ui-commit: handle root commits

Both cgit_print_diff() and cgit_diff_tree() handles root commits nicely,
but cgit_print_commit() forgot to check the case of 0 parents.

This fixes it, and adds tests to avoid future regressions.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

tests/t0105-commit.sh

@@ -19,4 +19,19 @@ run_test 'find diff summary' '
 	 grep -e "1 files changed, 1 insertions, 0 deletions" trash/tmp
 '
 
+run_test 'get root commit' '
+	 root=$(cd trash/repos/foo && git rev-list --reverse HEAD | head -1) &&
+	 cgit_url "foo/commit&id=$root" >trash/tmp &&
+	 grep "</html>" trash/tmp
+'
+
+run_test 'root commit contains diffstat' '
+	 grep "<a href=./foo/diff/file-1.>file-1</a>" trash/tmp
+'
+
+run_test 'root commit contains diff' '
+	 grep ">diff --git a/file-1 b/file-1<" trash/tmp &&
+	 grep -e "<div class=.add.>+1</div>" trash/tmp
+'
+
 tests_done

ui-commit.c

@@ -18,6 +18,7 @@ void cgit_print_commit(char *hex)
 	struct commit_list *p;
 	unsigned char sha1[20];
 	char *tmp;
+	int parents = 0;
 
 	if (!hex)
 		hex = ctx.qry.head;
@@ -75,6 +76,7 @@ void cgit_print_commit(char *hex)
 		cgit_diff_link("diff", NULL, NULL, ctx.qry.head, hex,
 			       sha1_to_hex(p->item->object.sha1), NULL);
 		html(")</td></tr>");
+		parents++;
 	}
 	if (ctx.repo->snapshots) {
 		html("<tr><th>download</th><td colspan='2' class='sha1'>");
@@ -89,9 +91,11 @@ void cgit_print_commit(char *hex)
 	html("<div class='commit-msg'>");
 	html_txt(info->msg);
 	html("</div>");
-	if (!(commit->parents && commit->parents->next &&
-	      commit->parents->next->next)) {
-		tmp = sha1_to_hex(commit->parents->item->object.sha1);
+	if (parents < 3) {
+		if (parents)
+			tmp = sha1_to_hex(commit->parents->item->object.sha1);
+		else
+			tmp = NULL;
 		cgit_print_diff(ctx.qry.sha1, tmp, NULL);
 	}
 	cgit_free_commitinfo(info);