2 # -*- coding: utf-8 -*-
4 # file lyxpreview2bitmap.py
5 # This file is part of LyX, the document processor.
6 # Licence details can be found in the file COPYING.
9 # with much advice from members of the preview-latex project:
10 # David Kastrup, dak@gnu.org and
11 # Jan-Åke Larsson, jalar@mai.liu.se.
13 # Full author contact details are available in file CREDITS
15 # This script takes a LaTeX file and generates a collection of
16 # png or ppm image files, one per previewed snippet.
19 # * python 2.4 or later (subprocess module);
20 # * A latex executable;
24 # * pngtoppm (if outputing ppm format images).
26 # preview.sty and dvipng are part of the preview-latex project
27 # http://preview-latex.sourceforge.net/
29 # preview.sty can alternatively be obtained from
30 # CTAN/support/preview-latex/
33 # lyxpreview2bitmap.py --bg=faf0e6 0lyxpreview.tex
35 # This script takes one obligatory argument:
37 # <input file>: The name of the .tex file to be converted.
39 # and these optional arguments:
41 # --png, --ppm: The desired output format. Either 'png' or 'ppm'.
42 # --dpi=<res>: A scale factor, used to ascertain the resolution of the
43 # generated image which is then passed to gs.
44 # --fg=<color>: The foreground color as a hexadecimal string, eg '000000'.
45 # --bg=<color>: The background color as a hexadecimal string, eg 'faf0e6'.
46 # --latex=<exe>: The converter for latex files. Default is latex.
47 # --lilypond: Preprocess through lilypond-book. Default is false.
48 # --lilypond-book=<exe>:
49 # The converter for lytex files. Default is lilypond-book.
51 # -d, --debug Show the output from external commands.
52 # -h, --help Show an help screen and exit.
53 # -v, --verbose Show progress messages.
55 # Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
56 # if executed successfully, leave in DIR:
57 # * a (possibly large) number of image files with names
59 # * a file BASE.metrics, containing info needed by LyX to position
60 # the images correctly on the screen.
62 # What does this script do?
63 # 1) Call latex/pdflatex/xelatex/whatever (CONVERTER parameter)
64 # 2) If the output is a PDF fallback to legacy
65 # 3) Otherwise check each page of the DVI (with dv2dt) looking for
66 # PostScript literals, not well supported by dvipng. Pages
67 # containing them are passed to the legacy method in a new LaTeX file.
68 # 4) Call dvipng on the pages without PS literals
69 # 5) Join metrics info coming from both methods (legacy and dvipng)
70 # and write them to file
72 # dvipng is fast but gives problem in several cases, like with
73 # PSTricks, TikZ and other packages using PostScript literals
74 # for all these cases the legacy route is taken (step 3).
75 # Moreover dvipng can't work with PDF files, so, if the CONVERTER
76 # paramter is pdflatex we have to fallback to legacy route (step 2).
78 import getopt, glob, os, re, shutil, string, sys
80 from legacy_lyxpreview2ppm import legacy_conversion, \
81 legacy_conversion_step2, legacy_extract_metrics_info
83 from lyxpreview_tools import copyfileobj, error, filter_pages, find_exe, \
84 find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
85 latex_file_re, make_texcolor, mkstemp, pdflatex_commands, progress, \
86 run_command, warning, write_metrics_info
91 Usage: %s <options> <input file>
94 --dpi=<res>: Resolution per inch (default: 128)
95 --png, --ppm: Select the output format (default: png)
96 --fg=<color>: Foreground color (default: black, ie '000000')
97 --bg=<color>: Background color (default: white, ie 'ffffff')
98 --latex=<exe>: Specify the executable for latex (default: latex)
99 --lilypond: Preprocess through lilypond-book (default: false)
100 --lilypond-book=<exe>:
101 The executable for lilypond-book (default: lilypond-book)
103 -d, --debug: Show the output from external commands
104 -h, --help: Show this help screen and exit
105 -v, --verbose: Show progress messages
107 The colors are hexadecimal strings, eg 'faf0e6'."""
108 return msg % prog_name
110 # Returns a list of tuples containing page number and ascent fraction
111 # extracted from dvipng output.
