mirror of
https://git.lyx.org/repos/lyx.git
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17e4135613
respect to r38709, so no status.20x entry is necessary. git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_2_0_X@38711 a592a061-630c-0410-9148-cb99ea01b6c8
417 lines
15 KiB
Python
Executable File
417 lines
15 KiB
Python
Executable File
#! /usr/bin/env python
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# -*- 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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# * 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 png 0lyxpreview.tex 128 000000 faf0e6
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# This script takes six arguments:
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# FORMAT: The desired output format. Either 'png' or 'ppm'.
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# TEXFILE: the name of the .tex file to be converted.
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# DPI: 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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# CONVERTER: the converter (optional). Default is latex.
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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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import glob, os, re, string, sys
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from legacy_lyxpreview2ppm import legacy_conversion, \
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legacy_conversion_step2, legacy_extract_metrics_info, filter_pages
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from lyxpreview_tools import copyfileobj, error, find_exe, \
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find_exe_or_terminate, make_texcolor, mkstemp, run_command, warning, \
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write_metrics_info, join_metrics_and_rename
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# Pre-compiled regular expressions.
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latex_file_re = re.compile("\.tex$")
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# PATH environment variable
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path = string.split(os.environ["PATH"], os.pathsep)
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def usage(prog_name):
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return "Usage: %s <format> <latex file> <dpi> <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 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 = string.atof(match.group(1))
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ascent = string.atof(match.group(2))
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frac = 0.5
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if 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 color_pdf(latex_file, bg_color, fg_color):
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use_preview_pdf_re = re.compile("(\s*\\\\usepackage\[[^]]+)((pdftex|xetex)\]{preview})")
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tmp = mkstemp()
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fg = ""
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if fg_color != "0.000000,0.000000,0.000000":
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fg = ' \\AtBeginDocument{\\let\\oldpreview\\preview\\renewcommand\\preview{\\oldpreview\\color[rgb]{%s}}}\n' % (fg_color)
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success = 0
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try:
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for line in open(latex_file, 'r').readlines():
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match = use_preview_pdf_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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tmp.write(" \\usepackage{color}\n" \
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" \\pagecolor[rgb]{%s}\n" \
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"%s" \
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"%s\n" \
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% (bg_color, fg, match.group()))
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continue
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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 color_pdf! Unable to open "%s"' % latex_file)
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warning(`sys.exc_type` + ',' + `sys.exc_value`)
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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 fix_latex_file(latex_file):
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documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
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tmp = mkstemp()
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changed = 0
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for line in open(latex_file, 'r').readlines():
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match = documentclass_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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changed = 1
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tmp.write("%s%s\n" % (match.group(1), match.group(3)))
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if changed:
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copyfileobj(tmp, open(latex_file,"wb"), 1)
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return
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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 != None:
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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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# page_count: total number of pages
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# pages_parameter: parameter for dvipng to exclude pages with PostScript
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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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# This is required for correct rendering of PSTricks and TikZ
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dv2dt = find_exe_or_terminate(["dv2dt"], path)
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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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# Parse the dtl file looking for PostScript specials.
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# Pages using PostScript specials are recorded in ps_pages and then
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# used to create a different LaTeX file for processing in legacy mode.
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page_has_ps = False
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page_index = 0
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ps_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_index += 1
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# End of page
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if line.startswith("eop") and page_has_ps:
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# We save in a list all the PostScript pages
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ps_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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page_has_ps = True
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# Create the -pp parameter for dvipng
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pages_parameter = ""
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if len(ps_pages) > 0 and len(ps_pages) < page_index:
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# Don't process Postscript 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 xrange(1, page_index + 1):
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if (not index in ps_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_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_pages) and (not skip) and (last != index):
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pages_parameter += "-" + str(index)
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return (ps_pages, page_index, pages_parameter)
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def main(argv):
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# Parse and manipulate the command line arguments.
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if len(argv) != 6 and len(argv) != 7:
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error(usage(argv[0]))
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output_format = string.lower(argv[1])
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dir, latex_file = os.path.split(argv[2])
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if len(dir) != 0:
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os.chdir(dir)
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dpi = string.atoi(argv[3])
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fg_color = make_texcolor(argv[4], False)
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bg_color = make_texcolor(argv[5], False)
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fg_color_gr = make_texcolor(argv[4], True)
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bg_color_gr = make_texcolor(argv[5], True)
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# External programs used by the script.
