src/filemanager/ext.c

   1 /*
   2    Extension dependent execution.
   3
   4    Copyright (C) 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   5    2005, 2007, 2011
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Jakub Jelinek, 1995
  10    Miguel de Icaza, 1994
  11
  12    This file is part of the Midnight Commander.
  13
  14    The Midnight Commander is free software: you can redistribute it
  15    and/or modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation, either version 3 of the License,
  17    or (at your option) any later version.
  18
  19    The Midnight Commander is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 /** \file  ext.c
  29  *  \brief Source: extension dependent execution
  30  */
  31
  32 #include <config.h>
  33
  34 #include <ctype.h>
  35 #include <errno.h>
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40
  41 #include "lib/global.h"
  42 #include "lib/tty/tty.h"
  43 #include "lib/search.h"
  44 #include "lib/fileloc.h"
  45 #include "lib/mcconfig.h"
  46 #include "lib/util.h"
  47 #include "lib/vfs/vfs.h"
  48 #include "lib/widget.h"
  49 #ifdef HAVE_CHARSET
  50 #include "lib/charsets.h"       /* get_codepage_index */
  51 #endif
  52
  53 #include "src/setup.h"          /* use_file_to_check_type */
  54 #include "src/execute.h"
  55 #include "src/history.h"
  56
  57 #include "src/consaver/cons.saver.h"
  58 #include "src/viewer/mcviewer.h"
  59
  60 #ifdef HAVE_CHARSET
  61 #include "src/selcodepage.h"    /* do_set_codepage */
  62 #endif
  63
  64 #include "panel.h"              /* do_cd */
  65 #include "usermenu.h"
  66
  67 #include "ext.h"
  68
  69 /*** global variables ****************************************************************************/
  70
  71 /*** file scope macro definitions ****************************************************************/
  72
  73 #ifdef FILE_L
  74 #define FILE_CMD "file -L "
  75 #else
  76 #define FILE_CMD "file "
  77 #endif
  78
  79 /*** file scope type declarations ****************************************************************/
  80
  81 typedef char *(*quote_func_t) (const char *name, int quote_percent);
  82
  83 /*** file scope variables ************************************************************************/
  84
  85 /* This variable points to a copy of the mc.ext file in memory
  86  * With this we avoid loading/parsing the file each time we
  87  * need it
  88  */
  89 static char *data = NULL;
  90 static vfs_path_t *localfilecopy_vpath = NULL;
  91 static char buffer[BUF_1K];
  92
  93 static char *pbuffer = NULL;
  94 static time_t localmtime = 0;
  95 static quote_func_t quote_func = name_quote;
  96 static gboolean run_view = FALSE;
  97 static gboolean is_cd = FALSE;
  98 static gboolean written_nonspace = FALSE;
  99 static gboolean do_local_copy = FALSE;
 100
 101 /*** file scope functions ************************************************************************/
 102 /* --------------------------------------------------------------------------------------------- */
 103
 104 static void
 105 exec_cleanup_file_name (const vfs_path_t * filename_vpath, gboolean has_changed)
 106 {
 107     if (localfilecopy_vpath == NULL)
 108         return;
 109
 110     if (has_changed)
 111     {
 112         struct stat mystat;
 113
 114         mc_stat (localfilecopy_vpath, &mystat);
 115         has_changed = localmtime != mystat.st_mtime;
 116     }
 117     mc_ungetlocalcopy (filename_vpath, localfilecopy_vpath, has_changed);
 118     vfs_path_free (localfilecopy_vpath);
 119     localfilecopy_vpath = NULL;
 120 }
 121
 122 /* --------------------------------------------------------------------------------------------- */
 123
 124 static char *
 125 exec_get_file_name (const vfs_path_t * filename_vpath)
 126 {
 127     if (!do_local_copy)
 128         return quote_func (vfs_path_get_last_path_str (filename_vpath), 0);
 129
 130     if (localfilecopy_vpath == NULL)
 131     {
 132         struct stat mystat;
 133         localfilecopy_vpath = mc_getlocalcopy (filename_vpath);
 134         if (localfilecopy_vpath == NULL)
 135             return NULL;
 136
 137         mc_stat (localfilecopy_vpath, &mystat);
 138         localmtime = mystat.st_mtime;
 139     }
 140
 141     return quote_func (vfs_path_get_last_path_str (localfilecopy_vpath), 0);
 142 }
 143
 144 /* --------------------------------------------------------------------------------------------- */
 145 static char *
 146 exec_expand_format (char symbol, gboolean is_result_quoted)
 147 {
 148     char *text;
 149
 150     text = expand_format (NULL, symbol, TRUE);
 151     if (is_result_quoted && text != NULL)
 152     {
 153         char *quoted_text;
 154
 155         quoted_text = g_strdup_printf ("\"%s\"", text);
