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 = input_dialog (_("Parameter"), lc_prompt, MC_HISTORY_EXT_PARAMETER, "");
 231                 if (parameter == NULL)
 232                 {
 233                     /* User canceled */
 234                     g_string_free (shell_string, TRUE);
 235                     exec_cleanup_file_name (filename_vpath, FALSE);
 236                     return NULL;
 237                 }
 238                 g_string_append (shell_string, parameter);
 239                 written_nonspace = TRUE;
 240                 g_free (parameter);
 241             }
 242             else
 243             {
 244                 size_t len = strlen (lc_prompt);
 245
 246                 if (len < sizeof (lc_prompt) - 1)
 247                 {
 248                     lc_prompt[len] = *lc_data;
 249                     lc_prompt[len + 1] = '\0';
 250                 }
 251             }
 252         }
 253         else if (expand_prefix_found)
 254         {
 255             expand_prefix_found = FALSE;
 256             if (*lc_data == '{')
 257                 parameter_found = TRUE;
 258             else
 259             {
 260                 int i;
 261                 char *v;
 262
 263                 i = check_format_view (lc_data);
 264                 if (i != 0)
 265                 {
 266                     lc_data += i - 1;
 267                     run_view = TRUE;
 268                 }
 269                 else
 270                 {
 271                     i = check_format_cd (lc_data);
 272                     if (i > 0)
 273                     {
 274                         is_cd = TRUE;
 275                         quote_func = fake_name_quote;
 276                         do_local_copy = FALSE;
 277                         pbuffer = buffer;
 278                         lc_data += i - 1;
 279                     }
 280                     else
 281                     {
 282                         i = check_format_var (lc_data, &v);
 283                         if (i > 0 && v != NULL)
 284                         {
 285                             g_string_append (shell_string, v);
 286                             g_free (v);
 287                             lc_data += i;
 288                         }
 289                         else
 290                         {
 291                             char *text;
 292
 293                             if (*lc_data != 'f')
 294                                 text = expand_format (NULL, *lc_data, !is_cd);
 295                             else
 296                             {
 297                                 text = exec_get_file_name (filename_vpath);
 298                                 if (text == NULL)
 299                                 {
 300                                     g_string_free (shell_string, TRUE);
 301                                     return NULL;
 302                                 }
 303                             }
 304
 305                             if (!is_cd)
 306                                 g_string_append (shell_string, text);
 307                             else
 308                             {
 309                                 strcpy (pbuffer, text);
 310                                 pbuffer = strchr (pbuffer, 0);
 311                             }
 312
 313                             g_free (text);
 314                             written_nonspace = TRUE;
 315                         }
 316                     }
 317                 }
 318             }
 319         }
 320         else if (*lc_data == '%')
 321             expand_prefix_found = TRUE;
 322         else
 323         {
 324             if (*lc_data != ' ' && *lc_data != '\t')
 325                 written_nonspace = TRUE;
 326             if (is_cd)
 327                 *(pbuffer++) = *lc_data;
 328             else
 329                 g_string_append_c (shell_string, *lc_data);
 330         }
 331     }                           /* for */
 332     return g_string_free (shell_string, FALSE);
 333 }
 334
 335 /* --------------------------------------------------------------------------------------------- */
 336
 337 static void
