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 != NULL)
 201     {
 202         vfs_path_t *vpath;
 203
 204         vpath = vfs_path_from_str (old_vfs_dir);
 205         mc_chdir (vpath);
 206         vfs_path_free (vpath);
 207         g_free (old_vfs_dir);
 208     }
 209
 210     if (mc_global.mc_run_mode == MC_RUN_FULL)
 211     {
 212         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 213         update_xterm_title_path ();
 214     }
 215
 216     do_refresh ();
 217     use_dash (TRUE);
 218 }
 219
 220 /* --------------------------------------------------------------------------------------------- */
 221
 222 static void
 223 do_suspend_cmd (void)
 224 {
 225     pre_exec ();
 226
 227     if (mc_global.tty.console_flag != '\0' && !mc_global.tty.use_subshell)
 228         handle_console (CONSOLE_RESTORE);
 229
 230 #ifdef SIGTSTP
 231     {
 232         struct sigaction sigtstp_action;
 233
 234         /* Make sure that the SIGTSTP below will suspend us directly,
 235            without calling ncurses' SIGTSTP handler; we *don't* want
 236            ncurses to redraw the screen immediately after the SIGCONT */
 237         sigaction (SIGTSTP, &startup_handler, &sigtstp_action);
 238
 239         kill (getpid (), SIGTSTP);
 240
 241         /* Restore previous SIGTSTP action */
 242         sigaction (SIGTSTP, &sigtstp_action, NULL);
 243     }
 244 #endif /* SIGTSTP */
 245
 246     if (mc_global.tty.console_flag != '\0' && !mc_global.tty.use_subshell)
 247         handle_console (CONSOLE_SAVE);
 248
 249     edition_post_exec ();
 250 }
 251
 252 /* --------------------------------------------------------------------------------------------- */
 253 /*** public functions ****************************************************************************/
 254 /* --------------------------------------------------------------------------------------------- */
 255
 256 /** Set up the terminal before executing a program */
 257
 258 void
 259 pre_exec (void)
 260 {
 261     use_dash (FALSE);
 262     edition_pre_exec ();
 263 }
 264
 265 /* --------------------------------------------------------------------------------------------- */
 266 /** Hide the terminal after executing a program */
 267 void
 268 post_exec (void)
 269 {
 270     edition_post_exec ();
 271     use_dash (TRUE);
 272     repaint_screen ();
 273 }
 274
 275 /* --------------------------------------------------------------------------------------------- */
 276 /* Executes a command */
 277
 278 void
 279 shell_execute (const char *command, int flags)
 280 {
 281     char *cmd = NULL;
 282
 283     if (flags & EXECUTE_HIDE)
 284     {
 285         cmd = g_strconcat (" ", command, (char *) NULL);
 286         flags ^= EXECUTE_HIDE;
 287     }
 288
 289 #ifdef HAVE_SUBSHELL_SUPPORT
 290     if (mc_global.tty.use_subshell)
 291         if (subshell_state == INACTIVE)
 292             do_execute (shell, cmd ? cmd : command, flags | EXECUTE_AS_SHELL);
 293         else
 294             message (D_ERROR, MSG_ERROR, _("The shell is already running a command"));
 295     else
 296 #endif /* HAVE_SUBSHELL_SUPPORT */
 297         do_execute (shell, cmd ? cmd : command, flags | EXECUTE_AS_SHELL);
 298
 299     g_free (cmd);
 300 }
 301
 302 /* --------------------------------------------------------------------------------------------- */
 303
 304 void
 305 exec_shell (void)
 306 {
 307     do_execute (shell, 0, 0);
 308 }
 309
 310 /* --------------------------------------------------------------------------------------------- */
 311
 312 void
 313 toggle_panels (void)
 314 {
 315 #ifdef HAVE_SUBSHELL_SUPPORT
 316     char *new_dir = NULL;
 317     char **new_dir_p;
 318 #endif /* HAVE_SUBSHELL_SUPPORT */
 319
 320     channels_down ();
 321     disable_mouse ();
 322     if (clear_before_exec)
 323         clr_scr ();
 324     if (mc_global.tty.alternate_plus_minus)
 325         numeric_keypad_mode ();
 326 #ifndef HAVE_SLANG
 327     /* With slang we don't want any of this, since there
 328      * is no raw_mode supported
 329      */
 330     tty_reset_shell_mode ();
 331 #endif /* !HAVE_SLANG */
 332     tty_noecho ();
 333     tty_keypad (FALSE);
 334     tty_reset_screen ();
 335     do_exit_ca_mode ();
 336     tty_raw_mode ();
 337     if (mc_global.tty.console_flag != '\0')
 338         handle_console (CONSOLE_RESTORE);
 339
 340 #ifdef HAVE_SUBSHELL_SUPPORT
 341     if (mc_global.tty.use_subshell)
 342     {
 343         new_dir_p = vfs_current_is_local ()? &new_dir : NULL;
 344         invoke_subshell (NULL, VISIBLY, new_dir_p);
