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 # * 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 png 0lyxpreview.tex 128 000000 faf0e6
34 # This script takes six arguments:
35 # FORMAT: The desired output format. Either 'png' or 'ppm'.
36 # TEXFILE: the name of the .tex file to be converted.
37 # DPI: a scale factor, used to ascertain the resolution of the
38 # generated image which is then passed to gs.
39 # FG_COLOR: the foreground color as a hexadecimal string, eg '000000'.
40 # BG_COLOR: the background color as a hexadecimal string, eg 'faf0e6'.
41 # CONVERTER: the converter (optional). Default is latex.
43 # Decomposing TEXFILE's name as DIR/BASE.tex, this script will,
44 # if executed successfully, leave in DIR:
45 # * a (possibly large) number of image files with names
47 # * a file BASE.metrics, containing info needed by LyX to position
48 # the images correctly on the screen.
50 # What does this script do?
51 # 1) Call latex/pdflatex/xelatex/whatever (CONVERTER parameter)
52 # 2) If the output is a PDF fallback to legacy
53 # 3) Otherwise check each page of the DVI (with dv2dt) looking for
54 # PostScript literals, not well supported by dvipng. Pages
55 # containing them are passed to the legacy method in a new LaTeX file.
56 # 4) Call dvipng on the pages without PS literals
57 # 5) Join metrics info coming from both methods (legacy and dvipng)
58 # and write them to file
60 # dvipng is fast but gives problem in several cases, like with
61 # PSTricks, TikZ and other packages using PostScript literals
62 # for all these cases the legacy route is taken (step 3).
63 # Moreover dvipng can't work with PDF files, so, if the CONVERTER
64 # paramter is pdflatex we have to fallback to legacy route (step 2).
66 import glob, os, re, string, sys
68 from legacy_lyxpreview2ppm import legacy_conversion, \
69 legacy_conversion_step2, legacy_extract_metrics_info, filter_pages
71 from lyxpreview_tools import copyfileobj, error, find_exe, \
72 find_exe_or_terminate, make_texcolor, mkstemp, run_command, warning, \
73 write_metrics_info, join_metrics_and_rename
76 # Pre-compiled regular expressions.
77 latex_file_re = re.compile("\.tex$")
79 # PATH environment variable
80 path = string.split(os.environ["PATH"], os.pathsep)
83 return "Usage: %s <format> <latex file> <dpi> <fg color> <bg color>\n"\
84 "\twhere the colors are hexadecimal strings, eg 'faf0e6'"\
87 # Returns a list of tuples containing page number and ascent fraction
88 # extracted from dvipng output.
89 # Use write_metrics_info to create the .metrics file with this info
90 def extract_metrics_info(dvipng_stdout):
91 # "\[[0-9]+" can match two kinds of numbers: page numbers from dvipng
92 # and glyph numbers from mktexpk. The glyph numbers always match
93 # "\[[0-9]+\]" while the page number never is followed by "\]". Thus:
94 page_re = re.compile("\[([0-9]+)[^]]");
95 metrics_re = re.compile("depth=(-?[0-9]+) height=(-?[0-9]+)")
102 match = page_re.search(dvipng_stdout, pos)
105 page = match.group(1)
107 match = metrics_re.search(dvipng_stdout, pos)
112 # Calculate the 'ascent fraction'.
113 descent = string.atof(match.group(1))
114 ascent = string.atof(match.group(2))
117 if ascent >= 0 or descent >= 0:
118 if abs(ascent + descent) > 0.1:
119 frac = ascent / (ascent + descent)
125 results.append((int(page), frac))
126 pos = match.end() + 2
129 error("Failed to extract metrics info from dvipng")
134 def color_pdf(latex_file, bg_color, fg_color):
135 use_preview_pdf_re = re.compile("(\s*\\\\usepackage\[[^]]+)((pdftex|xetex)\]{preview})")
140 if fg_color != "0.000000,0.000000,0.000000":
141 fg = ' \\AtBeginDocument{\\let\\oldpreview\\preview\\renewcommand\\preview{\\oldpreview\\color[rgb]{%s}}}\n' % (fg_color)
145 for line in open(latex_file, 'r').readlines():
146 match = use_preview_pdf_re.match(line)
151 tmp.write(" \\usepackage{color}\n" \
152 " \\pagecolor[rgb]{%s}\n" \
155 % (bg_color, fg, match.group()))
159 # Unable to open the file, but do nothing here because
160 # the calling function will act on the value of 'success'.
