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https://git.lyx.org/repos/lyx.git
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a2e688065a
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8675 a592a061-630c-0410-9148-cb99ea01b6c8
208 lines
6.1 KiB
Python
Executable File
208 lines
6.1 KiB
Python
Executable File
#! /usr/bin/env python
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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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# * 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 five arguments:
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# FORMAT: either 'png' or 'ppm'. The desired output format.
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# TEXFILE: the name of the .tex file to be converted.
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# DPI: a scale factor, passed to dvipng.
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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]+.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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import glob, os, re, string, sys
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from legacy_lyxpreview2ppm import legacy_conversion
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# Pre-compiled regular expressions.
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hexcolor_re = re.compile("^[0-9a-fA-F]{6}$")
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latex_file_re = re.compile("\.tex$")
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def usage(prog_name):
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return "Usage: %s <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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def error(message):
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sys.stderr.write(message + '\n')
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sys.exit(1)
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def find_exe(candidates, path):
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for prog in candidates:
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for directory in path:
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full_path = os.path.join(directory, prog)
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if os.access(full_path, os.X_OK):
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return full_path
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return None
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def find_exe_or_terminate(candidates, path):
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exe = find_exe(candidates, path)
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if exe == None:
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error("Unable to find executable from '%s'" % string.join(candidates))
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return exe
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def run_command(cmd):
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handle = os.popen(cmd, 'r')
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cmd_stdout = handle.read()
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cmd_status = handle.close()
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return cmd_status, cmd_stdout
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def make_texcolor(hexcolor):
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# Test that the input string contains 6 hexadecimal chars.
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if not hexcolor_re.match(hexcolor):
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error("Cannot convert color '%s'" % hexcolor)
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red = float(string.atoi(hexcolor[0:2], 16)) / 255.0
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green = float(string.atoi(hexcolor[2:4], 16)) / 255.0
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blue = float(string.atoi(hexcolor[4:6], 16)) / 255.0
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return "rgb %f %f %f" % (red, green, blue)
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def extract_metrics_info(dvipng_stdout, metrics_file):
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metrics = open(metrics_file, 'w')
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metrics_re = re.compile("\[([0-9]+) depth=(-?[0-9]+) height=(-?[0-9]+)")
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success = 0
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pos = 0
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while 1:
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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(2))
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ascent = string.atof(match.group(3))
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frac = 0.5
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if abs(ascent + descent) > 0.1:
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frac = ascent / (ascent + descent)
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metrics.write("Snippet %s %f\n" % (match.group(1), frac))
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pos = match.end(3) + 2
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return success
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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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def main(argv):
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# Parse and manipulate the command line arguments.
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if len(argv) != 6:
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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])
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bg_color = make_texcolor(argv[5])
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# External programs used by the script.
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path = string.split(os.getenv("PATH"), os.pathsep)
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latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
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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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if output_format == "ppm":
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return legacy_conversion(argv)
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else:
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error("The old 'dvi->ps->ppm' conversion requires "
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"ppm as the output format")
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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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# 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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error("%s failed to compile %s" \
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% (os.path.basename(latex), latex_file))
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# Run the dvi file through dvipng.
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dvi_file = latex_file_re.sub(".dvi", latex_file)
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dvipng_call = "%s -Ttight -depth -height -D %d -fg '%s' -bg '%s' %s" \
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% (dvipng, dpi, fg_color, bg_color, 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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error("%s failed to generate images from %s" \
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% (os.path.basename(dvipng), dvi_file))
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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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if not extract_metrics_info(dvipng_stdout, metrics_file):
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error("Failed to extract metrics info from dvipng")
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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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return 0
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if __name__ == "__main__":
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main(sys.argv)
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