1 # -*- coding: utf-8 -*-
3 # file lyxpreview2bitmap.py
4 # This file is part of LyX, the document processor.
5 # Licence details can be found in the file COPYING.
8 # with much advice from members of the preview-latex project:
9 # David Kastrup, dak@gnu.org and
10 # Jan-Åke Larsson, jalar@mai.liu.se.
12 # Full author contact details are available in file CREDITS
14 # This script takes a LaTeX file and generates a collection of
15 # png or ppm image files, one per previewed snippet.
18 # * python 2.4 or later (subprocess module);
19 # * A latex executable;
23 # * pngtoppm (if outputing ppm format images).
25 # preview.sty and dvipng are part of the preview-latex project
26 # http://preview-latex.sourceforge.net/
28 # preview.sty can alternatively be obtained from
29 # CTAN/support/preview-latex/
32 # lyxpreview2bitmap.py --bg=faf0e6 0lyxpreview.tex
34 # This script takes one obligatory argument:
36 # <input file>: The name of the .tex file to be converted.
38 # and these optional arguments:
40 # --png, --ppm: The desired output format. Either 'png' or 'ppm'.
41 # --dpi=<res>: A scale factor, used to ascertain the resolution of the
42 # generated image which is then passed to gs.
43 # --fg=<color>: The foreground color as a hexadecimal string, eg '000000'.
44 # --bg=<color>: The background color as a hexadecimal string, eg 'faf0e6'.
45 # --latex=<exe>: The converter for latex files. Default is latex.
46 # --bibtex=<exe>: The converter for bibtex files. Default is bibtex.
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 bibtex_commands, copyfileobj, error, \
83 filter_pages, find_exe, find_exe_or_terminate, join_metrics_and_rename, \
84 latex_commands, latex_file_re, make_texcolor, mkstemp, pdflatex_commands, \
85 progress, run_command, run_latex, run_tex, 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 --bibtex=<exe>: Specify the executable for bibtex (default: bibtex)
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 fix_latex_file(latex_file):
158 documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
163 for line in open(latex_file, 'r').readlines():
164 match = documentclass_re.match(line)
170 tmp.write("%s%s\n" % (match.group(1), match.group(3)))
173 copyfileobj(tmp, open(latex_file,"wb"), 1)
178 def convert_to_ppm_format(pngtopnm, basename):
179 png_file_re = re.compile("\.png$")
181 for png_file in glob.glob("%s*.png" % basename):
182 ppm_file = png_file_re.sub(".ppm", png_file)
184 p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
185 p2p_status, p2p_stdout = run_command(p2p_cmd)
187 error("Unable to convert %s to ppm format" % png_file)
189 ppm = open(ppm_file, 'w')
190 ppm.write(p2p_stdout)
193 # Returns a tuple of:
194 # ps_pages: list of page indexes of pages containing PS literals
195 # page_count: total number of pages
196 # pages_parameter: parameter for dvipng to exclude pages with PostScript
197 def find_ps_pages(dvi_file):
199 # FIXME: try with pdflatex
200 if not os.path.isfile(dvi_file):
201 error("No DVI output.")
203 # Check for PostScript specials in the dvi, badly supported by dvipng
204 # This is required for correct rendering of PSTricks and TikZ
205 dv2dt = find_exe_or_terminate(["dv2dt"])
206 dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
208 # The output from dv2dt goes to stdout
209 dv2dt_status, dv2dt_output = run_command(dv2dt_call)
210 psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
212 # Parse the dtl file looking for PostScript specials.
213 # Pages using PostScript specials are recorded in ps_pages and then
214 # used to create a different LaTeX file for processing in legacy mode.
219 for line in dv2dt_output.split("\n"):
221 if line.startswith("bop"):
226 if line.startswith("eop") and page_has_ps:
227 # We save in a list all the PostScript pages
228 ps_pages.append(page_index)
230 if psliteral_re.match(line) != None:
231 # Literal PostScript special detected!
