src/execute.c

   1 /*
   2    Execution routines for GNU Midnight Commander
   3
   4    Copyright (C) 2003, 2004, 2005, 2007, 2011
   5    The Free Software Foundation, Inc.
   6
   7    This file is part of the Midnight Commander.
   8
   9    The Midnight Commander is free software: you can redistribute it
  10    and/or modify it under the terms of the GNU General Public License as
  11    published by the Free Software Foundation, either version 3 of the License,
  12    or (at your option) any later version.
  13
  14    The Midnight Commander is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 /** \file  execute.c
  24  *  \brief Source: execution routines
  25  */
  26
  27 #include <config.h>
  28
  29 #include <signal.h>
  30 #include <sys/stat.h>
  31 #include <sys/time.h>
  32
  33 #include "lib/global.h"
  34
  35 #include "lib/tty/tty.h"
  36 #include "lib/tty/key.h"
  37 #include "lib/tty/win.h"
  38 #include "lib/vfs/vfs.h"
  39 #include "lib/util.h"
  40 #include "lib/widget.h"
  41
  42 #include "filemanager/midnight.h"
  43 #include "filemanager/layout.h" /* use_dash() */
  44 #include "consaver/cons.saver.h"
  45 #include "subshell.h"
  46 #include "setup.h"              /* clear_before_exec */
  47
  48 #include "execute.h"
  49
  50 /*** global variables ****************************************************************************/
  51
  52 int pause_after_run = pause_on_dumb_terminals;
  53
  54 /*** file scope macro definitions ****************************************************************/
  55
  56 /*** file scope type declarations ****************************************************************/
  57
  58 /*** file scope variables ************************************************************************/
  59
  60 /*** file scope functions ************************************************************************/
  61 /* --------------------------------------------------------------------------------------------- */
  62
  63 static void
  64 edition_post_exec (void)
  65 {
  66     do_enter_ca_mode ();
  67
  68     /* FIXME: Missing on slang endwin? */
  69     tty_reset_prog_mode ();
  70     tty_flush_input ();
  71
  72     tty_keypad (TRUE);
  73     tty_raw_mode ();
  74     channels_up ();
  75     enable_mouse ();
  76     if (mc_global.tty.alternate_plus_minus)
  77         application_keypad_mode ();
  78 }
  79
  80 /* --------------------------------------------------------------------------------------------- */
  81
  82 static void
  83 edition_pre_exec (void)
  84 {
  85     if (clear_before_exec)
  86         clr_scr ();
  87     else
  88     {
  89         if (!(mc_global.tty.console_flag != '\0' || mc_global.tty.xterm_flag))
  90             printf ("\n\n");
  91     }
  92
  93     channels_down ();
  94     disable_mouse ();
  95
  96     tty_reset_shell_mode ();
  97     tty_keypad (FALSE);
  98     tty_reset_screen ();
  99
 100     numeric_keypad_mode ();
 101
 102     /* on xterms: maybe endwin did not leave the terminal on the shell
 103      * screen page: do it now.
 104      *
 105      * Do not move this before endwin: in some systems rmcup includes
 106      * a call to clear screen, so it will end up clearing the shell screen.
