Composition page structure.

pages/groovy/com/jessebrault/site/composition/CompositionPage.groovy

@@ -2,18 +2,27 @@ package com.jessebrault.site.composition
 
 import com.jessebrault.site.util.TitleMaker
 import com.jessebrault.ssg.view.WvcPageView
+import groovy.transform.Canonical
 import jakarta.inject.Inject
 
 import java.time.format.DateTimeFormatter
 
 class CompositionPage extends WvcPageView {
 
+    @Canonical
+    static class AlternateVersion {
+        final String versionName
+        final String path
+    }
+
     Composition composition
     private final TitleMaker titleMaker
+    private final CompositionContainer compositionContainer
 
     @Inject
-    CompositionPage(TitleMaker titleMaker) {
+    CompositionPage(TitleMaker titleMaker, CompositionContainer compositionContainer) {
         this.titleMaker = titleMaker
+        this.compositionContainer = compositionContainer
     }
 
     String getTitle() {
@@ -24,4 +33,10 @@ class CompositionPage extends WvcPageView {
         composition.date.format(DateTimeFormatter.ofPattern('yyyy'))
     }
 
+    Set<AlternateVersion> getAlternateVersions() {
+        compositionContainer.getAlternateVersions(composition).collect {
+            new AlternateVersion(it.version, "/compositions/${it.slug}")
+        }
+    }
+
 }

pages/resources/com/jessebrault/site/composition/CompositionPageTemplate.wvc

@@ -11,6 +11,13 @@ import com.jessebrault.site.StandardPage
             <WhenNotNull item={composition.version} render={<p class="version">$it</p>} />
             <p class="year">$compositionYear</p>
             <p class="instrumentation">$composition.instrumentation</p>
+            <WhenNotEmpty items={alternateVersions}>
+                <p>Alternate versions:
+                    <ul>
+                        <Each items={alternateVersions} transform={<li><a href={it.path}>${it.versionName}</a></li>} />
+                    </ul>
+                </p>
+            </WhenNotEmpty>
         </section>
         <section class="composition-text">
             ${composition.text.render()}

src/main/groovy/com/jessebrault/site/composition/CompositionContainer.groovy

@@ -35,4 +35,8 @@ class CompositionContainer {
         this.compositions.findAll { it.categories.contains(category) }
     }
 
+    Set<Composition> getAlternateVersions(Composition composition) {
+        this.compositions.findAll { it.title == composition.title && it.version != composition.version }
+    }
+
 }