Merge pull request #264 from hsz/263-NoSuchMethodError-com.intellij.u…

…til.containers.ContainerUtil.getFirstItem

Fixed #263 - NoSuchMethodError: com.intellij.util.containers.ContainerUtil.getFirstItem

src/mobi/hsz/idea/gitignore/util/Utils.java

@@ -502,4 +502,16 @@ public static <T> List<T> intersection(@NotNull Collection<? extends T> collecti
     public static <T> List<T> notNullize(@Nullable List<T> list) {
         return list == null ? ContainerUtil.<T>newArrayList() : list;
     }
+
+    /**
+     * Method cloned from {@link ContainerUtil#getFirstItem(List)} because of NoSuchMethodError exception
+     * errors related to the some API changes.
+     *
+     * @param items method to check
+     * @param <T> container type
+     * @return not null container
+     */
+    public static <T> T getFirstItem(@Nullable List<T> items) {
+        return items == null || items.isEmpty() ? null : items.get(0);
+    }
 }

src/mobi/hsz/idea/gitignore/util/exec/ExternalExec.java

@@ -127,7 +127,7 @@ private static String bin(@NotNull IgnoreLanguage language) {
     @Nullable
     private static <T> T runForSingle(@NotNull IgnoreLanguage language, @NotNull String command,
                                       @Nullable VirtualFile directory, @NotNull final ExecutionOutputParser<T> parser) {
-        return ContainerUtil.getFirstItem(run(language, command, directory, parser));
+        return Utils.getFirstItem(run(language, command, directory, parser));
     }
 
     /**