 338 exec_extension_view (char *cmd, const vfs_path_t * filename_vpath, int start_line,
 339                      vfs_path_t * temp_file_name_vpath)
 340 {
 341     int def_hex_mode = mcview_default_hex_mode, changed_hex_mode = 0;
 342     int def_nroff_flag = mcview_default_nroff_flag, changed_nroff_flag = 0;
 343
 344     mcview_altered_hex_mode = 0;
 345     mcview_altered_nroff_flag = 0;
 346     if (def_hex_mode != mcview_default_hex_mode)
 347         changed_hex_mode = 1;
 348     if (def_nroff_flag != mcview_default_nroff_flag)
 349         changed_nroff_flag = 1;
 350
 351     /* If we've written whitespace only, then just load filename
 352      * into view
 353      */
 354     if (written_nonspace)
 355     {
 356         mcview_viewer (cmd, filename_vpath, start_line);
 357         mc_unlink (temp_file_name_vpath);
 358     }
 359     else
 360         mcview_viewer (NULL, filename_vpath, start_line);
 361
 362     if (changed_hex_mode && !mcview_altered_hex_mode)
 363         mcview_default_hex_mode = def_hex_mode;
 364     if (changed_nroff_flag && !mcview_altered_nroff_flag)
 365         mcview_default_nroff_flag = def_nroff_flag;
 366
 367     dialog_switch_process_pending ();
 368 }
 369
 370 /* --------------------------------------------------------------------------------------------- */
 371
 372 static void
 373 exec_extension_cd (void)
 374 {
 375     char *q;
 376     vfs_path_t *p_vpath;
 377
 378     *pbuffer = '\0';
 379     pbuffer = buffer;
 380     /*      while (*p == ' ' && *p == '\t')
 381      *          p++;
 382      */
 383     /* Search last non-space character. Start search at the end in order
 384        not to short filenames containing spaces. */
 385     q = pbuffer + strlen (pbuffer) - 1;
 386     while (q >= pbuffer && (*q == ' ' || *q == '\t'))
 387         q--;
 388     q[1] = 0;
 389
 390     p_vpath = vfs_path_from_str_flags (pbuffer, VPF_NO_CANON);
 391     do_cd (p_vpath, cd_parse_command);
 392     vfs_path_free (p_vpath);
 393 }
 394
 395
 396 /* --------------------------------------------------------------------------------------------- */
 397
 398 static void
 399 exec_extension (const vfs_path_t * filename_vpath, const char *lc_data, int start_line)
 400 {
 401     char *shell_string, *export_variables;
 402     vfs_path_t *temp_file_name_vpath = NULL;
 403     int cmd_file_fd;
 404     FILE *cmd_file;
 405     char *cmd = NULL;
 406
 407     g_return_if_fail (lc_data != NULL);
 408
 409     pbuffer = NULL;
 410     localmtime = 0;
 411     quote_func = name_quote;
 412     run_view = FALSE;
 413     is_cd = FALSE;
 414     written_nonspace = FALSE;
 415
 416     /* Avoid making a local copy if we are doing a cd */
 417     do_local_copy = !vfs_file_is_local (filename_vpath);
 418
 419     shell_string = exec_make_shell_string (lc_data, filename_vpath);
 420
 421     if (shell_string == NULL)
 422         goto ret;
 423
 424     if (is_cd)
 425     {
 426         exec_extension_cd ();
 427         g_free (shell_string);
 428         goto ret;
 429     }
 430
 431     /*
 432      * All commands should be run in /bin/sh regardless of user shell.
 433      * To do that, create temporary shell script and run it.
 434      * Sometimes it's not needed (e.g. for %cd and %view commands),
 435      * but it's easier to create it anyway.
 436      */
 437     cmd_file_fd = mc_mkstemps (&temp_file_name_vpath, "mcext", SCRIPT_SUFFIX);
 438
 439     if (cmd_file_fd == -1)
 440     {
 441         message (D_ERROR, MSG_ERROR,
 442                  _("Cannot create temporary command file\n%s"), unix_error_string (errno));
 443         goto ret;
 444     }
 445
 446     cmd_file = fdopen (cmd_file_fd, "w");
 447     fputs ("#! /bin/sh\n\n", cmd_file);
 448
 449     export_variables = exec_get_export_variables (filename_vpath);
 450     if (export_variables != NULL)
 451     {
 452         fprintf (cmd_file, "%s\n", export_variables);
 453         g_free (export_variables);
 454     }
 455
 456     fputs (shell_string, cmd_file);
 457     g_free (shell_string);
 458
 459     /*
 460      * Make the script remove itself when it finishes.
 461      * Don't do it for the viewer - it may need to rerun the script,
 462      * so we clean up after calling view().
