mirror of
https://git.lyx.org/repos/lyx.git
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f9de88c53c
Fedora ships these chmod 644 and has never seen a problem. The advantage to doing this is that it better controls what version of python we are using to launch the script, and it will reveal if we're somehow somewhere not controlling that properly.
459 lines
16 KiB
Python
459 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# file legacy_lyxpreview2ppm.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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# Full author contact details are available in file CREDITS
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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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# and with much help testing the code under Windows from
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# Paul A. Rubin, rubin@msu.edu.
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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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# Example usage:
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# legacy_lyxpreview2bitmap.py 0lyxpreview.tex 128 ppm 000000 faf0e6
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# This script takes five arguments:
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# TEXFILE: the name of the .tex file to be converted.
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# SCALEFACTOR: 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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# OUTPUTFORMAT: the format of the output bitmap image files.
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# This particular script can produce only "ppm" format output.
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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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# 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]+.(ppm|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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# The script uses several external programs and files:
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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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# * dvips;
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# * gs;
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# * pdflatex (optional);
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# * pnmcrop (optional).
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# preview.sty is part of the preview-latex project
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# http://preview-latex.sourceforge.net/
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# Alternatively, it can be obtained from
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# CTAN/support/preview-latex/
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# What does this script do?
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# [legacy_conversion]
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# 0) Process command-line arguments
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# [legacy_conversion_step1]
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# 1) Call latex to create a DVI file from LaTeX
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# [legacy_conversion_step2]
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# 2) Call dvips to create one PS file for each DVI page
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# [legacy_conversion_step3]
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# 3) If dvips fails look for PDF and call gs to produce bitmaps
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# 4) Otherwise call gs on each PostScript file to produce bitmaps
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# [legacy_conversion_pdflatex]
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# 5) Keep track of pages on which gs failed and pass them to pdflatex
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# 6) Call gs on the PDF output from pdflatex to produce bitmaps
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# 7) Extract and write to file (or return to lyxpreview2bitmap)
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# metrics from both methods (standard and pdflatex)
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# The script uses the old dvi->ps->png conversion route,
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# which is good when using PSTricks, TikZ or other packages involving
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# PostScript literals (steps 1, 2, 4).
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# This script also generates bitmaps from PDF created by a call to
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# lyxpreview2bitmap.py passing "pdflatex" to the CONVERTER parameter
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# (step 3).
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# Finally, there's also has a fallback method based on pdflatex, which
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# is required in certain cases, if hyperref is active for instance,
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# (step 5, 6).
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# If possible, dvipng should be used, as it's much faster.
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import glob, os, pipes, re, string, sys
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from lyxpreview_tools import copyfileobj, error, filter_pages, find_exe, \
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find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
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latex_file_re, make_texcolor, mkstemp, pdflatex_commands, progress, \
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run_command, run_latex, warning, write_metrics_info
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def usage(prog_name):
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return "Usage: %s <latex file> <dpi> ppm <fg color> <bg color>\n" \
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"\twhere the colors are hexadecimal strings, eg 'faf0e6'" \
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% 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 legacy_extract_metrics_info(log_file):
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log_re = re.compile("Preview: ([ST])")
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data_re = re.compile("(-?[0-9]+) (-?[0-9]+) (-?[0-9]+) (-?[0-9]+)")
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tp_ascent = 0.0
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tp_descent = 0.0
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success = 0
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results = []
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try:
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for line in open(log_file, 'r').readlines():
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match = log_re.match(line)
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if match == None:
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continue
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snippet = (match.group(1) == 'S')
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success = 1
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match = data_re.search(line)
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if match == None:
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error("Unexpected data in %s\n%s" % (log_file, line))
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if snippet:
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ascent = string.atoi(match.group(2))
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descent = string.atoi(match.group(3))
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frac = 0.5
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if ascent >= 0 and descent >= 0:
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ascent = float(ascent) + tp_ascent
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descent = float(descent) - tp_descent
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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 or frac > 1:
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frac = 0.5
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results.append((int(match.group(1)), frac))
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else:
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tp_descent = string.atof(match.group(2))
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tp_ascent = string.atof(match.group(4))
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except:
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# Unable to open the file, but do nothing here because
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# the calling function will act on the value of 'success'.
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warning('Warning in legacy_extract_metrics_info! Unable to open "%s"' % log_file)
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warning(`sys.exc_type` + ',' + `sys.exc_value`)
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if success == 0:
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error("Failed to extract metrics info from %s" % log_file)
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return results
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def extract_resolution(log_file, dpi):
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fontsize_re = re.compile("Preview: Fontsize")
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magnification_re = re.compile("Preview: Magnification")
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extract_decimal_re = re.compile("([0-9\.]+)")
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extract_integer_re = re.compile("([0-9]+)")
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found_fontsize = 0
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found_magnification = 0
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# Default values
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magnification = 1000.0
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fontsize = 10.0
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try:
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for line in open(log_file, 'r').readlines():
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if found_fontsize and found_magnification:
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break
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if not found_fontsize:
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match = fontsize_re.match(line)
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if match != None:
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match = extract_decimal_re.search(line)
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if match == None:
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error("Unable to parse: %s" % line)
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fontsize = string.atof(match.group(1))
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found_fontsize = 1
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continue
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if not found_magnification:
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match = magnification_re.match(line)
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if match != None:
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match = extract_integer_re.search(line)
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if match == None:
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error("Unable to parse: %s" % line)
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magnification = string.atof(match.group(1))
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found_magnification = 1
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continue
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except:
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warning('Warning in extract_resolution! Unable to open "%s"' % log_file)
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warning(`sys.exc_type` + ',' + `sys.exc_value`)
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# This is safe because both fontsize and magnification have
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# non-zero default values.
