lyx_mirror/src/graphics/GraphicsConverter.C

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/**
* \file GraphicsConverter.C
* Copyright 2002 the LyX Team
* Read the file COPYING
*
* \author Angus Leeming <leeming@lyx.org>
*/
#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include "GraphicsConverter.h"
#include "converter.h"
#include "debug.h"
#include "support/filetools.h"
#include "support/forkedcall.h"
#include "support/lyxlib.h"
#include <boost/bind.hpp>
#include <boost/signals/trackable.hpp>
#include "Lsstream.h"
#include "support/LOstream.h"
#include <fstream>
#include <sys/types.h> // needed for pid_t
using std::endl;
using std::ostream;
namespace grfx {
struct Converter::Impl : public boost::signals::trackable {
///
Impl(string const &, string const &, string const &, string const &);
///
void startConversion();
/** This method is connected to a signal passed to the forked call
* class, passing control back here when the conversion is completed.
* Cleans-up the temporary files, emits the finishedConversion
* signal and removes the Converter from the list of all processes.
*/
void converted(string const & cmd, pid_t pid, int retval);
/** At the end of the conversion process inform the outside world
* by emitting a signal.
*/
typedef boost::signal1<void, bool> SignalType;
///
SignalType finishedConversion;
///
string script_command_;
///
string script_file_;
///
string to_file_;
///
bool valid_process_;
///
bool finished_;
};
bool Converter::isReachable(string const & from_format_name,
string const & to_format_name)
{
return converters.isReachable(from_format_name, to_format_name);
}
Converter::Converter(string const & from_file, string const & to_file_base,
string const & from_format, string const & to_format)
: pimpl_(new Impl(from_file, to_file_base, from_format, to_format))
{}
// Empty d-tor out-of-line to keep boost::scoped_ptr happy.
Converter::~Converter()
{}
void Converter::startConversion() const
{
pimpl_->startConversion();
}
boost::signals::connection Converter::connect(slot_type const & slot) const
{
return pimpl_->finishedConversion.connect(slot);
}
string const & Converter::convertedFile() const
{
static string const empty;
return pimpl_->finished_ ? pimpl_->to_file_ : empty;
}
} // namespace grfx
//------------------------------
// Implementation details follow
//------------------------------
namespace {
/** Build the conversion script, returning true if able to build it.
* The script is output to the ostringstream 'script'.
*/
bool build_script(string const & from_file, string const & to_file_base,
string const & from_format, string const & to_format,
ostream & script);
} // namespace anon
namespace grfx {
Converter::Impl::Impl(string const & from_file, string const & to_file_base,
string const & from_format, string const & to_format)
: valid_process_(false), finished_(false)
{
lyxerr[Debug::GRAPHICS] << "Converter c-tor:\n"
<< "\tfrom_file: " << from_file
<< "\n\tto_file_base: " << to_file_base
<< "\n\tfrom_format: " << from_format
<< "\n\tto_format: " << to_format << endl;
// The conversion commands are stored in a stringstream
ostringstream script;
script << "#!/bin/sh\n";
bool const success = build_script(from_file, to_file_base,
from_format, to_format, script);
// The converted image is to be stored in this file
to_file_ = ChangeExtension(to_file_base, formats.extension(to_format));
if (!success) {
script_file_ = string();
if (from_format == "lyxpreview") {
script_command_ =
LibFileSearch("scripts", "lyxpreview2xpm.sh")
+ " " +from_file + " " + to_file_;
lyxerr[Debug::GRAPHICS]
<< "\tI use lyxpreview2xpm for the conversion\n\t"
<< script_command_ << endl;
} else {
script_command_ =
LibFileSearch("scripts", "convertDefault.sh") +
' ' + from_format + ':' + from_file + ' ' +
to_format + ':' + to_file_;
lyxerr[Debug::GRAPHICS]
<< "\tNo converter defined! I use convertDefault.sh\n\t"
<< script_command_ << endl;
}
} else {
lyxerr[Debug::GRAPHICS] << "\tConversion script:"
<< "\n--------------------------------------\n"
<< script.str().c_str()
<< "\n--------------------------------------\n";
// Output the script to file.
static int counter = 0;
script_file_ = OnlyPath(to_file_base) + "lyxconvert" +
tostr(counter++) + ".sh";
std::ofstream fs(script_file_.c_str());
if (!fs.good())
return;
fs << script.str().c_str();
fs.close();
// The command needed to run the conversion process
// We create a dummy command for ease of understanding of the
// list of forked processes.