161 warning('Warning in color_pdf! Unable to open "%s"' % latex_file)
162 warning(`sys.exc_type` + ',' + `sys.exc_value`)
165 copyfileobj(tmp, open(latex_file,"wb"), 1)
170 def fix_latex_file(latex_file):
171 documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
176 for line in open(latex_file, 'r').readlines():
177 match = documentclass_re.match(line)
183 tmp.write("%s%s\n" % (match.group(1), match.group(3)))
186 copyfileobj(tmp, open(latex_file,"wb"), 1)
191 def convert_to_ppm_format(pngtopnm, basename):
192 png_file_re = re.compile("\.png$")
194 for png_file in glob.glob("%s*.png" % basename):
195 ppm_file = png_file_re.sub(".ppm", png_file)
197 p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
198 p2p_status, p2p_stdout = run_command(p2p_cmd)
199 if p2p_status != None:
200 error("Unable to convert %s to ppm format" % png_file)
202 ppm = open(ppm_file, 'w')
203 ppm.write(p2p_stdout)
206 # Returns a tuple of:
207 # ps_pages: list of page indexes of pages containing PS literals
208 # page_count: total number of pages
209 # pages_parameter: parameter for dvipng to exclude pages with PostScript
210 def find_ps_pages(dvi_file):
212 # FIXME: try with pdflatex
213 if not os.path.isfile(dvi_file):
214 error("No DVI output.")
216 # Check for PostScript specials in the dvi, badly supported by dvipng
217 # This is required for correct rendering of PSTricks and TikZ
218 dv2dt = find_exe_or_terminate(["dv2dt"], path)
219 dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
221 # The output from dv2dt goes to stdout
222 dv2dt_status, dv2dt_output = run_command(dv2dt_call)
223 psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
225 # Parse the dtl file looking for PostScript specials.
226 # Pages using PostScript specials are recorded in ps_pages and then
227 # used to create a different LaTeX file for processing in legacy mode.
232 for line in dv2dt_output.split("\n"):
234 if line.startswith("bop"):
239 if line.startswith("eop") and page_has_ps:
240 # We save in a list all the PostScript pages
241 ps_pages.append(page_index)
243 if psliteral_re.match(line) != None:
244 # Literal PostScript special detected!
247 # Create the -pp parameter for dvipng
249 if len(ps_pages) > 0 and len(ps_pages) < page_index:
250 # Don't process Postscript pages with dvipng by selecting the
251 # wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
252 pages_parameter = " -pp "
256 # Use page ranges, as a list of pages could exceed command line
257 # maximum length (especially under Win32)
258 for index in xrange(1, page_index + 1):
259 if (not index in ps_pages) and skip:
260 # We were skipping pages but current page shouldn't be skipped.
261 # Add this page to -pp, it could stay alone or become the
263 pages_parameter += str(index)
264 # Save the starting index to avoid things such as "11-11"
266 # We're not skipping anymore
268 elif (index in ps_pages) and (not skip):
269 # We weren't skipping but current page should be skipped
270 if last != index - 1:
271 # If the start index of the range is the previous page
272 # then it's not a range
273 pages_parameter += "-" + str(index - 1)
276 pages_parameter += ","
280 # Remove the trailing separator
281 pages_parameter = pages_parameter.rstrip(",")
282 # We've to manage the case in which the last page is closing a range
283 if (not index in ps_pages) and (not skip) and (last != index):
284 pages_parameter += "-" + str(index)
286 return (ps_pages, page_index, pages_parameter)
289 # Parse and manipulate the command line arguments.
290 if len(argv) != 6 and len(argv) != 7:
291 error(usage(argv[0]))
293 output_format = string.lower(argv[1])
295 dir, latex_file = os.path.split(argv[2])
299 dpi = string.atoi(argv[3])
300 fg_color = make_texcolor(argv[4], False)
301 bg_color = make_texcolor(argv[5], False)
303 fg_color_gr = make_texcolor(argv[4], True)
304 bg_color_gr = make_texcolor(argv[5], True)
306 # External programs used by the script.