 156         g_free (text);
 157         text = quoted_text;
 158     }
 159     return text;
 160 }
 161
 162 /* --------------------------------------------------------------------------------------------- */
 163
 164 static char *
 165 exec_get_export_variables (const vfs_path_t * filename_vpath)
 166 {
 167     char *text;
 168     GString *export_vars_string;
 169     size_t i;
 170
 171     /* *INDENT-OFF* */
 172     struct
 173     {
 174         const char symbol;
 175         const char *name;
 176         const gboolean is_result_quoted;
 177     } export_variables[] = {
 178         {'p', "MC_EXT_BASENAME", FALSE},
 179         {'d', "MC_EXT_CURRENTDIR", FALSE},
 180         {'s', "MC_EXT_SELECTED", TRUE},
 181         {'t', "MC_EXT_ONLYTAGGED", TRUE},
 182         {'\0', NULL, FALSE}
 183     };
 184     /* *INDENT-ON* */
 185
 186     text = exec_get_file_name (filename_vpath);
 187     if (text == NULL)
 188         return NULL;
 189
 190     export_vars_string = g_string_new ("MC_EXT_FILENAME=");
 191     g_string_append_printf (export_vars_string, "%s\nexport MC_EXT_FILENAME\n", text);
 192     g_free (text);
 193
 194     for (i = 0; export_variables[i].name != NULL; i++)
 195     {
 196         text =
 197             exec_expand_format (export_variables[i].symbol, export_variables[i].is_result_quoted);
 198         if (text != NULL)
 199         {
 200             g_string_append_printf (export_vars_string,
 201                                     "%s=%s\nexport %s\n", export_variables[i].name, text,
 202                                     export_variables[i].name);
 203             g_free (text);
 204         }
 205     }
 206     return g_string_free (export_vars_string, FALSE);
 207 }
 208
 209 /* --------------------------------------------------------------------------------------------- */
 210
 211 static char *
 212 exec_make_shell_string (const char *lc_data, const vfs_path_t * filename_vpath)
 213 {
 214     GString *shell_string;
 215     char lc_prompt[80] = "\0";
 216     gboolean parameter_found = FALSE;
 217     gboolean expand_prefix_found = FALSE;
 218
 219     shell_string = g_string_new ("");
 220
 221     for (; *lc_data != '\0' && *lc_data != '\n'; lc_data++)
 222     {
 223         if (parameter_found)
 224         {
 225             if (*lc_data == '}')
 226             {
 227                 char *parameter;
 228
 229                 parameter_found = FALSE;
 230                 parameter =
 231                     input_dialog (_("Parameter"), lc_prompt, MC_HISTORY_EXT_PARAMETER, "",
 232                                   INPUT_COMPLETE_NONE);
 233                 if (parameter == NULL)
 234                 {
 235                     /* User canceled */
 236                     g_string_free (shell_string, TRUE);
 237                     exec_cleanup_file_name (filename_vpath, FALSE);
 238                     return NULL;
 239                 }
 240                 g_string_append (shell_string, parameter);
 241                 written_nonspace = TRUE;
 242                 g_free (parameter);
 243             }
 244             else
 245             {
 246                 size_t len = strlen (lc_prompt);
 247
 248                 if (len < sizeof (lc_prompt) - 1)
 249                 {
 250                     lc_prompt[len] = *lc_data;
 251                     lc_prompt[len + 1] = '\0';
 252                 }
 253             }
 254         }
 255         else if (expand_prefix_found)
 256         {
 257             expand_prefix_found = FALSE;
 258             if (*lc_data == '{')
 259                 parameter_found = TRUE;
 260             else
 261             {
 262                 int i;
 263                 char *v;
 264
 265                 i = check_format_view (lc_data);
 266                 if (i != 0)
 267                 {
 268                     lc_data += i - 1;
 269                     run_view = TRUE;
 270                 }
 271                 else
 272                 {
 273                     i = check_format_cd (lc_data);
 274                     if (i > 0)
 275                     {
 276                         is_cd = TRUE;
 277                         quote_func = fake_name_quote;
 278                         do_local_copy = FALSE;
 279                         pbuffer = buffer;
 280                         lc_data += i - 1;
 281                     }
 282                     else
 283                     {
 284                         i = check_format_var (lc_data, &v);
 285                         if (i > 0 && v != NULL)
 286                         {
 287                             g_string_append (shell_string, v);
 288                             g_free (v);
 289                             lc_data += i;
