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
71 from lyxpreview_tools import copyfileobj, error, filter_pages, find_exe, \
72 find_exe_or_terminate, join_metrics_and_rename, latex_commands, \
73 latex_file_re, make_texcolor, mkstemp, run_command, warning, \
78 return "Usage: %s <format> <latex file> <dpi> <fg color> <bg color>\n" \
79 "\twhere the colors are hexadecimal strings, eg 'faf0e6'" \
82 # Returns a list of tuples containing page number and ascent fraction
83 # extracted from dvipng output.
84 # Use write_metrics_info to create the .metrics file with this info
85 def extract_metrics_info(dvipng_stdout):
86 # "\[[0-9]+" can match two kinds of numbers: page numbers from dvipng
87 # and glyph numbers from mktexpk. The glyph numbers always match
88 # "\[[0-9]+\]" while the page number never is followed by "\]". Thus:
89 page_re = re.compile("\[([0-9]+)[^]]");
90 metrics_re = re.compile("depth=(-?[0-9]+) height=(-?[0-9]+)")
97 match = page_re.search(dvipng_stdout, pos)
100 page = match.group(1)
102 match = metrics_re.search(dvipng_stdout, pos)
107 # Calculate the 'ascent fraction'.
108 descent = string.atof(match.group(1))
109 ascent = string.atof(match.group(2))
112 if ascent >= 0 or descent >= 0:
113 if abs(ascent + descent) > 0.1:
114 frac = ascent / (ascent + descent)
120 results.append((int(page), frac))
121 pos = match.end() + 2
124 error("Failed to extract metrics info from dvipng")
129 def color_pdf(latex_file, bg_color, fg_color):
130 use_preview_pdf_re = re.compile("(\s*\\\\usepackage\[[^]]+)((pdftex|xetex)\]{preview})")
135 if fg_color != "0.000000,0.000000,0.000000":
136 fg = ' \\AtBeginDocument{\\let\\oldpreview\\preview\\renewcommand\\preview{\\oldpreview\\color[rgb]{%s}}}\n' % (fg_color)
140 for line in open(latex_file, 'r').readlines():
141 match = use_preview_pdf_re.match(line)
146 tmp.write(" \\usepackage{color}\n" \
147 " \\pagecolor[rgb]{%s}\n" \
150 % (bg_color, fg, match.group()))
154 # Unable to open the file, but do nothing here because
155 # the calling function will act on the value of 'success'.
156 warning('Warning in color_pdf! Unable to open "%s"' % latex_file)
157 warning(`sys.exc_type` + ',' + `sys.exc_value`)
160 copyfileobj(tmp, open(latex_file,"wb"), 1)
165 def fix_latex_file(latex_file):
166 documentclass_re = re.compile("(\\\\documentclass\[)(1[012]pt,?)(.+)")
171 for line in open(latex_file, 'r').readlines():
172 match = documentclass_re.match(line)
178 tmp.write("%s%s\n" % (match.group(1), match.group(3)))
181 copyfileobj(tmp, open(latex_file,"wb"), 1)
186 def convert_to_ppm_format(pngtopnm, basename):
187 png_file_re = re.compile("\.png$")
189 for png_file in glob.glob("%s*.png" % basename):
190 ppm_file = png_file_re.sub(".ppm", png_file)
192 p2p_cmd = '%s "%s"' % (pngtopnm, png_file)
193 p2p_status, p2p_stdout = run_command(p2p_cmd)
194 if p2p_status != None:
195 error("Unable to convert %s to ppm format" % png_file)
197 ppm = open(ppm_file, 'w')
198 ppm.write(p2p_stdout)
201 # Returns a tuple of:
202 # ps_pages: list of page indexes of pages containing PS literals
203 # page_count: total number of pages
204 # pages_parameter: parameter for dvipng to exclude pages with PostScript
205 def find_ps_pages(dvi_file):
207 # FIXME: try with pdflatex
208 if not os.path.isfile(dvi_file):
209 error("No DVI output.")
211 # Check for PostScript specials in the dvi, badly supported by dvipng
212 # This is required for correct rendering of PSTricks and TikZ
213 dv2dt = find_exe_or_terminate(["dv2dt"])
214 dv2dt_call = '%s "%s"' % (dv2dt, dvi_file)
216 # The output from dv2dt goes to stdout
217 dv2dt_status, dv2dt_output = run_command(dv2dt_call)
218 psliteral_re = re.compile("^special[1-4] [0-9]+ '(\"|ps:)")
220 # Parse the dtl file looking for PostScript specials.
221 # Pages using PostScript specials are recorded in ps_pages and then
222 # used to create a different LaTeX file for processing in legacy mode.
227 for line in dv2dt_output.split("\n"):
229 if line.startswith("bop"):
234 if line.startswith("eop") and page_has_ps:
235 # We save in a list all the PostScript pages
236 ps_pages.append(page_index)
238 if psliteral_re.match(line) != None:
239 # Literal PostScript special detected!
242 # Create the -pp parameter for dvipng
244 if len(ps_pages) > 0 and len(ps_pages) < page_index:
245 # Don't process Postscript pages with dvipng by selecting the
246 # wanted pages through the -pp parameter. E.g., dvipng -pp 4-12,14,64
247 pages_parameter = " -pp "
251 # Use page ranges, as a list of pages could exceed command line
252 # maximum length (especially under Win32)
253 for index in xrange(1, page_index + 1):
254 if (not index in ps_pages) and skip:
255 # We were skipping pages but current page shouldn't be skipped.
