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1c55d1fc77
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@21136 a592a061-630c-0410-9148-cb99ea01b6c8
300 lines
9.9 KiB
Python
300 lines
9.9 KiB
Python
#! /usr/bin/env python
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# -*- 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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# 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
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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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# * A latex executable;
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# * preview.sty;
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# * dvips;
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# * gs;
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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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# The script uses the deprecated dvi->ps->ppm conversion route.
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# If possible, please grab 'dvipng'; it's faster and more robust.
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# If you have it then this script will not be invoked by
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# lyxpreview2bitmap.py.
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# Warning: this legacy support will be removed one day...
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import glob, os, pipes, re, string, sys
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from lyxpreview_tools import copyfileobj, error, find_exe, \
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find_exe_or_terminate, mkstemp, run_command
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# Pre-compiled regular expression.
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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> 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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def extract_metrics_info(log_file, metrics_file):
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metrics = open(metrics_file, 'w')
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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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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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metrics.write("Snippet %s %f\n" % (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 extract_metrics_info! Unable to open "%s"' % log_file)
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warning(`sys.exc_type` + ',' + `sys.exc_value`)
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return success
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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("(\\\\usepackage\[[^]]+)(\]{preview})")
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tmp = mkstemp()
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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_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("%s,dvips,tightpage%s\n\n" \
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"\\AtBeginDocument{\\AtBeginDvi{%%\n" \
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"\\special{!userdict begin/bop-hook{//bop-hook exec\n" \
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"<%s%s>{255 div}forall setrgbcolor\n" \
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"clippath fill setrgbcolor}bind def end}}}\n" \
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% (match.group(1), match.group(2), fg_color, bg_color))
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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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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):
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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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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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if output_format != "ppm":
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error("This script will generate ppm format images only.")
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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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path = string.split(os.environ["PATH"], os.pathsep)
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latex = find_exe_or_terminate(["pplatex", "platex", "latex2e", "latex"], path)
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dvips = find_exe_or_terminate(["dvips"], path)
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gs = find_exe_or_terminate(["gswin32c", "gs"], path)
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pnmcrop = find_exe(["pnmcrop"], path)
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# Move color information 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 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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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 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 -o "%s" "%s"' % (dvips, ps_file, dvi_file)
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dvips_status, dvips_stdout = run_command(dvips_call)
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if dvips_status != None:
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error("Failed: %s %s" % (os.path.basename(dvips), dvi_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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# Generate the bitmap images
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gs_call = '%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw ' \
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'-sOutputFile="%s%%d.ppm" ' \
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'-dGraphicsAlphaBit=%d -dTextAlphaBits=%d ' \
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'-r%f "%s"' \
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% (gs, latex_file_re.sub("", latex_file), \
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alpha, alpha, resolution, ps_file)
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gs_status, gs_stdout = run_command(gs_call)
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if gs_status != None:
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error("Failed: %s %s" % (os.path.basename(gs), ps_file))
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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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# Extract metrics info from the log file.
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metrics_file = latex_file_re.sub(".metrics", latex_file)
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if not extract_metrics_info(log_file, metrics_file):
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error("Failed to extract metrics info from %s" % log_file)
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return 0
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if __name__ == "__main__":
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legacy_conversion(sys.argv)
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