first working version

.gitignore

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+
+# Created by https://www.gitignore.io/api/latex,python
+
+### LaTeX ###
+## Core latex/pdflatex auxiliary files:
+*.aux
+*.lof
+*.log
+*.lot
+*.fls
+*.out
+*.toc
+*.fmt
+*.fot
+*.cb
+*.cb2
+
+## Intermediate documents:
+*.dvi
+*.xdv
+*-converted-to.*
+
+*.pdf
+
+## Bibliography auxiliary files (bibtex/biblatex/biber):
+*.bbl
+*.bcf
+*.blg
+*-blx.aux
+*-blx.bib
+*.run.xml
+
+## Build tool auxiliary files:
+*.fdb_latexmk
+*.synctex
+*.synctex(busy)
+*.synctex.gz
+*.synctex.gz(busy)
+*.pdfsync
+*Notes.bib
+
+## Auxiliary and intermediate files from other packages:
+# algorithms
+*.alg
+*.loa
+
+# achemso
+acs-*.bib
+
+# amsthm
+*.thm
+
+# beamer
+*.nav
+*.pre
+*.snm
+*.vrb
+
+# changes
+*.soc
+
+# cprotect
+*.cpt
+
+# elsarticle (documentclass of Elsevier journals)
+*.spl
+
+# endnotes
+*.ent
+
+# fixme
+*.lox
+
+# feynmf/feynmp
+*.mf
+*.mp
+*.t[1-9]
+*.t[1-9][0-9]
+*.tfm
+
+#(r)(e)ledmac/(r)(e)ledpar
+*.end
+*.?end
+*.[1-9]
+*.[1-9][0-9]
+*.[1-9][0-9][0-9]
+*.[1-9]R
+*.[1-9][0-9]R
+*.[1-9][0-9][0-9]R
+*.eledsec[1-9]
+*.eledsec[1-9]R
+*.eledsec[1-9][0-9]
+*.eledsec[1-9][0-9]R
+*.eledsec[1-9][0-9][0-9]
+*.eledsec[1-9][0-9][0-9]R
+
+# glossaries
+*.acn
+*.acr
+*.glg
+*.glo
+*.gls
+*.glsdefs
+
+# gnuplottex
+*-gnuplottex-*
+
+# gregoriotex
+*.gaux
+*.gtex
+
+# hyperref
+*.brf
+
+# knitr
+*-concordance.tex
+# TODO Comment the next line if you want to keep your tikz graphics files
+*.tikz
+*-tikzDictionary
+
+# listings
+*.lol
+
+# makeidx
+*.idx
+*.ilg
+*.ind
+*.ist
+
+# minitoc
+*.maf
+*.mlf
+*.mlt
+*.mtc[0-9]*
+*.slf[0-9]*
+*.slt[0-9]*
+*.stc[0-9]*
+
+# minted
+_minted*
+*.pyg
+
+# morewrites
+*.mw
+
+# nomencl
+*.nlo
+
+# pax
+*.pax
+
+# pdfpcnotes
+*.pdfpc
+
+# sagetex
+*.sagetex.sage
+*.sagetex.py
+*.sagetex.scmd
+
+# scrwfile
+*.wrt
+
+# sympy
+*.sout
+*.sympy
+sympy-plots-for-*.tex/
+
+# pdfcomment
+*.upa
+*.upb
+
+# pythontex
+*.pytxcode
+pythontex-files-*/
+
+# thmtools
+*.loe
+
+# TikZ & PGF
+*.dpth
+*.md5
+*.auxlock
+
+# todonotes
+*.tdo
+
+# easy-todo
+*.lod
+
+# xindy
+*.xdy
+
+# xypic precompiled matrices
+*.xyc
+
+# endfloat
+*.ttt
+*.fff
+
+# Latexian
+TSWLatexianTemp*
+
+## Editors:
+# WinEdt
+*.bak
+*.sav
+
+# Texpad
+.texpadtmp
+
+# Kile
+*.backup
+
+# KBibTeX
+*~[0-9]*
+
+# auto folder when using emacs and auctex
+/auto/*
+
+# expex forward references with \gathertags
+*-tags.tex
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+.pytest_cache/
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule.*
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+
+output*
+*.yaml
+!*.example.yaml
+!strings.yaml
+.idea/