256 # Add this page to -pp, it could stay alone or become the
258 pages_parameter += str(index)
259 # Save the starting index to avoid things such as "11-11"
261 # We're not skipping anymore
263 elif (index in ps_pages) and (not skip):
264 # We weren't skipping but current page should be skipped
265 if last != index - 1:
266 # If the start index of the range is the previous page
267 # then it's not a range
268 pages_parameter += "-" + str(index - 1)
271 pages_parameter += ","
275 # Remove the trailing separator
276 pages_parameter = pages_parameter.rstrip(",")
277 # We've to manage the case in which the last page is closing a range
278 if (not index in ps_pages) and (not skip) and (last != index):
279 pages_parameter += "-" + str(index)
281 return (ps_pages, page_index, pages_parameter)
284 # Parse and manipulate the command line arguments.
285 if len(argv) != 6 and len(argv) != 7:
286 error(usage(argv[0]))
288 script_name = argv[0]
290 output_format = string.lower(argv[1])
293 dir, latex_file = os.path.split(input_path)
297 dpi = string.atoi(argv[3])
301 fg_color_dvipng = make_texcolor(fg_color, False)
302 bg_color_dvipng = make_texcolor(bg_color, False)
304 fg_color_gr = make_texcolor(fg_color, True)
305 bg_color_gr = make_texcolor(bg_color, True)
307 # External programs used by the script.
312 latex = find_exe_or_terminate(latex or latex_commands)
314 # Omit font size specification in latex file.
315 fix_latex_file(latex_file)
317 # This can go once dvipng becomes widespread.
318 dvipng = find_exe(["dvipng"])
320 # The data is input to legacy_conversion in as similar
321 # as possible a manner to that input to the code used in
323 vec = [ script_name, input_path, str(dpi), output_format, fg_color, bg_color, latex ]
324 return legacy_conversion(vec)
327 if output_format == "ppm":
328 pngtopnm = find_exe_or_terminate(["pngtopnm"])
330 # Move color information for PDF into the latex file.
331 if not color_pdf(latex_file, bg_color_gr, fg_color_gr):
332 error("Unable to move color info into the latex file")
334 # Compile the latex file.
335 latex_call = '%s "%s"' % (latex, latex_file)
337 latex_status, latex_stdout = run_command(latex_call)
338 if latex_status != None:
339 warning("%s had problems compiling %s" \
340 % (os.path.basename(latex), latex_file))
342 if latex == "xelatex":
343 warning("Using XeTeX")
344 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
345 return legacy_conversion_step2(latex_file, dpi, output_format)
347 # The dvi output file name
348 dvi_file = latex_file_re.sub(".dvi", latex_file)
350 # If there's no DVI output, look for PDF and go to legacy or fail
351 if not os.path.isfile(dvi_file):
352 # No DVI, is there a PDF?
353 pdf_file = latex_file_re.sub(".pdf", latex_file)
354 if os.path.isfile(pdf_file):
355 warning("%s produced a PDF output, fallback to legacy." % \
356 (os.path.basename(latex)))
357 return legacy_conversion_step2(latex_file, dpi, output_format)
359 error("No DVI or PDF output. %s failed." \
360 % (os.path.basename(latex)))
362 # Look for PS literals in DVI pages
363 # ps_pages: list of page indexes of pages containing PS literals
364 # page_count: total number of pages
365 # pages_parameter: parameter for dvipng to exclude pages with PostScript
366 (ps_pages, page_count, pages_parameter) = find_ps_pages(dvi_file)
368 # If all pages need PostScript, directly use the legacy method.
369 if len(ps_pages) == page_count:
370 vec = [ script_name, input_path, str(dpi), output_format, fg_color, bg_color, latex ]
371 return legacy_conversion(vec)
373 # Run the dvi file through dvipng.
374 dvipng_call = '%s -Ttight -depth -height -D %d -fg "%s" -bg "%s" %s "%s"' \
375 % (dvipng, dpi, fg_color_dvipng, bg_color_dvipng, pages_parameter, dvi_file)
376 dvipng_status, dvipng_stdout = run_command(dvipng_call)
378 if dvipng_status != None:
379 warning("%s failed to generate images from %s... fallback to legacy method" \
380 % (os.path.basename(dvipng), dvi_file))
381 # FIXME: skip unnecessary dvips trial in legacy_conversion_step2
382 return legacy_conversion_step2(latex_file, dpi, output_format)
384 # Extract metrics info from dvipng_stdout.
385 metrics_file = latex_file_re.sub(".metrics", latex_file)
386 dvipng_metrics = extract_metrics_info(dvipng_stdout)
388 # If some pages require PostScript pass them to legacy method
389 if len(ps_pages) > 0:
390 # Create a new LaTeX file just for the snippets needing
392 legacy_latex_file = latex_file_re.sub("_legacy.tex", latex_file)
393 filter_pages(latex_file, legacy_latex_file, ps_pages)
395 # Pass the new LaTeX file to the legacy method
396 vec = [ script_name, latex_file_re.sub("_legacy.tex", input_path),
397 str(dpi), output_format, fg_color, bg_color, latex ]
398 legacy_metrics = legacy_conversion(vec, True)[1]
400 # Now we need to mix metrics data from dvipng and the legacy method
401 original_bitmap = latex_file_re.sub("%d." + output_format, legacy_latex_file)
402 destination_bitmap = latex_file_re.sub("%d." + output_format, latex_file)
404 # Join metrics from dvipng and legacy, and rename legacy bitmaps
405 join_metrics_and_rename(dvipng_metrics, legacy_metrics, ps_pages,
406 original_bitmap, destination_bitmap)
408 # Convert images to ppm format if necessary.
409 if output_format == "ppm":
410 convert_to_ppm_format(pngtopnm, latex_file_re.sub("", latex_file))
412 # Actually create the .metrics file
413 write_metrics_info(dvipng_metrics, metrics_file)
415 return (0, dvipng_metrics)
417 if __name__ == "__main__":
418 exit(main(sys.argv)[0])