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https://git.lyx.org/repos/lyx.git
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376cb6763f
Remove support for python 1.x (really) This code has not been used for a long time, probably never, since some code above requires at least python 2.4 to work. I got to this code by running futurize from python-future. There are no significant warnings, mostly are related with the division but since we are dividing floats there is no change between python 2 and 3.
582 lines
22 KiB
Python
Executable File
582 lines
22 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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# file lyxpreview2bitmap.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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# author Angus Leeming
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# with much advice from members of the preview-latex project:
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# David Kastrup, dak@gnu.org and
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# Jan-Åke Larsson, jalar@mai.liu.se.
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# Full author contact details are available in file CREDITS
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# This script takes a LaTeX file and generates a collection of
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# png or ppm image files, one per previewed snippet.
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# Pre-requisites:
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# * python 2.4 or later (subprocess module);
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# * A latex executable;
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# * preview.sty;
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# * dvipng;
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# * dv2dt;
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# * pngtoppm (if outputing ppm format images).
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# preview.sty and dvipng are part of the preview-latex project
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# http://preview-latex.sourceforge.net/
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# preview.sty can alternatively be obtained from
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# CTAN/support/preview-latex/
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# Example usage:
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# lyxpreview2bitmap.py --bg=faf0e6 0lyxpreview.tex
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# This script takes one obligatory argument:
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#
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# <input file>: The name of the .tex file to be converted.
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#
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# and these optional arguments:
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#
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# --png, --ppm: The desired output format. Either 'png' or 'ppm'.
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# --dpi=<res>: A scale factor, used to ascertain the resolution of the
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# generated image which is then passed to gs.
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# --fg=<color>: The foreground color as a hexadecimal string, eg '000000'.
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# --bg=<color>: The background color as a hexadecimal string, eg 'faf0e6'.
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# --latex=<exe>: The converter for latex files. Default is latex.
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# --bibtex=<exe>: The converter for bibtex files. Default is bibtex.
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# --lilypond: Preprocess through lilypond-book. Default is false.
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# --lilypond-book=<exe>:
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# The converter for lytex files. Default is lilypond-book.
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#
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# -d, --debug Show the output from external commands.
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# -h, --help Show an help screen and exit.
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# -v, --verbose Show progress messages.
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# Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
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# if executed successfully, leave in DIR:
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# * a (possibly large) number of image files with names
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# like BASE[0-9]+.png
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# * a file BASE.metrics, containing info needed by LyX to position
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# the images correctly on the screen.
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# What does this script do?
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# 1) Call latex/pdflatex/xelatex/whatever (CONVERTER parameter)
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# 2) If the output is a PDF fallback to legacy
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# 3) Otherwise check each page of the DVI (with dv2dt) looking for
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# PostScript literals, not well supported by dvipng. Pages
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# containing them are passed to the legacy method in a new LaTeX file.
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# 4) Call dvipng on the pages without PS literals
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# 5) Join metrics info coming from both methods (legacy and dvipng)
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# and write them to file
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# dvipng is fast but gives problem in several cases, like with
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# PSTricks, TikZ and other packages using PostScript literals
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# for all these cases the legacy route is taken (step 3).
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# Moreover dvipng can't work with PDF files, so, if the CONVERTER
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# paramter is pdflatex we have to fallback to legacy route (step 2).
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from __future__ import print_function
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import getopt, glob, os, re, shutil, sys, tempfile
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from legacy_lyxpreview2ppm import extract_resolution, legacy_conversion_step1
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from lyxpreview_tools import bibtex_commands, check_latex_log, copyfileobj, \
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error, filter_pages, find_exe, find_exe_or_terminate, \
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join_metrics_and_rename, latex_commands, latex_file_re, make_texcolor, \
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pdflatex_commands, progress, run_command, run_latex, run_tex, \
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warning, write_metrics_info
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PY2 = sys.version_info[0] == 2
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def usage(prog_name):
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msg = """
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Usage: %s <options> <input file>
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Options:
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--dpi=<res>: Resolution per inch (default: 128)
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--png, --ppm: Select the output format (default: png)
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--fg=<color>: Foreground color (default: black, ie '000000')
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--bg=<color>: Background color (default: white, ie 'ffffff')
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--latex=<exe>: Specify the executable for latex (default: latex)
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--bibtex=<exe>: Specify the executable for bibtex (default: bibtex)
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--lilypond: Preprocess through lilypond-book (default: false)
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--lilypond-book=<exe>:
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The executable for lilypond-book (default: lilypond-book)
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-d, --debug: Show the output from external commands
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-h, --help: Show this help screen and exit
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-v, --verbose: Show progress messages
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The colors are hexadecimal strings, eg 'faf0e6'."""
