src/graphics/GraphicsConverter.C

   1 /**
   2  * \file GraphicsConverter.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Angus Leeming
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "GraphicsConverter.h"
  14
  15 #include "converter.h"
  16 #include "debug.h"
  17 #include "format.h"
  18
  19 #include "support/filetools.h"
  20 #include "support/forkedcallqueue.h"
  21 #include "support/convert.h"
  22 #include "support/lstrings.h"
  23 #include "support/lyxlib.h"
  24
  25 #include <boost/bind.hpp>
  26
  27 #include <sstream>
  28 #include <fstream>
  29
  30 namespace support = lyx::support;
  31
  32 using support::ChangeExtension;
  33 using support::Forkedcall;
  34 using support::ForkedCallQueue;
  35 using support::LibFileSearch;
  36 using support::LibScriptSearch;
  37 using support::OnlyPath;
  38 using support::OnlyFilename;
  39 using support::QuoteName;
  40 using support::subst;
  41 using support::tempName;
  42 using support::unlink;
  43
  44 using std::endl;
  45 using std::ostream;
  46 using std::ostringstream;
  47 using std::string;
  48
  49
  50 namespace lyx {
  51 namespace graphics {
  52
  53 class Converter::Impl : public boost::signals::trackable {
  54 public:
  55         ///
  56         Impl(string const &, string const &, string const &, string const &);
  57
  58         ///
  59         void startConversion();
  60
  61         /** This method is connected to a signal passed to the forked call
  62          *  class, passing control back here when the conversion is completed.
  63          *  Cleans-up the temporary files, emits the finishedConversion
  64          *  signal and removes the Converter from the list of all processes.
  65          */
  66         void converted(pid_t pid, int retval);
  67
  68         /** At the end of the conversion process inform the outside world
  69          *  by emitting a signal.
  70          */
  71         typedef boost::signal<void(bool)> SignalType;
  72         ///
  73         SignalType finishedConversion;
  74
  75         ///
  76         string script_command_;
  77         ///
  78         string script_file_;
  79         ///
  80         string to_file_;
  81         ///
  82         bool valid_process_;
  83         ///
  84         bool finished_;
  85 };
  86
  87
  88 bool Converter::isReachable(string const & from_format_name,
  89                             string const & to_format_name)
  90 {
  91         return converters.isReachable(from_format_name, to_format_name);
  92 }
  93
  94
  95 Converter::Converter(string const & from_file,   string const & to_file_base,
  96                      string const & from_format, string const & to_format)
  97         : pimpl_(new Impl(from_file, to_file_base, from_format, to_format))
  98 {}
  99
 100
 101 // Empty d-tor out-of-line to keep boost::scoped_ptr happy.
 102 Converter::~Converter()
 103 {}
 104
 105
 106 void Converter::startConversion() const
 107 {
 108         pimpl_->startConversion();
 109 }
 110
 111
 112 boost::signals::connection Converter::connect(slot_type const & slot) const
 113 {
 114         return pimpl_->finishedConversion.connect(slot);
 115 }
 116
 117
 118 string const & Converter::convertedFile() const
 119 {
 120         static string const empty;
 121         return pimpl_->finished_ ? pimpl_->to_file_ : empty;
 122 }
 123
 124 } // namespace graphics
 125 } // namespace lyx
 126
 127
 128 //------------------------------
 129 // Implementation details follow
 130 //------------------------------
 131
 132 namespace {
 133
 134 /** Build the conversion script, returning true if able to build it.
 135  *  The script is output to the ostringstream 'script'.
 136  */
 137 bool build_script(string const & from_file, string const & to_file_base,
 138                   string const & from_format, string const & to_format,
 139                   ostream & script);
 140
 141 } // namespace anon
 142
 143
 144 namespace lyx {
 145 namespace graphics {
 146
 147 Converter::Impl::Impl(string const & from_file,   string const & to_file_base,
 148                       string const & from_format, string const & to_format)
 149         : valid_process_(false), finished_(false)
 150 {
 151         lyxerr[Debug::GRAPHICS] << "Converter c-tor:\n"
 152                 << "\tfrom_file:      " << from_file
 153                 << "\n\tto_file_base: " << to_file_base
 154                 << "\n\tfrom_format:  " << from_format
 155                 << "\n\tto_format:    " << to_format << endl;
 156
 157         // The converted image is to be stored in this file (we do not
 158         // use ChangeExtension because this is a basename which may
 159         // nevertheless contain a '.')
