src/graphics/GraphicsConverter.C

   1 /**
   2  *  \file GraphicsConverter.C
   3  *  Copyright 2002 the LyX Team
   4  *  Read the file COPYING
   5  *
   6  *  \author Angus Leeming <leeming@lyx.org>
   7  */
   8
   9 #include <config.h>
  10
  11 #ifdef __GNUG__
  12 #pragma implementation
  13 #endif
  14
  15 #include "GraphicsConverter.h"
  16
  17 #include "converter.h"
  18 #include "debug.h"
  19
  20 #include "support/filetools.h"
  21 #include "support/forkedcall.h"
  22 #include "support/lyxlib.h"
  23
  24 #include <boost/bind.hpp>
  25 #include <boost/signals/trackable.hpp>
  26
  27 #include "Lsstream.h"
  28 #include <fstream>
  29 #include <sys/types.h> // needed for pid_t
  30
  31 using std::endl;
  32
  33 namespace grfx {
  34
  35 struct Converter::Impl : public boost::signals::trackable {
  36         ///
  37         Impl(string const &, string const &, string const &, string const &);
  38
  39         ///
  40         void startConversion();
  41
  42         /** This method is connected to a signal passed to the forked call
  43          *  class, passing control back here when the conversion is completed.
  44          *  Cleans-up the temporary files, emits the finishedConversion
  45          *  signal and removes the Converter from the list of all processes.
  46          */
  47         void converted(string const & cmd, pid_t pid, int retval);
  48
  49         /** At the end of the conversion process inform the outside world
  50          *  by emitting a signal.
  51          */
  52         typedef boost::signal1<void, bool> SignalType;
  53         ///
  54         SignalType finishedConversion;
  55
  56         ///
  57         string script_command_;
  58         ///
  59         string script_file_;
  60         ///
  61         string to_file_;
  62         ///
  63         bool valid_process_;
  64         ///
  65         bool finished_;
  66 };
  67
  68
  69 bool Converter::isReachable(string const & from_format_name,
  70                             string const & to_format_name)
  71 {
  72         return converters.isReachable(from_format_name, to_format_name);
  73 }
  74
  75
  76 Converter::Converter(string const & from_file,   string const & to_file_base,
  77                      string const & from_format, string const & to_format)
  78         : pimpl_(new Impl(from_file, to_file_base, from_format, to_format))
  79 {}
  80
  81
  82 Converter::~Converter()
  83 {}
  84
  85
  86 void Converter::startConversion() const
  87 {
  88         pimpl_->startConversion();
  89 }
  90
  91
  92 boost::signals::connection Converter::connect(slot_type const & slot) const
  93 {
  94         return pimpl_->finishedConversion.connect(slot);
  95 }
  96
  97
  98 string const & Converter::convertedFile() const
  99 {
 100         static string const empty;
 101         return pimpl_->finished_ ? pimpl_->to_file_ : empty;
 102 }
 103
 104 } // namespace grfx
 105
 106 //------------------------------
 107 // Implementation details follow
 108 //------------------------------
 109
 110 namespace {
 111
 112 /** Build the conversion script, returning true if able to build it.
 113  *  The script is output to the ostringstream 'script'.
 114  */
 115 bool build_script(string const & from_file, string const & to_file_base,
 116                   string const & from_format, string const & to_format,
 117                   ostringstream & script);
 118
 119 } // namespace anon
 120
 121
 122 namespace grfx {
 123
 124 Converter::Impl::Impl(string const & from_file,   string const & to_file_base,
 125                       string const & from_format, string const & to_format)
 126         : valid_process_(false), finished_(false)
 127 {
 128         lyxerr[Debug::GRAPHICS] << "Converter c-tor:\n"
 129                 << "\tfrom_file:      " << from_file
 130                 << "\n\tto_file_base: " << to_file_base
 131                 << "\n\tfrom_format:  " << from_format
 132                 << "\n\tto_format:    " << to_format << endl;
 133
 134         // The conversion commands are stored in a stringstream
 135         ostringstream script;
 136         script << "#!/bin/sh\n";
 137         bool const success = build_script(from_file, to_file_base,
 138                                           from_format, to_format, script);
 139
 140         if (!success)
 141                 return;
 142
 143         lyxerr[Debug::GRAPHICS] << "\tConversion script:"
 144                                 << "\n--------------------------------------\n"
 145                                 << script.str().c_str()
 146                                 << "\n--------------------------------------\n";
 147
 148         // Output the script to file.
