Merge pull request 'Add `--version` commandline flag and support executable jar files with Gradle' (#12) from version-and-fat-jars into master

Reviewed-on: #12

.gitignore

@@ -39,3 +39,4 @@ build
 /de/jotoho/
 /META-INF
 /.idea
+*.zst

build.gradle.kts

@@ -6,6 +6,9 @@ plugins {
 
     // Apply the application plugin to add support for building a CLI application in Java.
     application
+
+    // For generating fat jars
+    id("com.github.johnrengelman.shadow") version "latest.release"
 }
 
 group = "de.jotoho"
@@ -39,6 +42,16 @@ tasks.test {
     useJUnitPlatform()
 }
 
+tasks.jar {
+    manifest {
+        attributes(
+            "Implementation-Title" to "waituntil",
+            "Implementation-Version" to "${project.version}",
+            "Main-Class" to "de.jotoho.waituntil.StartKt"
+        )
+    }
+}
+
 tasks.withType<KotlinCompile> {
         kotlinOptions.jvmTarget = "16"
 }

src/main/kotlin/de/jotoho/waituntil/Start.kt

@@ -7,28 +7,30 @@ import kotlin.system.exitProcess
 // See README.md and LICENSE.md for license information
 // Author: Jonas Tobias Hopusch (@jotoho)
 
+
 val langGerman: String = Locale.GERMAN.language
 val applicationOutputLanguage: String = if (Locale.getDefault().language.equals(Locale.GERMAN.language))
-                                    Locale.GERMAN.language
-                                    else Locale.ENGLISH.language
+                                        Locale.GERMAN.language
+                                        else Locale.ENGLISH.language
+
+// For accessing package information
+object DummyClass
 
 fun main(args: Array<String>) {
-    val optionDictionary = mapOf(Pair("-h", "--help"))
+    val optionDictionary = mapOf(Pair("-h", "--help"), Pair("-v", "--version"))
 
     val options = HashSet<String>()
     val words = HashSet<String>()
 
     for (arg in args) {
         if (arg.startsWith("--")) {
-            options.add(arg.substring(startIndex=2))
-        }
-        else if (arg.startsWith('-')) {
+            options.add(arg.substring(startIndex = 2))
+        } else if (arg.startsWith('-')) {
             if (optionDictionary.containsKey(arg))
-                options.add(optionDictionary[arg]!!.substring(startIndex=2))
+                options.add(optionDictionary[arg]!!.substring(startIndex = 2))
             else
                 System.err.println("Short-hand '$arg' does not exist. Ignoring!")
-        }
-        else
+        } else
             words.add(arg)
     }
 
@@ -39,12 +41,18 @@ fun main(args: Array<String>) {
                 println("Help is yet to come. (Not implemented)")
             }
         }
-    }
-    else if (words.size == 1) {
+    } else if (options.contains("version")) {
+        when (applicationOutputLanguage) {
+            langGerman -> {
+                val thisPackage = DummyClass.javaClass.`package`
+                val appVersion = thisPackage.implementationVersion ?: "UNKNOWN"
+                println("waituntil version $appVersion")
+            }
+        }
+    } else if (words.size == 1) {
         val target = calculateAndAnnounceTargetTime(words.iterator().next())
         waitUntilTimeStamp(target)
-    }
-    else {
+    } else {
         when (applicationOutputLanguage) {
             langGerman -> System.err.println("FATAL: Es wurde exact ein nicht-flag Argument erwartet. (${words.size} erhalten)")
             else -> {

src/main/kotlin/de/jotoho/waituntil/timecalc.kt

@@ -6,7 +6,7 @@ import java.time.LocalTime
 import java.time.ZonedDateTime
 import java.time.format.DateTimeFormatter
 import java.time.format.FormatStyle
-import java.util.TimeZone
+import java.util.*
 
 fun calculateAndAnnounceTargetTime(userTimeInputRaw: String): ZonedDateTime {
         val userTimeInputRelative = LocalTime.parse(userTimeInputRaw)