Add support for presets

app/src/main/kotlin/io/smnp/SMNP.kt

@@ -7,6 +7,7 @@ import io.smnp.cli.model.enumeration.ModulesPrintMode
 import io.smnp.environment.DefaultEnvironment
 import io.smnp.ext.DefaultModuleRegistry
 import io.smnp.interpreter.DefaultInterpreter
+import io.smnp.preset.PresetProvider.providePresetCode
 import io.smnp.type.model.Value
 
 fun main(args: Array<String>): Unit = mainBody {
@@ -19,6 +20,7 @@ fun main(args: Array<String>): Unit = mainBody {
       when {
          file != null -> interpreter.run(file!!, environment, printTokens, printAst, dryRun)
          code != null -> interpreter.run(code!!, environment, printTokens, printAst, dryRun)
+         preset != null -> interpreter.run(providePresetCode(preset!!), environment, printTokens, printAst, dryRun)
          else -> null
       }?.let { it as DefaultEnvironment }?.let { disposedEnvironment ->
          if(loadedModules != null) {

app/src/main/kotlin/io/smnp/cli/model/entity/Arguments.kt

@@ -3,6 +3,7 @@ package io.smnp.cli.model.entity
 import com.xenomachina.argparser.ArgParser
 import com.xenomachina.argparser.default
 import io.smnp.cli.model.enumeration.ModulesPrintMode
+import io.smnp.preset.PresetProvider
 import java.io.File
 
 class Arguments(parser: ArgParser) {
@@ -30,6 +31,14 @@ class Arguments(parser: ArgParser) {
          }
       }
    }
+   val preset by parser.storing(
+      "-p",
+      "--preset",
+      argName = "NAME",
+      help = "load preset by name and execute it. Preset is a predefined snippet of SMNP code that allows user to " +
+         "perform some useful action without having to script it himself. Presets are located in SMNP executable JAR " +
+         "file. Available presets: ${PresetProvider.presets.joinToString()}"
+   ).default<String?>(null)
 
    val code by parser.storing("-c", "--code", help = "inline code to be executed").default<String?>(null)
    val file by parser.positional(

app/src/main/kotlin/io/smnp/error/PresetException.kt

@@ -0,0 +1,3 @@
+package io.smnp.error
+
+class PresetException(message: String?) : SmnpException("Preset error", message)

app/src/main/kotlin/io/smnp/preset/PresetProvider.kt

@@ -0,0 +1,24 @@
+package io.smnp.preset
+
+import io.smnp.error.PresetException
+import java.io.File
+import java.nio.file.Paths
+
+object PresetProvider {
+   private const val PRESETS_DIR = "presets"
+   private val classLoader = javaClass.classLoader
+
+   val presets: List<String>
+      get() = classLoader
+         .getResource("presets.index")
+         ?.readText()
+         ?.trim()
+         ?.split("\n")
+         ?.map { File(it).nameWithoutExtension }
+         ?: throw RuntimeException("Presets index not found")
+
+   fun providePresetCode(name: String) = classLoader
+      .getResource(Paths.get(PRESETS_DIR, "$name.mus").toString())
+      ?.readText()
+      ?: throw PresetException("Preset with name '$name' does not exist")
+}

app/src/main/resources/presets/alert.mus

@@ -0,0 +1,16 @@
+import smnp.music.tools;
+import smnp.text;
+
+infinite = __param__.containsKey("cycles");
+melody = __param__.getOrDefault("melody", "beep");
+
+if(infinite) {
+    cycles = __param__.get("cycles").toInt();
+    if(typeOf(cycles) != "int") {
+        throw "Expected 'cycles' to be of int type";
+    }
+
+    alert(cycles, melody);
+} else {
+    alert(melody);
+}

app/src/main/resources/presets/metronome.mus

@@ -0,0 +1,15 @@
+import smnp.music.tools;
+import smnp.text;
+
+bpm = __param__.getOrDefault("bpm", "120").toInt();
+if(typeOf(bpm) != "int") {
+    throw "Expected 'bpm' to be of int type";
+}
+
+beats = __param__.getOrDefault("beats", "4").toInt();
+if(typeOf(beats) != "int") {
+    throw "Expected 'beats' to be of int type";
+}
+
+metronome(bpm, beats);
+