Add whole folder optimisation command

deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/Main.java

@@ -3,7 +3,7 @@
 import picocli.CommandLine;
 import picocli.CommandLine.Command;
 
-@Command(name = "deft4j", version = "deft4j v1.0.0-beta-4", subcommands = { Optimise.class, ConvertZip.class })
+@Command(name = "deft4j", version = "deft4j v1.0.0-beta-4", subcommands = { Optimise.class, OptimiseFolder.class, ConvertZip.class })
 public class Main {
     public static void main(String[] args) {
         final int exitCode = new CommandLine(new Main()).execute(args);

deft4j-cmd/src/main/java/com/github/NeRdTheNed/deft4j/cmd/OptimiseFolder.java

@@ -0,0 +1,59 @@
+package com.github.NeRdTheNed.deft4j.cmd;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import com.github.NeRdTheNed.deft4j.cmd.CMDUtil.RecompressMode;
+import com.github.NeRdTheNed.deft4j.container.ContainerUtil;
+import com.github.NeRdTheNed.deft4j.container.DeflateFilesContainer;
+import com.github.NeRdTheNed.deft4j.container.RawDeflateFile;
+
+import picocli.CommandLine;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Option;
+import picocli.CommandLine.Parameters;
+
+@Command(name = "optimiseFolder", mixinStandardHelpOptions = true, description = "In-place whole folder deflate stream optimiser")
+class OptimiseFolder implements Callable<Integer> {
+    @Parameters(index = "0", description = "The folder to optimise")
+    private Path inputFolder;
+
+    @Option(names = { "--recompress-mode", "--mode", "-m" }, defaultValue = "NONE", description = "Enable various levels of recompression. Default: ${DEFAULT-VALUE}. Valid values: ${COMPLETION-CANDIDATES}")
+    private RecompressMode recompressMode;
+
+    @Override
+    public Integer call() throws Exception {
+        final CMDUtil deft = new CMDUtil(recompressMode);
+        boolean didOpt = true;
+
+        try
+            (final Stream<Path> files = Files.isDirectory(inputFolder) ? Files.walk(inputFolder) : Stream.of(inputFolder)) {
+            for (final Path overwriteInput : files.collect(Collectors.toList())) {
+                DeflateFilesContainer detectedFormat;
+
+                if (!Files.isRegularFile(overwriteInput) || ((detectedFormat = ContainerUtil.getContainerForPath(overwriteInput)) == null) || (detectedFormat instanceof RawDeflateFile)) {
+                    continue;
+                }
+
+                try {
+                    if (!deft.optimiseFile(overwriteInput, overwriteInput, null, false)) {
+                        didOpt = false;
+                    }
+                } catch (final Exception e) {
+                    System.err.println("Error when optimising file " + overwriteInput);
+                    e.printStackTrace();
+                    didOpt = false;
+                }
+            }
+        }
+
+        if (!didOpt) {
+            System.err.println("Failed to optimise " + inputFolder);
+        }
+
+        return didOpt ? CommandLine.ExitCode.OK : 1;
+    }
+}