mailmerge PostScript jinja2 template

%!PS-Adobe-2.0
%%Creator: mailmerge.py
%%Title: invitation-envelope
%%Pages: 1
%%PageOrder: Ascend
%%BoundingBox: 0 0 612 792
%%DocumentPaperSizes: 155mm
%%EndComments

% Page size is 155mm square envelope
<<
    /PageSize [439 439]
>> setpagedevice

/Times-Roman findfont

dup length dict begin
{1 index /FID ne {def} {pop pop} ifelse} forall
/Encoding ISOLatin1Encoding def
currentdict
end
/EnvelopeLatin1 exch definefont pop

/EnvelopeLatin1 findfont
12 scalefont
setfont

newpath
{% set context = namespace(vpos=vstart|default(250)) %}
{% for line in lines %}
100 {{ context.vpos }} moveto
({{ line }}) show
{% set context.vpos = context.vpos - 20 %}
{% endfor %}
showpage
%%EOF