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return msg % prog_name
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# Returns a list of tuples containing page number and ascent fraction
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# extracted from dvipng output.
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# Use write_metrics_info to create the .metrics file with this info
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def extract_metrics_info(dvipng_stdout):
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# "\[[0-9]+" can match two kinds of numbers: page numbers from dvipng
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# and glyph numbers from mktexpk. The glyph numbers always match
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# "\[[0-9]+\]" while the page number never is followed by "\]". Thus:
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page_re = re.compile("\[([0-9]+)[^]]");
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metrics_re = re.compile("depth=(-?[0-9]+) height=(-?[0-9]+)")
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success = 0
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page = ""
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pos = 0
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results = []
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while 1:
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match = page_re.search(dvipng_stdout, pos)
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if match == None:
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break
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page = match.group(1)
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pos = match.end()
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match = metrics_re.search(dvipng_stdout, pos)
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if match == None:
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break
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success = 1
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# Calculate the 'ascent fraction'.
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descent = float(match.group(1))
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ascent = float(match.group(2))
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frac = 0.5
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if ascent < 0:
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# This is an empty image, forbid its display
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frac = -1.0
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elif ascent >= 0 or descent >= 0:
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if abs(ascent + descent) > 0.1:
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frac = ascent / (ascent + descent)
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# Sanity check
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if frac < 0:
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frac = 0.5
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results.append((int(page), frac))
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pos = match.end() + 2
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if success == 0:
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error("Failed to extract metrics info from dvipng")
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return results
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def fix_latex_file(latex_file, pdf_output):
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# python 2 does not allow to declare a string as raw byte so we double
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# the backslashes and remove the r preffix
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def_re = re.compile(b"(\\\\newcommandx|\\\\global\\\\long\\\\def)"
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b"(\\\\[a-zA-Z]+)")
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tmp = tempfile.TemporaryFile()
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changed = False
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macros = []
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for line in open(latex_file, 'rb').readlines():
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if not pdf_output and line.startswith(b"\\documentclass"):
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changed = True
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line += b"\\PassOptionsToPackage{draft}{microtype}\n"
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else:
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match = def_re.match(line)
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if match != None:
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macroname = match.group(2)
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if macroname in macros:
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definecmd = match.group(1)
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if definecmd == b"\\newcommandx":
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changed = True
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line = line.replace(definecmd, b"\\renewcommandx")
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else:
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macros.append(macroname)
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tmp.write(line)
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if changed:
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copyfileobj(tmp, open(latex_file,"wb"), 1)
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return changed
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def convert_to_ppm_format(pngtopnm, basename):
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png_file_re = re.compile("\.png$")
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for png_file in glob.glob("%s*.png" % basename):
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ppm_file = png_file_re.sub(".ppm", png_file)
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p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
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p2p_status, p2p_stdout = run_command(p2p_cmd)
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if p2p_status:
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error("Unable to convert %s to ppm format" % png_file)
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ppm = open(ppm_file, 'w')
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ppm.write(p2p_stdout)
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os.remove(png_file)
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# Returns a tuple of:
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# ps_pages: list of page indexes of pages containing PS literals
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# pdf_pages: list of page indexes of pages requiring running pdflatex
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# page_count: total number of pages
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# pages_parameter: parameter for dvipng to exclude pages with PostScript/PDF
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def find_ps_pages(dvi_file):
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# latex failed
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# FIXME: try with pdflatex
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if not os.path.isfile(dvi_file):
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error("No DVI output.")
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# Check for PostScript specials in the dvi, badly supported by dvipng,
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# and inclusion of PDF/PNG/JPG files.
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# This is required for correct rendering of PSTricks and TikZ
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dv2dt = find_exe_or_terminate(["dv2dt"])
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dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
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# The output from dv2dt goes to stdout
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dv2dt_status, dv2dt_output = run_command(dv2dt_call)
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psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
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hyperref_re = re.compile("^special[1-4] [0-9]+ 'ps:.*/DEST pdfmark")
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pdffile_re = re.compile("^special[1-4] [0-9]+ 'PSfile=.*\\.(pdf|png|jpg|jpeg|PDF|PNG|JPG|JPEG)")
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# Parse the dtl file looking for PostScript specials and pdflatex files.