create.py

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+import os
+import subprocess
+
+import jinja2
+
+from utils import load_yaml, remove_tmp_files
+
+env = jinja2.Environment(
+    block_start_string='\BLOCK{',
+    block_end_string='}',
+    variable_start_string='\VAR{',
+    variable_end_string='}',
+    comment_start_string='\#{',
+    comment_end_string='}',
+    line_statement_prefix='%#',
+    line_comment_prefix='%%',
+    trim_blocks=True,
+    autoescape=False,
+    loader=jinja2.FileSystemLoader(os.path.abspath('.'))
+)
+
+DATA = {
+    "invoice_id": 1234,
+    "invoice_date": "01.03.2018"
+}
+
+DATA["from"] = load_yaml("from.yaml")
+DATA["to"] = load_yaml("recipents/{id}.yaml".format(id="innocraft"))
+
+# invoice = {
+#     "mode": "single",
+#     "description": "TESTOBJEKT",
+#     "timerange": "18.12.2016 - 28.02.2017",
+#     "price": 400,
+#     "locale": "de"
+# }
+invoice = {
+    "mode": "hourly",
+    "title": "Example Invoice",
+    "description": "Example",
+    "timerange": "18.12.2016 - 28.02.2017",
+    "hours": 35,
+    "per_hour": 21,
+    "locale": "en"
+}
+
+invoice["total"] = invoice["per_hour"] * invoice["hours"]
+
+DATA["invoice"] = invoice
+
+strings = load_yaml("strings.yaml")
+
+
+def translate(key):
+    if key in strings:
+        return strings[key][invoice["locale"]]
+    else:
+        print("Translation key for '{key}' is missing".format(key=key))
+        exit()
+
+
+def format_digit(integer):
+    string = "{0:.2f}".format(integer)
+    if invoice["locale"] == "de":
+        string = string.replace(".", ",")
+    return string
+
+
+env.filters['formatdigit'] = format_digit
+env.filters['t'] = translate
+with open("output.tex", "w") as fh:
+    template = env.get_template('template.tex')
+    fh.write(template.render(section1='Long Form', section2='Short Form', **DATA))
+subprocess.check_call(['pdflatex', 'output.tex'])
+remove_tmp_files("output")

strings.yaml

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+invoice:
+  de: Rechnung
+  en: Invoice
+descr:
+  de: Beschreibung
+  en: Description
+period:
+  de: Leistungszeitraum
+  en: Period
+total:
+  de: Gesamtpreis
+  en: Total
+per_hour:
+  de: Stundensatz
+  en: Hourly Rate
+hours:
+  de: Stunden
+  en: Hours
+taxexception:
+  de: Umsatzsteuerfrei aufgrund der Kleinunternehmerregelung gemäß §6(1)27 UStG
+  en: VAT-exempt because of small-business regulation (§6(1)27 UStG)
+transfer:
+  de: Ich bitte Sie, den Gesamtbetrag innerhalb der nächsten 10 Tage auf folgendes Konto zu überweisen
+  en: Please transfer the due invoice amount to the following account