 107      */
 108     do_exit_ca_mode ();
 109 }
 110
 111 /* --------------------------------------------------------------------------------------------- */
 112
 113 #ifdef HAVE_SUBSHELL_SUPPORT
 114 static void
 115 do_possible_cd (const char *new_dir)
 116 {
 117     if (!do_cd (new_dir, cd_exact))
 118         message (D_ERROR, _("Warning"),
 119                  _("The Commander can't change to the directory that\n"
 120                    "the subshell claims you are in. Perhaps you have\n"
 121                    "deleted your working directory, or given yourself\n"
 122                    "extra access permissions with the \"su\" command?"));
 123 }
 124 #endif /* HAVE_SUBSHELL_SUPPORT */
 125
 126 /* --------------------------------------------------------------------------------------------- */
 127
 128 static void
 129 do_execute (const char *lc_shell, const char *command, int flags)
 130 {
 131 #ifdef HAVE_SUBSHELL_SUPPORT
 132     char *new_dir = NULL;
 133 #endif /* HAVE_SUBSHELL_SUPPORT */
 134
 135     char *old_vfs_dir = 0;
 136
 137     if (!vfs_current_is_local ())
 138         old_vfs_dir = vfs_get_current_dir ();
 139
 140     if (mc_global.mc_run_mode == MC_RUN_FULL)
 141         save_cwds_stat ();
 142     pre_exec ();
 143     if (mc_global.tty.console_flag != '\0')
 144         handle_console (CONSOLE_RESTORE);
 145
 146     if (!mc_global.tty.use_subshell && command && !(flags & EXECUTE_INTERNAL))
 147     {
 148         printf ("%s%s\n", mc_prompt, command);
 149         fflush (stdout);
 150     }
 151 #ifdef HAVE_SUBSHELL_SUPPORT
 152     if (mc_global.tty.use_subshell && !(flags & EXECUTE_INTERNAL))
 153     {
 154         do_update_prompt ();
 155
 156         /* We don't care if it died, higher level takes care of this */
 157         invoke_subshell (command, VISIBLY, old_vfs_dir ? NULL : &new_dir);
 158     }
 159     else
 160 #endif /* HAVE_SUBSHELL_SUPPORT */
 161         my_system (flags, lc_shell, command);
 162
 163     if (!(flags & EXECUTE_INTERNAL))
 164     {
 165         if ((pause_after_run == pause_always
 166              || (pause_after_run == pause_on_dumb_terminals && !mc_global.tty.xterm_flag
 167                  && mc_global.tty.console_flag == '\0')) && quit == 0
 168 #ifdef HAVE_SUBSHELL_SUPPORT
 169             && subshell_state != RUNNING_COMMAND
 170 #endif /* HAVE_SUBSHELL_SUPPORT */
 171             )
 172         {
 173             printf (_("Press any key to continue..."));
 174             fflush (stdout);
 175             tty_raw_mode ();
 176             get_key_code (0);
 177             printf ("\r\n");
 178             fflush (stdout);
 179         }
 180         if (mc_global.tty.console_flag != '\0')
 181         {
 182             if (output_lines && mc_global.keybar_visible)
 183             {
 184                 putchar ('\n');
 185                 fflush (stdout);
 186             }
 187         }
 188     }
 189
 190     if (mc_global.tty.console_flag != '\0')
 191         handle_console (CONSOLE_SAVE);
 192     edition_post_exec ();
 193
 194 #ifdef HAVE_SUBSHELL_SUPPORT
 195     if (new_dir)
 196         do_possible_cd (new_dir);
 197
 198 #endif /* HAVE_SUBSHELL_SUPPORT */
 199
 200     if (old_vfs_dir)
 201     {
 202         mc_chdir (old_vfs_dir);
 203         g_free (old_vfs_dir);
 204     }
 205
 206     if (mc_global.mc_run_mode == MC_RUN_FULL)
 207     {
 208         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 209         update_xterm_title_path ();
 210     }
 211
 212     do_refresh ();
 213     use_dash (TRUE);
 214 }
 215
 216 /* --------------------------------------------------------------------------------------------- */
 217
 218 static void
 219 do_suspend_cmd (void)
 220 {
 221     pre_exec ();
 222
 223     if (mc_global.tty.console_flag != '\0' && !mc_global.tty.use_subshell)
 224         handle_console (CONSOLE_RESTORE);
 225
 226 #ifdef SIGTSTP
 227     {
 228         struct sigaction sigtstp_action;
 229
 230         /* Make sure that the SIGTSTP below will suspend us directly,
