From 20ca7667b2c71c9a37eab29d57df16a57f3e3fd2 Mon Sep 17 00:00:00 2001
From: irengrig <Irina.Chernushina@jetbrains.com>
Date: Wed, 14 Jul 2010 16:13:46 +0400
Subject: [PATCH] SVN: one-click merge: "Merge from" to be shown only when SVN
 is active (cherry picked from commit
 ce75d751f1fe4b4b5838e7e61f2f63086464c317)

---
 .../idea/svn/dialogs/MergeFromAction.java     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/plugins/svn4idea/src/org/jetbrains/idea/svn/dialogs/MergeFromAction.java b/plugins/svn4idea/src/org/jetbrains/idea/svn/dialogs/MergeFromAction.java
index ba84209cbcc9..c4c63a2cee30 100644
--- a/plugins/svn4idea/src/org/jetbrains/idea/svn/dialogs/MergeFromAction.java
+++ b/plugins/svn4idea/src/org/jetbrains/idea/svn/dialogs/MergeFromAction.java
@@ -20,12 +20,15 @@ import com.intellij.openapi.actionSystem.DataContext;
 import com.intellij.openapi.actionSystem.PlatformDataKeys;
 import com.intellij.openapi.project.DumbAwareAction;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vcs.ProjectLevelVcsManager;
 import com.intellij.openapi.vcs.changes.ui.ChangesViewContentManager;
+import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.wm.ToolWindow;
 import com.intellij.openapi.wm.ToolWindowManager;
 import com.intellij.ui.content.Content;
 import com.intellij.ui.content.ContentManager;
 import org.jetbrains.idea.svn.SvnBundle;
+import org.jetbrains.idea.svn.SvnVcs;
 
 public class MergeFromAction extends DumbAwareAction {
   public MergeFromAction() {
@@ -34,6 +37,7 @@ public class MergeFromAction extends DumbAwareAction {
 
   @Override
   public void actionPerformed(AnActionEvent e) {
+    if (! isEnabled(e)) return;
     final DataContext dc = e.getDataContext();
     final Project project = PlatformDataKeys.PROJECT.getData(dc);
     if (project == null) return;
@@ -50,4 +54,20 @@ public class MergeFromAction extends DumbAwareAction {
       }
     }
   }
+
+  @Override
+  public void update(AnActionEvent e) {
+    final DataContext dc = e.getDataContext();
+    final Project project = PlatformDataKeys.PROJECT.getData(dc);
+    if (project == null || project.isDefault()) return;
+    e.getPresentation().setVisible(isEnabled(e));
+  }
+
+  private boolean isEnabled(AnActionEvent e) {
+    final DataContext dc = e.getDataContext();
+    final Project project = PlatformDataKeys.PROJECT.getData(dc);
+    if (project == null || project.isDefault()) return false;
+    final VirtualFile[] files = ProjectLevelVcsManager.getInstance(project).getRootsUnderVcs(SvnVcs.getInstance(project));
+    return files != null && files.length > 0;
+  }
 }