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# Pages using PostScript specials or pdflatex files are recorded in
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# ps_pages or pdf_pages, respectively, and then used to create a
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# different LaTeX file for processing in legacy mode.
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# If hyperref is detected, the corresponding page is recorded in pdf_pages.
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page_has_ps = False
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page_has_pdf = False
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page_index = 0
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ps_pages = []
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pdf_pages = []
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ps_or_pdf_pages = []
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for line in dv2dt_output.split("\n"):
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# New page
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if line.startswith("bop"):
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page_has_ps = False
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page_has_pdf = False
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page_index += 1
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# End of page
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if line.startswith("eop") and (page_has_ps or page_has_pdf):
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# We save in a list all the PostScript/PDF pages
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if page_has_ps:
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ps_pages.append(page_index)
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else:
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pdf_pages.append(page_index)
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ps_or_pdf_pages.append(page_index)
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if psliteral_re.match(line) != None:
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# Literal PostScript special detected!
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# If hyperref is detected, put this page on the pdf pages list
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if hyperref_re.match(line) != None:
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page_has_ps = False
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page_has_pdf = True
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else:
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page_has_ps = True
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elif pdffile_re.match(line) != None:
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# Inclusion of pdflatex image file detected!
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page_has_pdf = True
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# Create the -pp parameter for dvipng
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pages_parameter = ""
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if len(ps_or_pdf_pages) > 0 and len(ps_or_pdf_pages) < page_index:
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# Don't process Postscript/PDF pages with dvipng by selecting the
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# wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
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pages_parameter = " -pp "
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skip = True
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last = -1
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# Use page ranges, as a list of pages could exceed command line
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# maximum length (especially under Win32)
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for index in range(1, page_index + 1):
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if (not index in ps_or_pdf_pages) and skip:
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# We were skipping pages but current page shouldn't be skipped.
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# Add this page to -pp, it could stay alone or become the
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# start of a range.
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pages_parameter += str(index)
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# Save the starting index to avoid things such as "11-11"
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last = index
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# We're not skipping anymore
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skip = False
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elif (index in ps_or_pdf_pages) and (not skip):
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# We weren't skipping but current page should be skipped
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if last != index - 1:
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# If the start index of the range is the previous page
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# then it's not a range
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pages_parameter += "-" + str(index - 1)
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# Add a separator
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pages_parameter += ","
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# Now we're skipping
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skip = True
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# Remove the trailing separator
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pages_parameter = pages_parameter.rstrip(",")
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# We've to manage the case in which the last page is closing a range
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if (not index in ps_or_pdf_pages) and (not skip) and (last != index):
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pages_parameter += "-" + str(index)
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return (ps_pages, pdf_pages, page_index, pages_parameter)
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def main(argv):
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# Set defaults.
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dpi = 128
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fg_color = "000000"
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bg_color = "ffffff"
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bibtex = None
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latex = None
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lilypond = False
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lilypond_book = None
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output_format = "png"
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script_name = argv[0]
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# Parse and manipulate the command line arguments.
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try:
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(opts, args) = getopt.gnu_getopt(argv[1:], "dhv", ["bibtex=", "bg=",
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"debug", "dpi=", "fg=", "help", "latex=", "lilypond",
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"lilypond-book=", "png", "ppm", "verbose"])
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except getopt.GetoptError as err:
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error("%s\n%s" % (err, usage(script_name)))
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opts.reverse()
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for opt, val in opts:
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if opt in ("-h", "--help"):
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print(usage(script_name))
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sys.exit(0)
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elif opt == "--bibtex":
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bibtex = [val]
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elif opt == "--bg":
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bg_color = val
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elif opt in ("-d", "--debug"):
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import lyxpreview_tools
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lyxpreview_tools.debug = True
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elif opt == "--dpi":
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try:
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dpi = int(val)
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except:
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error("Cannot convert %s to an integer value" % val)
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elif opt == "--fg":
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fg_color = val
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elif opt == "--latex":
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latex = [val]
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elif opt == "--lilypond":
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lilypond = True
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elif opt == "--lilypond-book":
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lilypond_book = [val]
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elif opt in ("--png", "--ppm"):
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output_format = opt[2:]
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elif opt in ("-v", "--verbose"):
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import lyxpreview_tools
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lyxpreview_tools.verbose = True
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# Determine input file
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if len(args) != 1:
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err = "A single input file is required, %s given" % (len(args) or "none")
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error("%s\n%s" % (err, usage(script_name)))
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input_path = args[0]
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dir, latex_file = os.path.split(input_path)
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# Echo the settings
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progress("Starting %s..." % script_name)
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progress("Output format: %s" % output_format)
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progress("Foreground color: %s" % fg_color)
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progress("Background color: %s" % bg_color)
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progress("Resolution (dpi): %s" % dpi)
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progress("File to process: %s" % input_path)
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# Check for the input file
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if not os.path.exists(input_path):
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error('File "%s" not found.' % input_path)
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if len(dir) != 0:
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os.chdir(dir)
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# For python > 2 convert strings to bytes
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if not PY2:
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fg_color = bytes(fg_color, 'ascii')
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bg_color = bytes(bg_color, 'ascii')
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fg_color_dvipng = make_texcolor(fg_color, False)
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bg_color_dvipng = make_texcolor(bg_color, False)
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# External programs used by the script.