234 # Create the -pp parameter for dvipng
236 if len(ps_pages) > 0 and len(ps_pages) < page_index:
237 # Don't process Postscript pages with dvipng by selecting the
238 # wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
239 pages_parameter = " -pp "
243 # Use page ranges, as a list of pages could exceed command line
244 # maximum length (especially under Win32)
245 for index in xrange(1, page_index + 1):
246 if (not index in ps_pages) and skip:
247 # We were skipping pages but current page shouldn't be skipped.
248 # Add this page to -pp, it could stay alone or become the
250 pages_parameter += str(index)
251 # Save the starting index to avoid things such as "11-11"
253 # We're not skipping anymore
255 elif (index in ps_pages) and (not skip):
256 # We weren't skipping but current page should be skipped
257 if last != index - 1:
258 # If the start index of the range is the previous page
259 # then it's not a range
260 pages_parameter += "-" + str(index - 1)
263 pages_parameter += ","
267 # Remove the trailing separator
268 pages_parameter = pages_parameter.rstrip(",")
269 # We've to manage the case in which the last page is closing a range
270 if (not index in ps_pages) and (not skip) and (last != index):
271 pages_parameter += "-" + str(index)
273 return (ps_pages, page_index, pages_parameter)
284 output_format = "png"
285 script_name = argv[0]
287 # Parse and manipulate the command line arguments.
289 (opts, args) = getopt.gnu_getopt(argv[1:], "dhv", ["bibtex=", "bg=",
290 "debug", "dpi=", "fg=", "help", "latex=", "lilypond",
291 "lilypond-book=", "png", "ppm", "verbose"])
292 except getopt.GetoptError, err:
293 error("%s\n%s" % (err, usage(script_name)))
296 for opt, val in opts:
297 if opt in ("-h", "--help"):
298 print usage(script_name)
300 elif opt == "--bibtex":
304 elif opt in ("-d", "--debug"):
305 import lyxpreview_tools
306 lyxpreview_tools.debug = True
309 dpi = string.atoi(val)
311 error("Cannot convert %s to an integer value" % val)
314 elif opt == "--latex":
316 elif opt == "--lilypond":
318 elif opt == "--lilypond-book":
319 lilypond_book = [val]
320 elif opt in ("--png", "--ppm"):
321 output_format = opt[2:]
322 elif opt in ("-v", "--verbose"):
323 import lyxpreview_tools
324 lyxpreview_tools.verbose = True
326 # Determine input file
328 err = "A single input file is required, %s given" % (len(args) or "none")
329 error("%s\n%s" % (err, usage(script_name)))
332 dir, latex_file = os.path.split(input_path)
335 progress("Starting %s..." % script_name)
336 progress("Output format: %s" % output_format)
337 progress("Foreground color: %s" % fg_color)
338 progress("Background color: %s" % bg_color)
339 progress("Resolution (dpi): %s" % dpi)
340 progress("File to process: %s" % input_path)
342 # Check for the input file
343 if not os.path.exists(input_path):
344 error('File "%s" not found.' % input_path)
348 fg_color_dvipng = make_texcolor(fg_color, False)
349 bg_color_dvipng = make_texcolor(bg_color, False)
351 # External programs used by the script.
352 latex = find_exe_or_terminate(latex or latex_commands)
353 bibtex = find_exe(bibtex or bibtex_commands)
355 lilypond_book = find_exe_or_terminate(lilypond_book or
356 ["lilypond-book --safe"])
358 # These flavors of latex are known to produce pdf output
359 pdf_output = latex in pdflatex_commands
361 progress("Latex command: %s" % latex)
362 progress("Latex produces pdf output: %s" % pdf_output)
363 progress("Bibtex command: %s" % bibtex)
364 progress("Lilypond-book command: %s" % lilypond_book)
365 progress("Preprocess through lilypond-book: %s" % lilypond)
366 progress("Altering the latex file for font size and colors")
368 # Omit font size specification in latex file.
369 fix_latex_file(latex_file)
372 progress("Preprocess the latex file through %s" % lilypond_book)
374 lilypond_book += " --pdf"
375 lilypond_book += " --latex-program=%s" % latex.split()[0]
377 # Make a copy of the latex file
378 lytex_file = latex_file_re.sub(".lytex", latex_file)
379 shutil.copyfile(latex_file, lytex_file)
381 # Preprocess the latex file through lilypond-book.