 160         to_file_ = to_file_base + '.' +  formats.extension(to_format);
 161
 162         // The conversion commands are stored in a stringstream
 163         ostringstream script;
 164         script << "#!/bin/sh\n";
 165         bool const success = build_script(from_file, to_file_base,
 166                                           from_format, to_format, script);
 167
 168         if (!success) {
 169                 script_command_ =
 170                         "sh " + LibFileSearch("scripts", "convertDefault.sh") +
 171                         ' ' + from_format + ':' + from_file + ' ' +
 172                         to_format + ':' + to_file_;
 173
 174                 lyxerr[Debug::GRAPHICS]
 175                         << "\tNo converter defined! I use convertDefault.sh\n\t"
 176                         << script_command_ << endl;
 177
 178         } else {
 179
 180                 lyxerr[Debug::GRAPHICS] << "\tConversion script:"
 181                         << "\n--------------------------------------\n"
 182                         << script.str()
 183                         << "\n--------------------------------------\n";
 184
 185                 // Output the script to file.
 186                 static int counter = 0;
 187                 script_file_ = OnlyPath(to_file_base) + "lyxconvert" +
 188                         convert<string>(counter++) + ".sh";
 189
 190                 std::ofstream fs(script_file_.c_str());
 191                 if (!fs.good()) {
 192                         lyxerr << "Unable to write the conversion script to \""
 193                                << script_file_ << '\n'
 194                                << "Please check your directory permissions."
 195                                << std::endl;
 196                         return;
 197                 }
 198
 199                 fs << script.str();
 200                 fs.close();
 201
 202                 // The command needed to run the conversion process
 203                 // We create a dummy command for ease of understanding of the
 204                 // list of forked processes.
 205                 // Note: 'sh ' is absolutely essential, or execvp will fail.
 206                 script_command_ = "sh " + script_file_ + ' ' +
 207                         OnlyFilename(from_file) + ' ' + to_format;
 208         }
 209         // All is ready to go
 210         valid_process_ = true;
 211 }
 212
 213
 214 void Converter::Impl::startConversion()
 215 {
 216         if (!valid_process_) {
 217                 converted(0, 1);
 218                 return;
 219         }
 220
 221         Forkedcall::SignalTypePtr
 222                 ptr = ForkedCallQueue::get().add(script_command_);
 223
 224         ptr->connect(boost::bind(&Impl::converted, this, _1, _2));
 225
 226 }
 227
 228 void Converter::Impl::converted(pid_t /* pid */, int retval)
 229 {
 230         if (finished_)
 231                 // We're done already!
 232                 return;
 233
 234         finished_ = true;
 235         // Clean-up behind ourselves
 236         unlink(script_file_);
 237
 238         if (retval > 0) {
 239                 unlink(to_file_);
 240                 to_file_.erase();
 241                 finishedConversion(false);
 242         } else {
 243                 finishedConversion(true);
 244         }
 245 }
 246
 247 } // namespace graphics
 248 } // namespace lyx
 249
 250 namespace {
 251
 252 string const move_file(string const & from_file, string const & to_file)
 253 {
 254         if (from_file == to_file)
 255                 return string();
 256
 257         ostringstream command;
 258         command << "fromfile=" << from_file << "\n"
 259                 << "tofile="   << to_file << "\n\n"
 260                 << "'mv' -f \"${fromfile}\" \"${tofile}\" ||\n"
 261                 << "{\n"
 262                 << "\t'cp' -f \"${fromfile}\" \"${tofile}\" ||\n"
 263                 << "\t{\n"
 264                 << "\t\texit 1\n"
 265                 << "\t}\n"
 266                 << "\t'rm' -f \"${fromfile}\"\n"
 267                 << "}\n";
 268
 269         return command.str();
 270 }
 271
 272
 273 bool build_script(string const & from_file,
 274                   string const & to_file_base,
 275                   string const & from_format,
 276                   string const & to_format,
 277                   ostream & script)
 278 {
 279         lyxerr[Debug::GRAPHICS] << "build_script ... ";
 280         typedef Converters::EdgePath EdgePath;
 281
 282         // we do not use ChangeExtension because this is a basename
 283         // which may nevertheless contain a '.'