 231            without calling ncurses' SIGTSTP handler; we *don't* want
 232            ncurses to redraw the screen immediately after the SIGCONT */
 233         sigaction (SIGTSTP, &startup_handler, &sigtstp_action);
 234
 235         kill (getpid (), SIGTSTP);
 236
 237         /* Restore previous SIGTSTP action */
 238         sigaction (SIGTSTP, &sigtstp_action, NULL);
 239     }
 240 #endif /* SIGTSTP */
 241
 242     if (mc_global.tty.console_flag != '\0' && !mc_global.tty.use_subshell)
 243         handle_console (CONSOLE_SAVE);
 244
 245     edition_post_exec ();
 246 }
 247
 248 /* --------------------------------------------------------------------------------------------- */
 249 /*** public functions ****************************************************************************/
 250 /* --------------------------------------------------------------------------------------------- */
 251
 252 /** Set up the terminal before executing a program */
 253
 254 void
 255 pre_exec (void)
 256 {
 257     use_dash (FALSE);
 258     edition_pre_exec ();
 259 }
 260
 261 /* --------------------------------------------------------------------------------------------- */
 262 /** Hide the terminal after executing a program */
 263 void
 264 post_exec (void)
 265 {
 266     edition_post_exec ();
 267     use_dash (TRUE);
 268     repaint_screen ();
 269 }
 270
 271 /* --------------------------------------------------------------------------------------------- */
 272 /* Executes a command */
 273
 274 void
 275 shell_execute (const char *command, int flags)
 276 {
 277     char *cmd = NULL;
 278
 279     if (flags & EXECUTE_HIDE)
 280     {
 281         cmd = g_strconcat (" ", command, (char *) NULL);
 282         flags ^= EXECUTE_HIDE;
 283     }
 284
 285 #ifdef HAVE_SUBSHELL_SUPPORT
 286     if (mc_global.tty.use_subshell)
 287         if (subshell_state == INACTIVE)
 288             do_execute (shell, cmd ? cmd : command, flags | EXECUTE_AS_SHELL);
 289         else
 290             message (D_ERROR, MSG_ERROR, _("The shell is already running a command"));
 291     else
 292 #endif /* HAVE_SUBSHELL_SUPPORT */
 293         do_execute (shell, cmd ? cmd : command, flags | EXECUTE_AS_SHELL);
 294
 295     g_free (cmd);
 296 }
 297
 298 /* --------------------------------------------------------------------------------------------- */
 299
 300 void
 301 exec_shell (void)
 302 {
 303     do_execute (shell, 0, 0);
 304 }
 305
 306 /* --------------------------------------------------------------------------------------------- */
 307
 308 void
 309 toggle_panels (void)
 310 {
 311 #ifdef HAVE_SUBSHELL_SUPPORT
 312     char *new_dir = NULL;
 313     char **new_dir_p;
 314 #endif /* HAVE_SUBSHELL_SUPPORT */
 315
 316     channels_down ();
 317     disable_mouse ();
 318     if (clear_before_exec)
 319         clr_scr ();
 320     if (mc_global.tty.alternate_plus_minus)
 321         numeric_keypad_mode ();
 322 #ifndef HAVE_SLANG
 323     /* With slang we don't want any of this, since there
 324      * is no raw_mode supported
 325      */
 326     tty_reset_shell_mode ();
 327 #endif /* !HAVE_SLANG */
 328     tty_noecho ();
 329     tty_keypad (FALSE);
 330     tty_reset_screen ();
 331     do_exit_ca_mode ();
 332     tty_raw_mode ();
 333     if (mc_global.tty.console_flag != '\0')
 334         handle_console (CONSOLE_RESTORE);
 335
 336 #ifdef HAVE_SUBSHELL_SUPPORT
 337     if (mc_global.tty.use_subshell)
 338     {
 339         new_dir_p = vfs_current_is_local ()? &new_dir : NULL;
 340         invoke_subshell (NULL, VISIBLY, new_dir_p);
 341     }
 342     else
 343 #endif /* HAVE_SUBSHELL_SUPPORT */
 344     {
 345         if (output_starts_shell)
 346         {
 347             fprintf (stderr, _("Type `exit' to return to the Midnight Commander"));
 348             fprintf (stderr, "\n\r\n\r");
 349
 350             my_system (EXECUTE_INTERNAL, shell, NULL);
 351         }
 352         else
 353             get_key_code (0);
 354     }
 355
 356     if (mc_global.tty.console_flag != '\0')
