version test added; log error and result during version parsing updated

plugins/hg4idea/src/org/zmlx/hg4idea/command/HgVersionCommand.java

@@ -27,7 +27,8 @@ import java.util.regex.Pattern;
 public class HgVersionCommand {
 
   private static final Logger LOGGER = Logger.getInstance(HgVersionCommand.class);
-  private static final Pattern HG_VERSION_PATTERN = Pattern.compile(".+\\(\\s*version\\s+([0-9]+\\.[0-9]*)\\+?([0-9]*)[0-9\\.]*\\s*\\)\\s*");
+  private static final Pattern HG_VERSION_PATTERN =
+    Pattern.compile(".+\\(\\s*version\\s+([0-9]+\\.[0-9]*)\\+?([0-9]*)[0-9\\.]*\\s*\\)\\s*");
 
   public Double getVersion(String executable, boolean isRunViaBash) {
     String hgExecutable = executable == null ? null : executable.trim();
@@ -56,6 +57,10 @@ public class HgVersionCommand {
     if (matcher.matches()) {
       return Double.valueOf(matcher.group(1).concat(matcher.group(2)));
     }
-    return null;
+    if (versionResult.getOutputLines().isEmpty()) {
+      return null;
+    }
+    LOGGER.error("Couldn't identify hg version: " + versionResult.getOutputLines());
+    return new Double(0);
   }
 }

plugins/hg4idea/testSrc/hg4idea/test/version/HgVersionTest.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2000-2013 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package hg4idea.test.version;
+
+import hg4idea.test.HgPlatformTest;
+import org.jetbrains.annotations.NotNull;
+import org.zmlx.hg4idea.HgVcs;
+import org.zmlx.hg4idea.command.HgVersionCommand;
+
+/**
+ * @author Nadya Zabrodina
+ */
+public class HgVersionTest extends HgPlatformTest {
+
+  @NotNull private HgVcs myVcs;
+
+  @Override
+  protected void setUp() throws Exception {
+    super.setUp();
+    HgVcs vcs = HgVcs.getInstance(myProject);
+    assertNotNull(vcs);
+    myVcs = vcs;
+  }
+
+  public void testVersionCommandForCurrentHgVersion() {
+    Double version =
+      new HgVersionCommand().getVersion(myVcs.getGlobalSettings().getHgExecutable(), myVcs.getGlobalSettings().isRunViaBash());
+    assertNotNull(version);
+    assertTrue(version > 0);
+  }
+}