[%- sha1 = sha1 || HEAD -%]
<span class='chroma-hash'>[%-
    hptr = 0;
    WHILE hptr < sha1.length - 6;
      sha1part = sha1.substr(hptr, 6);
      "<span style='border-bottom: solid 4px #" _ sha1part _ ";'>" _ sha1part _ "</span>";
      hptr = hptr + 6;
    END;
-%]</span>