382 lytex_status, lytex_stdout = run_tex(lilypond_book, lytex_file)
385 progress("Using the legacy conversion method (PDF support)")
386 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
387 bg_color, latex, pdf_output)
389 # This can go once dvipng becomes widespread.
390 dvipng = find_exe(["dvipng"])
392 progress("Using the legacy conversion method (dvipng not found)")
393 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
394 bg_color, latex, pdf_output)
396 dv2dt = find_exe(["dv2dt"])
398 progress("Using the legacy conversion method (dv2dt not found)")
399 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
400 bg_color, latex, pdf_output)
403 if output_format == "ppm":
404 pngtopnm = find_exe(["pngtopnm"])
406 progress("Using the legacy conversion method (pngtopnm not found)")
407 return legacy_conversion_step1(latex_file, dpi, output_format,
408 fg_color, bg_color, latex, pdf_output)
410 # Compile the latex file.
411 latex_status, latex_stdout = run_latex(latex, latex_file, bibtex)
413 return (latex_status, [])
415 # The dvi output file name
416 dvi_file = latex_file_re.sub(".dvi", latex_file)
418 # If there's no DVI output, look for PDF and go to legacy or fail
419 if not os.path.isfile(dvi_file):
420 # No DVI, is there a PDF?
421 pdf_file = latex_file_re.sub(".pdf", latex_file)
422 if os.path.isfile(pdf_file):
423 progress("%s produced a PDF output, fallback to legacy." \
424 % (os.path.basename(latex)))
425 progress("Using the legacy conversion method (PDF support)")
426 return legacy_conversion_step1(latex_file, dpi, output_format,
427 fg_color, bg_color, latex, True)
429 error("No DVI or PDF output. %s failed." \
430 % (os.path.basename(latex)))
432 # Look for PS literals in DVI pages
433 # ps_pages: list of page indexes of pages containing PS literals
434 # page_count: total number of pages
435 # pages_parameter: parameter for dvipng to exclude pages with PostScript
436 (ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
438 # If all pages need PostScript, directly use the legacy method.
439 if len(ps_pages) == page_count:
440 progress("Using the legacy conversion method (PostScript support)")
441 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
442 bg_color, latex, pdf_output)
444 # Run the dvi file through dvipng.
445 dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
446 % (dvipng, dpi, fg_color_dvipng, bg_color_dvipng, pages_parameter, dvi_file)
447 dvipng_status, dvipng_stdout = run_command(dvipng_call)
450 warning("%s failed to generate images from %s... fallback to legacy method" \
451 % (os.path.basename(dvipng), dvi_file))
452 progress("Using the legacy conversion method (dvipng failed)")
453 return legacy_conversion_step1(latex_file, dpi, output_format, fg_color,
454 bg_color, latex, pdf_output)
456 # Extract metrics info from dvipng_stdout.
457 metrics_file = latex_file_re.sub(".metrics", latex_file)
458 dvipng_metrics = extract_metrics_info(dvipng_stdout)
460 # If some pages require PostScript pass them to legacy method
461 if len(ps_pages) > 0:
462 # Create a new LaTeX file just for the snippets needing
464 legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
465 filter_pages(latex_file, legacy_latex_file, ps_pages)
467 # Pass the new LaTeX file to the legacy method
468 progress("Pages %s include postscript specials" % ps_pages)
469 progress("Using the legacy conversion method (PostScript support)")
470 legacy_status, legacy_metrics = legacy_conversion_step1(legacy_latex_file,
471 dpi, output_format, fg_color, bg_color, latex, pdf_output, True)
473 # Now we need to mix metrics data from dvipng and the legacy method
474 original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
475 destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
477 # Join metrics from dvipng and legacy, and rename legacy bitmaps
478 join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
479 original_bitmap, destination_bitmap)
481 # Convert images to ppm format if necessary.
482 if output_format == "ppm":
483 convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
485 # Actually create the .metrics file
486 write_metrics_info(dvipng_metrics, metrics_file)
488 return (0, dvipng_metrics)
490 if __name__ == "__main__":
491 sys.exit(main(sys.argv)[0])