Created
August 16, 2019 03:25
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Utility to run pdflatex
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| import os | |
| import io | |
| import tempfile | |
| import subprocess | |
| import logging | |
| import zipfile | |
| from contextlib import contextmanager | |
| logger = logging.getLogger(__name__) | |
| @contextmanager | |
| def _setenv(**mapping): | |
| """ | |
| ``with`` context to temporarily modify the environment variables | |
| Usage: | |
| def test_myapp_respects_this_envvar(): | |
| with _setenv(MYAPP_PLUGINS_DIR='testsandbox/plugins'): | |
| myapp.plugins.register() | |
| [...] | |
| """ | |
| backup = os.environ.copy() | |
| os.environ.update(mapping) | |
| try: | |
| yield | |
| finally: | |
| os.environ.clear() | |
| os.environ.update(backup) | |
| @contextmanager | |
| def _chdir(dirname): | |
| """ | |
| ``with`` context to temporarily chdir to a directory | |
| """ | |
| current = os.getcwd() | |
| os.chdir(dirname) | |
| try: | |
| yield | |
| finally: | |
| os.chdir(current) | |
| def make_pdf_from_zip(src_zip): | |
| """ | |
| Returns the bytes of the PDF | |
| """ | |
| with tempfile.TemporaryDirectory() as tmpdirname: | |
| zipfile.ZipFile(io.BytesIO(src_zip)).extractall(path=tmpdirname) | |
| with _setenv( | |
| PATH=(os.environ["PATH"] + ":/opt/texlive/2017/bin/x86_64-linux/"), | |
| HOME=tmpdirname, | |
| PERL5LIB=(os.environ.get("PERL5LIB", "") + ":/opt/texlive/2017/tlpkg/TeXLive/"), | |
| ): | |
| with _chdir(tmpdirname): | |
| # Run pdflatex... | |
| r = subprocess.run( | |
| [ | |
| "latexmk", | |
| "-verbose", | |
| "-interaction=batchmode", | |
| "-pdf", | |
| "-output-directory={}".format(tmpdirname), | |
| "document.tex", | |
| ], | |
| stdout=subprocess.PIPE, | |
| stderr=subprocess.STDOUT, | |
| ) | |
| stdout = r.stdout.decode("utf-8") | |
| logger.info(stdout) | |
| with open("document.pdf", "rb") as f: | |
| pdf = f.read() | |
| return pdf | |
| def make_pdf_from_tex(tex): | |
| """ | |
| Make a PDF from contexts of a .tex file | |
| """ | |
| buf = io.BytesIO() | |
| with zipfile.ZipFile(buf, "w") as zipf: | |
| zipf.writestr("document.tex", tex) | |
| return make_pdf_from_zip(buf.getvalue()) |
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