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if len(argv) == 7:
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latex = argv[6]
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else:
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latex = find_exe_or_terminate(["latex", "pplatex", "platex", "latex2e"], path)
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# Omit font size specification in latex file.
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fix_latex_file(latex_file)
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# This can go once dvipng becomes widespread.
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dvipng = find_exe(["dvipng"], path)
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if dvipng == None:
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# The data is input to legacy_conversion in as similar
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# as possible a manner to that input to the code used in
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# LyX 1.3.x.
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vec = [ argv[0], argv[2], argv[3], argv[1], argv[4], argv[5], latex ]
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return legacy_conversion(vec)
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pngtopnm = ""
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if output_format == "ppm":
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pngtopnm = find_exe_or_terminate(["pngtopnm"], path)
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# Move color information for PDF into the latex file.
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if not color_pdf(latex_file, bg_color_gr, fg_color_gr):
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error("Unable to move color info into the latex file")
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# Compile the latex file.
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latex_call = '%s "%s"' % (latex, latex_file)
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latex_status, latex_stdout = run_command(latex_call)
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if latex_status != None:
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warning("%s had problems compiling %s" \
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% (os.path.basename(latex), latex_file))
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if latex == "xelatex":
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warning("Using XeTeX")
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# FIXME: skip unnecessary dvips trial in legacy_conversion_step2
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return legacy_conversion_step2(latex_file, dpi, output_format)
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# The dvi output file name
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dvi_file = latex_file_re.sub(".dvi", latex_file)
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# If there's no DVI output, look for PDF and go to legacy or fail
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if not os.path.isfile(dvi_file):
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# No DVI, is there a PDF?
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pdf_file = latex_file_re.sub(".pdf", latex_file)
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if os.path.isfile(pdf_file):
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warning("%s produced a PDF output, fallback to legacy." % \
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(os.path.basename(latex)))
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return legacy_conversion_step2(latex_file, dpi, output_format)
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else:
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error("No DVI or PDF output. %s failed." \
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% (os.path.basename(latex)))
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# Look for PS literals in DVI pages
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# ps_pages: list of page indexes of pages containing PS literals
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# page_count: total number of pages
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# pages_parameter: parameter for dvipng to exclude pages with PostScript
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(ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
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# If all pages need PostScript, directly use the legacy method.
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if len(ps_pages) == page_count:
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vec = [argv[0], argv[2], argv[3], argv[1], argv[4], argv[5], latex]
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return legacy_conversion(vec)
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# Run the dvi file through dvipng.
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dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
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% (dvipng, dpi, fg_color, bg_color, pages_parameter, dvi_file)
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dvipng_status, dvipng_stdout = run_command(dvipng_call)
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if dvipng_status != None:
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warning("%s failed to generate images from %s... fallback to legacy method" \
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% (os.path.basename(dvipng), dvi_file))
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# FIXME: skip unnecessary dvips trial in legacy_conversion_step2
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return legacy_conversion_step2(latex_file, dpi, output_format)
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# Extract metrics info from dvipng_stdout.
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metrics_file = latex_file_re.sub(".metrics", latex_file)
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dvipng_metrics = extract_metrics_info(dvipng_stdout)
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# If some pages require PostScript pass them to legacy method
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if len(ps_pages) > 0:
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# Create a new LaTeX file just for the snippets needing
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# the legacy method
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legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
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filter_pages(latex_file, legacy_latex_file, ps_pages)
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# Pass the new LaTeX file to the legacy method
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vec = [ argv[0], latex_file_re.sub("_legacy.tex", argv[2]), \
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argv[3], argv[1], argv[4], argv[5], latex ]
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legacy_metrics = legacy_conversion(vec, True)[1]
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# Now we need to mix metrics data from dvipng and the legacy method
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original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
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destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
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# Join metrics from dvipng and legacy, and rename legacy bitmaps
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join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
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original_bitmap, destination_bitmap)
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# Convert images to ppm format if necessary.
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if output_format == "ppm":
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convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
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# Actually create the .metrics file
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write_metrics_info(dvipng_metrics, metrics_file)
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return (0, dvipng_metrics)
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if __name__ == "__main__":
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exit(main(sys.argv)[0])
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