 463      */
 464     if (!run_view)
 465     {
 466         char *file_name;
 467
 468         file_name = vfs_path_to_str (temp_file_name_vpath);
 469         fprintf (cmd_file, "\n/bin/rm -f %s\n", file_name);
 470         g_free (file_name);
 471     }
 472
 473     fclose (cmd_file);
 474
 475     if ((run_view && !written_nonspace) || is_cd)
 476     {
 477         mc_unlink (temp_file_name_vpath);
 478         vfs_path_free (temp_file_name_vpath);
 479         temp_file_name_vpath = NULL;
 480     }
 481     else
 482     {
 483         char *file_name;
 484
 485         file_name = vfs_path_to_str (temp_file_name_vpath);
 486         /* Set executable flag on the command file ... */
 487         mc_chmod (temp_file_name_vpath, S_IRWXU);
 488         /* ... but don't rely on it - run /bin/sh explicitly */
 489         cmd = g_strconcat ("/bin/sh ", file_name, (char *) NULL);
 490         g_free (file_name);
 491     }
 492
 493     if (run_view)
 494         exec_extension_view (cmd, filename_vpath, start_line, temp_file_name_vpath);
 495     else
 496     {
 497         shell_execute (cmd, EXECUTE_INTERNAL);
 498         if (mc_global.tty.console_flag != '\0')
 499         {
 500             handle_console (CONSOLE_SAVE);
 501             if (output_lines && mc_global.keybar_visible)
 502                 show_console_contents (output_start_y,
 503                                        LINES - mc_global.keybar_visible -
 504                                        output_lines - 1, LINES - mc_global.keybar_visible - 1);
 505         }
 506     }
 507
 508     g_free (cmd);
 509
 510     exec_cleanup_file_name (filename_vpath, TRUE);
 511   ret:
 512     vfs_path_free (temp_file_name_vpath);
 513 }
 514
 515 /* --------------------------------------------------------------------------------------------- */
 516 /**
 517  * Run cmd_file with args, put result into buf.
 518  * If error, put '\0' into buf[0]
 519  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 520  *
 521  * NOTES: buf is null-terminated string.
 522  */
 523
 524 static int
 525 get_popen_information (const char *cmd_file, const char *args, char *buf, int buflen)
 526 {
 527     gboolean read_bytes = FALSE;
 528     char *command;
 529     FILE *f;
 530
 531     command = g_strconcat (cmd_file, args, " 2>/dev/null", (char *) NULL);
 532     f = popen (command, "r");
 533     g_free (command);
 534
 535     if (f != NULL)
 536     {
 537 #ifdef __QNXNTO__
 538         if (setvbuf (f, NULL, _IOFBF, 0) != 0)
 539         {
 540             (void) pclose (f);
 541             return -1;
 542         }
 543 #endif
 544         read_bytes = (fgets (buf, buflen, f) != NULL);
 545         if (!read_bytes)
 546             buf[0] = '\0';      /* Paranoid termination */
 547         pclose (f);
 548     }
 549     else
 550     {
 551         buf[0] = '\0';          /* Paranoid termination */
 552         return -1;
 553     }
 554
 555     buf[buflen - 1] = '\0';
 556
 557     return read_bytes ? 1 : 0;
 558 }
 559
 560 /* --------------------------------------------------------------------------------------------- */
 561 /**
 562  * Run the "file" command on the local file.
 563  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 564  */
 565
 566 static int
 567 get_file_type_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 568 {
 569     char *tmp;
 570     int ret;
 571
 572     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 573     ret = get_popen_information (FILE_CMD, tmp, buf, buflen);
 574     g_free (tmp);
 575
 576     return ret;
 577 }
 578
 579 /* --------------------------------------------------------------------------------------------- */
 580 /**
 581  * Run the "enca" command on the local file.
 582  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 583  */
 584
 585 #ifdef HAVE_CHARSET
 586 static int
 587 get_file_encoding_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 588 {
 589     char *tmp, *lang, *args;
 590     int ret;
 591
 592     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 593     lang = name_quote (autodetect_codeset, 0);
 594     args = g_strconcat (" -L", lang, " -i ", tmp, (char *) NULL);
 595
 596     ret = get_popen_information ("enca", args, buf, buflen);
 597
 598     g_free (args);
 599     g_free (lang);
 600     g_free (tmp);
 601
 602     return ret;
 603 }
 604 #endif /* HAVE_CHARSET */
 605
 606 /* --------------------------------------------------------------------------------------------- */
 607 /**
 608  * Invoke the "file" command on the file and match its output against PTR.
 609  * have_type is a flag that is set if we already have tried to determine
 610  * the type of that file.
 611  * Return 1 for match, 0 for no match, -1 errors.
