Introduce code formatting + git hooks

Adds the spotless gradle plugin for a formatting abstraction; prettier
for formatting Java, Java properties, YAML, and Markdown; and pre-commit
to tie the aforementioned into a pre-commit hook.

.github/workflows/test.yml

@@ -1,23 +1,23 @@
 name: Continuous Testing
 
 on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
+    push:
+        branches: ["main"]
+    pull_request:
+        branches: ["main"]
 
 permissions:
-  contents: read
+    contents: read
 
 jobs:
-  test:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v4
-    - uses: actions/setup-java@v3
-      with:
-        java-version: '8'
-        distribution: 'temurin'
-    - uses: gradle/gradle-build-action@v2
-    - run: gradle wrapper
-    - run: ./gradlew test
+    test:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v4
+            - uses: actions/setup-java@v3
+              with:
+                  java-version: "11"
+                  distribution: "temurin"
+            - uses: gradle/gradle-build-action@v2
+            - run: gradle wrapper
+            - run: ./gradlew check

.greclipse.properties

@@ -0,0 +1,4 @@
+groovy.formatter.remove.unnecessary.semicolons = true
+org.eclipse.jdt.core.formatter.indent_empty_lines = false
+org.eclipse.jdt.core.formatter.tabulation.char = space
+org.eclipse.jdt.core.formatter.tabulation.size = 4

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+    - repo: local
+      hooks:
+          - id: spotless
+            name: spotless
+            language: system
+            entry: ./gradlew spotlessApply
+            pass_filenames: false
+            always_run: true
+          - id: git-diff
+            name: git-diff
+            language: system
+            entry: git --no-pager diff --color --exit-code
+            always_run: true

.prettierrc.yaml

@@ -0,0 +1,4 @@
+plugins:
+    - prettier-plugin-java
+    - prettier-plugin-properties
+tabWidth: 4

CHANGELOG.md

@@ -1,5 +1,6 @@
 # CHANGELOG
 
 **v0.1.0:**
-- Initial implementation of [the spec](https://github.com/sqids/sqids-spec)
-- Packaging & cleanup
+
+-   Initial implementation of [the spec](https://github.com/sqids/sqids-spec)
+-   Packaging & cleanup

README.md

@@ -1,43 +1,43 @@
 # [Sqids Java](https://sqids.org/java)
 
-[Sqids](https://sqids.org/java) (*pronounced "squids"*) is a small library that lets you **generate unique IDs from
+[Sqids](https://sqids.org/java) (_pronounced "squids"_) is a small library that lets you **generate unique IDs from
 numbers**. It's good for link shortening, fast & URL-safe ID generation and decoding back into numbers for quicker
 database lookups.
 
 Features:
 
-- **Encode multiple numbers** - generate short IDs from one or several non-negative numbers
-- **Quick decoding** - easily decode IDs back into numbers
-- **Unique IDs** - generate unique IDs by shuffling the alphabet once
-- **ID padding** - provide minimum length to make IDs more uniform
-- **URL safe** - auto-generated IDs do not contain common profanity
-- **Randomized output** - Sequential input provides nonconsecutive IDs
-- **Many implementations** - Support for [40+ programming languages](https://sqids.org/)
+-   **Encode multiple numbers** - generate short IDs from one or several non-negative numbers
+-   **Quick decoding** - easily decode IDs back into numbers
+-   **Unique IDs** - generate unique IDs by shuffling the alphabet once
+-   **ID padding** - provide minimum length to make IDs more uniform
+-   **URL safe** - auto-generated IDs do not contain common profanity
+-   **Randomized output** - Sequential input provides nonconsecutive IDs
+-   **Many implementations** - Support for [40+ programming languages](https://sqids.org/)
 
 ## 🧰 Use-cases
 
 Good for:
 
-- Generating IDs for public URLs (eg: link shortening)
-- Generating IDs for internal systems (eg: event tracking)
-- Decoding for quicker database lookups (eg: by primary keys)
+-   Generating IDs for public URLs (eg: link shortening)
+-   Generating IDs for internal systems (eg: event tracking)
+-   Decoding for quicker database lookups (eg: by primary keys)
 
 Not good for:
 
-- Sensitive data (this is not an encryption library)
-- User IDs (can be decoded revealing user count)
-
+-   Sensitive data (this is not an encryption library)
+-   User IDs (can be decoded revealing user count)
 
 ## System Requirements
-Java 8 or higher is required.
 
+Java 8 or higher is required.
 
