mirror of
https://git.lyx.org/repos/lyx.git
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2e66a01e8f
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8760 a592a061-630c-0410-9148-cb99ea01b6c8
323 lines
9.2 KiB
Python
323 lines
9.2 KiB
Python
#! /usr/bin/env python
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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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# This script converts a LaTeX file to a bunch of ppm files using the
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# 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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# This legacy support will be removed one day...
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import glob, os, re, string, sys
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import pipes, tempfile
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# Pre-compiled regular expressions.
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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 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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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.atof(match.group(2)) + tp_ascent
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descent = string.atof(match.group(3)) - tp_descent
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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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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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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 = 0.0
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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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return dpi * (10.0 / fontsize) * (1000.0 / magnification)
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def get_version_info():
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version_re = re.compile("([0-9])\.([0-9])")
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match = version_re.match(sys.version)
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if match == None:
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error("Unable to extract version info from 'sys.version'")
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return string.atoi(match.group(1)), string.atoi(match.group(2))
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def copyfileobj(fsrc, fdst, rewind=0, length=16*1024):
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"""copy data from file-like object fsrc to file-like object fdst"""
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if rewind:
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fsrc.flush()
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fsrc.seek(0)
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while 1:
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buf = fsrc.read(length)
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if not buf:
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break
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fdst.write(buf)
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class TempFile:
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"""clone of tempfile.TemporaryFile to use with python < 2.0."""
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# Cache the unlinker so we don't get spurious errors at shutdown
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# when the module-level "os" is None'd out. Note that this must
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# be referenced as self.unlink, because the name TempFile
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# may also get None'd out before __del__ is called.
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unlink = os.unlink
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def __init__(self):
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self.filename = tempfile.mktemp()
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self.file = open(self.filename,"w+b")
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self.close_called = 0
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def close(self):
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if not self.close_called:
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self.close_called = 1
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self.file.close()
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self.unlink(self.filename)
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def __del__(self):
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self.close()
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def read(self, size = -1):
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return self.file.read(size)
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def write(self, line):
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return self.file.write(line)
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def seek(self, offset):
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return self.file.seek(offset)
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def flush(self):
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return self.file.flush()
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def mkstemp():
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"""create a secure temporary file and return its object-like file"""
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major, minor = get_version_info()
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if major >= 2 and minor >= 0:
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return tempfile.TemporaryFile()
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else:
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return TempFile()
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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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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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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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# Ignore 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 = 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.getenv("PATH"), os.pathsep)
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latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
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dvips = find_exe_or_terminate(["dvips"], path)
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gs = find_exe_or_terminate(["gswin32", "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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