pyltk/pyltk/documentclass.py

# -*- encoding: utf-8 -*-

from collections import Iterable
from .element import element

import enum
import os
import subprocess


class CompileResult(enum.Enum):

    ALREADY_EXISTS = 1
    SUCCESS = 2
    ERROR = 3


class documentclass(element):

    classname = 'standalone'

    templates = {
        'package': '\\usepackage{pkgoptions}{{{pkgname}}}',
        'options': '[{content}]',
        'def': '\\def\\{name}{nargs}{{{value}}}',
        'content': """\\documentclass{options}{{{classname}}}
{packages}
{preamble}
\\begin{{document}}
{content}
\\end{{document}}
"""
    }

    output_aux_folder = '.pyltk'
    auto_tex_folder_name = 'tex2pdf'

    def __init__(self, classname, childrens=[], options=[],
                 packages=[], preamble=[]):
        super().__init__(parent=None, childrens=childrens)
        self.options = options
        self.classname = classname
        self.packages = {}
        self.add_packages(packages)
        self.preamble = []
        self.add2preamble(preamble)

    def add_packages(self, packages):
        if type(packages) is str:
            self.packages[packages] = True
        elif type(packages) is dict:
            self.packages.update(packages)
        else:
            self.packages.update({p: True for p in packages})

    def add2preamble(self, value):
        if isinstance(value, Iterable):
            self.preamble.extend(value)
        else:
            self.preamble.append(value)

    def add_def(self, name, nargs, value):
        self.preamble.append(self.fmt().format('def', {
            'name': name,
            'nargs': '#{}'.format(nargs) if nargs > 0 else '',
            'value': value
        }))

    def format_preamble(self, defs):
        return '\n'.join(str(p) for p in self.preamble)

    def format_packages(self, pkgs):
        out = []
        for pkg in sorted(pkgs):
            options = ''
            if pkgs[pkg] is not True:
                options = self.format_options(pkgs[pkg])
            out.append(self.fmt().format('package', {
                'pkgname': pkg,
                'pkgoptions': options
            }))
        return '\n'.join(out)

    def content(self):
        return self.fmt().format('content', {
            'options': self.format_options(self.options),
            'packages': self.format_packages(self.packages),
            'preamble': self.format_preamble(self.preamble),
            'classname': self.classname,
            'content': super().content()
        })

    def compile(self, outfile, infile='auto', outlog=None,
                compile_twice=False):
        """ Compile the given document into a PDF file.

        If infile is not None, and infile already exists, the document
        will only be compiled if the content of infile is different
        from this document or if infile is newer than the output
        document.

        Parameters:
          - outfile Name of the output file (pdf extension may
            be omitted).
          - infile Name of the file to which latex code must be
            written. If None, a temporary file will be created
            and then erased. If 'auto', file will be saved in
            an automatic folder for future use.
          - outlog Output loging stream (default stdout).
          - compile_twice Set to true to compile the document twice.
        """

        outdir = os.path.dirname(outfile)
        outfile = os.path.basename(outfile)

        res = CompileResult.ERROR

        output_aux_folder = os.path.join(outdir, self.output_aux_folder)
        auto_tex_folder = os.path.join(output_aux_folder,
                                       self.auto_tex_folder_name)

        # Make aux directory
        os.makedirs(output_aux_folder, exist_ok=True)

        # Remove extension if exists
        if outfile.endswith('.pdf'):
            outfile = outfile[:-4]

        to_delete = False

        if infile == 'auto':
            os.makedirs(auto_tex_folder, exist_ok=True)
            infile = '{}/{}.tex'.format(auto_tex_folder, outfile)

        if infile is None:
            to_delete = True
            infile = os.path.join(outdir, '.pyltk-{}.tex'.format(outfile))

        to_create = True
        new_content = self.content()

        # If the input file already exists...
        if os.path.exists(infile):
            with open(infile, 'r') as infd:
                old_content = infd.read()

            # Content has not changed
            if old_content == new_content \
                and os.path.exists(os.path.join(outdir, outfile) + '.pdf') \
                and os.path.getctime(infile) <= \
                    os.path.getctime(os.path.join(outdir, outfile) + '.pdf'):
                to_create = False

        if to_create:
            with open(infile, 'w') as infd:
                infd.write(self.content())
            call = ['pdflatex', '-halt-on-error',
                    '-output-directory', output_aux_folder,
                    '-jobname', outfile, infile]
            res = subprocess.call(call, stdout=outlog)
            if compile_twice:
                res = subprocess.call(call, stdout=outlog)
            if res == 0:
                os.replace(
                    os.path.join(
                        output_aux_folder, outfile + '.pdf'),
                    os.path.join(outdir, outfile + '.pdf'))
                res = CompileResult.SUCCESS
            else:
                res = CompileResult.ERROR
        else:
            res = CompileResult.ALREADY_EXISTS

        if to_delete:
            os.remove(infile)

        return res