How to use the changelog.changelog_html function in changelog

_run([sys.executable, mozupdate, "-q", "partial"] +
                     mozupdate_clobber_arg +
                     ["--removed-files-candidates", removed_file_list,
                      "--force", pkg_path, ref_mar_dir, image_dir])
                print "created '%s' (for 'nightly' channel)" % pkg_path
            except OSError, ex:
                log.warn("'nightly' mar failed: %r", ex)
                print "failed to create mar for 'nightly' channel - ignoring"
        built_at_least_one_nightly_update = True

        # ...and a changelog for this.
        changelog_path = join(packagesDir,
            "%s-partial-%s.html" % (cfg.komodoPackageBase, ref_mar_ver))
        start_rev = guru.changenum_from_mar_path(ref_mar_path) + 1
        end_rev = guru.changenum_from_mar_path(pkg_path)
        html = changelog.changelog_html(start_rev, end_rev)
        if not dryRun:
            open(changelog_path, 'w').write(html.encode('utf-8', 'ignore'))
        print "created '%s'" % changelog_path
    if not built_at_least_one_nightly_update:
        log.warn("no previous nightly complete .mar exists: skipping "
                 "build of partial update package for *nightly* channel")
    
    # - For betas *and* finals, want a partial update relative to the last
    #   released package, beta or not (for beta channel). Note: alphas
    #   count as a "beta" here, i.e. "beta" == "pre-release".
    ref_mar_path = last_beta_release_complete_mar \
        = guru.last_release_complete_mar
    if ref_mar_path is None:
        log.warn("no preceding release complete .mar package: skipping "
                 "build of partial update package for *beta* channel")
    elif not buildutils.remote_exists(ref_mar_path):