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184 lines
8.0 KiB
Python
184 lines
8.0 KiB
Python
# file docbook_copy.py
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# This file is part of LyX, the document processor.
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# Licence details can be found in the file COPYING.
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#
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# \author Thibaut Cuvelier
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#
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# Full author contact details are available in file CREDITS
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# Usage:
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# python docbook_copy.py lilypond_book_command in.docbook out.docbook
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# This script copies the original DocBook file (directly produced by LyX) to the output DocBook file,
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# potentially applying a post-processing step. For now, the only implemented post-processing step is
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# LilyPond.
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# lilypond_book_command is either directly the binary to call OR the equivalent Python script that is
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# not directly executable.
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# /!\ The original file may be modified by this script!
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import subprocess
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import os
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import os.path
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import re
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import shutil
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import sys
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class DocBookCopier:
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def __init__(self, args):
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# Parse the command line.
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self.lilypond_command = args[1]
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self.in_file = args[2]
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self.out_file = args[3]
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# Compute a few things from the raw parameters.
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self.in_folder = os.path.split(self.in_file)[0]
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self.out_folder = os.path.split(self.out_file)[0]
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self.in_lily_file = self.in_file.replace('.xml', '.lyxml')
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self.has_lilypond = self.lilypond_command not in {'', 'none'}
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self.lilypond_folder = os.path.split(self.lilypond_command)[0] if self.has_lilypond else ''
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self.do_lilypond_processing = self.has_lilypond and self.in_file_needs_lilypond()
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# Help debugging.
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print('>> Given arguments:')
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print('>> LilyPond: ' + ('present' if self.has_lilypond else 'not found') + '.')
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print('>> LilyPond callable as: ' + self.lilypond_command + '.')
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print('>> LilyPond path: ' + self.lilypond_folder + '.')
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print('>> Input file: ' + self.in_file + '.')
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print('>> Output file: ' + self.out_file + '.')
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print('>> Input folder: ' + self.in_folder + '.')
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print('>> Output folder: ' + self.out_folder + '.')
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def in_file_needs_lilypond(self):
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# Really tailored to the kind of output lilypond.module makes (in lib/layouts).
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with open(self.in_file) as f:
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return "language='lilypond'" in f.read()
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def preprocess_input_for_lilypond(self):
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# LilyPond requires that its input file has the .lyxml extension. Due to a bug in LilyPond,
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# use " instead of ' to encode XML attributes.
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# Bug report: https://gitlab.com/lilypond/lilypond/-/issues/6185
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# Typical transformation:
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# Fixed by 2.23.4.
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# FROM: language='lilypond' role='fragment verbatim staffsize=16 ragged-right relative=2'
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# TO: language="lilypond" role="fragment verbatim staffsize=16 ragged-right relative=2"
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# Another problem to fix: the output is in XML, with some characters encoded as XML
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# entities. For instance, this could be in a LilyPond snippet:
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# \new PianoStaff <<
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# instead of:
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# \new PianoStaff <<
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# (More complete example:
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# https://lilypond.org/doc/v2.23/Documentation/learning/piano-centered-lyrics.)
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# This issue must be fixed by LilyPond, as any change in this part would make the XML
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# file invalid.
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# Bug report: https://gitlab.com/lilypond/lilypond/-/issues/6204
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with open(self.in_file, encoding='utf-8') as f, open(self.in_lily_file, 'w', encoding='utf-8') as f_lily:
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for line in f:
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if "language='lilypond'" in line:
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line = re.sub(
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'<programlisting\\s+language=\'lilypond\'.*?(role=\'(?P<options>.*?)\')?>',
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'<programlisting language="lilypond" role="\\g<options>">',
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line
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)
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f_lily.write(line)
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os.unlink(self.in_file)
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def postprocess_output_for_lilypond(self):
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# Major problem: LilyPond used to output the LilyPond code outside the image, which is then always displayed
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# before the image (instead of only the generated image).
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# Bug report: https://gitlab.com/lilypond/lilypond/-/issues/6186
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# No more necessary with the new version of LilyPond (2.23.4). No efficient way to decide how to post-process
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# for previous versions of LilyPond. Basically, it does not make sense to post-process.
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pass
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def call_lilypond(self):
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# LilyPond requires that its input file has the .lyxml extension (plus bugs in LilyPond).
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print('>> Rewriting ' + self.in_file)
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print('>> as ' + self.in_lily_file + '.')
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self.preprocess_input_for_lilypond()
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# Add LilyPond to the PATH. lilypond-book uses a direct call to lilypond from the PATH.
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if os.path.isdir(self.lilypond_folder):
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os.environ['PATH'] += os.pathsep + self.lilypond_folder
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# Make LilyPond believe it is working from the temporary LyX directory. Otherwise, it tries to find files
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# starting from LyX's working directory... LilyPond bug, most likely.
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# https://lists.gnu.org/archive/html/bug-lilypond/2021-09/msg00041.html
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os.chdir(self.in_folder)
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# Start LilyPond on the copied file. First test the binary, then check if adding Python helps.
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command_args = ['--format=docbook', '--output=' + self.in_folder, self.in_lily_file]
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command_raw = [self.lilypond_command] + command_args
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command_python = ['python', self.lilypond_command] + command_args
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print('>> Running LilyPond.')
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sys.stdout.flush() # So that the LilyPond output is at the right place in the logs.
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failed = True
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exceptions = []
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for cmd in [command_raw, command_python]:
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try:
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subprocess.check_call(cmd, stdout=sys.stdout.fileno(), stderr=sys.stdout.fileno())
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print('>> Success running LilyPond with ')
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print('>> ' + str(cmd))
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failed = False
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except (subprocess.CalledProcessError, OSError) as e:
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exceptions.append((cmd, e))
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if failed:
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print('>> Error from LilyPond. The successive calls were:')
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for (i, pair) in enumerate(exceptions):
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exc = pair[0]
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cmd = pair[1]
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print('>> (' + i + ') Error from trying ' + str(cmd) + ':')
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print('>> (' + i + ') ' + str(exc))
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if failed:
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sys.exit(1)
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# LilyPond has a distressing tendency to leave the raw LilyPond code in the new file.
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self.postprocess_output_for_lilypond()
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# Now, in_file should have the clean LilyPond-processed contents.
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def copy_lilypond_generated_images(self):
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# LilyPond generates a lot of files in LyX' temporary folder, within the ff folder: source LilyPond files
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# for each snippet to render, images in several formats.
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in_generated_images_folder = os.path.join(self.in_folder, 'ff')
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out_generated_images_folder = os.path.join(self.out_folder, 'ff')
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if not os.path.isdir(out_generated_images_folder):
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os.mkdir(out_generated_images_folder)
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for img in os.listdir(in_generated_images_folder):
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if not img.endswith('.png') and not img.endswith('.pdf'):
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continue
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shutil.copyfile(
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os.path.join(in_generated_images_folder, img),
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os.path.join(out_generated_images_folder, img),
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)
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def copy(self):
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# Apply LilyPond to the original file if available and needed.
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if self.do_lilypond_processing:
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print('>> The input file needs a LilyPond pass and LilyPond is available.')
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self.call_lilypond()
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# Perform the actual copy: both the modified XML file and the generated images, if LilyPond is used.
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shutil.copyfile(self.in_file, self.out_file)
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if self.do_lilypond_processing:
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self.copy_lilypond_generated_images()
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if __name__ == '__main__':
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if len(sys.argv) != 4:
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print(f'Exactly four arguments are expected, only {len(sys.argv)} found: {sys.argv}.')
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sys.exit(1)
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DocBookCopier(sys.argv).copy()
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