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>

2 files changed, 22 insertions, 3 deletions

diff --git a/tests/t0105-commit.sh b/tests/t0105-commit.sh
index aa2bf33..4e1236b 100755
--- a/tests/t0105-commit.sh
+++ b/tests/t0105-commit.sh
@@ -16,7 +16,22 @@ run_test 'find commit msg' 'grep -e "<div class=.commit-msg.></div>" trash/tmp'
 run_test 'find diffstat' 'grep -e "<table summary=.diffstat. class=.diffstat.>" trash/tmp'
 
 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
diff --git a/ui-commit.c b/ui-commit.c
index 1aa5d34..4bbb391 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -15,12 +15,13 @@ void cgit_print_commit(char *hex)
 {
 	struct commit *commit, *parent;
 	struct commitinfo *info;
 	struct commit_list *p;
 	unsigned char sha1[20];
 	char *tmp;
+	int parents = 0;
 
 	if (!hex)
 		hex = ctx.qry.head;
 
 	if (get_sha1(hex, sha1)) {
 		cgit_print_error(fmt("Bad object id: %s", hex));
@@ -72,12 +73,13 @@ void cgit_print_commit(char *hex)
 		cgit_commit_link(sha1_to_hex(p->item->object.sha1), NULL, NULL,
 				 ctx.qry.head, sha1_to_hex(p->item->object.sha1));
 		html(" (");
 		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'>");
 		cgit_print_snapshot_links(ctx.qry.repo, ctx.qry.head,
 					  hex, ctx.repo->snapshots);
 		html("</td></tr>");
@@ -86,13 +88,15 @@ void cgit_print_commit(char *hex)
 	html("<div class='commit-subject'>");
 	html_txt(info->subject);
 	html("</div>");
 	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);
 }