Add GraphQL configuration page for indentation (#29)

(cherry picked from commit 6289c01)

resources/META-INF/plugin.xml

@@ -112,6 +112,8 @@
     <lang.quoteHandler language="GraphQL" implementationClass="com.intellij.lang.jsgraphql.ide.editor.JSGraphQLQuoteHandler" />
     <lang.quoteHandler language="GraphQL Schema" implementationClass="com.intellij.lang.jsgraphql.ide.editor.JSGraphQLQuoteHandler" />
     <enterHandlerDelegate implementation="com.intellij.lang.jsgraphql.ide.formatter.JSGraphQLEnterHandlerDelegate" />
+    <langCodeStyleSettingsProvider implementation="com.intellij.lang.jsgraphql.ide.formatter.JSGraphQLLanguageCodeStyleSettingsProvider"/>
+    <codeStyleSettingsProvider implementation="com.intellij.lang.jsgraphql.ide.formatter.JSGraphQLCodeStyleSettingsProvider" />
 
 
     <!-- Find usages -->

src/main/com/intellij/lang/jsgraphql/ide/formatter/JSGraphQLCodeStyleSettingsProvider.java

@@ -51,5 +51,14 @@ private static class JSGraphQLCodeStyleMainPanel extends TabbedLanguageCodeStyle
         public JSGraphQLCodeStyleMainPanel(CodeStyleSettings currentSettings, CodeStyleSettings settings) {
             super(JSGraphQLLanguage.INSTANCE, currentSettings, settings);
         }
+
+        @Override
+        protected void addSpacesTab(CodeStyleSettings settings) {}
+
+        @Override
+        protected void addBlankLinesTab(CodeStyleSettings settings) {}
+
+        @Override
+        protected void addWrappingAndBracesTab(CodeStyleSettings settings) {}
     }
 }

src/main/com/intellij/lang/jsgraphql/ide/formatter/JSGraphQLLanguageCodeStyleSettingsProvider.java

@@ -0,0 +1,77 @@
+/**
+ * Copyright (c) 2015-present, Jim Kynde Meyer
+ * All rights reserved.
+ * <p>
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+package com.intellij.lang.jsgraphql.ide.formatter;
+
+import com.intellij.application.options.IndentOptionsEditor;
+import com.intellij.lang.Language;
+import com.intellij.lang.jsgraphql.JSGraphQLLanguage;
+import com.intellij.openapi.application.ApplicationBundle;
+import com.intellij.psi.codeStyle.CommonCodeStyleSettings;
+import com.intellij.psi.codeStyle.LanguageCodeStyleSettingsProvider;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+
+public class JSGraphQLLanguageCodeStyleSettingsProvider extends LanguageCodeStyleSettingsProvider {
+
+    @NotNull
+    @Override
+    public Language getLanguage() {
+        return JSGraphQLLanguage.INSTANCE;
+    }
+
+    @Nullable
+    @Override
+    public CommonCodeStyleSettings getDefaultCommonSettings() {
+        final CommonCodeStyleSettings defaultSettings = new CommonCodeStyleSettings(getLanguage());
+        CommonCodeStyleSettings.IndentOptions indentOptions = defaultSettings.initIndentOptions();
+        indentOptions.INDENT_SIZE = 4;
+        indentOptions.USE_TAB_CHARACTER = false;
+        return defaultSettings;
+    }
+
+    @Nullable
+    @Override
+    public IndentOptionsEditor getIndentOptionsEditor() {
+        return new IndentOptionsEditor() {
+            protected void addComponents() {
+                addTabOptions();
+                myTabSizeField = new JTextField();
+                myTabSizeLabel = new JLabel();
+                myIndentField = createIndentTextField();
+                myIndentLabel = new JLabel(ApplicationBundle.message("editbox.indent.indent"));
+                add(myIndentLabel, myIndentField);
+            }
+
+            protected void addTabOptions() {
+                myCbUseTab = new JCheckBox("");
+            }
+        };
+    }
+
+    @Override
+    public String getCodeSample(@NotNull SettingsType settingsType) {
+        return "query MyQuery {\n" +
+                "    __schema {\n" +
+                "        types {\n" +
+                "            ...FullType\n" +
+                "        }\n" +
+                "    }\n" +
+                "}\n" +
+                "\n" +
+                "fragment FullType on __Type {\n" +
+                "    # Note: __Type has a lot more fields than this\n" +
+                "    name\n" +
+                "}\n" +
+                "\n" +
+                "mutation MyMutation($input: MyInput!) {\n" +
+                "    # Payload\n" +
+                "}\n";
+    }
+}

src/main/com/intellij/lang/jsgraphql/ide/highlighting/JSGraphQLSyntaxHighlighterFactory.java

@@ -8,17 +8,28 @@
 package com.intellij.lang.jsgraphql.ide.highlighting;
 
 import com.intellij.lang.jsgraphql.schema.JSGraphQLSchemaFileType;
+import com.intellij.openapi.fileTypes.PlainSyntaxHighlighter;
 import com.intellij.openapi.fileTypes.SyntaxHighlighter;
 import com.intellij.openapi.fileTypes.SyntaxHighlighterFactory;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.project.ProjectManager;
 import com.intellij.openapi.vfs.VirtualFile;
 import org.jetbrains.annotations.NotNull;
 
 public class JSGraphQLSyntaxHighlighterFactory extends SyntaxHighlighterFactory {
     @NotNull
     @Override
     public SyntaxHighlighter getSyntaxHighlighter(Project project, VirtualFile virtualFile) {
-        final boolean schema = virtualFile.getFileType() == JSGraphQLSchemaFileType.INSTANCE;
+        final boolean schema = virtualFile != null && virtualFile.getFileType() == JSGraphQLSchemaFileType.INSTANCE;
+        if(project == null) {
+            Project[] openProjects = ProjectManager.getInstance().getOpenProjects();
+            if(openProjects.length > 0) {
+                project = openProjects[0];
+            } else {
+                // can't syntax highlight GraphQL without a project to associate the language service instance to
+                return new PlainSyntaxHighlighter();
+            }
+        }
         return new JSGraphQLSyntaxHighlighter(project, schema);
     }
 }