Feature/issue 30 migrate to gradle

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: maven
+    directory: "/"
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 10
+    labels:
+      - "dependencies"

.github/workflows/gradle-build.yml

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+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: Java ${{ matrix.java_version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java_version: [ '17' ]
+        # java_version: ['8', '11', '17']
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java_version }}
+          distribution: 'temurin'
+      - name: Run a build
+        run: ./gradlew clean build --info

.github/workflows/publish-to-github-packages.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+# GitHub recommends pinning actions to a commit SHA.
+# To get a newer version, you will need to update the SHA.
+# You can also reference a tag or branch, but the action may change without warning.
+
+name: Publish package to GitHub Packages
+on:
+    release:
+        types: [ created ]
+jobs:
+    publish:
+        runs-on: ubuntu-latest
+        permissions:
+            contents: read
+            packages: write
+        steps:
+            -   uses: actions/checkout@v4
+            -   uses: actions/setup-java@v3
+                with:
+                    java-version: '17'
+                    distribution: 'temurin'
+            -   name: Validate Gradle wrapper
+                uses: gradle/wrapper-validation-action@ccb4328a959376b642e027874838f60f8e596de3
+            -   name: Publish package
+                uses: gradle/gradle-build-action@749f47bda3e44aa060e82d7b3ef7e40d953bd629
+                with:
+                    arguments: publish
+                env:
+                    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,11 +1,16 @@
 .classpath
 .settings
 .project
-.idea
+.gradle
 workspace.xml
 bin
 target
-src/main/java/com/joestelmach/natty/generated/*
+build/
+src/main/java/org/natty/generated/*
 src/main/java/*.tokens
-src/main/antlr3/com/joestelmach/natty/generated/DebugDateParser.g
-src/main/antlr3/com/joestelmach/natty/generated/DebugDateWalker.g
+src/main/antlr/org/natty/generated/DebugDateParser.g
+src/main/antlr/org/natty/generated/DebugDateWalker.g
+
+# IntelliJ Idea
+*.iml
+.idea

README.md

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+## What
+
+Natty is a natural language date parser written in Java. Given a date
+expression, natty will apply standard language recognition and translation
+techniques to produce a list of corresponding dates with optional parse and
+syntax information.
+
+## History
+
+Originally written by Joel Stelmach at https://github.com/joestelmach/natty and developed between 2010 and 2017.
+Abandoned since then.
+
+## Usage
+
+Maven:
+
+```
+<dependency>
+  <groupId>io.github.natty-parser</groupId>
+  <artifactId>natty</artifactId>
+  <version>1.0.3</version>
+</dependency>
+```
+
+or [consult maven.org](https://search.maven.org/artifact/io.github.natty-parser/natty) for other build systems.
+
+## Idea behind the fork
+
+Started with [a thread in the original project](https://github.com/joestelmach/natty/issues/274). The aim is to try
+providing maintenance for the library.
+
+Plan / Priorities (as of November 2022):
+
+1. ~~Release version `1.0.0` with (possibly) the same code as the fork root, but under new name, consider renaming
+   packages and artifacts to use `natty-parser` as the moniker, etc.~~
+   DONE
+2. ~~Fix the tests (some are failing?).~~ DONE
+3. ~~Set up basic technicalities of the fork - Maven release process, CI (Continuous Integration), etc.~~ DONE
+4. Start accepting contributions (PRs), encourage the community to
+   solve [issues reported in the original repo](https://github.com/joestelmach/natty/issues)
+5. Consider switching to Gradle (as this is a build tool which is modern and I am familiar with)
+6. Decide on the overall vision of the project - at this point it's hard to tell, but I think a conscious decision on
+   what is gonna be supported would be
+   great - i.e. focus on i18n, customization, stability, or what?
+
+## Known issues from the parent project
+
+See [issues](issues.md)
+
+## Commitment
+
+I hope for open collaboration and contributions from others. To me it's totally a side-project, not the core activity.
+Yet, I can commit to being (fairly) responsive and inclusive.
+
+## Contibutions
+
+Are more than welcome. Feel free to reach out (e.g. by creating an issue in this repo) to offer your support and ideas.
+I am happy to include more
+maintainers. Tag @mccartney if no response for 2-3 days (I might have missed that).
+
+I see this project potentially being welcoming to many, incl. quite junior and inexperienced developers, who would like
+to learn and contribute.
+
+## Build
+
+Builds are done using the gradle wrapper. All that's need is a JDK (8 or upwards) to be installed on the machine.
+
+```shell
+./gradlew build
+```