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return dpi * (10.0 / fontsize) * (1000.0 / magnification)
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def legacy_latex_file(latex_file, fg_color, bg_color):
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use_preview_re = re.compile(r"\s*\\usepackage\[([^]]+)\]{preview}")
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fg_color_gr = make_texcolor(fg_color, True)
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bg_color_gr = make_texcolor(bg_color, True)
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tmp = mkstemp()
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success = 0
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try:
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f = open(latex_file, 'r')
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except:
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# Unable to open the file, but do nothing here because
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# the calling function will act on the value of 'success'.
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warning('Warning in legacy_latex_file! Unable to open "%s"' % latex_file)
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warning(`sys.exc_type` + ',' + `sys.exc_value`)
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for line in f.readlines():
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if success:
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tmp.write(line)
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continue
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match = use_preview_re.match(line)
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if match == None:
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tmp.write(line)
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continue
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success = 1
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# Package order: color should be loaded before preview
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# Preview options: add the options lyx and tightpage
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tmp.write(r"""
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\usepackage{color}
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\definecolor{fg}{rgb}{%s}
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\definecolor{bg}{rgb}{%s}
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\pagecolor{bg}
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\usepackage[%s,lyx,tightpage]{preview}
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\makeatletter
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\g@addto@macro\preview{\begingroup\color{bg}\special{ps::clippath fill}\color{fg}}
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\g@addto@macro\endpreview{\endgroup}
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\makeatother
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""" % (fg_color_gr, bg_color_gr, match.group(1)))
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if success:
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copyfileobj(tmp, open(latex_file,"wb"), 1)
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return success
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def crop_files(pnmcrop, basename):
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t = pipes.Template()
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t.append('%s -left' % pnmcrop, '--')
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t.append('%s -right' % pnmcrop, '--')
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for file in glob.glob("%s*.ppm" % basename):
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tmp = mkstemp()
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new = t.open(file, "r")
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copyfileobj(new, tmp)
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if not new.close():
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copyfileobj(tmp, open(file,"wb"), 1)
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def legacy_conversion(argv, skipMetrics = False):
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# Parse and manipulate the command line arguments.
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if len(argv) == 7:
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latex = [argv[6]]
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elif len(argv) != 6:
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error(usage(argv[0]))
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else:
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latex = None
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dir, latex_file = os.path.split(argv[1])
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if len(dir) != 0:
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os.chdir(dir)
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dpi = string.atoi(argv[2])
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output_format = argv[3]
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fg_color = argv[4]
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bg_color = argv[5]
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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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pdf_output = latex in pdflatex_commands
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return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
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bg_color, latex, pdf_output, skipMetrics)
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# Add color info to the latex file, since ghostscript doesn't
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# have the option to set foreground and background colors on
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# the command line. Run the resulting file through latex.
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def legacy_conversion_step1(latex_file, dpi, output_format, fg_color, bg_color,
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latex, pdf_output = False, skipMetrics = False):
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# Move color information, lyx and tightpage options into the latex file.
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if not legacy_latex_file(latex_file, fg_color, bg_color):
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error("""Unable to move the color information, and the lyx and tightpage
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options of preview-latex, into the latex file""")
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# Compile the latex file.
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latex_status, latex_stdout = run_latex(latex, latex_file)
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if pdf_output:
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return legacy_conversion_step3(latex_file, dpi, output_format, True, skipMetrics)
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else:
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return legacy_conversion_step2(latex_file, dpi, output_format, skipMetrics)
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# Creates a new LaTeX file from the original with pages specified in
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# failed_pages, pass it through pdflatex and updates the metrics
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# from the standard legacy route
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def legacy_conversion_pdflatex(latex_file, failed_pages, legacy_metrics, gs,
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gs_device, gs_ext, alpha, resolution, output_format):
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# Search for pdflatex executable
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pdflatex = find_exe(["pdflatex"])
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if pdflatex == None:
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warning("Can't find pdflatex. Some pages failed with all the possible routes.")
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else:
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# Create a new LaTeX file from the original but only with failed pages
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pdf_latex_file = latex_file_re.sub("_pdflatex.tex", latex_file)
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filter_pages(latex_file, pdf_latex_file, failed_pages)
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# pdflatex call
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pdflatex_status, pdflatex_stdout = run_latex(pdflatex, pdf_latex_file)
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pdf_file = latex_file_re.sub(".pdf", pdf_latex_file)
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# GhostScript call to produce bitmaps
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gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
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'-sOutputFile="%s%%d.%s" ' \
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'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
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'-r%f "%s"' \
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% (gs, gs_device, latex_file_re.sub("", pdf_latex_file), \
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gs_ext, alpha, alpha, resolution, pdf_file)
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gs_status, gs_stdout = run_command(gs_call)
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if gs_status:
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# Give up!
