Added a Terminal implementation that uses ANSI control characters.

src/main/java/net/rubygrapefruit/platform/internal/AnsiTerminal.java

@@ -0,0 +1,162 @@
+package net.rubygrapefruit.platform.internal;
+
+import net.rubygrapefruit.platform.NativeException;
+import net.rubygrapefruit.platform.Terminal;
+import net.rubygrapefruit.platform.TerminalSize;
+import net.rubygrapefruit.platform.Terminals;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class AnsiTerminal extends AbstractTerminal {
+    private static final byte[] BOLD = "\u001b[1m".getBytes();
+    private static final byte[] RESET = "\u001b[0m".getBytes();
+    private static final byte[] START_OF_LINE = "\u001b[0E".getBytes();
+    private static final byte[] CLEAR_TO_END_OF_LINE = "\u001b[0K".getBytes();
+    private final Terminals.Output output;
+    private final OutputStream outputStream;
+    private Color foreground;
+
+    public AnsiTerminal(OutputStream outputStream, Terminals.Output output) {
+        this.outputStream = outputStream;
+        this.output = output;
+    }
+
+    @Override
+    public String toString() {
+        return String.format("ANSI terminal on %s", getOutputDisplay());
+    }
+
+    private String getOutputDisplay() {
+        return output.toString().toLowerCase();
+    }
+
+    @Override
+    protected void init() {
+    }
+
+    public boolean supportsTextAttributes() {
+        return true;
+    }
+
+    public boolean supportsColor() {
+        return true;
+    }
+
+    public boolean supportsCursorMotion() {
+        return true;
+    }
+
+    public TerminalSize getTerminalSize() throws NativeException {
+        return new MutableTerminalSize();
+    }
+
+    public Terminal foreground(Color color) throws NativeException {
+        try {
+            String esc = String.format("\u001b[%sm", 30 + color.ordinal());
+            outputStream.write(esc.getBytes());
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not set foreground color on %s.", getOutputDisplay()), e);
+        }
+        foreground = color;
+        return this;
+    }
+
+    public Terminal bold() throws NativeException {
+        try {
+            outputStream.write(BOLD);
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not switch to bold output on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal normal() throws NativeException {
+        try {
+            outputStream.write(RESET);
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not switch to normal output on %s.", getOutputDisplay()), e);
+        }
+        if (foreground != null) {
+            foreground(foreground);
+        }
+        return this;
+    }
+
+    public Terminal reset() throws NativeException {
+        try {
+            outputStream.write(RESET);
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not reset output on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal cursorLeft(int count) throws NativeException {
+        try {
+            String esc = String.format("\u001b[%sD", count);
+            outputStream.write(esc.getBytes());
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not move cursor on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal cursorRight(int count) throws NativeException {
+        try {
+            String esc = String.format("\u001b[%sC", count);
+            outputStream.write(esc.getBytes());
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not move cursor on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal cursorUp(int count) throws NativeException {
+        try {
+            String esc = String.format("\u001b[%sA", count);
+            outputStream.write(esc.getBytes());
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not move cursor on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal cursorDown(int count) throws NativeException {
+        try {
+            String esc = String.format("\u001b[%sB", count);
+            outputStream.write(esc.getBytes());
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not move cursor on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal cursorStartOfLine() throws NativeException {
+        try {
+            outputStream.write(START_OF_LINE);
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not move cursor on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+
+    public Terminal clearToEndOfLine() throws NativeException {
+        try {
+            outputStream.write(CLEAR_TO_END_OF_LINE);
+            outputStream.flush();
+        } catch (IOException e) {
+            throw new NativeException(String.format("Could not clear to end of line on %s.", getOutputDisplay()), e);
+        }
+        return this;
+    }
+}