+    return SpellCheckerBundle.message("dictionary.filetype.name");
+  }
+
+  @NotNull
+  @Override
+  public String getDescription() {
+    return SpellCheckerBundle.message("dictionary.filetype.description");
+  }
+
+  @NotNull
+  @Override
+  public String getDefaultExtension() {
+    return "dic";
+  }
+
+  @Nullable
+  @Override
+  public Icon getIcon() {
+    // TODO: request an icon DSGN-4790
+    return SpellcheckerIcons.Spellcheck;
+  }
+
+  @Override
+  public boolean isBinary() {
+    return false;
+  }
+
+  @Override
+  public boolean isReadOnly() {
+    return false;
+  }
+
+  @Nullable
+  @Override
+  public String getCharset(@NotNull VirtualFile file, @NotNull byte[] content) {
+    return null;
+  }
+}

spellchecker/src/com/intellij/spellchecker/DictionaryFileTypeFactory.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+ */
+package com.intellij.spellchecker;
+
+import com.intellij.openapi.fileTypes.FileTypeConsumer;
+import com.intellij.openapi.fileTypes.FileTypeFactory;
+import org.jetbrains.annotations.NotNull;
+
+public class DictionaryFileTypeFactory extends FileTypeFactory {
+
+  @Override
+  public void createFileTypes(@NotNull FileTypeConsumer consumer) {
+    consumer.consume(DictionaryFileType.INSTANCE, DictionaryFileType.INSTANCE.getDefaultExtension());
+  }
+}

spellchecker/src/com/intellij/spellchecker/util/SpellCheckerBundle.properties

@@ -34,3 +34,5 @@ dictionaries.panel.description=Enable/disable dictionaries for your project
 no.words=No additional words
 no.custom.folders=No custom folders
 no.dictionaries=No dictionaries found
+dictionary.filetype.name=Dictionary
+dictionary.filetype.description=Dictionary file