 290                         }
 291                         else
 292                         {
 293                             char *text;
 294
 295                             if (*lc_data != 'f')
 296                                 text = expand_format (NULL, *lc_data, !is_cd);
 297                             else
 298                             {
 299                                 text = exec_get_file_name (filename_vpath);
 300                                 if (text == NULL)
 301                                 {
 302                                     g_string_free (shell_string, TRUE);
 303                                     return NULL;
 304                                 }
 305                             }
 306
 307                             if (!is_cd)
 308                                 g_string_append (shell_string, text);
 309                             else
 310                             {
 311                                 strcpy (pbuffer, text);
 312                                 pbuffer = strchr (pbuffer, 0);
 313                             }
 314
 315                             g_free (text);
 316                             written_nonspace = TRUE;
 317                         }
 318                     }
 319                 }
 320             }
 321         }
 322         else if (*lc_data == '%')
 323             expand_prefix_found = TRUE;
 324         else
 325         {
 326             if (*lc_data != ' ' && *lc_data != '\t')
 327                 written_nonspace = TRUE;
 328             if (is_cd)
 329                 *(pbuffer++) = *lc_data;
 330             else
 331                 g_string_append_c (shell_string, *lc_data);
 332         }
 333     }                           /* for */
 334     return g_string_free (shell_string, FALSE);
 335 }
 336
 337 /* --------------------------------------------------------------------------------------------- */
 338
 339 static void
 340 exec_extension_view (char *cmd, const vfs_path_t * filename_vpath, int start_line)
 341 {
 342     int def_hex_mode = mcview_default_hex_mode, changed_hex_mode = 0;
 343     int def_nroff_flag = mcview_default_nroff_flag, changed_nroff_flag = 0;
 344
 345     mcview_altered_hex_mode = 0;
 346     mcview_altered_nroff_flag = 0;
 347     if (def_hex_mode != mcview_default_hex_mode)
 348         changed_hex_mode = 1;
 349     if (def_nroff_flag != mcview_default_nroff_flag)
 350         changed_nroff_flag = 1;
 351
 352     mcview_viewer (cmd, filename_vpath, start_line);
 353
 354     if (changed_hex_mode && !mcview_altered_hex_mode)
 355         mcview_default_hex_mode = def_hex_mode;
 356     if (changed_nroff_flag && !mcview_altered_nroff_flag)
 357         mcview_default_nroff_flag = def_nroff_flag;
 358
 359     dialog_switch_process_pending ();
 360 }
 361
 362 /* --------------------------------------------------------------------------------------------- */
 363
 364 static void
 365 exec_extension_cd (void)
 366 {
 367     char *q;
 368     vfs_path_t *p_vpath;
 369
 370     *pbuffer = '\0';
 371     pbuffer = buffer;
 372     /*      while (*p == ' ' && *p == '\t')
 373      *          p++;
 374      */
 375     /* Search last non-space character. Start search at the end in order
 376        not to short filenames containing spaces. */
 377     q = pbuffer + strlen (pbuffer) - 1;
 378     while (q >= pbuffer && (*q == ' ' || *q == '\t'))
 379         q--;
 380     q[1] = 0;
 381
 382     p_vpath = vfs_path_from_str_flags (pbuffer, VPF_NO_CANON);
 383     do_cd (p_vpath, cd_parse_command);
 384     vfs_path_free (p_vpath);
 385 }
 386
 387
 388 /* --------------------------------------------------------------------------------------------- */
 389
 390 static void
 391 exec_extension (const vfs_path_t * filename_vpath, const char *lc_data, int start_line)
 392 {
 393     char *shell_string, *export_variables;
 394     vfs_path_t *temp_file_name_vpath = NULL;
 395     int cmd_file_fd;
 396     FILE *cmd_file;
 397     char *cmd = NULL;
 398
 399     g_return_if_fail (lc_data != NULL);
 400
 401     pbuffer = NULL;
 402     localmtime = 0;
 403     quote_func = name_quote;
 404     run_view = FALSE;
 405     is_cd = FALSE;
 406     written_nonspace = FALSE;
 407
 408     /* Avoid making a local copy if we are doing a cd */
 409     do_local_copy = !vfs_file_is_local (filename_vpath);
 410
 411     shell_string = exec_make_shell_string (lc_data, filename_vpath);
 412
 413     if (shell_string == NULL)
 414         goto ret;
 415
 416     if (is_cd)
 417     {
 418         exec_extension_cd ();
 419         g_free (shell_string);
 420         goto ret;
 421     }
 422
 423     /*
 424      * All commands should be run in /bin/sh regardless of user shell.