112 # Use write_metrics_info to create the .metrics file with this info
113 def extract_metrics_info(dvipng_stdout):
114 # "\[[0-9]+" can match two kinds of numbers: page numbers from dvipng
115 # and glyph numbers from mktexpk. The glyph numbers always match
116 # "\[[0-9]+\]" while the page number never is followed by "\]". Thus:
117 page_re = re.compile("\[([0-9]+)[^]]");
118 metrics_re = re.compile("depth=(-?[0-9]+) height=(-?[0-9]+)")
125 match = page_re.search(dvipng_stdout, pos)
128 page = match.group(1)
130 match = metrics_re.search(dvipng_stdout, pos)
135 # Calculate the 'ascent fraction'.
136 descent = string.atof(match.group(1))
137 ascent = string.atof(match.group(2))
140 if ascent >= 0 or descent >= 0:
141 if abs(ascent + descent) > 0.1:
142 frac = ascent / (ascent + descent)
148 results.append((int(page), frac))
149 pos = match.end() + 2
152 error("Failed to extract metrics info from dvipng")
157 def color_pdf(latex_file, bg_color, fg_color):
158 use_preview_pdf_re = re.compile("(\s*\\\\usepackage\[[^]]+)((pdftex|xetex)\]{preview})")
163 if fg_color != "0.000000,0.000000,0.000000":
164 fg = ' \\AtBeginDocument{\\let\\oldpreview\\preview\\renewcommand\\preview{\\oldpreview\\color[rgb]{%s}}}\n' % (fg_color)
168 for line in open(latex_file, 'r').readlines():
169 match = use_preview_pdf_re.match(line)
174 tmp.write(" \\usepackage{color}\n" \
175 " \\pagecolor[rgb]{%s}\n" \
178 % (bg_color, fg, match.group()))
182 # Unable to open the file, but do nothing here because
183 # the calling function will act on the value of 'success'.
184 warning('Warning in color_pdf! Unable to open "%s"' % latex_file)
185 warning(`sys.exc_type` + ',' + `sys.exc_value`)
188 copyfileobj(tmp, open(latex_file,"wb"), 1)
193 def fix_latex_file(latex_file):
194 documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
199 for line in open(latex_file, 'r').readlines():
200 match = documentclass_re.match(line)
206 tmp.write("%s%s\n" % (match.group(1), match.group(3)))
209 copyfileobj(tmp, open(latex_file,"wb"), 1)
214 def convert_to_ppm_format(pngtopnm, basename):
215 png_file_re = re.compile("\.png$")
217 for png_file in glob.glob("%s*.png" % basename):
218 ppm_file = png_file_re.sub(".ppm", png_file)
220 p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
221 p2p_status, p2p_stdout = run_command(p2p_cmd)
223 error("Unable to convert %s to ppm format" % png_file)
225 ppm = open(ppm_file, 'w')
226 ppm.write(p2p_stdout)
229 # Returns a tuple of:
230 # ps_pages: list of page indexes of pages containing PS literals
231 # page_count: total number of pages
232 # pages_parameter: parameter for dvipng to exclude pages with PostScript
233 def find_ps_pages(dvi_file):
235 # FIXME: try with pdflatex
236 if not os.path.isfile(dvi_file):
237 error("No DVI output.")
239 # Check for PostScript specials in the dvi, badly supported by dvipng
240 # This is required for correct rendering of PSTricks and TikZ
241 dv2dt = find_exe_or_terminate(["dv2dt"])
242 dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
244 # The output from dv2dt goes to stdout
245 dv2dt_status, dv2dt_output = run_command(dv2dt_call)
246 psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
248 # Parse the dtl file looking for PostScript specials.
249 # Pages using PostScript specials are recorded in ps_pages and then
250 # used to create a different LaTeX file for processing in legacy mode.
255 for line in dv2dt_output.split("\n"):
257 if line.startswith("bop"):
262 if line.startswith("eop") and page_has_ps:
263 # We save in a list all the PostScript pages
264 ps_pages.append(page_index)
266 if psliteral_re.match(line) != None:
267 # Literal PostScript special detected!
