--- /dev/null
+#! /usr/bin/env python
+
+# file legacy_lyxpreview2ppm.py
+# This file is part of LyX, the document processor.
+# Licence details can be found in the file COPYING.
+
+# author Angus Leeming
+
+# Full author contact details are available in file CREDITS
+
+# This script converts a LaTeX file to a bunch of ppm files using the
+# deprecated dvi->ps->ppm conversion route.
+
+# If possible, please grab 'dvipng'; it's faster and more robust.
+# This legacy support will be removed one day...
+
+import glob, os, re, string, sys
+import pipes, shutil, tempfile
+
+
+# Pre-compiled regular expressions.
+latex_file_re = re.compile("\.tex$")
+
+
+def usage(prog_name):
+ return "Usage: %s <latex file> <dpi> <fg color> <bg color>\n"\
+ "\twhere the colors are hexadecimal strings, eg 'faf0e6'"\
+ % prog_name
+
+
+def error(message):
+ sys.stderr.write(message + '\n')
+ sys.exit(1)
+
+
+def find_exe(candidates, path):
+ for prog in candidates:
+ for directory in path:
+ full_path = os.path.join(directory, prog)
+ if os.access(full_path, os.X_OK):
+ return full_path
+
+ return None
+
+
+def find_exe_or_terminate(candidates, path):
+ exe = find_exe(candidates, path)
+ if exe == None:
+ error("Unable to find executable from '%s'" % string.join(candidates))
+
+ return exe
+
+
+def run_command(cmd):
+ handle = os.popen(cmd, 'r')
+ cmd_stdout = handle.read()
+ cmd_status = handle.close()
+
+ return cmd_status, cmd_stdout
+
+
+def extract_metrics_info(log_file, metrics_file):
+ metrics = open(metrics_file, 'w')
+
+ log_re = re.compile("Preview: ([ST])")
+ data_re = re.compile("(-?[0-9]+) (-?[0-9]+) (-?[0-9]+) (-?[0-9]+)")
+
+ tp_ascent = 0.0
+ tp_descent = 0.0
+
+ success = 0
+ for line in open(log_file, 'r').readlines():
+ match = log_re.match(line)
+ if match == None:
+ continue
+
+ snippet = (match.group(1) == 'S')
+ success = 1
+ match = data_re.search(line)
+ if match == None:
+ error("Unexpected data in %s\n%s" % (log_file, line))
+
+ if snippet:
+ ascent = string.atof(match.group(2)) + tp_ascent
+ descent = string.atof(match.group(3)) - tp_descent
+
+ frac = 0.5
+ if abs(ascent + descent) > 0.1:
+ frac = ascent / (ascent + descent)
+
+ metrics.write("Snippet %s %f\n" % (match.group(1), frac))
+
+ else:
+ tp_descent = string.atof(match.group(2))
+ tp_ascent = string.atof(match.group(4))
+
+ return success
+
+
+def extract_resolution(log_file, dpi):
+ fontsize_re = re.compile("Preview: Fontsize")
+ magnification_re = re.compile("Preview: Magnification")
+ extract_decimal_re = re.compile("([0-9\.]+)")
+ extract_integer_re = re.compile("([0-9]+)")
+
+ found_fontsize = 0
+ found_magnification = 0
+
+ # Default values
+ magnification = 1000.0
+ fontsize = 0.0
+
+ for line in open(log_file, 'r').readlines():
+ if found_fontsize and found_magnification:
+ break
+
+ if not found_fontsize:
+ match = fontsize_re.match(line)
+ if match != None:
+ match = extract_decimal_re.search(line)
+ if match == None:
+ error("Unable to parse: %s" % line)
+ fontsize = string.atof(match.group(1))
+ found_fontsize = 1
+ continue
+
+ if not found_magnification:
+ match = magnification_re.match(line)
+ if match != None:
+ match = extract_integer_re.search(line)
+ if match == None:
+ error("Unable to parse: %s" % line)
+ magnification = string.atof(match.group(1))
+ found_magnification = 1
+ continue
+
+ return dpi * (10.0 / fontsize) * (1000.0 / magnification)
+
+
+def get_version_info():
+ version_re = re.compile("([0-9])\.([0-9])")
+
+ match = version_re.match(sys.version)
+ if match == None:
+ error("Unable to extract version info from 'sys.version'")
+
+ return string.atoi(match.group(1)), string.atoi(match.group(2))
+
+
+def mkstemp():