 149         static int counter = 0;
 150         script_file_ = OnlyPath(to_file_base) + "lyxconvert" +
 151                        tostr(counter++) + ".sh";
 152
 153         std::ofstream fs(script_file_.c_str());
 154         if (!fs.good())
 155                 return;
 156
 157         fs << script.str().c_str();
 158         fs.close();
 159
 160         // The converted image is to be stored in this file
 161         // We do not use ChangeExtension here because this is a
 162         // basename, which may nevertheless contain a dot
 163         to_file_ = to_file_base + '.' + formats.extension(to_format);
 164
 165         // The command needed to run the conversion process
 166         // We create a dummy command for ease of understanding of the
 167         // list of forked processes.
 168         // Note that 'sh ' is absolutely essential, or execvp will fail.
 169         script_command_ = "sh " + script_file_ + " " +
 170                           OnlyFilename(from_file) + " " + to_format;
 171
 172         // All is ready to go
 173         valid_process_ = true;
 174 }
 175
 176
 177 void Converter::Impl::startConversion()
 178 {
 179         if (!valid_process_) {
 180                 converted(string(), 0, 1);
 181                 return;
 182         }
 183
 184         // Initiate the conversion
 185         Forkedcall::SignalTypePtr convert_ptr;
 186         convert_ptr.reset(new Forkedcall::SignalType);
 187
 188         convert_ptr->connect(
 189                 boost::bind(&Impl::converted, this, _1, _2, _3));
 190
 191         Forkedcall call;
 192         int retval = call.startscript(script_command_, convert_ptr);
 193         if (retval > 0) {
 194                 // Unable to even start the script, so clean-up the mess!
 195                 converted(string(), 0, 1);
 196         }
 197 }
 198
 199
 200 void Converter::Impl::converted(string const & /* cmd */,
 201                                 pid_t /* pid */, int retval)
 202 {
 203         if (finished_)
 204                 // We're done already!
 205                 return;
 206
 207         finished_ = true;
 208         // Clean-up behind ourselves
 209         lyx::unlink(script_file_);
 210
 211         if (retval > 0) {
 212                 lyx::unlink(to_file_);
 213                 to_file_.erase();
 214                 finishedConversion(false);
 215         } else {
 216                 finishedConversion(true);
 217         }
 218 }
 219
 220 } // namespace grfx
 221
 222 namespace {
 223
 224 string const move_file(string const & from_file, string const & to_file)
 225 {
 226         if (from_file == to_file)
 227                 return string();
 228
 229         ostringstream command;
 230         command << "fromfile=" << from_file << "\n"
 231                 << "tofile="   << to_file << "\n\n"
 232                 << "'mv' -f ${fromfile} ${tofile}\n"
 233                 << "if [ $? -ne 0 ]; then\n"
 234                 << "\t'cp' -f ${fromfile} ${tofile}\n"
 235                 << "\tif [ $? -ne 0 ]; then\n"
 236                 << "\t\texit 1\n"
 237                 << "\tfi\n"
 238                 << "\t'rm' -f ${fromfile}\n"
 239                 << "fi\n";
 240
 241         return command.str().c_str();
 242 }
 243
 244 bool build_script(string const & from_file,
 245                   string const & to_file_base,
 246                   string const & from_format,
 247                   string const & to_format,
 248                   ostringstream & script)
 249 {
 250         lyxerr[Debug::GRAPHICS] << "build_script ... ";
 251         typedef Converters::EdgePath EdgePath;
 252
 253         string const to_file = ChangeExtension(to_file_base,
 254                                                formats.extension(to_format));
 255
 256         if (from_format == to_format) {
 257                 script << move_file(QuoteName(from_file), QuoteName(to_file));
 258                 lyxerr[Debug::GRAPHICS] << "ready (from == to)" << endl;
 259                 return true;
 260         }
 261
 262         EdgePath edgepath = converters.getPath(from_format, to_format);
 263
 264         if (edgepath.empty()) {
 265                 lyxerr[Debug::GRAPHICS] << "ready (edgepath.empty())" << endl;
 266                 return false;
 267         }
 268
 269         // Create a temporary base file-name for all intermediate steps.
