README.md

@@ -1,6 +1,18 @@
 # waituntil
 
-This simple tool doubles as a programming exercise for me, as I attempt to learn Kotlin from my perspective as a Java developer and a (hopefully) useful tool for personal use. I will expand this README with details as the project evolves.
+A basic tool for delaying work in the terminal to a specific time. This software was originally
+written in Kotlin and then recently ported to Java.
+
+Usage:
+
+```sh
+java -jar ./waituntil.jar 10:30 ; reboot # Replace reboot with your command
+```
+
+The example above would make the program wait until half past ten AM before exiting and allowing
+the next command to run. The timestamp can be passed in the formats `HH:MM` or `HH:MM:SS` and must
+be in the 24-hour system. Passing dates is not supported but entering a time that has already passed
+will make the software wait until that time on the following day.
 
 ## Copyright / Licensing
 

build.gradle.kts

@@ -1,9 +1,4 @@
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
 plugins {
-    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
-    kotlin("jvm") version "latest.release"
-
     // Apply the application plugin to add support for building a CLI application in Java.
     application
 
@@ -19,44 +14,22 @@ repositories {
     mavenCentral()
 }
 
-dependencies {
-    // Align versions of all Kotlin components
-    implementation(platform(kotlin("bom", "latest.release")))
-
-    // Use the Kotlin standard library.
-    implementation(kotlin("stdlib", "latest.release"))
-
-    // Use the Kotlin test library.
-    testImplementation(kotlin("test", "latest.release"))
-
-    // Use the Kotlin JUnit integration.
-    testImplementation(kotlin("test-junit", "latest.release"))
-}
-
 java {
     sourceCompatibility = JavaVersion.VERSION_17
     targetCompatibility = JavaVersion.VERSION_17
 }
 
-tasks.test {
-    useJUnitPlatform()
-}
-
 tasks.jar {
     manifest {
         attributes(
-            "Implementation-Title" to "waituntil",
+            "Implementation-Title" to "de.jotoho.waituntil",
             "Implementation-Version" to "${project.version}",
-            "Main-Class" to "de.jotoho.waituntil.StartKt"
+            "Main-Class" to "de.jotoho.waituntil.Main"
         )
     }
 }
 
-tasks.withType<KotlinCompile> {
-        kotlinOptions.jvmTarget = "17"
-}
-
 application {
     // Define the main class for the application.
-    mainClass.set("de.jotoho.waituntil.StartKt")
+    mainClass.set("de.jotoho.waituntil.Main")
 }

compile.sh

@@ -1,5 +0,0 @@
-#!/bin/sh
-
-# shellcheck disable=SC2046
-# Word splitting in find results is intentional!
-kotlinc $(find src/main -type f -iname '*.kt') -jvm-target 17 -include-runtime -d waituntil.jar

gradle.properties

@@ -1,2 +1 @@
 org.gradle.daemon=false
-kotlin.code.style=official

run.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-java -jar waituntil.jar $*

settings.gradle.kts

@@ -7,4 +7,4 @@
  * in the user manual at https://docs.gradle.org/7.2/userguide/multi_project_builds.html
  */
 
-rootProject.name = "waituntil"
+rootProject.name = "de.jotoho.waituntil"

src/main/java/de/jotoho/waituntil/GlobalConf.java

@@ -0,0 +1,10 @@
+package de.jotoho.waituntil;
+
+import java.util.Locale;
+
+public record GlobalConf() {
+    public static final String langGerman = "de";
+    public static final String applicationOutputLanguage = (Locale.getDefault().getLanguage().equals(Locale.GERMAN.getLanguage()))
+                                             ? Locale.GERMAN.getLanguage()
+                                             : Locale.ENGLISH.getLanguage();
+}

