Show a failed-badge behind report links on the artifact index

Each listed report link now carries the failures counter parsed from the
report's Gradle-style index.html (id="failures" info box); reports with
failures get a red "N failed" badge, so a red build reveals which report to
open without clicking through all of them. Pages without such a counter
(Jacoco, profile, documentation) stay unmarked. A full-text FAILED scan was
deliberately not used: even green hsadmin-ng builds contain the word in
embedded test output.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/main/kotlin/de/hoennig/gittally/server/UiController.kt

@@ -209,8 +209,9 @@ class UiController(
     /**
      * The browsable `index.html` pages under `reports/`, shallowest first; pages nested
      * below an already-listed report index are skipped — like the legacy artifact index.
+     * Each entry carries the report's failures counter for the failed-badge.
      */
-    private fun reportIndexes(artifactDir: Path): List<String> {
+    private fun reportIndexes(artifactDir: Path): List<ReportIndexView> {
         val reportsDir = artifactDir.resolve("reports")
         if (!Files.isDirectory(reportsDir)) {
             return emptyList()
@@ -234,6 +235,26 @@ class UiController(
             knownDirs += dir
             topmost += relativeIndex
         }
-        return topmost
+        return topmost.map { ReportIndexView(path = it, failures = reportFailures(reportsDir.resolve(it))) }
+    }
+
+    /**
+     * The failures counter of a Gradle-style HTML test report index
+     * (`<div class="infoBox" id="failures"><div class="counter">N</div>…`);
+     * null for report pages without one, e.g. Jacoco or profile reports.
+     */
+    private fun reportFailures(indexFile: Path): Int? =
+        try {
+            FAILURES_COUNTER
+                .find(Files.readString(indexFile))
+                ?.groupValues
+                ?.get(1)
+                ?.toIntOrNull()
+        } catch (_: Exception) {
+            null
+        }
+
+    companion object {
+        private val FAILURES_COUNTER = Regex("""id="failures">\s*<div class="counter">(\d+)""")
     }
 }

src/main/kotlin/de/hoennig/gittally/server/UiViews.kt

@@ -126,6 +126,16 @@ data class BuildRowView(
     }
 }
 
+/**
+ * One report link of the artifact index. [failures] is the failures counter of a
+ * Gradle-style HTML report index page; null when the page declares none (e.g. Jacoco),
+ * so only real test reports get a failed-badge.
+ */
+data class ReportIndexView(
+    val path: String,
+    val failures: Int?,
+)
+
 /** One card of the current-builds view; the live log is fetched by `gittally.js`. */
 data class CurrentBuildView(
     val branch: String,

src/main/resources/templates/artifact.html

@@ -62,8 +62,10 @@
         <h2>Build Artifacts</h2>
         <ul th:if="${!#lists.isEmpty(reportIndexes)}">
             <li th:each="report : ${reportIndexes}">
-                <a th:href="${filesBase} + '/reports/' + ${report}" target="_blank"
-                   rel="noopener noreferrer" th:text="'reports/' + ${report}">reports/tests/index.html</a>
+                <a th:href="${filesBase} + '/reports/' + ${report.path}" target="_blank"
+                   rel="noopener noreferrer" th:text="'reports/' + ${report.path}">reports/tests/index.html</a>
+                <span th:if="${report.failures != null and report.failures > 0}" class="status status-failed"
+                      th:text="${report.failures} + ' failed'">2 failed</span>
             </li>
         </ul>
         <p th:if="${#lists.isEmpty(reportIndexes)}" class="muted">

src/test/kotlin/de/hoennig/gittally/server/UiControllerTest.kt

@@ -15,6 +15,9 @@ import de.hoennig.gittally.metrics.MetricAggregate
 import de.hoennig.gittally.metrics.SystemMetrics
 import de.hoennig.gittally.metrics.SystemMetricsCollector
 import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain
+import io.kotest.matchers.string.shouldNotContain
 import io.mockk.clearMocks
 import io.mockk.every
 import org.hamcrest.Matchers.containsString
@@ -233,6 +236,40 @@ class UiControllerTest : FunSpec() {
                 ).andExpect(content().string(not(containsString("reports/tests/test/packages/index.html"))))
         }
 
+        test("report links carry a failed-badge from the report's failures counter") {
+            val artifactDir = Files.createDirectories(tempDir.resolve("main-abc123-key"))
+            Files.createDirectories(artifactDir.resolve("reports/tests/test"))
+            Files.writeString(
+                artifactDir.resolve("reports/tests/test/index.html"),
+                """<div class="infoBox" id="failures">
+                <div class="counter">2</div>
+                <p>failures</p></div>""",
+            )
+            Files.createDirectories(artifactDir.resolve("reports/tests/unitTest"))
+            Files.writeString(
+                artifactDir.resolve("reports/tests/unitTest/index.html"),
+                """<div class="infoBox" id="failures">
+                <div class="counter">0</div>
+                <p>failures</p></div>""",
+            )
+            Files.createDirectories(artifactDir.resolve("reports/jacoco"))
+            Files.writeString(artifactDir.resolve("reports/jacoco/index.html"), "<html>no counter</html>")
+            every { repository.history() } returns listOf(successResult)
+            every { artifactStore.artifactDir("main-abc123-key") } returns artifactDir
+
+            val page =
+                mockMvc
+                    .perform(get("/builds/main-abc123-key"))
+                    .andExpect(status().isOk)
+                    .andReturn()
+                    .response.contentAsString
+
+            page shouldContain "2 failed"
+            page shouldNotContain "0 failed"
+            // exactly one badge: the report with failures, none for the clean or counter-less reports
+            Regex(""" failed</span>""").findAll(page).count() shouldBe 1
+        }
+
         test("artifact index of a pruned build explains the missing artifacts") {
             every { repository.history() } returns listOf(successResult)
             every { artifactStore.artifactDir("main-abc123-key") } returns null