 284         string const to_file = to_file_base + '.'
 285                 + formats.extension(to_format);
 286
 287         if (from_format == to_format) {
 288                 script << move_file(QuoteName(from_file), QuoteName(to_file));
 289                 lyxerr[Debug::GRAPHICS] << "ready (from == to)" << endl;
 290                 return true;
 291         }
 292
 293         EdgePath edgepath = converters.getPath(from_format, to_format);
 294
 295         if (edgepath.empty()) {
 296                 lyxerr[Debug::GRAPHICS] << "ready (edgepath.empty())" << endl;
 297                 return false;
 298         }
 299
 300         // Create a temporary base file-name for all intermediate steps.
 301         // Remember to remove the temp file because we only want the name...
 302         static int counter = 0;
 303         string const tmp = "gconvert" + convert<string>(counter++);
 304         string const to_base = tempName(string(), tmp);
 305         unlink(to_base);
 306
 307         string outfile = from_file;
 308
 309         // The conversion commands may contain these tokens that need to be
 310         // changed to infile, infile_base, outfile respectively.
 311         string const token_from("$$i");
 312         string const token_base("$$b");
 313         string const token_to("$$o");
 314
 315         EdgePath::const_iterator it  = edgepath.begin();
 316         EdgePath::const_iterator end = edgepath.end();
 317
 318         for (; it != end; ++it) {
 319                 ::Converter const & conv = converters.get(*it);
 320
 321                 // Build the conversion command
 322                 string const infile      = outfile;
 323                 string const infile_base = ChangeExtension(infile, string());
 324                 outfile = ChangeExtension(to_base, conv.To->extension());
 325
 326                 // Store these names in the shell script
 327                 script << "infile="      << QuoteName(infile) << '\n'
 328                        << "infile_base=" << QuoteName(infile_base) << '\n'
 329                        << "outfile="     << QuoteName(outfile) << '\n';
 330
 331                 string command = conv.command;
 332                 command = subst(command, token_from, "\"${infile}\"");
 333                 command = subst(command, token_base, "\"${infile_base}\"");
 334                 command = subst(command, token_to,   "\"${outfile}\"");
 335                 command = LibScriptSearch(command);
 336
 337                 // Store in the shell script
 338                 script << "\n" << command << " ||\n";
 339
 340                 // Test that this was successful. If not, remove
 341                 // ${outfile} and exit the shell script
 342                 script << "{\n"
 343                        << "\t'rm' -f \"${outfile}\"\n"
 344                        << "\texit 1\n"
 345                        << "}\n\n";
 346
 347                 // Test that the outfile exists.
 348                 // ImageMagick's convert will often create ${outfile}.0,
 349                 // ${outfile}.1.
 350                 // If this occurs, move ${outfile}.0 to ${outfile}
 351                 // and delete ${outfile}.?
 352                 script << "if [ ! -f \"${outfile}\" ]; then\n"
 353                        << "\tif [ -f \"${outfile}\".0 ]; then\n"
 354                        << "\t\t'mv' -f \"${outfile}\".0 \"${outfile}\"\n"
 355                        << "\t\t'rm' -f \"${outfile}\".?\n"
 356                        << "\telse\n"
 357                        << "\t\texit 1\n"
 358                        << "\tfi\n"
 359                        << "fi\n\n";
 360
 361                 // Delete the infile, if it isn't the original, from_file.
 362                 if (infile != from_file) {
 363                         script << "'rm' -f \"${infile}\"\n\n";
 364                 }
 365         }
 366
 367         // Move the final outfile to to_file
 368         script << move_file("\"${outfile}\"", QuoteName(to_file));
 369         lyxerr[Debug::GRAPHICS] << "ready!" << endl;
 370
 371         return true;
 372 }
 373
 374 } // namespace anon