 612  */
 613
 614 static gboolean
 615 regex_check_type (const vfs_path_t * filename_vpath, const char *ptr, int *have_type,
 616                   gboolean case_insense, GError ** error)
 617 {
 618     gboolean found = FALSE;
 619
 620     /* Following variables are valid if *have_type is 1 */
 621     static char content_string[2048];
 622 #ifdef HAVE_CHARSET
 623     static char encoding_id[21];        /* CSISO51INISCYRILLIC -- 20 */
 624 #endif
 625     static size_t content_shift = 0;
 626     static int got_data = 0;
 627
 628     if (!use_file_to_check_type)
 629         return FALSE;
 630
 631     if (*have_type == 0)
 632     {
 633         vfs_path_t *localfile_vpath;
 634         const char *realname;   /* name used with "file" */
 635
 636 #ifdef HAVE_CHARSET
 637         int got_encoding_data;
 638 #endif /* HAVE_CHARSET */
 639
 640         /* Don't repeate even unsuccessful checks */
 641         *have_type = 1;
 642
 643         localfile_vpath = mc_getlocalcopy (filename_vpath);
 644         if (localfile_vpath == NULL)
 645         {
 646             char *filename;
 647
 648             filename = vfs_path_to_str (filename_vpath);
 649             g_propagate_error (error,
 650                                g_error_new (MC_ERROR, -1,
 651                                             _("Cannot fetch a local copy of %s"), filename));
 652             g_free (filename);
 653             return FALSE;
 654         }
 655
 656         realname = vfs_path_get_last_path_str (localfile_vpath);
 657
 658 #ifdef HAVE_CHARSET
 659         got_encoding_data = is_autodetect_codeset_enabled
 660             ? get_file_encoding_local (localfile_vpath, encoding_id, sizeof (encoding_id)) : 0;
 661
 662         if (got_encoding_data > 0)
 663         {
 664             char *pp;
 665             int cp_id;
 666
 667             pp = strchr (encoding_id, '\n');
 668             if (pp != NULL)
 669                 *pp = '\0';
 670
 671             cp_id = get_codepage_index (encoding_id);
 672             if (cp_id == -1)
 673                 cp_id = default_source_codepage;
 674
 675             do_set_codepage (cp_id);
 676         }
 677 #endif /* HAVE_CHARSET */
 678
 679         mc_ungetlocalcopy (filename_vpath, localfile_vpath, FALSE);
 680
 681         got_data = get_file_type_local (localfile_vpath, content_string, sizeof (content_string));
 682
 683         if (got_data > 0)
 684         {
 685             char *pp;
 686             size_t real_len;
 687
 688             pp = strchr (content_string, '\n');
 689             if (pp != NULL)
 690                 *pp = '\0';
 691
 692             real_len = strlen (realname);
 693
 694             if (strncmp (content_string, realname, real_len) == 0)
 695             {
 696                 /* Skip "realname: " */
 697                 content_shift = real_len;
 698                 if (content_string[content_shift] == ':')
 699                 {
 700                     /* Solaris' file prints tab(s) after ':' */
 701                     for (content_shift++;
 702                          content_string[content_shift] == ' '
 703                          || content_string[content_shift] == '\t'; content_shift++)
 704                         ;
 705                 }
 706             }
 707         }
 708         else
 709         {
 710             /* No data */
 711             content_string[0] = '\0';
 712         }
 713         vfs_path_free (localfile_vpath);
 714     }
 715
 716     if (got_data == -1)
 717     {
 718         g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Pipe failed")));
 719         return FALSE;
 720     }
 721
 722     if (content_string[0] != '\0')
 723     {
 724         mc_search_t *search;
 725
 726         search = mc_search_new (ptr, -1);
 727         if (search != NULL)
 728         {
 729             search->search_type = MC_SEARCH_T_REGEX;
 730             search->is_case_sensitive = !case_insense;
 731             found = mc_search_run (search, content_string + content_shift, 0, -1, NULL);
 732             mc_search_free (search);
 733         }
 734         else
 735         {
 736             g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Regular expression error")));
 737         }
 738     }
 739
 740     return found;
 741 }
 742
 743 /* --------------------------------------------------------------------------------------------- */
 744 /*** public functions ****************************************************************************/
 745 /* --------------------------------------------------------------------------------------------- */
 746
 747 void
 748 flush_extension_file (void)
 749 {
 750     g_free (data);
 751     data = NULL;
 752 }
 753
 754 /* --------------------------------------------------------------------------------------------- */
 755 /**
 756  * The second argument is action, i.e. Open, View or Edit
 757  *
 758  * This function returns:
 759  *
 760  * -1 for a failure or user interrupt
 761  * 0 if no command was run
 762  * 1 if some command was run
 763  *
 764  * If action == "View" then a parameter is checked in the form of "View:%d",
 765  * if the value for %d exists, then the viewer is started up at that line number.