 ## 🚀 Getting started
 
 Download and Import Sqids via:
 
 ```java
 import org.sqids.Sqids;
+
 ```
 
 ## 👩‍💻 Examples
@@ -55,7 +55,7 @@ List<Long> numbers=sqids.decode(id); // [1, 2, 3]
 > important to your design that IDs are canonical, you have to manually re-encode decoded numbers and check that the
 > generated ID matches.
 
-Enforce a *minimum* length for IDs:
+Enforce a _minimum_ length for IDs:
 
 ```java
 Sqids sqids=Sqids.builder()
@@ -87,4 +87,4 @@ List<Long> numbers=sqids.decode(id); // [1, 2, 3]
 
 ## 📝 License
 
-[MIT](LICENSE)
+[MIT](LICENSE)

build.gradle

@@ -1,4 +1,6 @@
 plugins {
+    id 'com.diffplug.spotless' version '6.23.1'
+    id 'com.github.node-gradle.node' version '7.0.1'
     id 'java-library'
     id 'maven-publish'
     id 'signing'
@@ -7,7 +9,7 @@ plugins {
 group = 'org.sqids'
 version = '0.1.0-SNAPSHOT'
 
-String rootArtifactiId = 'sqids'
+String rootArtifactId = 'sqids'
 String projectUrl = 'https://sqids.org/java'
 
 repositories {
@@ -17,7 +19,7 @@ repositories {
 dependencies {
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
-    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 test {
@@ -34,20 +36,19 @@ java {
 
 publishing {
     publications {
-
         mavenJava(MavenPublication) {
             groupId = group
-            artifactId = rootArtifactiId
+            artifactId = rootArtifactId
             version = version
             from components.java
             pom {
                 name = 'Sqids'
                 description = 'Generate short YouTube-looking IDs from numbers.'
                 url = projectUrl
                 properties = [
-                    "parent.groupId": "org.sonatype.oss",
-                    "parent.artifactId": "oss-parent",
-                    "parent.version": "7"
+                    'parent.groupId': 'org.sonatype.oss',
+                    'parent.artifactId': 'oss-parent',
+                    'parent.version': '7'
                 ]
                 licenses {
                     license {
@@ -72,12 +73,12 @@ publishing {
     }
     repositories {
         maven {
-            def releasesRepoUrl = 'https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/'
-            def snapshotsRepoUrl = 'https://s01.oss.sonatype.org/content/repositories/snapshots/'
+            String releasesRepoUrl = 'https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/'
+            String snapshotsRepoUrl = 'https://s01.oss.sonatype.org/content/repositories/snapshots/'
             url = version.endsWith('SNAPSHOT') ? snapshotsRepoUrl : releasesRepoUrl
             credentials {
-                username "${System.getenv("SONATYPE_USERNAME")}"
-                password "${System.getenv("SONATYPE_PASSWORD")}"
+                username System.getenv('SONATYPE_USERNAME')
+                password System.getenv('SONATYPE_PASSWORD')
             }
         }
     }
@@ -86,3 +87,35 @@ publishing {
         sign publishing.publications.mavenJava
     }
 }
+
+node {
+    download = true
+}
+
+String nodeSetup = 'nodeSetup'
+String npmSetup = 'npmSetup'
+
+spotless {
+    format 'prettier', {
+        target '**/*.java', '**/*.properties', '**/*.md', '**/*.yml', '**/*.yaml'
+        targetExclude 'bin/**/*', 'gradle/**/*'
+
+        boolean isWindows = System.getProperty('os.name').toLowerCase().contains('windows')
+        String nodeExec = isWindows ? '/node.exe' : '/bin/node'
+        String npmExec = isWindows ? '/npm.cmd' : '/bin/npm'
+
+        prettier(['prettier': '3.1.0', 'prettier-plugin-java': '2.2.0', 'prettier-plugin-properties': '0.3.0'])
+        .npmInstallCache()
+        .npmExecutable("${tasks.named(npmSetup).get().npmDir.get()}${npmExec}")
+        .nodeExecutable("${tasks.named(nodeSetup).get().nodeDir.get()}${nodeExec}")
+        .configFile('.prettierrc.yaml')
+    }
+
+    groovyGradle {
+        greclipse().configFile('.greclipse.properties')
+    }
+}
+
+tasks.named('spotlessPrettier').configure { task ->
+    task.dependsOn(nodeSetup, npmSetup)
+}