 425      * To do that, create temporary shell script and run it.
 426      * Sometimes it's not needed (e.g. for %cd and %view commands),
 427      * but it's easier to create it anyway.
 428      */
 429     cmd_file_fd = mc_mkstemps (&temp_file_name_vpath, "mcext", SCRIPT_SUFFIX);
 430
 431     if (cmd_file_fd == -1)
 432     {
 433         message (D_ERROR, MSG_ERROR,
 434                  _("Cannot create temporary command file\n%s"), unix_error_string (errno));
 435         goto ret;
 436     }
 437
 438     cmd_file = fdopen (cmd_file_fd, "w");
 439     fputs ("#! /bin/sh\n\n", cmd_file);
 440
 441     export_variables = exec_get_export_variables (filename_vpath);
 442     if (export_variables != NULL)
 443     {
 444         fprintf (cmd_file, "%s\n", export_variables);
 445         g_free (export_variables);
 446     }
 447
 448     fputs (shell_string, cmd_file);
 449     g_free (shell_string);
 450
 451     /*
 452      * Make the script remove itself when it finishes.
 453      * Don't do it for the viewer - it may need to rerun the script,
 454      * so we clean up after calling view().
 455      */
 456     if (!run_view)
 457     {
 458         char *file_name;
 459
 460         file_name = vfs_path_to_str (temp_file_name_vpath);
 461         fprintf (cmd_file, "\n/bin/rm -f %s\n", file_name);
 462         g_free (file_name);
 463     }
 464
 465     fclose (cmd_file);
 466
 467     if ((run_view && !written_nonspace) || is_cd)
 468     {
 469         mc_unlink (temp_file_name_vpath);
 470         vfs_path_free (temp_file_name_vpath);
 471         temp_file_name_vpath = NULL;
 472     }
 473     else
 474     {
 475         char *file_name;
 476
 477         file_name = vfs_path_to_str (temp_file_name_vpath);
 478         /* Set executable flag on the command file ... */
 479         mc_chmod (temp_file_name_vpath, S_IRWXU);
 480         /* ... but don't rely on it - run /bin/sh explicitly */
 481         cmd = g_strconcat ("/bin/sh ", file_name, (char *) NULL);
 482         g_free (file_name);
 483     }
 484
 485     if (run_view)
 486     {
 487         /* If we've written whitespace only, then just load filename into view */
 488         if (!written_nonspace)
 489             exec_extension_view (NULL, filename_vpath, start_line);
 490         else
 491         {
 492             exec_extension_view (cmd, filename_vpath, start_line);
 493             mc_unlink (temp_file_name_vpath);
 494         }
 495     }
 496     else
 497     {
 498         shell_execute (cmd, EXECUTE_INTERNAL);
 499         if (mc_global.tty.console_flag != '\0')
 500         {
 501             handle_console (CONSOLE_SAVE);
 502             if (output_lines && mc_global.keybar_visible)
 503                 show_console_contents (output_start_y,
 504                                        LINES - mc_global.keybar_visible -
 505                                        output_lines - 1, LINES - mc_global.keybar_visible - 1);
 506         }
 507     }
 508
 509     g_free (cmd);
 510
 511     exec_cleanup_file_name (filename_vpath, TRUE);
 512   ret:
 513     vfs_path_free (temp_file_name_vpath);
 514 }
 515
 516 /* --------------------------------------------------------------------------------------------- */
 517 /**
 518  * Run cmd_file with args, put result into buf.