 270         // Remember to remove the temp file because we only want the name...
 271         static int counter = 0;
 272         string const tmp = "gconvert" + tostr(counter++);
 273         string const to_base = lyx::tempName(string(), tmp);
 274         lyx::unlink(to_base);
 275
 276         string outfile = from_file;
 277
 278         // The conversion commands may contain these tokens that need to be
 279         // changed to infile, infile_base, outfile respectively.
 280         string const token_from("$$i");
 281         string const token_base("$$b");
 282         string const token_to("$$o");
 283
 284         EdgePath::const_iterator it  = edgepath.begin();
 285         EdgePath::const_iterator end = edgepath.end();
 286
 287         for (; it != end; ++it) {
 288                 ::Converter const & conv = converters.get(*it);
 289
 290                 // Build the conversion command
 291                 string const infile      = outfile;
 292                 string const infile_base = ChangeExtension(infile, string());
 293                 outfile = ChangeExtension(to_base, conv.To->extension());
 294
 295                 // Store these names in the shell script
 296                 script << "infile="      << QuoteName(infile) << '\n'
 297                        << "infile_base=" << QuoteName(infile_base) << '\n'
 298                        << "outfile="     << QuoteName(outfile) << '\n';
 299
 300                 string command = conv.command;
 301                 command = subst(command, token_from, "${infile}");
 302                 command = subst(command, token_base, "${infile_base}");
 303                 command = subst(command, token_to,   "${outfile}");
 304                 command = LibScriptSearch(command);
 305
 306                 // Store in the shell script
 307                 script << "\n" << command << "\n\n";
 308
 309                 // Test that this was successful. If not, remove
 310                 // ${outfile} and exit the shell script
 311                 script << "if [ $? -ne 0 ]; then\n"
 312                        << "\t'rm' -f ${outfile}\n"
 313                        << "\texit 1\n"
 314                        << "fi\n\n";
 315
 316                 // Test that the outfile exists.
 317                 // ImageMagick's convert will often create ${outfile}.0,
 318                 // ${outfile}.1.
 319                 // If this occurs, move ${outfile}.0 to ${outfile}
 320                 // and delete ${outfile}.?
 321                 script << "if [ ! -f ${outfile} ]; then\n"
 322                        << "\tif [ -f ${outfile}.0 ]; then\n"
 323                        << "\t\t'mv' -f ${outfile}.0 ${outfile}\n"
 324                        << "\t\t'rm' -f ${outfile}.?\n"
 325                        << "\telse\n"
 326                        << "\t\texit 1\n"
 327                        << "\tfi\n"
 328                        << "fi\n\n";
 329
 330                 // Delete the infile, if it isn't the original, from_file.
 331                 if (infile != from_file) {
 332                         script << "'rm' -f ${infile}\n\n";
 333                 }
 334         }
 335
 336         // Move the final outfile to to_file
 337         script << move_file("${outfile}", QuoteName(to_file));
 338         lyxerr[Debug::GRAPHICS] << "ready!" << endl;
 339
 340         return true;
 341 }
 342
 343 } // namespace anon