Add files from jline for diff visibility

src/main/java/jline/AnsiWindowsTerminal.java

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+/*
+ * Copyright (C) 2009 the original author(s).
+ *
+ * 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.
+ *
+ * MODIFICATIONS: methods to deal with wrapping the output stream.
+ */
+
+package jline;
+
+import org.fusesource.jansi.AnsiConsole;
+import org.fusesource.jansi.AnsiOutputStream;
+import org.fusesource.jansi.WindowsAnsiOutputStream;
+
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStream;
+
+/**
+ * ANSI-supported {@link WindowsTerminal}.
+ *
+ * @since 2.0
+ */
+public class AnsiWindowsTerminal
+    extends WindowsTerminal
+{
+    private final boolean ansiSupported = detectAnsiSupport();
+
+    @Override
+    public OutputStream wrapOutIfNeeded(OutputStream out) {
+        return wrapOutputStream(out);
+    }
+
+    /**
+     * Returns an ansi output stream handler. We return whatever was
+     * passed if we determine we cannot handle ansi based on Kernel32 calls.
+     * 
+     * @return an @{link AltWindowAnsiOutputStream} instance or the passed 
+     * stream.
+     */
+    private static OutputStream wrapOutputStream(final OutputStream stream) {
+        String os = System.getProperty("os.name");
+        if( os.startsWith("Windows") ) {
+            // On windows we know the console does not interpret ANSI codes..
+            try {
+                return new WindowsAnsiOutputStream(stream);
+            } catch (Throwable ignore) {
+                // this happens when JNA is not in the path.. or
+                // this happens when the stdout is being redirected to a file.
+            }
+            // Use the ANSIOutputStream to strip out the ANSI escape sequences.
+            return new AnsiOutputStream(stream);
+        }
+        return stream;
+    }
+
+    private static boolean detectAnsiSupport() {
+        OutputStream out = AnsiConsole.wrapOutputStream(new ByteArrayOutputStream());
+        try {
+            out.close();
+        }
+        catch (Exception e) {
+            // ignore;
+        }
+        return out instanceof WindowsAnsiOutputStream;
+    }
+
+    public AnsiWindowsTerminal() throws Exception {
+        super();
+    }
+
+    @Override
+    public boolean isAnsiSupported() {
+        return ansiSupported;
+    }
+
+    @Override
+    public boolean hasWeirdWrap() {
+        return false;
+    }
+}