 345     }
 346     else
 347 #endif /* HAVE_SUBSHELL_SUPPORT */
 348     {
 349         if (output_starts_shell)
 350         {
 351             fprintf (stderr, _("Type `exit' to return to the Midnight Commander"));
 352             fprintf (stderr, "\n\r\n\r");
 353
 354             my_system (EXECUTE_INTERNAL, shell, NULL);
 355         }
 356         else
 357             get_key_code (0);
 358     }
 359
 360     if (mc_global.tty.console_flag != '\0')
 361         handle_console (CONSOLE_SAVE);
 362
 363     do_enter_ca_mode ();
 364
 365     tty_reset_prog_mode ();
 366     tty_keypad (TRUE);
 367
 368     /* Prevent screen flash when user did 'exit' or 'logout' within
 369        subshell */
 370     if ((quit & SUBSHELL_EXIT) != 0)
 371     {
 372         /* User did `exit' or `logout': quit MC */
 373         if (quiet_quit_cmd ())
 374             return;
 375
 376         quit = 0;
 377 #ifdef HAVE_SUBSHELL_SUPPORT
 378         /* restart subshell */
 379         if (mc_global.tty.use_subshell)
 380             init_subshell ();
 381 #endif /* HAVE_SUBSHELL_SUPPORT */
 382     }
 383
 384     enable_mouse ();
 385     channels_up ();
 386     if (mc_global.tty.alternate_plus_minus)
 387         application_keypad_mode ();
 388
 389 #ifdef HAVE_SUBSHELL_SUPPORT
 390     if (mc_global.tty.use_subshell)
 391     {
 392         do_load_prompt ();
 393         if (new_dir)
 394             do_possible_cd (new_dir);
 395         if (mc_global.tty.console_flag != '\0' && output_lines)
 396             show_console_contents (output_start_y,
 397                                    LINES - mc_global.keybar_visible - output_lines -
 398                                    1, LINES - mc_global.keybar_visible - 1);
 399     }
 400 #endif /* HAVE_SUBSHELL_SUPPORT */
 401
 402     if (mc_global.mc_run_mode == MC_RUN_FULL)
 403     {
 404         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 405         update_xterm_title_path ();
 406     }
 407     repaint_screen ();
 408 }
 409
 410 /* --------------------------------------------------------------------------------------------- */
 411
 412 /* event callback */
 413 gboolean
 414 execute_suspend (const gchar * event_group_name, const gchar * event_name,
 415                  gpointer init_data, gpointer data)
 416 {
 417     (void) event_group_name;
 418     (void) event_name;
 419     (void) init_data;
 420     (void) data;
 421
 422     if (mc_global.mc_run_mode == MC_RUN_FULL)
 423         save_cwds_stat ();
 424     do_suspend_cmd ();
 425     if (mc_global.mc_run_mode == MC_RUN_FULL)
 426         update_panels (UP_OPTIMIZE, UP_KEEPSEL);
 427     do_refresh ();
 428
 429     return TRUE;
 430 }
 431
 432 /* --------------------------------------------------------------------------------------------- */
 433 /**
 434  * Execute command on a filename that can be on VFS.
 435  * Errors are reported to the user.
 436  */
 437
 438 void
 439 execute_with_vfs_arg (const char *command, const char *filename)
 440 {
 441     struct stat st;
 442     time_t mtime;
 443     vfs_path_t *vpath = vfs_path_from_str (filename);
 444     vfs_path_t *localcopy_vpath;
 445
 446     /* Simplest case, this file is local */
 447     if (!filename || vfs_file_is_local (vpath))
 448     {
 449         do_execute (command, vfs_path_get_last_path_str (vpath), EXECUTE_INTERNAL);
 450         vfs_path_free (vpath);
 451         return;
 452     }
 453
 454     /* FIXME: Creation of new files on VFS is not supported */
 455     if (!*filename)
 456     {
 457         vfs_path_free (vpath);
 458         return;
 459     }
 460
 461     localcopy_vpath = mc_getlocalcopy (vpath);
 462     if (localcopy_vpath == NULL)
 463     {
 464         message (D_ERROR, MSG_ERROR, _("Cannot fetch a local copy of %s"), filename);
 465         vfs_path_free (vpath);
 466         return;
 467     }
 468
 469     /*
 470      * filename can be an entry on panel, it can be changed by executing
 471      * the command, so make a copy.  Smarter VFS code would make the code
 472      * below unnecessary.
 473      */
 474     mc_stat (localcopy_vpath, &st);
 475     mtime = st.st_mtime;
 476     do_execute (command, vfs_path_get_last_path_str (localcopy_vpath), EXECUTE_INTERNAL);
 477     mc_stat (localcopy_vpath, &st);
 478     mc_ungetlocalcopy (vpath, localcopy_vpath, mtime != st.st_mtime);
 479     vfs_path_free (localcopy_vpath);
 480     vfs_path_free (vpath);
 481 }
 482
 483 /* --------------------------------------------------------------------------------------------- */