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_step1
82 from lyxpreview_tools import copyfileobj, error, filter_pages, find_exe, \
83 find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
84 latex_file_re, make_texcolor, mkstemp, pdflatex_commands, progress, \
85 run_command, warning, write_metrics_info
90 Usage: %s <options> <input file>
93 --dpi=<res>: Resolution per inch (default: 128)
94 --png, --ppm: Select the output format (default: png)
95 --fg=<color>: Foreground color (default: black, ie '000000')
96 --bg=<color>: Background color (default: white, ie 'ffffff')
97 --latex=<exe>: Specify the executable for latex (default: latex)
98 --lilypond: Preprocess through lilypond-book (default: false)
99 --lilypond-book=<exe>:
100 The executable for lilypond-book (default: lilypond-book)
102 -d, --debug: Show the output from external commands
103 -h, --help: Show this help screen and exit
104 -v, --verbose: Show progress messages
106 The colors are hexadecimal strings, eg 'faf0e6'."""
107 return msg % prog_name
109 # Returns a list of tuples containing page number and ascent fraction
110 # extracted from dvipng output.
111 # Use write_metrics_info to create the .metrics file with this info
112 def extract_metrics_info(dvipng_stdout):
113 # "\[[0-9]+" can match two kinds of numbers: page numbers from dvipng
114 # and glyph numbers from mktexpk. The glyph numbers always match
115 # "\[[0-9]+\]" while the page number never is followed by "\]". Thus:
116 page_re = re.compile("\[([0-9]+)[^]]");
117 metrics_re = re.compile("depth=(-?[0-9]+) height=(-?[0-9]+)")
124 match = page_re.search(dvipng_stdout, pos)
127 page = match.group(1)
129 match = metrics_re.search(dvipng_stdout, pos)
134 # Calculate the 'ascent fraction'.
135 descent = string.atof(match.group(1))
136 ascent = string.atof(match.group(2))
139 if ascent >= 0 or descent >= 0:
140 if abs(ascent + descent) > 0.1:
141 frac = ascent / (ascent + descent)
147 results.append((int(page), frac))
148 pos = match.end() + 2
151 error("Failed to extract metrics info from dvipng")
156 def color_pdf(latex_file, bg_color, fg_color):
157 use_preview_pdf_re = re.compile("(\s*\\\\usepackage\[[^]]+)((pdftex|xetex)\]{preview})")
162 if fg_color != "0.000000,0.000000,0.000000":
163 fg = ' \\AtBeginDocument{\\let\\oldpreview\\preview\\renewcommand\\preview{\\oldpreview\\color[rgb]{%s}}}\n' % (fg_color)
167 for line in open(latex_file, 'r').readlines():
168 match = use_preview_pdf_re.match(line)
173 tmp.write(" \\usepackage{color}\n" \
174 " \\pagecolor[rgb]{%s}\n" \
177 % (bg_color, fg, match.group()))
181 # Unable to open the file, but do nothing here because
182 # the calling function will act on the value of 'success'.
183 warning('Warning in color_pdf! Unable to open "%s"' % latex_file)
184 warning(`sys.exc_type` + ',' + `sys.exc_value`)
187 copyfileobj(tmp, open(latex_file,"wb"), 1)
192 def fix_latex_file(latex_file):
193 documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
198 for line in open(latex_file, 'r').readlines():
199 match = documentclass_re.match(line)
205 tmp.write("%s%s\n" % (match.group(1), match.group(3)))
208 copyfileobj(tmp, open(latex_file,"wb"), 1)
213 def convert_to_ppm_format(pngtopnm, basename):
214 png_file_re = re.compile("\.png$")
216 for png_file in glob.glob("%s*.png" % basename):
217 ppm_file = png_file_re.sub(".ppm", png_file)
219 p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
220 p2p_status, p2p_stdout = run_command(p2p_cmd)
222 error("Unable to convert %s to ppm format" % png_file)
224 ppm = open(ppm_file, 'w')
225 ppm.write(p2p_stdout)
228 # Returns a tuple of:
229 # ps_pages: list of page indexes of pages containing PS literals
230 # page_count: total number of pages
231 # pages_parameter: parameter for dvipng to exclude pages with PostScript
232 def find_ps_pages(dvi_file):
234 # FIXME: try with pdflatex
235 if not os.path.isfile(dvi_file):
236 error("No DVI output.")
238 # Check for PostScript specials in the dvi, badly supported by dvipng
239 # This is required for correct rendering of PSTricks and TikZ
240 dv2dt = find_exe_or_terminate(["dv2dt"])
241 dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
243 # The output from dv2dt goes to stdout
244 dv2dt_status, dv2dt_output = run_command(dv2dt_call)
245 psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
247 # Parse the dtl file looking for PostScript specials.
