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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2019 Marc Jeanmougin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
#
"""
Generate Latex via a PDF using pdflatex
"""
import os
import inkex
from inkex.base import TempDirMixin
from inkex.command import ProgramRunError, call, inkscape
from inkex import load_svg, ShapeElement, Defs
from inkex.units import convert_unit
from inkex.localization import inkex_gettext as _
class PdfLatex(TempDirMixin, inkex.GenerateExtension):
"""
Use pdflatex to generate LaTeX, this whole hack is required because
we don't want to open a LaTeX document as a document, but as a
generated fragment (like import, but done manually).
"""
def add_arguments(self, pars):
pars.add_argument(
"--formule",
type=str,
default=r"\(\displaystyle\frac{\pi^2}{6}=\lim_{n \to \infty}\sum_{k=1}^n \frac{1}{k^2}\)",
)
pars.add_argument(
"--preamble",
type=str,
default="".join(
f"\\usepackage{{ams{i}}}" for i in ["math", "symb", "fonts"]
),
)
pars.add_argument("--font_size", type=int, default=10)
pars.add_argument("--page", choices=["basic", "advanced"])
pars.add_argument("--standalone", type=inkex.Boolean, default=True)
def generate(self):
tex_file = os.path.join(self.tempdir, "input.tex")
pdf_file = os.path.join(self.tempdir, "input.pdf") # Auto-generate by pdflatex
svg_file = os.path.join(self.tempdir, "output.svg")
with open(tex_file, "w") as fhl:
self.write_latex(fhl)
try:
call(
"pdflatex",
tex_file,
output_directory=self.tempdir,
halt_on_error=True,
oldie=True,
)
except ProgramRunError as err:
inkex.errormsg(_("An exception occurred during LaTeX compilation: ") + "\n")
inkex.errormsg(err.stdout.decode("utf8").replace("\r\n", "\n"))
raise inkex.AbortExtension()
inkscape(
pdf_file,
export_filename=svg_file,
pdf_page=1,
pdf_poppler=True,
export_type="svg",
actions=(
"select-all;page-fit-to-selection;"
"clone-unlink-recursively;vacuum-defs"
),
)
if not os.path.isfile(svg_file):
fn = os.path.basename(svg_file)
if os.path.isfile(fn):
# Inkscape bug detected, file got saved wrong
svg_file = fn
with open(svg_file, "r") as fhl:
svg: inkex.SvgDocumentElement = load_svg(fhl).getroot()
scale = convert_unit("1pt", "px") / self.svg.scale
if not self.options.standalone:
scale *= self.options.font_size / 10
for child in svg:
if isinstance(child, ShapeElement):
child.transform = inkex.Transform(scale=scale) @ child.transform
yield child
elif isinstance(child, Defs):
for def_child in child:
# The ids of both the imported and the target document should
# be off-limits
def_child.set_random_ids(
backlinks=True, blacklist=self.svg.get_ids()
)
self.svg.defs.append(def_child)
def write_latex(self, stream):
"""Takes a formula and wraps it in latex"""
if self.options.standalone:
docclass = (
f"\\documentclass[fontsize={self.options.font_size}pt, "
+ "class=scrreprt, preview]{standalone}"
)
else:
docclass = r"\documentclass{minimal}"
stream.write(
f"""%% processed with pdflatex.py
{docclass}
{self.options.preamble}
\\begin{{document}}
{self.options.formule}
\\end{{document}}
"""
)
stream.flush()
if __name__ == "__main__":
PdfLatex().run()
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