 357         handle_console (CONSOLE_SAVE);
 358
 359     do_enter_ca_mode ();
 360
 361     tty_reset_prog_mode ();
 362     tty_keypad (TRUE);
 363
 364     /* Prevent screen flash when user did 'exit' or 'logout' within
 365        subshell */
 366     if ((quit & SUBSHELL_EXIT) != 0)
 367     {
 368         /* User did `exit' or `logout': quit MC */
 369         if (quiet_quit_cmd ())
 370             return;
 371
 372         quit = 0;
 373 #ifdef HAVE_SUBSHELL_SUPPORT
 374         /* restart subshell */
 375         if (mc_global.tty.use_subshell)
 376             init_subshell ();
 377 #endif /* HAVE_SUBSHELL_SUPPORT */
 378     }
 379
 380     enable_mouse ();
 381     channels_up ();
 382     if (mc_global.tty.alternate_plus_minus)
 383         application_keypad_mode ();
 384
 385 #ifdef HAVE_SUBSHELL_SUPPORT
 386     if (mc_global.tty.use_subshell)
 387     {
 388         load_prompt (0, NULL);
 389         if (new_dir)
 390             do_possible_cd (new_dir);
 391         if (mc_global.tty.console_flag != '\0' && output_lines)
 392             show_console_contents (output_start_y,
 393                                    LINES - mc_global.keybar_visible - output_lines -
 394                                    1, LINES - mc_global.keybar_visible - 1);
 395     }
 396 #endif /* HAVE_SUBSHELL_SUPPORT */
 397
 398     if (mc_global.mc_run_mode == MC_RUN_FULL)
 399     {
 400         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 401         update_xterm_title_path ();
 402     }
 403     repaint_screen ();
 404 }
 405
 406 /* --------------------------------------------------------------------------------------------- */
 407
 408 /* event callback */
 409 gboolean
 410 execute_suspend (const gchar * event_group_name, const gchar * event_name,
 411                  gpointer init_data, gpointer data)
 412 {
 413     (void) event_group_name;
 414     (void) event_name;
 415     (void) init_data;
 416     (void) data;
 417
 418     if (mc_global.mc_run_mode == MC_RUN_FULL)
 419         save_cwds_stat ();
 420     do_suspend_cmd ();
 421     if (mc_global.mc_run_mode == MC_RUN_FULL)
 422         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 423     do_refresh ();
 424
 425     return TRUE;
 426 }
 427
 428 /* --------------------------------------------------------------------------------------------- */
 429 /**
 430  * Execute command on a filename that can be on VFS.
 431  * Errors are reported to the user.
 432  */
 433
 434 void
 435 execute_with_vfs_arg (const char *command, const char *filename)
 436 {
 437     char *localcopy;
 438     char *fn;
 439     struct stat st;
 440     time_t mtime;
 441     vfs_path_t *vpath = vfs_path_from_str (filename);
 442
 443     /* Simplest case, this file is local */
 444     if (!filename || vfs_file_is_local (vpath))
 445     {
 446         fn = vfs_path_to_str (vpath);
 447         do_execute (command, fn, EXECUTE_INTERNAL);
 448         g_free (fn);
 449         vfs_path_free (vpath);
 450         return;
 451     }
 452     vfs_path_free (vpath);
 453
 454     /* FIXME: Creation of new files on VFS is not supported */
 455     if (!*filename)
 456         return;
 457
 458     localcopy = mc_getlocalcopy (filename);
 459     if (localcopy == NULL)
 460     {
 461         message (D_ERROR, MSG_ERROR, _("Cannot fetch a local copy of %s"), filename);
 462         return;
 463     }
 464
 465     /*
 466      * filename can be an entry on panel, it can be changed by executing
 467      * the command, so make a copy.  Smarter VFS code would make the code
 468      * below unnecessary.
 469      */
 470     fn = g_strdup (filename);
 471     mc_stat (localcopy, &st);
 472     mtime = st.st_mtime;
 473     do_execute (command, localcopy, EXECUTE_INTERNAL);
 474     mc_stat (localcopy, &st);
 475     mc_ungetlocalcopy (fn, localcopy, mtime != st.st_mtime);
 476     g_free (localcopy);
 477     g_free (fn);
 478 }
 479
 480 /* --------------------------------------------------------------------------------------------- */