 519  * If error, put '\0' into buf[0]
 520  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 521  *
 522  * NOTES: buf is null-terminated string.
 523  */
 524
 525 static int
 526 get_popen_information (const char *cmd_file, const char *args, char *buf, int buflen)
 527 {
 528     gboolean read_bytes = FALSE;
 529     char *command;
 530     FILE *f;
 531
 532     command = g_strconcat (cmd_file, args, " 2>/dev/null", (char *) NULL);
 533     f = popen (command, "r");
 534     g_free (command);
 535
 536     if (f != NULL)
 537     {
 538 #ifdef __QNXNTO__
 539         if (setvbuf (f, NULL, _IOFBF, 0) != 0)
 540         {
 541             (void) pclose (f);
 542             return -1;
 543         }
 544 #endif
 545         read_bytes = (fgets (buf, buflen, f) != NULL);
 546         if (!read_bytes)
 547             buf[0] = '\0';      /* Paranoid termination */
 548         pclose (f);
 549     }
 550     else
 551     {
 552         buf[0] = '\0';          /* Paranoid termination */
 553         return -1;
 554     }
 555
 556     buf[buflen - 1] = '\0';
 557
 558     return read_bytes ? 1 : 0;
 559 }
 560
 561 /* --------------------------------------------------------------------------------------------- */
 562 /**
 563  * Run the "file" command on the local file.
 564  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 565  */
 566
 567 static int
 568 get_file_type_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 569 {
 570     char *tmp;
 571     int ret;
 572
 573     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 574     ret = get_popen_information (FILE_CMD, tmp, buf, buflen);
 575     g_free (tmp);
 576
 577     return ret;
 578 }
 579
 580 /* --------------------------------------------------------------------------------------------- */
 581 /**
 582  * Run the "enca" command on the local file.
 583  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 584  */
 585
 586 #ifdef HAVE_CHARSET
 587 static int
 588 get_file_encoding_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 589 {
 590     char *tmp, *lang, *args;
 591     int ret;
 592
 593     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 594     lang = name_quote (autodetect_codeset, 0);
 595     args = g_strconcat (" -L", lang, " -i ", tmp, (char *) NULL);
 596
 597     ret = get_popen_information ("enca", args, buf, buflen);
 598
 599     g_free (args);
 600     g_free (lang);
 601     g_free (tmp);
 602
 603     return ret;
 604 }
 605 #endif /* HAVE_CHARSET */
 606
 607 /* --------------------------------------------------------------------------------------------- */
 608 /**
 609  * Invoke the "file" command on the file and match its output against PTR.
 610  * have_type is a flag that is set if we already have tried to determine
 611  * the type of that file.
 612  * Return 1 for match, 0 for no match, -1 errors.