+ major, minor = get_version_info()
+
+ if major >= 2 and minor >= 3:
+ return tempfile.mkstemp()
+
+ tmp_name = tempfile.mktemp()
+ return open(tmp_name, 'w'), tmp_name
+
+
+def legacy_latex_file(latex_file, fg_color, bg_color):
+ use_preview_re = re.compile("(\\\\usepackage\[[^]]+)(\]{preview})")
+
+ tmp, tmp_name = mkstemp()
+
+ success = 0
+ for line in open(latex_file, 'r').readlines():
+ match = use_preview_re.match(line)
+ if match == None:
+ tmp.write(line)
+ continue
+
+ success = 1
+ tmp.write("%s,dvips,tightpage%s\n\n" \
+ "\\AtBeginDocument{\\AtBeginDvi{%%\n" \
+ "\\special{!userdict begin/bop-hook{//bop-hook exec\n" \
+ "<%s%s>{255 div}forall setrgbcolor\n" \
+ "clippath fill setrgbcolor}bind def end}}}\n" \
+ % (match.group(1), match.group(2), fg_color, bg_color))
+
+ if success:
+ tmp.close()
+ shutil.copy(tmp_name, latex_file)
+ os.remove(tmp_name)
+
+ return success
+
+
+def crop_files(pnmcrop, basename):
+ t = pipes.Template()
+ t.append("%s -left $IN" % pnmcrop, 'f-')
+ t.append("%s -right > $OUT" % pnmcrop, '-f')
+
+ tmp, tmp_name = mkstemp()
+ tmp.close()
+ os.remove(tmp_name)
+
+ for file in glob.glob("%s*.ppm" % basename):
+ if t.copy(file, tmp_name):
+ shutil.copy(tmp_name, file)
+ os.remove(tmp_name)
+
+
+def legacy_conversion(argv):
+ # Parse and manipulate the command line arguments.
+ if len(argv) != 6:
+ error(usage(argv[0]))
+
+ # Ignore argv[1]
+
+ dir, latex_file = os.path.split(argv[2])
+ if len(dir) != 0:
+ os.chdir(dir)
+
+ dpi = string.atoi(argv[3])
+ fg_color = argv[4]
+ bg_color = argv[5]
+
+ # External programs used by the script.
+ path = string.split(os.getenv("PATH"), os.pathsep)
+ latex = find_exe_or_terminate(["pplatex", "latex2e", "latex"], path)
+ dvips = find_exe_or_terminate(["dvips"], path)
+ gs = find_exe_or_terminate(["gs"], path)
+ pnmcrop = find_exe(["pnmcrop"], path)
+
+ # Move color information into the latex file.
+ if not legacy_latex_file(latex_file, fg_color, bg_color):
+ error("Unable to move color info into the latex file")
+
+ # Compile the latex file.
+ latex_call = "%s %s" % (latex, latex_file)
+
+ latex_status, latex_stdout = run_command(latex_call)
+ if latex_status != None:
+ error("%s failed to compile %s" \
+ % (os.path.basename(latex), latex_file))
+
+ # Run the dvi file through dvips.
+ dvi_file = latex_file_re.sub(".dvi", latex_file)
+ ps_file = latex_file_re.sub(".ps", latex_file)
+
+ dvips_call = "%s -o %s %s" % (dvips, ps_file, dvi_file)
+
+ dvips_status, dvips_stdout = run_command(dvips_call)
+ if dvips_status != None:
+ error("Failed: %s %s" % (os.path.basename(dvips), dvi_file))
+
+ # Extract resolution data for gs from the log file.
+ log_file = latex_file_re.sub(".log", latex_file)
+ resolution = extract_resolution(log_file, dpi)
+
+ # Older versions of gs have problems with a large degree of
+ # anti-aliasing at high resolutions
+ alpha = 4
+ if resolution > 150:
+ alpha = 2
+
+ # Generate the bitmap images
+ gs_call = "%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pnmraw " \
+ "-sOutputFile=%s%%d.ppm " \
+ "-dGraphicsAlphaBit=%d -dTextAlphaBits=%d " \
+ "-r%f %s" \
+ % (gs, latex_file_re.sub("", latex_file), \
+ alpha, alpha, resolution, ps_file)
+
+ gs_status, gs_stdout = run_command(gs_call)
+ if gs_status != None:
+ error("Failed: %s %s" % (os.path.basename(gs), ps_file))
+
+ # Crop the images
+ if pnmcrop != None:
+ crop_files(pnmcrop, latex_file_re.sub("", latex_file))
+
+ # Extract metrics info from the log file.
+ metrics_file = latex_file_re.sub(".metrics", latex_file)
+ if not extract_metrics_info(log_file, metrics_file):
+ error("Failed to extract metrics info from %s" % log_file)
+
+ return 0
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