From e08cded5f0e5ae80c0d15c7e84def12e579a799f Mon Sep 17 00:00:00 2001
From: "Gregory.Shrago" <gregory.shrago@jetbrains.com>
Date: Tue, 10 Jun 2014 23:43:24 +0400
Subject: [PATCH] show RefCardAction if RefCard is available

---
 .../intellij/ide/actions/RefCardAction.java   | 27 ++++++++++++++-----
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/platform/platform-impl/src/com/intellij/ide/actions/RefCardAction.java b/platform/platform-impl/src/com/intellij/ide/actions/RefCardAction.java
index df50bb85e8fa..a6f1aded0727 100644
--- a/platform/platform-impl/src/com/intellij/ide/actions/RefCardAction.java
+++ b/platform/platform-impl/src/com/intellij/ide/actions/RefCardAction.java
@@ -24,7 +24,8 @@ import com.intellij.openapi.application.PathManager;
 import com.intellij.openapi.application.ex.ApplicationInfoEx;
 import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.util.SystemInfo;
-import org.jetbrains.annotations.NonNls;
+import com.intellij.openapi.util.io.FileUtil;
+import org.jetbrains.annotations.NotNull;
 
 import java.io.File;
 
@@ -32,17 +33,15 @@ import java.io.File;
  * @author Vladimir Kondratyev
  */
 public class RefCardAction extends AnAction implements DumbAware {
-  @NonNls private static final String KEYMAP_URL = PathManager.getHomePath() + "/help/" + (SystemInfo.isMac ? "ReferenceCardForMac.pdf" : "ReferenceCard.pdf");
+  private static final String REF_CARD_PATH = PathManager.getHomePath() + "/help/" + (SystemInfo.isMac ? "ReferenceCardForMac.pdf" : "ReferenceCard.pdf");
 
   public void actionPerformed(AnActionEvent e) {
-    final String url = KEYMAP_URL;
-    File file = new File(url);
+    File file = getRefCardFile();
     if (file.isFile()) {
       BrowserUtil.browse(file);
     }
     else {
-      final ApplicationInfoEx appInfo = ApplicationInfoEx.getInstanceEx();
-      String webUrl = SystemInfo.isMac ? appInfo.getMacKeymapUrl() : appInfo.getWinKeymapUrl();
+      String webUrl = getKeymapUrl();
       if (webUrl != null) {
         BrowserUtil.browse(webUrl);
       }
@@ -50,8 +49,22 @@ public class RefCardAction extends AnAction implements DumbAware {
   }
 
   public void update(AnActionEvent e) {
-    super.update(e);
+    e.getPresentation().setEnabledAndVisible(isRefCardAvailable());
     boolean atWelcome = ActionPlaces.WELCOME_SCREEN.equals(e.getPlace());
     e.getPresentation().setIcon(atWelcome ? AllIcons.General.DefaultKeymap : null);
   }
+
+  private static boolean isRefCardAvailable() {
+    return getRefCardFile().exists() || getKeymapUrl() != null;
+  }
+
+  private static String getKeymapUrl() {
+    final ApplicationInfoEx appInfo = ApplicationInfoEx.getInstanceEx();
+    return SystemInfo.isMac ? appInfo.getMacKeymapUrl() : appInfo.getWinKeymapUrl();
+  }
+
+  @NotNull
+  private static File getRefCardFile() {
+    return new File(FileUtil.toSystemDependentName(REF_CARD_PATH));
+  }
 }