// Note that 'sh ' is absolutely essential, or execvp will fail.
script_command_ = "sh " + script_file_ + " " +
OnlyFilename(from_file) + " " + to_format;
}
// All is ready to go
valid_process_ = true;
}
void Converter::Impl::startConversion()
{
if (!valid_process_) {
converted(string(), 0, 1);
return;
}
// Initiate the conversion
Forkedcall::SignalTypePtr convert_ptr;
convert_ptr.reset(new Forkedcall::SignalType);
convert_ptr->connect(
boost::bind(&Impl::converted, this, _1, _2, _3));
Forkedcall call;
int retval = call.startscript(script_command_, convert_ptr);
if (retval > 0) {
// Unable to even start the script, so clean-up the mess!
converted(string(), 0, 1);
}
}
void Converter::Impl::converted(string const & /* cmd */,
pid_t /* pid */, int retval)
{
if (finished_)
// We're done already!
return;
finished_ = true;
// Clean-up behind ourselves
lyx::unlink(script_file_);
if (retval > 0) {
lyx::unlink(to_file_);
to_file_.erase();
finishedConversion(false);
} else {
finishedConversion(true);
}
}
} // namespace grfx
namespace {
string const move_file(string const & from_file, string const & to_file)
{
if (from_file == to_file)
return string();
ostringstream command;
command << "fromfile=" << from_file << "\n"
<< "tofile=" << to_file << "\n\n"
<< "'mv' -f ${fromfile} ${tofile}\n"
<< "if [ $? -ne 0 ]; then\n"
<< "\t'cp' -f ${fromfile} ${tofile}\n"
<< "\tif [ $? -ne 0 ]; then\n"
<< "\t\texit 1\n"
<< "\tfi\n"
<< "\t'rm' -f ${fromfile}\n"
<< "fi\n";
return command.str().c_str();
}
bool build_script(string const & from_file,
string const & to_file_base,
string const & from_format,
string const & to_format,
ostream & script)
{
lyxerr[Debug::GRAPHICS] << "build_script ... ";
typedef Converters::EdgePath EdgePath;
string const to_file = ChangeExtension(to_file_base,
formats.extension(to_format));
if (from_format == to_format) {
script << move_file(QuoteName(from_file), QuoteName(to_file));
lyxerr[Debug::GRAPHICS] << "ready (from == to)" << endl;
return true;
}
EdgePath edgepath = converters.getPath(from_format, to_format);
if (edgepath.empty()) {
lyxerr[Debug::GRAPHICS] << "ready (edgepath.empty())" << endl;
return false;
}
// Create a temporary base file-name for all intermediate steps.
// Remember to remove the temp file because we only want the name...
static int counter = 0;
string const tmp = "gconvert" + tostr(counter++);
string const to_base = lyx::tempName(string(), tmp);
lyx::unlink(to_base);
string outfile = from_file;
// The conversion commands may contain these tokens that need to be
// changed to infile, infile_base, outfile respectively.
string const token_from("$$i");
string const token_base("$$b");
string const token_to("$$o");
EdgePath::const_iterator it = edgepath.begin();
EdgePath::const_iterator end = edgepath.end();
for (; it != end; ++it) {
::Converter const & conv = converters.get(*it);
// Build the conversion command
string const infile = outfile;
string const infile_base = ChangeExtension(infile, string());
outfile = ChangeExtension(to_base, conv.To->extension());
// Store these names in the shell script
script << "infile=" << QuoteName(infile) << '\n'
<< "infile_base=" << QuoteName(infile_base) << '\n'
<< "outfile=" << QuoteName(outfile) << '\n';
string command = conv.command;
command = subst(command, token_from, "${infile}");
command = subst(command, token_base, "${infile_base}");
command = subst(command, token_to, "${outfile}");
command = LibScriptSearch(command);
// Store in the shell script
script << "\n" << command << "\n\n";
// Test that this was successful. If not, remove
// ${outfile} and exit the shell script
script << "if [ $? -ne 0 ]; then\n"
<< "\t'rm' -f ${outfile}\n"
<< "\texit 1\n"
<< "fi\n\n";
// Test that the outfile exists.
// ImageMagick's convert will often create ${outfile}.0,
// ${outfile}.1.
// If this occurs, move ${outfile}.0 to ${outfile}
// and delete ${outfile}.?
script << "if [ ! -f ${outfile} ]; then\n"
<< "\tif [ -f ${outfile}.0 ]; then\n"
<< "\t\t'mv' -f ${outfile}.0 ${outfile}\n"
<< "\t\t'rm' -f ${outfile}.?\n"
<< "\telse\n"
<< "\t\texit 1\n"
<< "\tfi\n"
<< "fi\n\n";
// Delete the infile, if it isn't the original, from_file.
if (infile != from_file) {
script << "'rm' -f ${infile}\n\n";
}
}
// Move the final outfile to to_file
script << move_file("${outfile}", QuoteName(to_file));
lyxerr[Debug::GRAPHICS] << "ready!" << endl;
return true;
}
} // namespace anon