template.tex

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+\documentclass[
+	a4paper,
+	12pt,
+	version=last,
+	fromalign=right,
+%	foldmarks=p, % keine mittlere Faltmarke
+	foldmarks=off,
+	enlargefirstpage,
+	fromemail,
+	fromphone,
+	fromcity,
+	fromlogo,
+	fromrule,
+	backaddress,
+]{scrlttr2}
+\usepackage[utf8]{inputenc}
+\BLOCK{if invoice.locale =="de"}
+\usepackage[ngerman]{babel}
+\BLOCK{else}
+\usepackage[english]{babel}
+\BLOCK{endif}
+\usepackage[T1]{fontenc}
+\usepackage{lmodern}
+\usepackage{mathpazo}
+\usepackage[left]{eurosym}
+\usepackage{booktabs}
+\usepackage{microtype}
+\usepackage{tabularx}
+
+\usepackage{color}
+\definecolor{LightGray}{rgb}{0.7,0.7,0.7}
+\definecolor{Gray}{rgb}{0.5,0.5,0.5}
+\setkomafont{fromrule}{\color{LightGray}}
+\setkomafont{fromaddress}{\sffamily} % Sans Serif
+\setkomafont{fromname}{\sffamily\bfseries} % and bold
+\setkomafont{pagefoot}{\sffamily\bfseries}
+
+\usepackage{graphicx}
+
+\newcommand{\separ}{~\textperiodcentered~}
+
+\hyphenpenalty=10000
+
+\newcommand{\VAR}[1]{\LaTeX} % Just a placeholder (will never be used)
+
+\newcommand{\BLOCK}[1]{\LaTeX} % Just a placeholder (will never be used)
+
+\newcommand{\Name}{\VAR{from.name}}
+\setkomavar{fromname}{\Name}
+\newcommand{\Address}{\VAR{from.address}}
+\newcommand{\ZIP}{\VAR{from.zip}}
+\newcommand{\City}{\VAR{from.city}}
+\newcommand{\CityShort}{\VAR{from.cityShort}}
+
+\setkomavar{fromaddress}{\Address\\\ZIP~\City
+    \BLOCK{if to.country!="Austria"}\\\VAR{from.country}\BLOCK{endif}}
+\setkomavar{fromphone}[]{\VAR{from.phone}}
+\setkomavar{fromemail}[]{\VAR{from.email}}
+\setkomavar{fromurl}[]{\VAR{from.url}}
+%\setkomavar{fromlogo}{\includegraphics[height=3.2cm]{template/header.jpg}}
+
+
+\setkomavar{frombank}{Sparkasse Krems\separ IBAN: \VAR{from.IBAN}\separ BIC: \VAR{from.BIC}}
+%TODO: Linie über
+\setkomavar{firstfoot}{\centering\color{Gray}\scriptsize\Name\separ\Address\separ\ZIP~\City\\
+\usekomavar{fromphone}\separ\usekomavar{fromemail}\separ\usekomavar{fromurl}\\\usekomavar{frombank}}
+
+\setkomavar{invoice}{\VAR{invoice_id}}
+\setkomavar{date}{\VAR{invoice_date}}
+
+\pdfinfo{
+   /Author (\Name)
+   /Title  (\VAR{"invoice" |t} \VAR{from.name} (\VAR{rechnungsDatum}))
+   /Subject (\VAR{"invoice" |t} \VAR{from.name} (\VAR{rechnungsDatum}))
+   /Keywords (\VAR{"invoice" |t})
+}
+
+\setkomavar{backaddress}{\usekomavar{fromname}, \Address, \ZIP~\CityShort}
+
+% Begin document
+\begin{document}
+\begin{letter}{\VAR{to.name} \\ \VAR{to.address} \\ \VAR{to.plz}~\VAR{to.ort}
+		\BLOCK{if to.country!="Austria"}\\\VAR{to.country}\BLOCK{endif}}
+\setkomavar{title}{\VAR{invoice.title}}
+\opening{}
+
+\BLOCK{if invoice.mode=="single"}
+\begin{tabular}{ll}
+	\VAR{"descr"|t}:& \VAR{invoice.description} \\
+	\VAR{"period"|t}: & \VAR{invoice.timerange} \\
+	\VAR{"total"|t}: & \EUR{\VAR{invoice.price | formatdigit }} \\
+	
+	\vspace{0.5cm}
+	
+\end{tabular}
+\BLOCK{elif invoice.mode=="hourly"}
+
+\vspace{0.5cm}
+\begin{tabularx}{\textwidth}{Xrrr}
+	\VAR{"descr"|t} & \VAR{"per_hour"|t} & \VAR{"hours"|t} & \VAR{"total"|t} \\ \midrule
+	
+	\VAR{invoice.description} &
+	\EUR{\VAR{invoice.per_hour | formatdigit }} &
+	\VAR{invoice.hours} &
+	\EUR{\VAR{invoice.total | formatdigit }} \\
+	
+	
+	
+	\midrule %\cmidrule{4-4}
+
+	
+	& & & \EUR{\VAR{invoice.total | formatdigit }} \\
+\end{tabularx}
+
+\BLOCK{endif}
+
+\vspace{0.5cm}
+\noindent \VAR{"taxexception"|t}
+
+\vspace{0.5cm}
+\noindent \VAR{"transfer"|t}:
+
+\vspace{0.5cm}
+
+\begin{tabular}{@{}ll}
+	Bank: &\VAR{from.bank}\\
+	IBAN:& \VAR{from.IBAN}\\
+	BIC:& \VAR{from.BIC}
+\end{tabular}
+
+
+\end{letter}
+\end{document}

utils.py

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+import os
+
+import yaml
+
+
+def load_yaml(filename):
+    with open(filename, 'r') as stream:
+        return yaml.load(stream)
+
+
+def remove_tmp_files(base):
+    for ext in ["aux", "log"]:
+        os.remove(base + "." + ext)