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>

1 files changed, 7 insertions, 3 deletions

diff --git a/ui-commit.c b/ui-commit.c
index 1aa5d34..4bbb391 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -20,2 +20,3 @@ void cgit_print_commit(char *hex)
         char *tmp;
+        int parents = 0;
 
@@ -77,2 +78,3 @@ void cgit_print_commit(char *hex)
                 html(")</td></tr>");
+                parents++;
         }
@@ -91,5 +93,7 @@ void cgit_print_commit(char *hex)
         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);