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warning("Some pages failed with all the possible routes")
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else:
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# We've done it!
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pdf_log_file = latex_file_re.sub(".log", pdf_latex_file)
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pdf_metrics = legacy_extract_metrics_info(pdf_log_file)
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original_bitmap = latex_file_re.sub("%d." + output_format, pdf_latex_file)
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destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
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# Join the metrics with the those from dvips and rename the bitmap images
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join_metrics_and_rename(legacy_metrics, pdf_metrics, failed_pages,
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original_bitmap, destination_bitmap)
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# The file has been processed through latex and we expect dvi output.
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# Run dvips, taking note whether it was successful.
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def legacy_conversion_step2(latex_file, dpi, output_format, skipMetrics = False):
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# External programs used by the script.
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dvips = find_exe_or_terminate(["dvips"])
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# Run the dvi file through dvips.
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dvi_file = latex_file_re.sub(".dvi", latex_file)
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ps_file = latex_file_re.sub(".ps", latex_file)
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dvips_call = '%s -i -o "%s" "%s"' % (dvips, ps_file, dvi_file)
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dvips_failed = False
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dvips_status, dvips_stdout = run_command(dvips_call)
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if dvips_status:
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warning('Failed: %s %s ... looking for PDF' \
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% (os.path.basename(dvips), dvi_file))
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dvips_failed = True
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return legacy_conversion_step3(latex_file, dpi, output_format, dvips_failed, skipMetrics)
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# Either latex and dvips have been run and we have a ps file, or
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# pdflatex has been run and we have a pdf file. Proceed with gs.
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def legacy_conversion_step3(latex_file, dpi, output_format, dvips_failed, skipMetrics = False):
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# External programs used by the script.
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gs = find_exe_or_terminate(["gswin32c", "gswin64c", "gs"])
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pnmcrop = find_exe(["pnmcrop"])
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# Files to process
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pdf_file = latex_file_re.sub(".pdf", latex_file)
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ps_file = latex_file_re.sub(".ps", latex_file)
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# Extract resolution data for gs from the log file.
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log_file = latex_file_re.sub(".log", latex_file)
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resolution = extract_resolution(log_file, dpi)
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# Older versions of gs have problems with a large degree of
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# anti-aliasing at high resolutions
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alpha = 4
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if resolution > 150:
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alpha = 2
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gs_device = "png16m"
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gs_ext = "png"
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if output_format == "ppm":
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gs_device = "pnmraw"
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gs_ext = "ppm"
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# Extract the metrics from the log file
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legacy_metrics = legacy_extract_metrics_info(log_file)
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# List of pages which failed to produce a correct output
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failed_pages = []
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# Generate the bitmap images
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if dvips_failed:
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# dvips failed, maybe there's a PDF, try to produce bitmaps
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gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
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'-sOutputFile="%s%%d.%s" ' \
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'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
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'-r%f "%s"' \
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% (gs, gs_device, latex_file_re.sub("", latex_file), \
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gs_ext, alpha, alpha, resolution, pdf_file)
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gs_status, gs_stdout = run_command(gs_call)
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if gs_status:
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error("Failed: %s %s" % (os.path.basename(gs), ps_file))
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else:
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# Model for calling gs on each file
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gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=%s ' \
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'-sOutputFile="%s%%d.%s" ' \
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'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
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'-r%f "%%s"' \
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% (gs, gs_device, latex_file_re.sub("", latex_file), \
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gs_ext, alpha, alpha, resolution)
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i = 0
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# Collect all the PostScript files (like *.001, *.002, ...)
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ps_files = glob.glob("%s.[0-9][0-9][0-9]" % latex_file_re.sub("", latex_file))
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ps_files.sort()
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# Call GhostScript for each file
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for file in ps_files:
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i = i + 1
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progress("Processing page %s, file %s" % (i, file))
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gs_status, gs_stdout = run_command(gs_call % (i, file))
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if gs_status:
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# gs failed, keep track of this
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warning("Ghostscript failed on page %s, file %s" % (i, file))
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failed_pages.append(i)
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# Pass failed pages to pdflatex
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if len(failed_pages) > 0:
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legacy_conversion_pdflatex(latex_file, failed_pages, legacy_metrics, gs,
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gs_device, gs_ext, alpha, resolution, output_format)
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# Crop the images
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if pnmcrop != None:
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crop_files(pnmcrop, latex_file_re.sub("", latex_file))
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# Allow to skip .metrics creation for custom management
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# (see the dvipng method)
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if not skipMetrics:
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# Extract metrics info from the log file.
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metrics_file = latex_file_re.sub(".metrics", latex_file)
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write_metrics_info(legacy_metrics, metrics_file)
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return (0, legacy_metrics)
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if __name__ == "__main__":
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sys.exit(legacy_conversion(sys.argv)[0])
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