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latex = find_exe_or_terminate(latex or latex_commands)
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bibtex = find_exe(bibtex or bibtex_commands)
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if lilypond:
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lilypond_book = find_exe_or_terminate(lilypond_book or
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["lilypond-book --safe"])
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# These flavors of latex are known to produce pdf output
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pdf_output = latex in pdflatex_commands
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progress("Latex command: %s" % latex)
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progress("Latex produces pdf output: %s" % pdf_output)
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progress("Bibtex command: %s" % bibtex)
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progress("Lilypond-book command: %s" % lilypond_book)
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progress("Preprocess through lilypond-book: %s" % lilypond)
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progress("Altering the latex file for font size and colors")
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# Make sure that multiple defined macros and the microtype package
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# don't cause issues in the latex file.
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fix_latex_file(latex_file, pdf_output)
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if lilypond:
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progress("Preprocess the latex file through %s" % lilypond_book)
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if pdf_output:
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lilypond_book += " --pdf"
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lilypond_book += " --latex-program=%s" % latex.split()[0]
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# Make a copy of the latex file
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lytex_file = latex_file_re.sub(".lytex", latex_file)
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shutil.copyfile(latex_file, lytex_file)
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# Preprocess the latex file through lilypond-book.
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lytex_status, lytex_stdout = run_tex(lilypond_book, lytex_file)
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if pdf_output:
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progress("Using the legacy conversion method (PDF support)")
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return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
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bg_color, latex, pdf_output)
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# This can go once dvipng becomes widespread.
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dvipng = find_exe(["dvipng"])
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if dvipng == None:
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progress("Using the legacy conversion method (dvipng not found)")
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return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
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bg_color, latex, pdf_output)
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dv2dt = find_exe(["dv2dt"])
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if dv2dt == None:
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progress("Using the legacy conversion method (dv2dt not found)")
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return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
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bg_color, latex, pdf_output)
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pngtopnm = ""
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if output_format == "ppm":
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pngtopnm = find_exe(["pngtopnm"])
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if pngtopnm == None:
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progress("Using the legacy conversion method (pngtopnm not found)")
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return legacy_conversion_step1(latex_file, dpi, output_format,
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fg_color, bg_color, latex, pdf_output)
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# Compile the latex file.
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error_pages = []
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latex_status, latex_stdout = run_latex(latex, latex_file, bibtex)
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latex_log = latex_file_re.sub(".log", latex_file)
|
|
if latex_status:
|
|
progress("Will try to recover from %s failure" % latex)
|
|
error_pages = check_latex_log(latex_log)
|
|
|
|
# The dvi output file name
|
|
dvi_file = latex_file_re.sub(".dvi", latex_file)
|
|
|
|
# If there's no DVI output, look for PDF and go to legacy or fail
|
|
if not os.path.isfile(dvi_file):
|
|
# No DVI, is there a PDF?
|
|
pdf_file = latex_file_re.sub(".pdf", latex_file)
|
|
if os.path.isfile(pdf_file):
|
|
progress("%s produced a PDF output, fallback to legacy." \
|
|
% (os.path.basename(latex)))
|
|
progress("Using the legacy conversion method (PDF support)")
|
|
return legacy_conversion_step1(latex_file, dpi, output_format,
|
|
fg_color, bg_color, latex, True)
|
|
else:
|
|
error("No DVI or PDF output. %s failed." \
|
|
% (os.path.basename(latex)))