build.gradle

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+plugins {
+    id 'java-library'
+    id 'maven-publish'
+    id 'antlr'
+
+    alias(libs.plugins.nebula.release)
+    alias(libs.plugins.lombok)
+}
+
+repositories {
+    mavenLocal()
+    maven {
+        url = uri('https://repo.maven.apache.org/maven2/')
+    }
+}
+
+dependencies {
+    api(
+            libs.antlr.runtime,
+            libs.ical4j,
+            libs.slf4j.api
+    )
+
+    antlr libs.antlr
+
+    testImplementation(
+            //  libs.slf4j.log4j12, // required for Level
+            libs.junit,
+            libs.junit.jupiter.api,
+            libs.junit.jupiter.params,
+            libs.antlr.gunit,
+            libs.assertj.core
+    )
+    testRuntimeOnly(
+            // libs.slf4j.simple,
+            libs.log4j2,
+            libs.junit.jupiter.engine,
+            libs.junit.vintage.engine,
+            libs.junit.platform.engine,
+            //libs.logback.classic
+    )
+
+
+}
+
+description = 'Natty Date Parser'
+
+generateGrammarSource {
+
+    arguments += ["-visitor",
+                  "-listener",
+                  "-long-messages",
+                  "-lib", "src/main/antlr/org/natty/generated/imports"
+    ]
+    outputDirectory = file("${project.buildDir}/generated-src/antlr/")
+    source "src/main/antlr"
+    include "org/natty/generated/DateLexer.g"
+    include "org/natty/generated/DateParser.g"
+
+}
+
+publishing {
+    publications {
+        maven(MavenPublication) {
+            from(components.java)
+        }
+    }
+}
+
+test {
+    useJUnitPlatform()
+    testLogging {
+        showStandardStreams = true
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+}
+
+tasks.withType(Javadoc).configureEach {
+    options.encoding = 'UTF-8'
+}
+
+tasks.compileJava {
+    dependsOn tasks.generateGrammarSource
+}

gradle.properties

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+group=io.github.natty-parser
+
+# nebula release settings
+release.scope=patch
+release.stage=SNAPSHOT

gradle/libs.versions.toml

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+# This file was generated by the Gradle 'init' task.
+# https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
+
+[versions]
+logback-classic = "1.3.14"
+log4j2 = "2.24.3"
+junit = "4.13.2"
+antlr = "3.5.3"
+ical4j = "3.2.14"
+slf4j = "2.0.17"
+junit-jupiter = "5.13.0"
+junit-platform = "1.13.0"
+assertj = "3.27.3"
+
+nebula-release = "19.0.10"
+lombok = "8.13.1"
+
+[libraries]
+logback-classic = { module = "ch.qos.logback:logback-classic", version.ref = "logback-classic" }
+log4j2 = { module = "org.apache.logging.log4j:log4j-slf4j2-impl", version.ref = "log4j2" }
+
+junit = { module = "junit:junit", version.ref = "junit" }
+antlr-runtime = { module = "org.antlr:antlr-runtime", version.ref = "antlr" }
+antlr = { module = "org.antlr:antlr", version.ref = "antlr" }
+antlr-gunit = { module = "org.antlr:gunit", version.ref = "antlr" }
+ical4j = { module = "org.mnode.ical4j:ical4j", version.ref = "ical4j" }
+slf4j-api = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
+slf4j-log4j12 = { module = "org.slf4j:slf4j-log4j12", version.ref = "slf4j" }
+slf4j-simple = { module = "org.slf4j:slf4j-simple", version.ref = "slf4j" }
+junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }
+junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit-jupiter" }
+junit-jupiter-params = { module = "org.junit.jupiter:junit-jupiter-params", version.ref = "junit-jupiter" }
+
+junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit-jupiter" }
+junit-vintage-engine = { module = "org.junit.vintage:junit-vintage-engine", version.ref = "junit-jupiter" }
+# ... existing libraries ...
+assertj-core = { module = "org.assertj:assertj-core", version.ref = "assertj" }
+junit-platform-engine = { module = "org.junit.platform:junit-platform-launcher", version.ref = "junit-platform" }
+
+
+
+[plugins]
+nebula-release = { id = "nebula.release", version.ref = "nebula-release" }
+lombok = { id = "io.freefair.lombok", version.ref = "lombok" }

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists