--- a/src/name/blackcap/imageprep/Main.kt	Fri Jul 17 11:48:07 2020 -0700
+++ b/src/name/blackcap/imageprep/Main.kt	Fri Jul 17 14:51:41 2020 -0700
@@ -3,9 +3,17 @@
  */
 package name.blackcap.imageprep
 
-import javax.swing.UIManager
+import java.io.File
 import java.util.logging.Level
 import java.util.logging.Logger
+import javax.swing.UIManager
+import name.blackcap.kcli.CommandLine
+import name.blackcap.kcli.InvalidArgumentException
+import name.blackcap.kcli.Option
+import name.blackcap.kcli.PromptingParser
+import org.apache.commons.cli.HelpFormatter
+import org.apache.commons.cli.Options
+import org.apache.commons.cli.ParseException
 
 object Application {
     /* name we call ourselves */
@@ -30,7 +38,60 @@
     if (OS.type == OS.MAC) {
         System.setProperty("apple.laf.useScreenMenuBar", "true")
     }
+
+    if (Settings.outputToInputDir)
+        Settings.outputTo = System.getProperty("user.dir")
+    val options = Options().apply {
+        addOption(Option<Unit>("?", "help", false, "Print this help message."))
+        addOption(Option<Int>("m", "maxdim", true, "Maximum dimension (default: ${Settings.maxDimension})").apply {
+            default = Settings.maxDimension
+            interpolater = {
+                val ret = try { it.toInt() } catch (e: NumberFormatException) { -1 }
+                if (ret < 1)
+                    throw InvalidArgumentException("Dimension must be a positive integer.")
+                Settings.maxDimension = ret
+                ret
+            }
+        })
+        addOption(Option<File>("o", "output", true, "Output directory (default: ${Settings.outputTo})").apply {
+            default = File(Settings.outputTo)
+            interpolater = {
+                val ret = File(it)
+                if (!ret.exists())
+                    throw InvalidArgumentException("'${it}' does not exist")
+                if (!ret.isDirectory())
+                    throw InvalidArgumentException("'${it}' is not a directory")
+                Settings.outputTo = ret.canonicalPath
+                ret
+            }
+        })
+        addOption(Option<Int>("q", "quality", true, "JPEG quality for output (0-100, default ${Settings.outputQuality})").apply {
+            default = Settings.outputQuality
+            interpolater = {
+                val ret = try { it.toInt() } catch (e: NumberFormatException) { -1 }
+                if (ret < 0 || ret > 100)
+                    throw InvalidArgumentException("Quality must be an integer from 0 to 100, inclusive.")
+                Settings.outputQuality = ret
+                ret
+            }
+        })
+    }
+    val cmdLine: CommandLine? = try {
+        PromptingParser().parse(options, args)
+    } catch (e: ParseException) {
+        System.err.println("${Application.MYNAME}: syntax error - ${e.message}")
+        System.exit(2)
+        null
+    }
+    if (cmdLine!!.hasOption("help")) {
+        val usage = Application.MYNAME + " [--maxdim=integer] [--output=directory] [--quality=integer] file [...]"
+        HelpFormatter().printHelp(usage, options, false);
+        System.exit(0);
+    }
+
     inSwingThread {
         Application.initialize()
+        for (fileName in cmdLine!!.args)
+            RotateDialog.makeDialog(File(fileName))
     }
 }