270 # Create the -pp parameter for dvipng
272 if len(ps_pages) > 0 and len(ps_pages) < page_index:
273 # Don't process Postscript pages with dvipng by selecting the
274 # wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
275 pages_parameter = " -pp "
279 # Use page ranges, as a list of pages could exceed command line
280 # maximum length (especially under Win32)
281 for index in xrange(1, page_index + 1):
282 if (not index in ps_pages) and skip:
283 # We were skipping pages but current page shouldn't be skipped.
284 # Add this page to -pp, it could stay alone or become the
286 pages_parameter += str(index)
287 # Save the starting index to avoid things such as "11-11"
289 # We're not skipping anymore
291 elif (index in ps_pages) and (not skip):
292 # We weren't skipping but current page should be skipped
293 if last != index - 1:
294 # If the start index of the range is the previous page
295 # then it's not a range
296 pages_parameter += "-" + str(index - 1)
299 pages_parameter += ","
303 # Remove the trailing separator
304 pages_parameter = pages_parameter.rstrip(",")
305 # We've to manage the case in which the last page is closing a range
306 if (not index in ps_pages) and (not skip) and (last != index):
307 pages_parameter += "-" + str(index)
309 return (ps_pages, page_index, pages_parameter)
319 output_format = "png"
320 script_name = argv[0]
322 # Parse and manipulate the command line arguments.
324 (opts, args) = getopt.gnu_getopt(argv[1:], "dhv", ["bg=", "debug",
325 "dpi=", "fg=", "help", "latex=", "lilypond", "lilypond-book=",
326 "png", "ppm", "verbose"])
327 except getopt.GetoptError, err:
328 error("%s\n%s" % (err, usage(script_name)))
331 for opt, val in opts:
332 if opt in ("-h", "--help"):
333 print usage(script_name)
337 elif opt in ("-d", "--debug"):
338 import lyxpreview_tools
339 lyxpreview_tools.debug = True
342 dpi = string.atoi(val)
344 error("Cannot convert %s to an integer value" % val)
347 elif opt == "--latex":
349 elif opt == "--lilypond":
351 elif opt == "--lilypond-book":
352 lilypond_book = [val]
353 elif opt in ("--png", "--ppm"):
354 output_format = opt[2:]
355 elif opt in ("-v", "--verbose"):
356 import lyxpreview_tools
357 lyxpreview_tools.verbose = True
359 # Determine input file
361 err = "A single input file is required, %s given" % (len(args) or "none")
362 error("%s\n%s" % (err, usage(script_name)))
365 dir, latex_file = os.path.split(input_path)
368 progress("Starting %s..." % script_name)
369 progress("Output format: %s" % output_format)
370 progress("Foreground color: %s" % fg_color)
371 progress("Background color: %s" % bg_color)
372 progress("Resolution (dpi): %s" % dpi)
373 progress("File to process: %s" % input_path)
375 # Check for the input file
376 if not os.path.exists(input_path):
377 error('File "%s" not found.' % input_path)
381 fg_color_dvipng = make_texcolor(fg_color, False)
382 bg_color_dvipng = make_texcolor(bg_color, False)
384 fg_color_gr = make_texcolor(fg_color, True)
385 bg_color_gr = make_texcolor(bg_color, True)
387 # External programs used by the script.
388 latex = find_exe_or_terminate(latex or latex_commands)
390 lilypond_book = find_exe_or_terminate(lilypond_book or ["lilypond-book"])
392 # These flavors of latex are known to produce pdf output
393 pdf_output = latex in pdflatex_commands
395 progress("Latex command: %s" % latex)
396 progress("Latex produces pdf output: %s" % pdf_output)
397 progress("Lilypond-book command: %s" % lilypond_book)
398 progress("Preprocess through lilypond-book: %s" % lilypond)
399 progress("Altering the latex file for font size and colors")
401 # Omit font size specification in latex file.
402 if not fix_latex_file(latex_file):
403 warning("Unable to remove font size from the latex file")
406 progress("Preprocess the latex file through %s" % lilypond_book)
408 lilypond_book += ' --pdf'
410 # Make a copy of the latex file
411 lytex_file = latex_file_re.sub(".lytex", latex_file)
412 shutil.copyfile(latex_file, lytex_file)
414 # Preprocess the latex file through lilypond-book.
415 lytex_call = '%s --safe --latex-program=%s "%s"' % (lilypond_book,
417 lytex_status, lytex_stdout = run_command(lytex_call)
419 warning("%s failed to compile %s" \
420 % (os.path.basename(lilypond_book), lytex_file))
422 # This can go once dvipng becomes widespread.
