Show commit title, description, author and date on commit detail page

Added GitService.getCommitInfo() using getFullMessage() to preserve
the full commit body. Controller splits the message into title (first
line) and body (remainder) for separate display in the template.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/main/java/be/seeseepuff/webgit/controller/RepoController.java

@@ -103,6 +103,14 @@ public class RepoController
 		model.addAttribute("name", name);
 		model.addAttribute("hash", hash);
 		model.addAttribute("shortHash", hash.substring(0, Math.min(7, hash.length())));
+		var info = gitService.getCommitInfo(name, hash);
+		model.addAttribute("commitInfo", info);
+		String fullMsg = info.message() != null ? info.message().trim() : "";
+		int newline = fullMsg.indexOf('\n');
+		String title = newline >= 0 ? fullMsg.substring(0, newline).trim() : fullMsg;
+		String body = newline >= 0 ? fullMsg.substring(newline).trim() : "";
+		model.addAttribute("commitTitle", title);
+		model.addAttribute("commitBody", body);
 		model.addAttribute("diffs", gitService.getCommitDiff(name, hash));
 		return "commit";
 	}

src/main/java/be/seeseepuff/webgit/service/GitService.java

@@ -434,6 +434,33 @@ public class GitService
 		return sb.toString().stripTrailing();
 	}
 
+	public CommitInfo getCommitInfo(String name, String commitHash) throws IOException
+	{
+		try (Git git = openRepository(name))
+		{
+			Repository repo = git.getRepository();
+			ObjectId commitId = repo.resolve(commitHash);
+			try (var walk = new org.eclipse.jgit.revwalk.RevWalk(repo))
+			{
+				RevCommit commit = walk.parseCommit(commitId);
+				DateTimeFormatter fmt = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm")
+					.withZone(ZoneId.systemDefault());
+				List<String> parents = Arrays.stream(commit.getParents())
+					.map(p -> p.getId().abbreviate(7).name())
+					.toList();
+				return new CommitInfo(
+					commit.getId().getName(),
+					commit.getId().abbreviate(7).name(),
+					commit.getFullMessage(),
+					commit.getAuthorIdent().getName(),
+					fmt.format(Instant.ofEpochSecond(commit.getCommitTime())),
+					parents,
+					""
+				);
+			}
+		}
+	}
+
 	public List<DiffInfo> getCommitDiff(String name, String commitHash) throws IOException
 	{
 		try (Git git = openRepository(name))

src/main/resources/templates/commit.html

@@ -8,6 +8,20 @@
 
 <p><a th:href="@{/repo/{name}/commits(name=${name})}">&lt; Back to commits</a></p>
 
+<table border="0" cellpadding="4" cellspacing="0">
+<tr>
+<td><b>Author:</b></td>
+<td th:text="${commitInfo.author}"></td>
+</tr>
+<tr>
+<td><b>Date:</b></td>
+<td th:text="${commitInfo.date}"></td>
+</tr>
+</table>
+
+<h3 th:text="${commitTitle}"></h3>
+<pre th:if="${!commitBody.isEmpty()}" th:text="${commitBody}"></pre>
+
 <table border="0" cellpadding="4" cellspacing="0">
 <tr>
 <td>

src/test/java/be/seeseepuff/webgit/controller/RepoControllerTest.java

@@ -246,6 +246,9 @@ class RepoControllerTest
 	@Test
 	void commitDetailShowsDiff() throws Exception
 	{
+		when(gitService.getCommitInfo("myrepo", "abc1234")).thenReturn(
+			new be.seeseepuff.webgit.model.CommitInfo("abc1234abc1234", "abc1234", "Fix bug\n\nDetails here", "Alice", "2024-01-01 12:00", List.of(), "")
+		);
 		when(gitService.getCommitDiff("myrepo", "abc1234")).thenReturn(List.of(
 			new be.seeseepuff.webgit.model.DiffInfo("ADD", "/dev/null", "file.txt", "+hello")
 		));
@@ -254,6 +257,7 @@ class RepoControllerTest
 			.andExpect(status().isOk())
 			.andExpect(view().name("commit"))
 			.andExpect(model().attribute("hash", "abc1234"))
+			.andExpect(content().string(org.hamcrest.Matchers.containsString("Fix bug")))
 			.andExpect(content().string(org.hamcrest.Matchers.containsString("file.txt")));
 	}
 

src/test/java/be/seeseepuff/webgit/service/GitServiceTest.java

@@ -349,6 +349,19 @@ class GitServiceTest
 		assertNotNull(commits.getFirst().graphLine());
 	}
 
+	@Test
+	void getCommitInfoReturnsDetails() throws GitAPIException, IOException
+	{
+		gitService.cloneRepository(bareRemote.toUri().toString(), "myrepo");
+
+		var commits = gitService.listCommits("myrepo");
+		var info = gitService.getCommitInfo("myrepo", commits.getFirst().hash());
+		assertNotNull(info);
+		assertTrue(info.message().contains("Initial commit"));
+		assertNotNull(info.author());
+		assertNotNull(info.date());
+	}
+
 	@Test
 	void listCommitsGraphLineShowsBranchingCorrectly() throws GitAPIException, IOException
 	{