2 * \file GraphicsConverter.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Angus Leeming
8 * Full author contact details are available in file CREDITS.
13 #include "GraphicsConverter.h"
15 #include "Converter.h"
18 #include "support/lassert.h"
19 #include "support/convert.h"
20 #include "support/debug.h"
21 #include "support/FileName.h"
22 #include "support/filetools.h"
23 #include "support/ForkedCalls.h"
24 #include "support/lstrings.h"
25 #include "support/os.h"
27 #include "support/bind.h"
33 using namespace lyx::support;
39 class Converter::Impl : public boost::signals::trackable {
42 Impl(FileName const &, string const &, string const &, string const &);
45 void startConversion();
47 /** This method is connected to a signal passed to the forked call
48 * class, passing control back here when the conversion is completed.
49 * Cleans-up the temporary files, emits the finishedConversion
50 * signal and removes the Converter from the list of all processes.
52 void converted(pid_t pid, int retval);
54 /** At the end of the conversion process inform the outside world
55 * by emitting a signal.
57 typedef boost::signal<void(bool)> SignalType;
59 SignalType finishedConversion;
62 string script_command_;
64 FileName script_file_;
74 bool Converter::isReachable(string const & from_format_name,
75 string const & to_format_name)
77 return theConverters().isReachable(from_format_name, to_format_name);
81 Converter::Converter(FileName const & from_file, string const & to_file_base,
82 string const & from_format, string const & to_format)
83 : pimpl_(new Impl(from_file, to_file_base, from_format, to_format))
87 Converter::~Converter()
93 void Converter::startConversion() const
95 pimpl_->startConversion();
99 boost::signals::connection Converter::connect(slot_type const & slot) const
101 return pimpl_->finishedConversion.connect(slot);
105 FileName const & Converter::convertedFile() const
107 static FileName const empty;
108 return pimpl_->finished_ ? pimpl_->to_file_ : empty;
111 /** Build the conversion script.
112 * The script is output to the stream \p script.
114 static void build_script(string const & from_file, string const & to_file_base,
115 string const & from_format, string const & to_format,
119 Converter::Impl::Impl(FileName const & from_file, string const & to_file_base,
120 string const & from_format, string const & to_format)
121 : valid_process_(false), finished_(false)
123 LYXERR(Debug::GRAPHICS, "Converter c-tor:\n"
124 << "\tfrom_file: " << from_file
125 << "\n\tto_file_base: " << to_file_base
126 << "\n\tfrom_format: " << from_format
127 << "\n\tto_format: " << to_format);
129 // The converted image is to be stored in this file (we do not
130 // use ChangeExtension because this is a basename which may
131 // nevertheless contain a '.')
132 to_file_ = FileName(to_file_base + '.' + formats.extension(to_format));
134 // The conversion commands are stored in a stringstream
135 ostringstream script;
136 build_script(from_file.toFilesystemEncoding(),
137 to_file_.toFilesystemEncoding(),
138 from_format, to_format, script);
139 LYXERR(Debug::GRAPHICS, "\tConversion script:"
140 "\n--------------------------------------\n"
142 << "\n--------------------------------------\n");
144 // Output the script to file.
146 static int counter = 0;
147 script_file_ = FileName(onlyPath(to_file_base) + "lyxconvert" +
148 convert<string>(counter++) + ".py");
150 ofstream fs(script_file_.toFilesystemEncoding().c_str());
152 lyxerr << "Unable to write the conversion script to \""
153 << script_file_ << '\n'
154 << "Please check your directory permissions."
162 // The command needed to run the conversion process
163 // We create a dummy command for ease of understanding of the
164 // list of forked processes.
165 // Note: 'python ' is absolutely essential, or execvp will fail.
166 script_command_ = os::python() + ' ' +
167 quoteName(script_file_.toFilesystemEncoding()) + ' ' +
168 quoteName(onlyFileName(from_file.toFilesystemEncoding())) + ' ' +
169 quoteName(to_format);
170 // All is ready to go
171 valid_process_ = true;
175 void Converter::Impl::startConversion()
177 if (!valid_process_) {
182 ForkedCall::SignalTypePtr ptr =
183 ForkedCallQueue::add(script_command_);
184 ptr->connect(bind(&Impl::converted, this, _1, _2));
188 void Converter::Impl::converted(pid_t /* pid */, int retval)
191 // We're done already!
195 // Clean-up behind ourselves
196 script_file_.removeFile();
199 to_file_.removeFile();
201 finishedConversion(false);
203 finishedConversion(true);
208 static string const move_file(string const & from_file, string const & to_file)
210 if (from_file == to_file)
213 ostringstream command;
214 command << "fromfile = " << from_file << "\n"
215 << "tofile = " << to_file << "\n\n"
217 << " os.rename(fromfile, tofile)\n"
220 << " shutil.copy(fromfile, tofile)\n"
223 << " unlinkNoThrow(fromfile)\n";
225 return command.str();
229 static void build_conversion_command(string const & command, ostream & script)
231 // Store in the python script
232 script << "\nif os.system(r'" << command << "') != 0:\n";
234 // Test that this was successful. If not, remove
235 // ${outfile} and exit the python script
236 script << " unlinkNoThrow(outfile)\n"
237 << " sys.exit(1)\n\n";
239 // Test that the outfile exists.
