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
@@ -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
diff --git a/ui-commit.c b/ui-commit.c
index 1aa5d34..4bbb391 100644
--- a/ui-commit.c
+++ b/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);