src/main.c

   1 /*--- main.c -------------------------------------------------------------------
   2 Copyright (C) 2004, 2005, 2006 Sylvain Fourmanoit <syfou@users.sourceforge.net>
   3
   4 Permission is hereby granted, free of charge, to any person obtaining a copy
   5 of this software and associated documentation files (the "Software"), to
   6 deal in the Software without restriction, including without limitation the
   7 rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8 sell copies of the Software, and to permit persons to whom the Software is
   9 furnished to do so, subject to the following conditions:
  10
  11 The above copyright notice and this permission notice shall be included in
  12 all copies of the Software and its documentation and acknowledgment shall be
  13 given in the documentation and software packages that this Software was
  14 used.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  20 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22 ------------------------------------------------------------------------------*/
  23 #include "adesklets.h"                  /* Main application header */
  24
  25 /*----------------------------------------------------------------------------*/
  26 /* Main routine
  27    There are only two ways to invoke adesklets:
  28
  29    - Without arguments: adesklets is used as a simple
  30                         program launcher: all desklets
  31                         in ~/.adesklets are run in forked
  32                         process, and adesklets finally exits.
  33                         All adesklets instances for current user
  34                         that were already running are all killed
  35                         before the launch.
  36                         Environment variable ADESKLETS_ID
  37                         is also set according to config_file
  38                         in all children.
  39    - With arguments:    adesklets is used as an interpreter,
  40                         either interactive of not.
  41
  42                         If adesklets is used non-iteractively:
  43
  44                         - If its first free-form argument is an absolute
  45                         file name to something the current user
  46                         can execute, the windows property
  47                         will be remembered and updated in
  48                         ~/.adesklets and:
  49                                 * If ADESKLETS_ID do not exists
  50                                 in the environment, it will be set
  51                                 to next available unsigned integer
  52                                 * If it exists, it will kept and
  53                                 used to chose configuration bethween
  54                                 different instances of the script.
  55
  56                         - If its first free-form argument is a file name
  57                         to something the current user can execute,
  58                         either absolute or not, restarting the desklet
  59                         will be possible.
  60
  61                         - If its first free-form argument is something
  62                         else, it will simply be discarded.
  63
  64                         If adesklets is used interactively:
  65
  66                         - the first free-form argument is always discarded,
  67                         an a prompt is given.
  68
  69   To complicate things a little further, there is also a customization,
  70   scriptable shell-based layer on top on this: adesklets_frontend.sh,
  71   installed by default inside the $pqgdata_dir directory (yet, the binary
  72   interpreter is fully standalone, and will work without its intervention).
  73   Basically, this adesklets_frontend.sh script, when detected, is
  74   automatically executed before all regular call to the binary. Go read it,
  75   from ../utils/adesklets_frontend.sh, for details.
  76 */
  77 int
  78 main(int argc, char ** argv)
  79 {
  80 #ifdef DEBUG
  81   /* First of all, initialize debug output if applicable */
  82   debug_init();
  83 #endif
  84
  85 #ifdef FRONTEND_SHELL_DRIVER
  86   /* Go through the frontend, as needed */
  87   if (!getenv("ADESKLETS_FRONTEND")) {
  88     debug("Frontend signature not detected: try to execve it.\n");
  89 #ifndef DEBUG
  90     /* Make it possible to run the frontend in-place in case of
  91        debugging compilation or help2man extraction */
  92     if (getenv("ADESKLETS_HELP2MAN"))
  93 #endif
  94       execv("../utils/adesklets_frontend.sh", argv);
  95     execv(PKGDATADIR "/adesklets_frontend.sh", argv);
  96     debug("Could not execute the frontend.\n");
  97   }
  98 #endif
  99
 100   /* Now, perform the core execution */
 101   if(argc>1) {
 102     /* adesklets used as an interpreter */
 103     if (adesklets_init(argc,argv)) {
 104       adesklets_events_loop();
 105       adesklets_free();
 106     }
 107   } else {
 108     /* adesklets used as a desklets launcher */
 109 #ifdef FRONTEND_SHELL_DRIVER
 110     unsetenv("ADESKLETS_FRONTEND");
 111 #endif
 112     cfgfile_loadall();
 113   }
 114 }