src/main/java/de/jotoho/waituntil/Main.java

@@ -0,0 +1,51 @@
+package de.jotoho.waituntil;
+
+import java.util.*;
+
+import static de.jotoho.waituntil.GlobalConf.applicationOutputLanguage;
+
+// This file contains the main function and other utility function necessary for interpreting the terminal arguments.
+// See README.md and LICENSE.md for license information
+// Author: Jonas Tobias Hopusch (@jotoho)
+
+public final class Main {
+    public static void main(final String[] args) {
+        final var optionDictionary = Map.of("-h", "--help", "-v", "--version");
+
+        final var options = new HashSet<String>();
+        final var words = new HashSet<String>();
+
+        for (final String arg : args) {
+            if (arg.startsWith("--")) {
+                options.add(arg.substring(2));
+            } else if (arg.startsWith("-")) {
+                if (optionDictionary.containsKey(arg))
+                    options.add(optionDictionary.get(arg).substring(2));
+                else
+                    System.err.println("Short-hand '$arg' does not exist. Ignoring!");
+            } else {
+                words.add(arg);
+            }
+        }
+
+        if (options.contains("help")) {
+            switch (applicationOutputLanguage) {
+                case GlobalConf.langGerman -> System.out.println("Hilfe kommt noch. (Nicht implementiert)");
+                default -> System.out.println("Help is yet to come. (Not implemented)");
+            }
+        } else if (options.contains("version")) {
+            final var thisPackage = Main.class.getPackage();
+            final var appVersion = thisPackage.getImplementationVersion() != null ? thisPackage.getImplementationVersion() :"UNKNOWN";
+            System.out.println("de.jotoho.waituntil version $appVersion");
+        } else if (words.size() == 1) {
+            final var target = TimeCalculator.calculateAndAnnounceTargetTime(words.iterator().next());
+            Sleep.waitUntilTimeStamp(target);
+        } else {
+            switch (applicationOutputLanguage) {
+                case GlobalConf.langGerman -> System.err.println("FATAL: Es wurde exact ein nicht-flag Argument erwartet. (" + words.size() + " erhalten)");
+                default -> System.err.println("FATAL: Expected one non-flag argument. (Got " + words.size() + ")");
+            }
+            System.exit(1);
+        }
+    }
+}

src/main/java/de/jotoho/waituntil/Sleep.java

@@ -0,0 +1,32 @@
+package de.jotoho.waituntil;
+
+import java.time.Instant;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.FormatStyle;
+import java.time.temporal.ChronoUnit;
+import java.util.*;
+
+import java.lang.Math;
+
+public final class Sleep {
+    public static void waitUntilTimeStamp(ZonedDateTime timestamp) {
+        try {
+            Thread.sleep(Math.max(0, Instant.now().until(timestamp, ChronoUnit.MILLIS)));
+        } catch (final InterruptedException ignored) {
+        }
+
+        final String formattedTimeStamp =
+                DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG)
+                        .withZone(TimeZone.getDefault().toZoneId())
+                        .format(Instant.now());
+
+        final String msg = switch (GlobalConf.applicationOutputLanguage) {
+            case GlobalConf.langGerman -> "Erfolgreich bis %s gewartet!";
+            default -> "Successfully waited until %s";
+        };
+
+        final String msgWithData = msg.formatted(formattedTimeStamp);
+        System.err.println(msgWithData);
+    }
+}

src/main/java/de/jotoho/waituntil/TimeCalculator.java

@@ -0,0 +1,40 @@
+package de.jotoho.waituntil;
+
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.FormatStyle;
+import java.util.*;
+
+public final class TimeCalculator {
+
+    public static ZonedDateTime calculateAndAnnounceTargetTime(final String userTimeInputRaw) {
+        final var userTimeInputRelative = LocalTime.parse(userTimeInputRaw);
+        final var userTimeInputAbsolute =
+                ZonedDateTime.of(
+                        LocalDate.now(),
+                        userTimeInputRelative,
+                        TimeZone.getDefault().toZoneId()
+                );
+
+        final var userTimeInputFinal = (Instant.now().isBefore(userTimeInputAbsolute.toInstant()))
+                                                ? userTimeInputAbsolute
+                                                : userTimeInputAbsolute.plusDays(1);
+
+        final var formattedTimeStamp =
+                userTimeInputFinal.format(
+                        DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG)
+                );
+
+        final String msg = switch (GlobalConf.applicationOutputLanguage) {
+            case GlobalConf.langGerman -> "Dieses Program wird bis zum %s warten."
+                                            .formatted(formattedTimeStamp);
+            default -> "WaitUntil will suspend until %s".formatted(formattedTimeStamp);
+        };
+        System.out.println(msg);
+
+        return userTimeInputFinal;
+    }
+}

