Added support for switching the terminal to bold mode.

src/main/java/net/rubygrapefruit/platform/Main.java

@@ -15,6 +15,11 @@ public class Main {
             Terminal terminal = terminalAccess.getTerminal(TerminalAccess.Output.Stdout);
             TerminalSize terminalSize = terminal.getTerminalSize();
             System.out.println("* terminal size: " + terminalSize.getCols() + " cols x " + terminalSize.getRows() + " rows");
+            System.out.print("[normal] ");
+            terminal.bold();
+            System.out.print("[bold]");
+            terminal.normal();
+            System.out.println(" [normal]");
         }
     }
 }

src/main/java/net/rubygrapefruit/platform/Platform.java

@@ -4,6 +4,7 @@ import net.rubygrapefruit.platform.internal.*;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.PrintStream;
 
 /**
  * Provides access to the native integrations. Use {@link #get(Class)} to load a particular integration.
@@ -25,6 +26,10 @@ public class Platform {
                 } catch (IOException e) {
                     throw new RuntimeException(e);
                 }
+                int nativeVersion = NativeLibraryFunctions.getVersion();
+                if (nativeVersion != NativeLibraryFunctions.VERSION) {
+                    throw new NativeException(String.format("Unexpected native library version loaded. Expected %s, was %s.", nativeVersion, NativeLibraryFunctions.VERSION));
+                }
                 loaded = true;
             }
         }
@@ -71,6 +76,8 @@ public class Platform {
     }
 
     private static class DefaultTerminalAccess implements TerminalAccess {
+        private static Output currentlyOpen;
+
         @Override
         public boolean isTerminal(Output output) {
             return PosixTerminalFunctions.isatty(output.ordinal());
@@ -78,18 +85,35 @@ public class Platform {
 
         @Override
         public Terminal getTerminal(Output output) {
-            if (!isTerminal(output)) {
-                throw new NativeException(String.format("%s is not attached to a terminal.", output));
+            if (currentlyOpen != null) {
+                throw new UnsupportedOperationException("Currently only one output can be used as a terminal.");
             }
-            return new DefaultTerminal(output);
+
+            DefaultTerminal terminal = new DefaultTerminal(output);
+            terminal.init();
+
+            currentlyOpen = output;
+            return terminal;
         }
     }
 
     private static class DefaultTerminal implements Terminal {
         private final TerminalAccess.Output output;
+        private final PrintStream stream;
 
         public DefaultTerminal(TerminalAccess.Output output) {
             this.output = output;
+            stream = output == TerminalAccess.Output.Stdout ? System.out : System.err;
+        }
+
+        public void init() {
+            stream.flush();
+            FunctionResult result = new FunctionResult();
+            TerminfoFunctions.initTerminal(output.ordinal(), result);
+            if (result.isFailed()) {
+                throw new NativeException(String.format("Could not open terminal. Errno is %d.",
+                        result.getErrno()));
+            }
         }
 
         @Override
@@ -103,5 +127,37 @@ public class Platform {
             }
             return terminalSize;
         }
+
+        @Override
+        public Terminal bold() {
+            stream.flush();
+            FunctionResult result = new FunctionResult();
+            TerminfoFunctions.bold(output.ordinal(), result);
+            if (result.isFailed()) {
+                throw new NativeException(String.format("Could not switch to bold mode. Errno is %d.",
+                        result.getErrno()));
+            }
+            return this;
+        }
+
+        @Override
+        public Terminal bold(String output) {
+            bold();
+            stream.print(output);
+            normal();
+            return this;
+        }
+
+        @Override
+        public Terminal normal() {
+            stream.flush();
+            FunctionResult result = new FunctionResult();
+            TerminfoFunctions.normal(output.ordinal(), result);
+            if (result.isFailed()) {
+                throw new NativeException(String.format("Could not switch to normal mode. Errno is %d.",
+                        result.getErrno()));
+            }
+            return this;
+        }
     }
 }

src/main/java/net/rubygrapefruit/platform/Terminal.java

@@ -2,4 +2,19 @@ package net.rubygrapefruit.platform;
 
 public interface Terminal {
     TerminalSize getTerminalSize();
+
+    /**
+     * Switches the terminal to bold mode.
+     */
+    Terminal bold();
+
+    /**
+     * Switches the terminal to bold mode, outputs the given text, then switches to normal mode.
+     */
+    Terminal bold(String output);
+
+    /**
+     * Switches the terminal to normal mode.
+     */
+    Terminal normal();
 }

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

@@ -0,0 +1,7 @@
+package net.rubygrapefruit.platform.internal;
+
+public class NativeLibraryFunctions {
+    public static final int VERSION = 1;
+
+    public static native int getVersion();
+}

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

@@ -0,0 +1,12 @@
+package net.rubygrapefruit.platform.internal;
+
+public class TerminfoFunctions {
+    /**
+     * Sets up terminal info and switches output to normal mode.
+     */
+    public static native void initTerminal(int filedes, FunctionResult result);
+
+    public static native void bold(int filedes, FunctionResult result);
+
+    public static native void normal(int filedes, FunctionResult result);
+}