310 latex = find_exe_or_terminate(["latex", "pplatex", "platex", "latex2e"], path)
312 # Omit font size specification in latex file.
313 fix_latex_file(latex_file)
315 # This can go once dvipng becomes widespread.
316 dvipng = find_exe(["dvipng"], path)
318 # The data is input to legacy_conversion in as similar
319 # as possible a manner to that input to the code used in
321 vec = [ argv[0], argv[2], argv[3], argv[1], argv[4], argv[5], latex ]
322 return legacy_conversion(vec)
325 if output_format == "ppm":
326 pngtopnm = find_exe_or_terminate(["pngtopnm"], path)
328 # Move color information for PDF into the latex file.
329 if not color_pdf(latex_file, bg_color_gr, fg_color_gr):
330 error("Unable to move color info into the latex file")
332 # Compile the latex file.
333 latex_call = '%s "%s"' % (latex, latex_file)
335 latex_status, latex_stdout = run_command(latex_call)
336 if latex_status != None:
337 warning("%s had problems compiling %s" \
338 % (os.path.basename(latex), latex_file))
340 if latex == "xelatex":
341 warning("Using XeTeX")
342 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
343 return legacy_conversion_step2(latex_file, dpi, output_format)
345 # The dvi output file name
346 dvi_file = latex_file_re.sub(".dvi", latex_file)
348 # If there's no DVI output, look for PDF and go to legacy or fail
349 if not os.path.isfile(dvi_file):
350 # No DVI, is there a PDF?
351 pdf_file = latex_file_re.sub(".pdf", latex_file)
352 if os.path.isfile(pdf_file):
353 warning("%s produced a PDF output, fallback to legacy." % \
354 (os.path.basename(latex)))
355 return legacy_conversion_step2(latex_file, dpi, output_format)
357 error("No DVI or PDF output. %s failed." \
358 % (os.path.basename(latex)))
360 # Look for PS literals in DVI pages
361 # ps_pages: list of page indexes of pages containing PS literals
362 # page_count: total number of pages
363 # pages_parameter: parameter for dvipng to exclude pages with PostScript
364 (ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
366 # If all pages need PostScript, directly use the legacy method.
367 if len(ps_pages) == page_count:
368 vec = [argv[0], argv[2], argv[3], argv[1], argv[4], argv[5], latex]
369 return legacy_conversion(vec)
371 # Run the dvi file through dvipng.
372 dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
373 % (dvipng, dpi, fg_color, bg_color, pages_parameter, dvi_file)
374 dvipng_status, dvipng_stdout = run_command(dvipng_call)
376 if dvipng_status != None:
377 warning("%s failed to generate images from %s... fallback to legacy method" \
378 % (os.path.basename(dvipng), dvi_file))
379 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
380 return legacy_conversion_step2(latex_file, dpi, output_format)
382 # Extract metrics info from dvipng_stdout.
383 metrics_file = latex_file_re.sub(".metrics", latex_file)
384 dvipng_metrics = extract_metrics_info(dvipng_stdout)
386 # If some pages require PostScript pass them to legacy method
387 if len(ps_pages) > 0:
388 # Create a new LaTeX file just for the snippets needing
390 legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
391 filter_pages(latex_file, legacy_latex_file, ps_pages)
393 # Pass the new LaTeX file to the legacy method
394 vec = [ argv[0], latex_file_re.sub("_legacy.tex", argv[2]), \
395 argv[3], argv[1], argv[4], argv[5], latex ]
396 legacy_metrics = legacy_conversion(vec, True)[1]
398 # Now we need to mix metrics data from dvipng and the legacy method
399 original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
400 destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
402 # Join metrics from dvipng and legacy, and rename legacy bitmaps
403 join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
404 original_bitmap, destination_bitmap)
406 # Convert images to ppm format if necessary.
407 if output_format == "ppm":
408 convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
410 # Actually create the .metrics file
411 write_metrics_info(dvipng_metrics, metrics_file)
413 return (0, dvipng_metrics)
415 if __name__ == "__main__":
416 exit(main(sys.argv)[0])