src/Mover.h

   1 // -*- C++ -*-
   2 /**
   3  * \file Mover.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Angus Leeming
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #ifndef MOVER_H
  13 #define MOVER_H
  14
  15 #include <map>
  16 #include <string>
  17
  18
  19 namespace lyx {
  20
  21 namespace support { class FileName; }
  22
  23 /**
  24  *  Utility to copy a file of a specified format from one place to another.
  25  *  This base class simply invokes the command support::copy().
  26  */
  27 class Mover
  28 {
  29 public:
  30         virtual ~Mover() {}
  31
  32         /** Copy file @c from to @c to.
  33          *  This version should be used to copy files from the original
  34          *  location to the temporary directory.
  35          *  \returns true if successful.
  36          */
  37         bool
  38         copy(support::FileName const & from, support::FileName const & to) const;
  39
  40         /** Copy file @c from to @c to.
  41          *  \see SpecialisedMover::SpecialisedMover() for an explanation of
  42          *  @c latex.
  43          *  This version should be used to copy files from the temporary
  44          *  directory to the export location, since @c to and @c latex may
  45          *  not be equal in this case.
  46          *  \returns true if successful.
  47          *  NOTE: Although this routine simply calls do_copy() and
  48          *  Mover::do_copy() does not itself make any use of the @c latex argument,
  49          *  SpecialisedMover overrides do_copy(), so SpecialisedMover::copy(), which
  50          *  is just Mover::copy(), calls SpecialisedMover::do_copy(), and the @c latex
  51          *  argument IS in that case used.
  52          */
  53         bool
  54         copy(support::FileName const & from, support::FileName const & to,
  55              std::string const & latex) const
  56         {
  57                 return do_copy(from, to, latex);
  58         }
  59
  60         /** Rename file @c from as @c to.
  61          *  This version should be used to move files from the original
  62          *  location to the temporary directory.
  63          *  \returns true if successful.
  64          */
  65         bool
  66         rename(support::FileName const & from, support::FileName const & to) const;
  67
  68         /** Rename file @c from as @c to.
  69          *  \see SpecialisedMover::SpecialisedMover() for an explanation of
  70          *  @c latex.
  71          *  This version should be used to move files from the temporary
  72          *  directory to the export location, since @c to and @c latex may
  73          *  not be equal in this case.
  74          *  \returns true if successful.
  75          */
  76         bool
  77         rename(support::FileName const & from, support::FileName const & to,
  78                std::string const & latex) const
  79         {
  80                 return do_rename(from, to, latex);
  81         }
  82
  83 protected:
  84         virtual bool
  85         do_copy(support::FileName const & from, support::FileName const & to,
  86                 std::string const &) const;
  87
  88         virtual bool
  89         do_rename(support::FileName const & from, support::FileName const & to,
  90                   std::string const &) const;
  91 };
  92
  93
  94 /**
  95  *  Specialisation of the Mover concept that uses an external command
  96  *  to copy a file.
  97  *
  98  *  For example, an Xfig .fig file can contain references to external
  99  *  picture files. If such a reference has a relative path, then the
 100  *  copied .fig file will require a transformation of the picture file
 101  *  reference if it is to be found by Xfig.
 102  *
 103  *  So, in this case, we need three arguments:
 104  *  (i)   @c from  the location of the file to be moved
 105  *  (ii)  @c to    the location to which it should be moved
 106  *  (iii) @c latex the identifier that should be used in the sort of
 107  *                 transformation just mentioned.
 108  */
 109 class SpecialisedMover : public Mover
 110 {
 111 public:
 112         SpecialisedMover() {}
 113
 114         virtual ~SpecialisedMover() {}
 115
 116         /** @c command should be of the form
 117          *  <code>
 118          *      python $$s/scripts/fig_copy.py $$i $$o $$l
 119          *  </code>
 120          *  where $$s is a placeholder for the lyx support directory,
 121          *        $$i is a placeholder for the name of the file to be moved,
 122          *        $$o is a placeholder for the name of the file after moving,
 123          *        $$l is a placeholder for the latex argument, as explained above.
 124          *  $$o and $$l can only differ if the file is copied from the temporary
 125          *  directory to the export location. If it is copied from the original
 126          *  location to the temporary directory, they are the same, so $$l may be
 127          *  ignored in this case, as it is in the Mover baseclass.
 128          */
 129         SpecialisedMover(std::string const & command)
 130                 : command_(command) {}
 131
 132         /// The template used to launch the external command.
 133         std::string const & command() const { return command_; }
 134
 135 private:
 136         virtual bool
 137         do_copy(support::FileName const & from, support::FileName const & to,
 138                 std::string const & latex) const;
 139
 140         virtual bool
 141         do_rename(support::FileName const & from, support::FileName const & to,
 142                   std::string const & latex) const;
 143
 144         std::string command_;
 145 };
 146
 147
 148 /**
 149  *  Manage the store of (Mover)s.
 150  */
 151 class Movers
 152 {
 153 public:
 154         /** Register a specialised @c command to be used to copy a file
 155          *  of format @c fmt.
 156          */
 157         void set(std::string const & fmt, std::string const & command);
 158
 159         /// @c returns the Mover registered for format @c fmt.
 160         Mover const & operator()(std::string  const & fmt) const;
 161
 162         /** @returns the command template if @c fmt 'finds' a
 163          *  SpecialisedMover. Otherwise, returns an empty string.
 164          */
 165         std::string const command(std::string  const & fmt) const;
 166
 167 private:
 168         typedef std::map<std::string, SpecialisedMover> SpecialsMap;
 169
 170 public:
 171         typedef SpecialsMap::const_iterator const_iterator;
 172         const_iterator begin() const { return specials_.begin(); }
 173         const_iterator end() const { return specials_.end(); }
 174
 175 private:
 176         Mover default_;
 177         SpecialsMap specials_;
 178 };
 179
 180
 181 extern Movers & theMovers();
 182 /// @c returns the Mover registered for format @c fmt.
 183 extern Mover const & getMover(std::string  const & fmt);
 184 /** Register a specialised @c command to be used to copy a file
 185  *  of format @c fmt.
 186  */
 187 extern void setMover(std::string const & fmt, std::string const & command);
 188 extern Movers & theSystemMovers();
 189
 190
 191 } // namespace lyx
 192
 193 #endif // MOVER_H