Adding buildScript

cli/build.gradle

@@ -16,6 +16,9 @@ dependencies {
     /**
      * Logging
      */
+    // https://mvnrepository.com/artifact/org.slf4j/slf4j-api
+    implementation 'org.slf4j:slf4j-api:1.7.36'
+
     // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl
     runtimeOnly 'org.apache.logging.log4j:log4j-slf4j-impl:2.19.0'
 

cli/src/main/groovy/com/jessebrault/ssg/StaticSiteGeneratorCli.groovy

@@ -1,5 +1,6 @@
 package com.jessebrault.ssg
 
+import com.jessebrault.ssg.buildscript.GroovyBuildScriptRunner
 import com.jessebrault.ssg.part.GspPartRenderer
 import com.jessebrault.ssg.part.PartFilePartsProvider
 import com.jessebrault.ssg.part.PartType
@@ -13,9 +14,13 @@ import com.jessebrault.ssg.text.MarkdownFrontMatterGetter
 import com.jessebrault.ssg.text.MarkdownTextRenderer
 import com.jessebrault.ssg.text.TextType
 import com.jessebrault.ssg.text.TextFileTextsProvider
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
 
 class StaticSiteGeneratorCli {
 
+    private static final Logger logger = LoggerFactory.getLogger(StaticSiteGeneratorCli)
+
     static void main(String[] args) {
         def markdownText = new TextType(['.md'], new MarkdownTextRenderer(), new MarkdownFrontMatterGetter())
         def gspTemplate = new TemplateType(['.gsp'], new GspTemplateRenderer())
@@ -39,6 +44,16 @@ class StaticSiteGeneratorCli {
                 specialPagesProviderGetter: { Config config -> new SpecialPageFileSpecialPagesProvider(config.specialPageTypes, config.specialPagesDir) }
         )
 
+        def globals = [:]
+
+        if (new File('build.groovy').exists()) {
+            logger.info('found buildScript: build.groovy')
+            def buildScriptRunner = new GroovyBuildScriptRunner()
+            buildScriptRunner.runBuildScript(config, globals)
+            logger.info('after running buildScript, config: {}', config)
+            logger.info('after running buildScript, globals: {}', globals)
+        }
+
         def ssg = new SimpleStaticSiteGenerator(config)
         ssg.generate(new File('build'))
     }

lib/build.gradle

@@ -13,6 +13,9 @@ dependencies {
     // https://mvnrepository.com/artifact/org.apache.groovy/groovy-templates
     implementation 'org.apache.groovy:groovy-templates:4.0.7'
 
+    // https://mvnrepository.com/artifact/org.apache.groovy/groovy-yaml
+    implementation 'org.apache.groovy:groovy-yaml:4.0.7'
+
     // https://mvnrepository.com/artifact/org.commonmark/commonmark
     implementation 'org.commonmark:commonmark:0.21.0'
 

lib/src/main/groovy/com/jessebrault/ssg/buildscript/BuildScriptBase.groovy

@@ -0,0 +1,47 @@
+package com.jessebrault.ssg.buildscript
+
+import com.jessebrault.ssg.Config
+import groovy.transform.TupleConstructor
+
+abstract class BuildScriptBase extends Script {
+
+    @TupleConstructor(includeFields = true, defaults = false)
+    static class GlobalsConfigurator {
+
+        private final Map globals
+
+        @Override
+        Object getProperty(String propertyName) {
+            this.globals[propertyName]
+        }
+
+        @Override
+        void setProperty(String propertyName, Object newValue) {
+            this.globals.put(propertyName, newValue)
+        }
+
+    }
+
+    Config config
+    Map globals
+
+    void config(
+            @DelegatesTo(value = Config, strategy = Closure.DELEGATE_FIRST)
+            Closure configClosure
+    ) {
+        configClosure.setDelegate(this.config)
+        configClosure.setResolveStrategy(Closure.DELEGATE_FIRST)
+        configClosure.run()
+    }
+
+    void globals(
+            @DelegatesTo(value = GlobalsConfigurator, strategy = Closure.DELEGATE_FIRST)
+            Closure globalsClosure
+    ) {
+        def globalsConfigurator = new GlobalsConfigurator(this.globals)
+        globalsClosure.setDelegate(globalsConfigurator)
+        globalsClosure.setResolveStrategy(Closure.DELEGATE_FIRST)
+        globalsClosure.run()
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/buildscript/BuildScriptRunner.groovy

@@ -0,0 +1,7 @@
+package com.jessebrault.ssg.buildscript
+
+import com.jessebrault.ssg.Config
+
+interface BuildScriptRunner {
+    void runBuildScript(Config config, Map globals)
+}

lib/src/main/groovy/com/jessebrault/ssg/buildscript/GroovyBuildScriptRunner.groovy

@@ -0,0 +1,23 @@
+package com.jessebrault.ssg.buildscript
+
+import com.jessebrault.ssg.Config
+import org.codehaus.groovy.control.CompilerConfiguration
+
+class GroovyBuildScriptRunner implements BuildScriptRunner {
+
+    @Override
+    void runBuildScript(Config config, Map globals) {
+        Objects.requireNonNull(config)
+        Objects.requireNonNull(globals)
+        def engine = new GroovyScriptEngine([new File('.').toURI().toURL()] as URL[])
+        engine.config = new CompilerConfiguration().tap {
+            scriptBaseClass = 'com.jessebrault.ssg.buildscript.BuildScriptBase'
+        }
+        def buildScript = engine.createScript('build.groovy', new Binding())
+        assert buildScript instanceof BuildScriptBase
+        buildScript.config = config
+        buildScript.globals = globals
+        buildScript.run()
+    }
+
+}