|
|
|
|
# Look for PS literals or inclusion of pdflatex files in DVI pages
|
|
# ps_pages: list of indexes of pages containing PS literals
|
|
# pdf_pages: list of indexes of pages requiring running pdflatex
|
|
# page_count: total number of pages
|
|
# pages_parameter: parameter for dvipng to exclude pages with PostScript
|
|
(ps_pages, pdf_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
|
|
|
|
# If all pages need PostScript or pdflatex, directly use the legacy method.
|
|
if len(ps_pages) == page_count:
|
|
progress("Using the legacy conversion method (PostScript support)")
|
|
return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
|
|
bg_color, latex, pdf_output)
|
|
elif len(pdf_pages) == page_count:
|
|
progress("Using the legacy conversion method (PDF support)")
|
|
return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
|
|
bg_color, "pdflatex", True)
|
|
|
|
# Retrieve resolution
|
|
resolution = extract_resolution(latex_log, dpi)
|
|
|
|
# Run the dvi file through dvipng.
|
|
dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
|
|
% (dvipng, resolution, fg_color_dvipng, bg_color_dvipng, pages_parameter, dvi_file)
|
|
dvipng_status, dvipng_stdout = run_command(dvipng_call)
|
|
|
|
if dvipng_status:
|
|
warning("%s failed to generate images from %s... fallback to legacy method" \
|
|
% (os.path.basename(dvipng), dvi_file))
|
|
progress("Using the legacy conversion method (dvipng failed)")
|
|
return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
|
|
bg_color, latex, pdf_output)
|
|
|
|
# Extract metrics info from dvipng_stdout.
|
|
metrics_file = latex_file_re.sub(".metrics", latex_file)
|
|
dvipng_metrics = extract_metrics_info(dvipng_stdout)
|
|
|
|
# If some pages require PostScript pass them to legacy method
|
|
if len(ps_pages) > 0:
|
|
# Create a new LaTeX file just for the snippets needing
|
|
# the legacy method
|
|
legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
|
|
filter_pages(latex_file, legacy_latex_file, ps_pages)
|
|
|
|
# Pass the new LaTeX file to the legacy method
|
|
progress("Pages %s include postscript specials" % ps_pages)
|
|
progress("Using the legacy conversion method (PostScript support)")
|
|
legacy_status, legacy_metrics = legacy_conversion_step1(legacy_latex_file,
|
|
dpi, output_format, fg_color, bg_color, latex, pdf_output, True)
|
|
|
|
# Now we need to mix metrics data from dvipng and the legacy method
|
|
original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
|
|
destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
|
|
|
|
# Join metrics from dvipng and legacy, and rename legacy bitmaps
|
|
join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
|
|
original_bitmap, destination_bitmap)
|
|
|
|
# If some pages require running pdflatex pass them to legacy method
|
|
if len(pdf_pages) > 0:
|
|
# Create a new LaTeX file just for the snippets needing
|
|
# the legacy method
|
|
legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
|
|
filter_pages(latex_file, legacy_latex_file, pdf_pages)
|
|
|
|
# Pass the new LaTeX file to the legacy method
|
|
progress("Pages %s require processing with pdflatex" % pdf_pages)
|
|
progress("Using the legacy conversion method (PDF support)")
|
|
legacy_status, legacy_metrics = legacy_conversion_step1(legacy_latex_file,
|
|
dpi, output_format, fg_color, bg_color, "pdflatex", True, True)
|
|
|
|
# Now we need to mix metrics data from dvipng and the legacy method
|
|
original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
|
|
destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
|
|
|
|
# Join metrics from dvipng and legacy, and rename legacy bitmaps
|
|
join_metrics_and_rename(dvipng_metrics, legacy_metrics, pdf_pages,
|
|
original_bitmap, destination_bitmap)
|
|
|
|
# Invalidate metrics for pages that produced errors
|
|
if len(error_pages) > 0:
|
|
error_count = 0
|
|
for index in error_pages:
|
|
if index not in ps_pages and index not in pdf_pages:
|
|
dvipng_metrics.pop(index - 1)
|
|
dvipng_metrics.insert(index - 1, (index, -1.0))
|
|
error_count += 1
|
|
if error_count:
|
|
warning("Failed to produce %d preview snippet(s)" % error_count)
|
|
|
|
# Convert images to ppm format if necessary.
|
|
if output_format == "ppm":
|
|
convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
|
|
|
|
# Actually create the .metrics file
|
|
write_metrics_info(dvipng_metrics, metrics_file)
|
|
|
|
return (0, dvipng_metrics)
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main(sys.argv)[0])
|