 613  */
 614
 615 static gboolean
 616 regex_check_type (const vfs_path_t * filename_vpath, const char *ptr, int *have_type,
 617                   gboolean case_insense, GError ** error)
 618 {
 619     gboolean found = FALSE;
 620
 621     /* Following variables are valid if *have_type is 1 */
 622     static char content_string[2048];
 623 #ifdef HAVE_CHARSET
 624     static char encoding_id[21];        /* CSISO51INISCYRILLIC -- 20 */
 625 #endif
 626     static size_t content_shift = 0;
 627     static int got_data = 0;
 628
 629     if (!use_file_to_check_type)
 630         return FALSE;
 631
 632     if (*have_type == 0)
 633     {
 634         vfs_path_t *localfile_vpath;
 635         const char *realname;   /* name used with "file" */
 636
 637 #ifdef HAVE_CHARSET
 638         int got_encoding_data;
 639 #endif /* HAVE_CHARSET */
 640
 641         /* Don't repeate even unsuccessful checks */
 642         *have_type = 1;
 643
 644         localfile_vpath = mc_getlocalcopy (filename_vpath);
 645         if (localfile_vpath == NULL)
 646         {
 647             char *filename;
 648
 649             filename = vfs_path_to_str (filename_vpath);
 650             g_propagate_error (error,
 651                                g_error_new (MC_ERROR, -1,
 652                                             _("Cannot fetch a local copy of %s"), filename));
 653             g_free (filename);
 654             return FALSE;
 655         }
 656
 657         realname = vfs_path_get_last_path_str (localfile_vpath);
 658
 659 #ifdef HAVE_CHARSET
 660         got_encoding_data = is_autodetect_codeset_enabled
 661             ? get_file_encoding_local (localfile_vpath, encoding_id, sizeof (encoding_id)) : 0;
 662
 663         if (got_encoding_data > 0)
 664         {
 665             char *pp;
 666             int cp_id;
 667
 668             pp = strchr (encoding_id, '\n');
 669             if (pp != NULL)
 670                 *pp = '\0';
 671
 672             cp_id = get_codepage_index (encoding_id);
 673             if (cp_id == -1)
 674                 cp_id = default_source_codepage;
 675
 676             do_set_codepage (cp_id);
 677         }
 678 #endif /* HAVE_CHARSET */
 679
 680         mc_ungetlocalcopy (filename_vpath, localfile_vpath, FALSE);
 681
 682         got_data = get_file_type_local (localfile_vpath, content_string, sizeof (content_string));
 683
 684         if (got_data > 0)
 685         {
 686             char *pp;
 687             size_t real_len;
 688
 689             pp = strchr (content_string, '\n');
 690             if (pp != NULL)
 691                 *pp = '\0';
 692
 693             real_len = strlen (realname);
 694
 695             if (strncmp (content_string, realname, real_len) == 0)
 696             {
 697                 /* Skip "realname: " */
 698                 content_shift = real_len;
 699                 if (content_string[content_shift] == ':')
 700                 {
 701                     /* Solaris' file prints tab(s) after ':' */
 702                     for (content_shift++;
 703                          content_string[content_shift] == ' '
 704                          || content_string[content_shift] == '\t'; content_shift++)
 705                         ;
 706                 }
 707             }
 708         }
 709         else
 710         {
 711             /* No data */
 712             content_string[0] = '\0';
 713         }
 714         vfs_path_free (localfile_vpath);
 715     }
 716
 717     if (got_data == -1)
 718     {
 719         g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Pipe failed")));
 720         return FALSE;
 721     }
 722
 723     if (content_string[0] != '\0')
 724     {
 725         mc_search_t *search;
 726
 727         search = mc_search_new (ptr, -1);
 728         if (search != NULL)
 729         {
 730             search->search_type = MC_SEARCH_T_REGEX;
 731             search->is_case_sensitive = !case_insense;
 732             found = mc_search_run (search, content_string + content_shift, 0, -1, NULL);
 733             mc_search_free (search);
 734         }
 735         else
 736         {
 737             g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Regular expression error")));
 738         }
 739     }
 740
 741     return found;
 742 }
 743
 744 /* --------------------------------------------------------------------------------------------- */
 745 /*** public functions ****************************************************************************/
 746 /* --------------------------------------------------------------------------------------------- */
 747
 748 void
 749 flush_extension_file (void)
 750 {
 751     g_free (data);
 752     data = NULL;
 753 }
 754
 755 /* --------------------------------------------------------------------------------------------- */
 756 /**
 757  * The second argument is action, i.e. Open, View or Edit
 758  *
 759  * This function returns:
 760  *
 761  * -1 for a failure or user interrupt
 762  * 0 if no command was run
 763  * 1 if some command was run
 764  *
 765  * If action == "View" then a parameter is checked in the form of "View:%d",
 766  * if the value for %d exists, then the viewer is started up at that line number.