 766  */
 767
 768 int
 769 regex_command (const vfs_path_t * filename_vpath, const char *action)
 770 {
 771     char *filename, *p, *q, *r, c;
 772     size_t file_len;
 773     gboolean found = FALSE;
 774     gboolean error_flag = FALSE;
 775     int ret = 0;
 776     struct stat mystat;
 777     int view_at_line_number;
 778     char *include_target;
 779     int include_target_len;
 780     int have_type = 0;          /* Flag used by regex_check_type() */
 781
 782     if (filename_vpath == NULL)
 783         return 0;
 784
 785     /* Check for the special View:%d parameter */
 786     if (strncmp (action, "View:", 5) == 0)
 787     {
 788         view_at_line_number = atoi (action + 5);
 789         action = "View";
 790     }
 791     else
 792     {
 793         view_at_line_number = 0;
 794     }
 795
 796     if (data == NULL)
 797     {
 798         char *extension_file;
 799         gboolean mc_user_ext = TRUE;
 800         gboolean home_error = FALSE;
 801
 802         extension_file = mc_config_get_full_path (MC_FILEBIND_FILE);
 803         if (!exist_file (extension_file))
 804         {
 805             g_free (extension_file);
 806           check_stock_mc_ext:
 807             extension_file = mc_build_filename (mc_global.sysconfig_dir, MC_LIB_EXT, NULL);
 808             if (!exist_file (extension_file))
 809             {
 810                 g_free (extension_file);
 811                 extension_file = mc_build_filename (mc_global.share_data_dir, MC_LIB_EXT, NULL);
 812             }
 813             mc_user_ext = FALSE;
 814         }
 815
 816         g_file_get_contents (extension_file, &data, NULL, NULL);
 817         g_free (extension_file);
 818         if (data == NULL)
 819             return 0;
 820
 821         if (strstr (data, "default/") == NULL)
 822         {
 823             if (strstr (data, "regex/") == NULL && strstr (data, "shell/") == NULL &&
 824                 strstr (data, "type/") == NULL)
 825             {
 826                 g_free (data);
 827                 data = NULL;
 828
 829                 if (!mc_user_ext)
 830                 {
 831                     char *title;
 832
 833                     title = g_strdup_printf (_(" %s%s file error"),
 834                                              mc_global.sysconfig_dir, MC_LIB_EXT);
 835                     message (D_ERROR, title, _("The format of the %smc.ext "
 836                                                "file has changed with version 3.0. It seems that "
 837                                                "the installation failed. Please fetch a fresh "
 838                                                "copy from the Midnight Commander package."),
 839                              mc_global.sysconfig_dir);
 840                     g_free (title);
 841                     return 0;
 842                 }
 843
 844                 home_error = TRUE;
 845                 goto check_stock_mc_ext;
 846             }
 847         }
 848
 849         if (home_error)
 850         {
 851             char *filebind_filename;
 852             char *title;
 853
 854             filebind_filename = mc_config_get_full_path (MC_FILEBIND_FILE);
 855             title = g_strdup_printf (_("%s file error"), filebind_filename);
 856             message (D_ERROR, title,
 857                      _("The format of the %s file has "
 858                        "changed with version 3.0. You may either want to copy "
 859                        "it from %smc.ext or use that file as an example of how to write it."),
 860                      filebind_filename, mc_global.sysconfig_dir);
 861             g_free (filebind_filename);
 862             g_free (title);
 863         }
 864     }
 865
 866     mc_stat (filename_vpath, &mystat);
 867
 868     include_target = NULL;
 869     include_target_len = 0;
 870     filename = vfs_path_to_str (filename_vpath);
 871     file_len = vfs_path_len (filename_vpath);
 872
 873     for (p = data; *p != '\0'; p++)
 874     {
 875         for (q = p; *q == ' ' || *q == '\t'; q++)
 876             ;
 877         if (*q == '\n' || *q == '\0')
 878             p = q;              /* empty line */
 879         if (*p == '#')          /* comment */
 880             while (*p != '\0' && *p != '\n')
 881                 p++;
 882         if (*p == '\n')
 883             continue;
 884         if (*p == '\0')
 885             break;
 886         if (p == q)
 887         {                       /* i.e. starts in the first column, should be
 888                                  * keyword/descNL
 889                                  */
 890             gboolean case_insense;
 891
 892             found = FALSE;
 893             q = strchr (p, '\n');
 894             if (q == NULL)
 895                 q = strchr (p, '\0');
 896             c = *q;
 897             *q = '\0';
 898             if (include_target)
 899             {
 900                 if ((strncmp (p, "include/", 8) == 0)
 901                     && (strncmp (p + 8, include_target, include_target_len) == 0))
 902                     found = TRUE;