423 dvipng = find_exe(["dvipng"])
425 # The data is input to legacy_conversion in as similar
426 # as possible a manner to that input to the code used in
428 progress("Using the legacy conversion method (dvipng not found)")
429 vec = [ script_name, input_path, str(dpi), output_format, fg_color, bg_color, latex ]
430 return legacy_conversion(vec)
433 if output_format == "ppm":
434 pngtopnm = find_exe_or_terminate(["pngtopnm"])
436 # Move color information for PDF into the latex file.
437 if not color_pdf(latex_file, bg_color_gr, fg_color_gr):
438 warning("Unable to move color info into the latex file")
440 # Compile the latex file.
441 latex_call = '%s "%s"' % (latex, latex_file)
443 latex_status, latex_stdout = run_command(latex_call)
445 warning("%s had problems compiling %s" \
446 % (os.path.basename(latex), latex_file))
448 if latex == "xelatex":
449 warning("Using XeTeX")
450 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
451 return legacy_conversion_step2(latex_file, dpi, output_format)
453 # The dvi output file name
454 dvi_file = latex_file_re.sub(".dvi", latex_file)
456 # If there's no DVI output, look for PDF and go to legacy or fail
457 if not os.path.isfile(dvi_file):
458 # No DVI, is there a PDF?
459 pdf_file = latex_file_re.sub(".pdf", latex_file)
460 if os.path.isfile(pdf_file):
461 progress("%s produced a PDF output, fallback to legacy." \
462 % (os.path.basename(latex)))
463 return legacy_conversion_step2(latex_file, dpi, output_format)
465 error("No DVI or PDF output. %s failed." \
466 % (os.path.basename(latex)))
468 # Look for PS literals in DVI pages
469 # ps_pages: list of page indexes of pages containing PS literals
470 # page_count: total number of pages
471 # pages_parameter: parameter for dvipng to exclude pages with PostScript
472 (ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
474 # If all pages need PostScript, directly use the legacy method.
475 if len(ps_pages) == page_count:
476 vec = [ script_name, input_path, str(dpi), output_format, fg_color, bg_color, latex ]
477 progress("Using the legacy conversion method (PostScript support)")
478 return legacy_conversion(vec)
480 # Run the dvi file through dvipng.
481 dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
482 % (dvipng, dpi, fg_color_dvipng, bg_color_dvipng, pages_parameter, dvi_file)
483 dvipng_status, dvipng_stdout = run_command(dvipng_call)
486 warning("%s failed to generate images from %s... fallback to legacy method" \
487 % (os.path.basename(dvipng), dvi_file))
488 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
489 progress("Using the legacy conversion method (dvipng failed)")
490 return legacy_conversion_step2(latex_file, dpi, output_format)
492 # Extract metrics info from dvipng_stdout.
493 metrics_file = latex_file_re.sub(".metrics", latex_file)
494 dvipng_metrics = extract_metrics_info(dvipng_stdout)
496 # If some pages require PostScript pass them to legacy method
497 if len(ps_pages) > 0:
498 # Create a new LaTeX file just for the snippets needing
500 legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
501 filter_pages(latex_file, legacy_latex_file, ps_pages)
503 # Pass the new LaTeX file to the legacy method
504 vec = [ script_name, latex_file_re.sub("_legacy.tex", input_path),
505 str(dpi), output_format, fg_color, bg_color, latex ]
506 progress("Pages %s include postscript specials" % ps_pages)
507 progress("Using the legacy conversion method (PostScript support)")
508 legacy_metrics = legacy_conversion(vec, True)[1]
510 # Now we need to mix metrics data from dvipng and the legacy method
511 original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
512 destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
514 # Join metrics from dvipng and legacy, and rename legacy bitmaps
515 join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
516 original_bitmap, destination_bitmap)
518 # Convert images to ppm format if necessary.
519 if output_format == "ppm":
520 convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
522 # Actually create the .metrics file
523 write_metrics_info(dvipng_metrics, metrics_file)
525 return (0, dvipng_metrics)
527 if __name__ == "__main__":
528 exit(main(sys.argv)[0])