feat: Add threads option to Main class and update usage message

src/puzzle/Main.java

@@ -16,25 +16,27 @@ public class Main {
    public static class Opts {
       public int seed = 1234;
       public int pop = 18;
-      public int gens = 200;
-      public int tries = 5;
+      public int gens = 300;
       public String wordsPath = "/data/puzzle/pool.txt";
       public double minSimplicity = 0; // 0 means no limit
+      public int threads = Math.max(1, Runtime.getRuntime().availableProcessors());
+      public int tries = threads;
    }
    
    static void usage() {
       System.out.println("""
       Usage:
-        java SwedishGenerator [--seed N] [--pop N] [--gens N] [--tries N] [--words word-list.txt] [--min-simplicity N.N]
+        java SwedishGenerator [--seed N] [--pop N] [--gens N] [--tries N] [--words word-list.txt] [--min-simplicity N.N] [--threads N]
 
       Defaults:
-        --seed 1
+        --seed 1234
         --pop 18
-        --gens 100
-        --tries 50
-        --words /data/pool.txt
+        --gens 1000
+        --tries 5
+        --words /data/puzzle/pool.txt
         --min-simplicity 0 (no limit)
-      """);
+        --threads %d
+      """.formatted(Math.max(1, Runtime.getRuntime().availableProcessors())));
    }
    
    static Opts parseArgs(String[] argv) {
@@ -52,6 +54,7 @@ public class Main {
          else if (a.equals("--tries")) { out.tries = Integer.parseInt(v); i++; }
          else if (a.equals("--words")) { out.wordsPath = v; i++; }
          else if (a.equals("--min-simplicity")) { out.minSimplicity = Double.parseDouble(v); i++; }
+         else if (a.equals("--threads")) { out.threads = Integer.parseInt(v); i++; }
          else throw new IllegalArgumentException("Unknown arg: " + a);
       }
       return out;