 767  */
 768
 769 int
 770 regex_command (const vfs_path_t * filename_vpath, const char *action)
 771 {
 772     char *filename, *p, *q, *r, c;
 773     size_t file_len;
 774     gboolean found = FALSE;
 775     gboolean error_flag = FALSE;
 776     int ret = 0;
 777     struct stat mystat;
 778     int view_at_line_number;
 779     char *include_target;
 780     int include_target_len;
 781     int have_type = 0;          /* Flag used by regex_check_type() */
 782
 783     if (filename_vpath == NULL)
 784         return 0;
 785
 786     /* Check for the special View:%d parameter */
 787     if (strncmp (action, "View:", 5) == 0)
 788     {
 789         view_at_line_number = atoi (action + 5);
 790         action = "View";
 791     }
 792     else
 793     {
 794         view_at_line_number = 0;
 795     }
 796
 797     if (data == NULL)
 798     {
 799         char *extension_file;
 800         gboolean mc_user_ext = TRUE;
 801         gboolean home_error = FALSE;
 802
 803         extension_file = mc_config_get_full_path (MC_FILEBIND_FILE);
 804         if (!exist_file (extension_file))
 805         {
 806             g_free (extension_file);
 807           check_stock_mc_ext:
 808             extension_file = mc_build_filename (mc_global.sysconfig_dir, MC_LIB_EXT, NULL);
 809             if (!exist_file (extension_file))
 810             {
 811                 g_free (extension_file);
 812                 extension_file = mc_build_filename (mc_global.share_data_dir, MC_LIB_EXT, NULL);
 813             }
 814             mc_user_ext = FALSE;
 815         }
 816
 817         g_file_get_contents (extension_file, &data, NULL, NULL);
 818         g_free (extension_file);
 819         if (data == NULL)
 820             return 0;
 821
 822         if (strstr (data, "default/") == NULL)
 823         {
 824             if (strstr (data, "regex/") == NULL && strstr (data, "shell/") == NULL &&
 825                 strstr (data, "type/") == NULL)
 826             {
 827                 g_free (data);
 828                 data = NULL;
 829
 830                 if (!mc_user_ext)
 831                 {
 832                     char *title;
 833
 834                     title = g_strdup_printf (_(" %s%s file error"),
 835                                              mc_global.sysconfig_dir, MC_LIB_EXT);
 836                     message (D_ERROR, title, _("The format of the %smc.ext "
 837                                                "file has changed with version 3.0. It seems that "
 838                                                "the installation failed. Please fetch a fresh "
 839                                                "copy from the Midnight Commander package."),
 840                              mc_global.sysconfig_dir);
 841                     g_free (title);
 842                     return 0;
 843                 }
 844
 845                 home_error = TRUE;
 846                 goto check_stock_mc_ext;
 847             }
 848         }
 849
 850         if (home_error)
 851         {
 852             char *filebind_filename;
 853             char *title;
 854
 855             filebind_filename = mc_config_get_full_path (MC_FILEBIND_FILE);
 856             title = g_strdup_printf (_("%s file error"), filebind_filename);
 857             message (D_ERROR, title,
 858                      _("The format of the %s file has "
 859                        "changed with version 3.0. You may either want to copy "
 860                        "it from %smc.ext or use that file as an example of how to write it."),
 861                      filebind_filename, mc_global.sysconfig_dir);
 862             g_free (filebind_filename);
 863             g_free (title);
 864         }
 865     }
 866
 867     mc_stat (filename_vpath, &mystat);
 868
 869     include_target = NULL;
 870     include_target_len = 0;
 871     filename = vfs_path_to_str (filename_vpath);
 872     file_len = vfs_path_len (filename_vpath);
 873
 874     for (p = data; *p != '\0'; p++)
 875     {
 876         for (q = p; *q == ' ' || *q == '\t'; q++)
 877             ;
 878         if (*q == '\n' || *q == '\0')
 879             p = q;              /* empty line */
 880         if (*p == '#')          /* comment */
 881             while (*p != '\0' && *p != '\n')
 882                 p++;
 883         if (*p == '\n')
 884             continue;
 885         if (*p == '\0')
 886             break;
 887         if (p == q)
 888         {                       /* i.e. starts in the first column, should be
 889                                  * keyword/descNL
 890                                  */
 891             gboolean case_insense;
 892
 893             found = FALSE;
 894             q = strchr (p, '\n');
 895             if (q == NULL)
 896                 q = strchr (p, '\0');
 897             c = *q;
 898             *q = '\0';
 899             if (include_target)
 900             {
 901                 if ((strncmp (p, "include/", 8) == 0)
 902                     && (strncmp (p + 8, include_target, include_target_len) == 0))
 903                     found = TRUE;