248 # Pages using PostScript specials are recorded in ps_pages and then
249 # used to create a different LaTeX file for processing in legacy mode.
254 for line in dv2dt_output.split("\n"):
256 if line.startswith("bop"):
261 if line.startswith("eop") and page_has_ps:
262 # We save in a list all the PostScript pages
263 ps_pages.append(page_index)
265 if psliteral_re.match(line) != None:
266 # Literal PostScript special detected!
269 # Create the -pp parameter for dvipng
271 if len(ps_pages) > 0 and len(ps_pages) < page_index:
272 # Don't process Postscript pages with dvipng by selecting the
273 # wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
274 pages_parameter = " -pp "
278 # Use page ranges, as a list of pages could exceed command line
279 # maximum length (especially under Win32)
280 for index in xrange(1, page_index + 1):
281 if (not index in ps_pages) and skip:
282 # We were skipping pages but current page shouldn't be skipped.
283 # Add this page to -pp, it could stay alone or become the
285 pages_parameter += str(index)
286 # Save the starting index to avoid things such as "11-11"
288 # We're not skipping anymore
290 elif (index in ps_pages) and (not skip):
291 # We weren't skipping but current page should be skipped
292 if last != index - 1:
293 # If the start index of the range is the previous page
294 # then it's not a range
295 pages_parameter += "-" + str(index - 1)
298 pages_parameter += ","
302 # Remove the trailing separator
303 pages_parameter = pages_parameter.rstrip(",")
304 # We've to manage the case in which the last page is closing a range
305 if (not index in ps_pages) and (not skip) and (last != index):
306 pages_parameter += "-" + str(index)
308 return (ps_pages, page_index, pages_parameter)
318 output_format = "png"
319 script_name = argv[0]
321 # Parse and manipulate the command line arguments.
323 (opts, args) = getopt.gnu_getopt(argv[1:], "dhv", ["bg=", "debug",
324 "dpi=", "fg=", "help", "latex=", "lilypond", "lilypond-book=",
325 "png", "ppm", "verbose"])
326 except getopt.GetoptError, err:
327 error("%s\n%s" % (err, usage(script_name)))
330 for opt, val in opts:
331 if opt in ("-h", "--help"):
332 print usage(script_name)
336 elif opt in ("-d", "--debug"):
337 import lyxpreview_tools
338 lyxpreview_tools.debug = True
341 dpi = string.atoi(val)
343 error("Cannot convert %s to an integer value" % val)
346 elif opt == "--latex":
348 elif opt == "--lilypond":
350 elif opt == "--lilypond-book":
351 lilypond_book = [val]
352 elif opt in ("--png", "--ppm"):
353 output_format = opt[2:]
354 elif opt in ("-v", "--verbose"):
355 import lyxpreview_tools
356 lyxpreview_tools.verbose = True
358 # Determine input file
360 err = "A single input file is required, %s given" % (len(args) or "none")
361 error("%s\n%s" % (err, usage(script_name)))
364 dir, latex_file = os.path.split(input_path)
367 progress("Starting %s..." % script_name)
368 progress("Output format: %s" % output_format)
369 progress("Foreground color: %s" % fg_color)
370 progress("Background color: %s" % bg_color)
371 progress("Resolution (dpi): %s" % dpi)
372 progress("File to process: %s" % input_path)
374 # Check for the input file
375 if not os.path.exists(input_path):
376 error('File "%s" not found.' % input_path)
380 fg_color_dvipng = make_texcolor(fg_color, False)
381 bg_color_dvipng = make_texcolor(bg_color, False)
383 fg_color_gr = make_texcolor(fg_color, True)
384 bg_color_gr = make_texcolor(bg_color, True)
386 # External programs used by the script.
387 latex = find_exe_or_terminate(latex or latex_commands)
389 lilypond_book = find_exe_or_terminate(lilypond_book or ["lilypond-book"])
391 # These flavors of latex are known to produce pdf output
392 pdf_output = latex in pdflatex_commands
394 progress("Latex command: %s" % latex)
395 progress("Latex produces pdf output: %s" % pdf_output)
396 progress("Lilypond-book command: %s" % lilypond_book)
397 progress("Preprocess through lilypond-book: %s" % lilypond)
398 progress("Altering the latex file for font size and colors")
400 # Omit font size specification in latex file.
401 if not fix_latex_file(latex_file):
402 warning("Unable to remove font size from the latex file")
405 progress("Preprocess the latex file through %s" % lilypond_book)
407 lilypond_book += ' --pdf'
409 # Make a copy of the latex file
410 lytex_file = latex_file_re.sub(".lytex", latex_file)
411 shutil.copyfile(latex_file, lytex_file)
413 # Preprocess the latex file through lilypond-book.