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

@@ -1,64 +0,0 @@
-package de.jotoho.waituntil
-
-import java.util.*
-import kotlin.system.exitProcess
-
-// This file contains the main function and other utility function necessary for interpreting the terminal arguments.
-// 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
-
-// For accessing package information
-object DummyClass
-
-fun main(args: Array<String>) {
-    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('-')) {
-            if (optionDictionary.containsKey(arg))
-                options.add(optionDictionary[arg]!!.substring(startIndex = 2))
-            else
-                System.err.println("Short-hand '$arg' does not exist. Ignoring!")
-        } else
-            words.add(arg)
-    }
-
-    if (options.contains("help")) {
-        when (applicationOutputLanguage) {
-            langGerman -> println("Hilfe kommt noch. (Nicht implementiert)")
-            else -> {
-                println("Help is yet to come. (Not implemented)")
-            }
-        }
-    } else if (options.contains("version")) {
-        when (applicationOutputLanguage) {
-            langGerman -> {
-                val thisPackage = DummyClass.javaClass.`package`
-                val appVersion = thisPackage.implementationVersion ?: "UNKNOWN"
-                println("waituntil version $appVersion")
-            }
-        }
-    } else if (words.size == 1) {
-        val target = calculateAndAnnounceTargetTime(words.iterator().next())
-        waitUntilTimeStamp(target)
-    } else {
-        when (applicationOutputLanguage) {
-            langGerman -> System.err.println("FATAL: Es wurde exact ein nicht-flag Argument erwartet. (${words.size} erhalten)")
-            else -> {
-                System.err.println("FATAL: Expected one non-flag argument. (Got ${words.size})")
-            }
-        }
-        exitProcess(1)
-    }
-}

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

@@ -1,24 +0,0 @@
-package de.jotoho.waituntil
-
-import java.time.Instant
-import java.time.ZonedDateTime
-import java.time.format.DateTimeFormatter
-import java.time.format.FormatStyle
-import java.time.temporal.ChronoUnit
-import java.util.*
-
-fun waitUntilTimeStamp(timestamp: ZonedDateTime) {
-    Thread.sleep(Instant.now().until(timestamp, ChronoUnit.MILLIS).coerceAtLeast(0))
-
-    val formattedTimeStamp: String =
-            DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG)
-                    .withZone(TimeZone.getDefault().toZoneId())
-                    .format(Instant.now())
-
-    when (applicationOutputLanguage) {
-        langGerman -> System.err.println("Erfolgreich bis $formattedTimeStamp gewartet!")
-        else -> {
-            System.err.println("Successfully waited until $formattedTimeStamp")
-        }
-    }
-}

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

@@ -1,41 +0,0 @@
-package de.jotoho.waituntil
-
-import java.time.Instant
-import java.time.LocalDate
-import java.time.LocalTime
-import java.time.ZonedDateTime
-import java.time.format.DateTimeFormatter
-import java.time.format.FormatStyle
-import java.util.*
-
-fun calculateAndAnnounceTargetTime(userTimeInputRaw: String): ZonedDateTime {
-        val userTimeInputRelative = LocalTime.parse(userTimeInputRaw)
-        val userTimeInputAbsolute =
-                        ZonedDateTime.of(
-                                        LocalDate.now(),
-                                        userTimeInputRelative,
-                                        TimeZone.getDefault().toZoneId()
-                        )
-
-        val userTimeInputFinal =
-                        if (Instant.now().isBefore(userTimeInputAbsolute.toInstant()))
-                                        userTimeInputAbsolute
-                        else userTimeInputAbsolute.plusDays(1)
-
-        val formattedTimeStamp =
-                        userTimeInputFinal.format(
-                                        DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG)
-                        )
-
-        when (applicationOutputLanguage) {
-                langGerman ->
-                                System.err.println(
-                                                "Dieses Program wird bis zum $formattedTimeStamp warten."
-                                )
-                else -> {
-                        println("WaitUntil will suspend until $formattedTimeStamp")
-                }
-        }
-
-        return userTimeInputFinal
-}