 904             }
 905             else if (strncmp (p, "regex/", 6) == 0)
 906             {
 907                 mc_search_t *search;
 908
 909                 p += 6;
 910                 case_insense = (strncmp (p, "i/", 2) == 0);
 911                 if (case_insense)
 912                     p += 2;
 913
 914                 search = mc_search_new (p, -1);
 915                 if (search != NULL)
 916                 {
 917                     search->search_type = MC_SEARCH_T_REGEX;
 918                     search->is_case_sensitive = !case_insense;
 919                     found = mc_search_run (search, filename, 0, file_len, NULL);
 920                     mc_search_free (search);
 921                 }
 922             }
 923             else if (strncmp (p, "directory/", 10) == 0)
 924             {
 925                 if (S_ISDIR (mystat.st_mode) && mc_search (p + 10, filename, MC_SEARCH_T_REGEX))
 926                     found = TRUE;
 927             }
 928             else if (strncmp (p, "shell/", 6) == 0)
 929             {
 930                 int (*cmp_func) (const char *s1, const char *s2, size_t n) = strncmp;
 931
 932                 p += 6;
 933                 case_insense = (strncmp (p, "i/", 2) == 0);
 934                 if (case_insense)
 935                 {
 936                     p += 2;
 937                     cmp_func = strncasecmp;
 938                 }
 939
 940                 if (*p == '.' && file_len >= (size_t) (q - p))
 941                 {
 942                     if (cmp_func (p, filename + file_len - (q - p), q - p) == 0)
 943                         found = TRUE;
 944                 }
 945                 else
 946                 {
 947                     if ((size_t) (q - p) == file_len && cmp_func (p, filename, q - p) == 0)
 948                         found = TRUE;
 949                 }
 950             }
 951             else if (strncmp (p, "type/", 5) == 0)
 952             {
 953                 GError *error = NULL;
 954
 955                 p += 5;
 956
 957                 case_insense = (strncmp (p, "i/", 2) == 0);
 958                 if (case_insense)
 959                     p += 2;
 960
 961                 found = regex_check_type (filename_vpath, p, &have_type, case_insense, &error);
 962                 if (error != NULL)
 963                 {
 964                     g_error_free (error);
 965                     error_flag = TRUE;  /* leave it if file cannot be opened */
 966                 }
 967             }
 968             else if (strncmp (p, "default/", 8) == 0)
 969                 found = TRUE;
 970
 971             *q = c;
 972             p = q;
 973             if (*p == '\0')
 974                 break;
 975         }
 976         else
 977         {                       /* List of actions */
 978             p = q;
 979             q = strchr (p, '\n');
 980             if (q == NULL)
 981                 q = strchr (p, '\0');
 982             if (found && !error_flag)
 983             {
 984                 r = strchr (p, '=');
 985                 if (r != NULL)
 986                 {
 987                     c = *r;
 988                     *r = '\0';
 989                     if (strcmp (p, "Include") == 0)
 990                     {
 991                         char *t;
 992
 993                         include_target = p + 8;
 994                         t = strchr (include_target, '\n');
 995                         if (t != NULL)
 996                             *t = '\0';
 997                         include_target_len = strlen (include_target);
 998                         if (t != NULL)
 999                             *t = '\n';
1000
1001                         *r = c;
1002                         p = q;
1003                         found = FALSE;
1004
1005                         if (*p == '\0')
1006                             break;
1007                         continue;
1008                     }
1009
1010                     if (strcmp (action, p) != 0)
1011                         *r = c;
1012                     else
1013                     {
1014                         *r = c;
1015
1016                         for (p = r + 1; *p == ' ' || *p == '\t'; p++)
1017                             ;
1018
1019                         /* Empty commands just stop searching
1020                          * through, they don't do anything
1021                          */
1022                         if (p < q)
1023                         {
1024                             exec_extension (filename_vpath, r + 1, view_at_line_number);
1025                             ret = 1;
1026                         }
1027                         break;
1028                     }
1029                 }
1030             }
1031             p = q;
1032             if (*p == '\0')
1033                 break;
1034         }
1035     }
1036     g_free (filename);
1037     if (error_flag)
1038         ret = -1;
1039     return ret;
1040 }
1041
1042 /* --------------------------------------------------------------------------------------------- */