Jinja2 letter template example

letter_renderer.py

#!/usr/bin/env python
#encoding=utf-8
"""
Seth Brown
Python 3.2
Blog post link: http://j.mp/H5Zrdn
"""
import os, sys, csv
from glob import iglob
from subprocess import Popen, PIPE
import jinja2

def wrapper(*args):
    """CLI wrapper"""
    opts = [i for i in args]
    cmd = [] + opts
    process = Popen(cmd, stdout=PIPE)
    process.communicate()[0]
    return process

if __name__ == '__main__':
    # change the default delimiters used by Jinja
    # (prevent JinJa from interferring with LaTeX macros)
    letter_renderer = jinja2.Environment(
      block_start_string = '%{',
      block_end_string = '%}',
      variable_start_string = '%{{',
      variable_end_string = '%}}',
      loader = jinja2.FileSystemLoader(os.path.abspath('.')))

    template = letter_renderer.get_template('letter_template.tex')

    with open('addresses.txt') as infile:
        reader = csv.DictReader(infile, delimiter=":")
        os.mkdir("_letter_output")
        for n, address in enumerate(reader):
            output_dir = "_letter_output/"
            outfile =''.join((sys.argv[1], "-", str(n) + ".tex"))
            path = os.path.join(output_dir, outfile)
            with open(path, mode="w") as letter:
                letter.write(template.render(address = address))

    os.chdir(output_dir)
    [wrapper('/usr/texbin/xelatex', f) for f in iglob("*.tex")]
    pdf_util = '/System/Library/Automator/Combine PDF Pages.action/Contents/Resources/join.py'
    pdf_files = [p for p in iglob("*.pdf")]
    wrapper(pdf_util, '-o', 'merged_letters.pdf', *pdf_files) 

letter_template.tex

\today & Dear %{{ address.Name %}}, \\
& \\
\breakcell{%{{ address.Name %}} \\ %{{ address.A1 %}} \\ %{{ address.A2 %}}} &