414 lytex_call = '%s --safe --latex-program=%s "%s"' % (lilypond_book,
416 lytex_status, lytex_stdout = run_command(lytex_call)
418 warning("%s failed to compile %s" \
419 % (os.path.basename(lilypond_book), lytex_file))
422 progress("Using the legacy conversion method (PDF support)")
423 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
424 bg_color, latex, pdf_output)
426 # This can go once dvipng becomes widespread.
427 dvipng = find_exe(["dvipng"])
429 progress("Using the legacy conversion method (dvipng not found)")
430 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
431 bg_color, latex, pdf_output)
433 dv2dt = find_exe(["dv2dt"])
435 progress("Using the legacy conversion method (dv2dt not found)")
436 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
437 bg_color, latex, pdf_output)
440 if output_format == "ppm":
441 pngtopnm = find_exe(["pngtopnm"])
443 progress("Using the legacy conversion method (pngtopnm not found)")
444 return legacy_conversion_step1(latex_file, dpi, output_format,
445 fg_color, bg_color, latex, pdf_output)
447 # Move color information for PDF into the latex file.
448 if not color_pdf(latex_file, bg_color_gr, fg_color_gr):
449 warning("Unable to move color info into the latex file")
451 # Compile the latex file.
452 latex_call = '%s "%s"' % (latex, latex_file)
454 latex_status, latex_stdout = run_command(latex_call)
456 warning("%s had problems compiling %s" \
457 % (os.path.basename(latex), latex_file))
459 # The dvi output file name
460 dvi_file = latex_file_re.sub(".dvi", latex_file)
462 # If there's no DVI output, look for PDF and go to legacy or fail
463 if not os.path.isfile(dvi_file):
464 # No DVI, is there a PDF?
465 pdf_file = latex_file_re.sub(".pdf", latex_file)
466 if os.path.isfile(pdf_file):
467 progress("%s produced a PDF output, fallback to legacy." \
468 % (os.path.basename(latex)))
469 progress("Using the legacy conversion method (PDF support)")
470 return legacy_conversion_step1(latex_file, dpi, output_format,
471 fg_color, bg_color, latex, True)
473 error("No DVI or PDF output. %s failed." \
474 % (os.path.basename(latex)))
476 # Look for PS literals in DVI pages
477 # ps_pages: list of page indexes of pages containing PS literals
478 # page_count: total number of pages
479 # pages_parameter: parameter for dvipng to exclude pages with PostScript
480 (ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
482 # If all pages need PostScript, directly use the legacy method.
483 if len(ps_pages) == page_count:
484 progress("Using the legacy conversion method (PostScript support)")
485 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
486 bg_color, latex, pdf_output)
488 # Run the dvi file through dvipng.
489 dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
490 % (dvipng, dpi, fg_color_dvipng, bg_color_dvipng, pages_parameter, dvi_file)
491 dvipng_status, dvipng_stdout = run_command(dvipng_call)
494 warning("%s failed to generate images from %s... fallback to legacy method" \
495 % (os.path.basename(dvipng), dvi_file))
496 progress("Using the legacy conversion method (dvipng failed)")
497 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
498 bg_color, latex, pdf_output)
500 # Extract metrics info from dvipng_stdout.
501 metrics_file = latex_file_re.sub(".metrics", latex_file)
502 dvipng_metrics = extract_metrics_info(dvipng_stdout)
504 # If some pages require PostScript pass them to legacy method
505 if len(ps_pages) > 0:
506 # Create a new LaTeX file just for the snippets needing
508 legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
509 filter_pages(latex_file, legacy_latex_file, ps_pages)
511 # Pass the new LaTeX file to the legacy method
512 progress("Pages %s include postscript specials" % ps_pages)
513 progress("Using the legacy conversion method (PostScript support)")
514 legacy_status, legacy_metrics = legacy_conversion_step1(legacy_latex_file,
515 dpi, output_format, fg_color, bg_color, latex, pdf_output, True)
517 # Now we need to mix metrics data from dvipng and the legacy method
518 original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
519 destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
521 # Join metrics from dvipng and legacy, and rename legacy bitmaps
522 join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
523 original_bitmap, destination_bitmap)
525 # Convert images to ppm format if necessary.
526 if output_format == "ppm":
527 convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
529 # Actually create the .metrics file
530 write_metrics_info(dvipng_metrics, metrics_file)
532 return (0, dvipng_metrics)
534 if __name__ == "__main__":
535 exit(main(sys.argv)[0])