 903             }
 904             else if (strncmp (p, "regex/", 6) == 0)
 905             {
 906                 mc_search_t *search;
 907
 908                 p += 6;
 909                 case_insense = (strncmp (p, "i/", 2) == 0);
 910                 if (case_insense)
 911                     p += 2;
 912
 913                 search = mc_search_new (p, -1);
 914                 if (search != NULL)
 915                 {
 916                     search->search_type = MC_SEARCH_T_REGEX;
 917                     search->is_case_sensitive = !case_insense;
 918                     found = mc_search_run (search, filename, 0, file_len, NULL);
 919                     mc_search_free (search);
 920                 }
 921             }
 922             else if (strncmp (p, "directory/", 10) == 0)
 923             {
 924                 if (S_ISDIR (mystat.st_mode) && mc_search (p + 10, filename, MC_SEARCH_T_REGEX))
 925                     found = TRUE;
 926             }
 927             else if (strncmp (p, "shell/", 6) == 0)
 928             {
 929                 int (*cmp_func) (const char *s1, const char *s2, size_t n) = strncmp;
 930
 931                 p += 6;
 932                 case_insense = (strncmp (p, "i/", 2) == 0);
 933                 if (case_insense)
 934                 {
 935                     p += 2;
 936                     cmp_func = strncasecmp;
 937                 }
 938
 939                 if (*p == '.' && file_len >= (size_t) (q - p))
 940                 {
 941                     if (cmp_func (p, filename + file_len - (q - p), q - p) == 0)
 942                         found = TRUE;
 943                 }
 944                 else
 945                 {
 946                     if ((size_t) (q - p) == file_len && cmp_func (p, filename, q - p) == 0)
 947                         found = TRUE;
 948                 }
 949             }
 950             else if (strncmp (p, "type/", 5) == 0)
 951             {
 952                 GError *error = NULL;
 953
 954                 p += 5;
 955
 956                 case_insense = (strncmp (p, "i/", 2) == 0);
 957                 if (case_insense)
 958                     p += 2;
 959
 960                 found = regex_check_type (filename_vpath, p, &have_type, case_insense, &error);
 961                 if (error != NULL)
 962                 {
 963                     g_error_free (error);
 964                     error_flag = TRUE;  /* leave it if file cannot be opened */
 965                 }
 966             }
 967             else if (strncmp (p, "default/", 8) == 0)
 968                 found = TRUE;
 969
 970             *q = c;
 971             p = q;
 972             if (*p == '\0')
 973                 break;
 974         }
 975         else
 976         {                       /* List of actions */
 977             p = q;
 978             q = strchr (p, '\n');
 979             if (q == NULL)
 980                 q = strchr (p, '\0');
 981             if (found && !error_flag)
 982             {
 983                 r = strchr (p, '=');
 984                 if (r != NULL)
 985                 {
 986                     c = *r;
 987                     *r = '\0';
 988                     if (strcmp (p, "Include") == 0)
 989                     {
 990                         char *t;
 991
 992                         include_target = p + 8;
 993                         t = strchr (include_target, '\n');
 994                         if (t != NULL)
 995                             *t = '\0';
 996                         include_target_len = strlen (include_target);
 997                         if (t != NULL)
 998                             *t = '\n';
 999
1000                         *r = c;
1001                         p = q;
1002                         found = FALSE;
1003
1004                         if (*p == '\0')
1005                             break;
1006                         continue;
1007                     }
1008
1009                     if (strcmp (action, p) != 0)
1010                         *r = c;
1011                     else
1012                     {
1013                         *r = c;
1014
1015                         for (p = r + 1; *p == ' ' || *p == '\t'; p++)
1016                             ;
1017
1018                         /* Empty commands just stop searching
1019                          * through, they don't do anything
1020                          */
1021                         if (p < q)
1022                         {
1023                             exec_extension (filename_vpath, r + 1, view_at_line_number);
1024                             ret = 1;
1025                         }
1026                         break;
1027                     }
1028                 }
1029             }
1030             p = q;
1031             if (*p == '\0')
1032                 break;
1033         }
1034     }
1035     g_free (filename);
1036     if (error_flag)
1037         ret = -1;
1038     return ret;
1039 }
1040
1041 /* --------------------------------------------------------------------------------------------- */