\documentclass[a4paper,12pt,oneside,dutch]{isodoc}

% rubber: clean <%= invoice_id %>.out

\usepackage{array}
\setupdocument{
  % Language and style,
  dutch,
  fill,
  fontpackage=pxfonts,
  % Company info.
  company=,
  who=Foo Bedrijf,
  street=Zomaareenstraat 123,
  city=Ergens,
  zip=1234~ZZ,
  country=The Netherlands,
  countrycode=NL,
  logoaddress={\hspace{-4.4em}
               \begin{tabular}{l@{\ }l}
                \addresstext:   & \who\\
                                & \street\\
                                & \zip\ \city\\[.2em]
                \cellphonetext: & \lead\cellphone\\
                \emailtext:     & \email\\[.2em]
               \end{tabular}},
  % Footer.
  areacode=31,
  cellphone=6-12345678,
  email=info@foobedrijf.nl,
  % Addressee info.
  %foreign,
  to={<%= customer.name %>\\<%= customer.address_street%>\\
      <%= customer.address_postal_code %> <%= customer.address_city %>},
  % Headlines.
  date=<%= DateTime.now.to_formatted_s(:day_code) %>,
  ourref=<%= invoice_id %>,
  subject=Factuur <%= month.to_formatted_s(:month_and_year) %>,
  yourref=,
  % Payment data.
  term=30,
  accountno=12.34.567.890,
  accountname=Foo Bedrijf,
}
\newcommand{\addresstext}{adres}
\renewcommand{\chambertext}{KvK-nr}
\renewcommand{\datetext}{Factuurdatum}
\renewcommand{\emailtext}{e-mail}
\renewcommand{\invoicetext}{\Large\textbf{Factuur}}
\renewcommand{\ourreftext}{Factuurnummer}
\renewcommand{\referencetext}{factuurnummer}
\renewcommand{\vatnotext}{btw-nr}
\renewcommand{\websitetext}{website}

\newenvironment{ihtable}%
 %{\vskip1em\tabularx{\linewidth}{@{}X@{\ \barsep\quad}|r@{\ \barsep\quad}r@{\ \barsep\quad}r@{}}
 {\vskip1em\tabularx{\linewidth}{@{}X|@{\quad}r|@{\quad}r|@{\quad}r@{}}
   \descriptiontext&Aantal uur&Uurtarief&\amounttext\ML}%
 {\endtabularx}
\newcommand{\ihitem}[4]{#1&#2&\currency~#3&\currency~#4\\}
\newcommand{\ihsubtotal}[1]{\cmidrule[.0em]{4-4}%
  \textit{Subtotaal}&&&\currency~#1\\}
\newcommand{\inosubtotal}{&&&\\}
\newcommand{\ihvat}[1]{\textit{Btw-heffing 19\%}&&&\currency~#1\\}
\newcommand{\ihtotal}[1]{\cmidrule[.05em]{4-4}%
  \textbf{\Totaltext}&&&\textbf{\currency~#1}}

\begin{document}

\invoice{
 \hypersetup{pdftitle=\invoicetext\ naar\ \toname\ gedateerd \date\ (\ourref)}

 \begin{ihtable}
  <% total = 0.0 %>
  <% tasks.each do |task, line| %>
  \ihitem{<%= task.name %>}{<% "%.2f" % line[0] %>}%
         {<%= "%.2f" % line[1] %>}{<%= "%.2f" % line[2] %>}
  <% total += line[2] %>
  <% end %>
  %\ihsubtotal{...}
  \inosubtotal
  %\ihvat{...}
  \ihtotal{<%= "%.2f" % total %>}
 \end{ihtable}
 \vspace{2em}

 Ik verzoek u vriendelijk het verschuldigde bedrag binnen 30 dagen na
 factuurdatum over te maken onder vermelding van het factuurnummer. \\

 \accountdata
}

\end{document}