240 // ImageMagick's convert will often create ${outfile}.0,
242 // If this occurs, move ${outfile}.0 to ${outfile}
243 // and delete ${outfile}.? (ignore errors)
244 script << "if not os.path.isfile(outfile):\n"
245 " if os.path.isfile(outfile + '.0'):\n"
246 " os.rename(outfile + '.0', outfile)\n"
248 " for file in glob.glob(outfile + '.?'):\n"
249 " unlinkNoThrow(file)\n"
254 script << "if infile != outfile:\n"
255 " unlinkNoThrow(infile)\n\n";
259 static string const strip_digit(string const & format)
261 // Strip trailing digits from format names e.g. "pdf6" -> "pdf"
262 return format.substr(0, format.find_last_not_of("0123456789") + 1);
266 static void build_script(string const & from_file,
267 string const & to_file,
268 string const & from_format,
269 string const & to_format,
272 LASSERT(from_format != to_format, return);
273 LYXERR(Debug::GRAPHICS, "build_script ... ");
274 typedef Graph::EdgePath EdgePath;
276 script << "#!/usr/bin/env python\n"
277 "# -*- coding: utf-8 -*-\n"
278 "import os, shutil, sys\n\n"
279 "def unlinkNoThrow(file):\n"
280 " ''' remove a file, do not throw if an error occurs '''\n"
286 EdgePath const edgepath = from_format.empty() ?
288 theConverters().getPath(from_format, to_format);
290 // Create a temporary base file-name for all intermediate steps.
291 // Remember to remove the temp file because we only want the name...
293 static int counter = 0;
294 string const tmp = "gconvert" + convert<string>(counter++);
295 string const to_base = FileName::tempName(tmp).toFilesystemEncoding();
297 // Create a copy of the file in case the original name contains
298 // problematic characters like ' or ". We can work around that problem
299 // in python, but the converters might be shell scripts and have more
301 string outfile = addExtension(to_base, getExtension(from_file));
302 script << "infile = "
303 << quoteName(from_file, quote_python)
306 << quoteName(outfile, quote_python) << "\n"
307 "shutil.copy(infile, outfile)\n";
309 // Some converters (e.g. lilypond) can only output files to the
310 // current directory, so we need to change the current directory.
311 // This has the added benefit that all other files that may be
312 // generated by the converter are deleted when LyX closes and do not
313 // clutter the real working directory.
314 script << "os.chdir("
315 << quoteName(onlyPath(outfile)) << ")\n";
317 if (edgepath.empty()) {
318 // Either from_format is unknown or we don't have a
319 // converter path from from_format to to_format, so we use
320 // the default converter.
321 script << "infile = outfile\n"
323 << quoteName(to_file, quote_python) << "\n";
326 os << os::python() << ' '
327 << libScriptSearch("$$s/scripts/convertDefault.py",
328 quote_python) << ' ';
329 if (!from_format.empty())
330 os << strip_digit(from_format) << ':';
331 // The extra " quotes around infile and outfile are needed
332 // because the filename may contain spaces and it is used
333 // as argument of os.system().
334 os << "' + '\"' + infile + '\"' + ' "
335 << strip_digit(to_format) << ":' + '\"' + outfile + '\"' + '";
336 string const command = os.str();
338 LYXERR(Debug::GRAPHICS,
339 "\tNo converter defined! I use convertDefault.py\n\t"
342 build_conversion_command(command, script);
345 // The conversion commands may contain these tokens that need to be
346 // changed to infile, infile_base, outfile and output directory respectively.
347 string const token_from = "$$i";
348 string const token_base = "$$b";
349 string const token_to = "$$o";
350 string const token_todir = "$$d";
352 EdgePath::const_iterator it = edgepath.begin();
353 EdgePath::const_iterator end = edgepath.end();
355 for (; it != end; ++it) {
356 lyx::Converter const & conv = theConverters().get(*it);
358 // Build the conversion command
359 string const infile = outfile;
360 string const infile_base = changeExtension(infile, string());
361 outfile = conv.result_file.empty()
362 ? addExtension(to_base, conv.To->extension())
363 : addName(subst(conv.result_dir,
364 token_base, infile_base),
365 subst(conv.result_file,
366 token_base, onlyFileName(infile_base)));
368 // If two formats share the same extension we may get identical names
369 if (outfile == infile && conv.result_file.empty()) {
370 string const new_base = FileName::tempName(tmp).toFilesystemEncoding();
371 outfile = addExtension(new_base, conv.To->extension());
374 // Store these names in the python script
375 script << "infile = "
376 << quoteName(infile, quote_python) << "\n"
378 << quoteName(infile_base, quote_python) << "\n"
380 << quoteName(outfile, quote_python) << "\n"
381 "outdir = os.path.dirname(outfile)\n" ;
383 // See comment about extra " quotes above (although that
384 // applies only for the first loop run here).
385 string command = conv.command;
386 command = subst(command, token_from, "' + '\"' + infile + '\"' + '");
387 command = subst(command, token_base, "' + '\"' + infile_base + '\"' + '");
388 command = subst(command, token_to, "' + '\"' + outfile + '\"' + '");
389 command = subst(command, token_todir, "' + '\"' + outdir + '\"' + '");
390 command = libScriptSearch(command, quote_python);
392 build_conversion_command(command, script);
395 // Move the final outfile to to_file
396 script << move_file("outfile", quoteName(to_file, quote_python));
397 LYXERR(Debug::GRAPHICS, "ready!");
400 } // namespace graphics