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 /* --------------------------------------------------------------------------------------------- */
 102 /*** file scope functions ************************************************************************/
 103 /* --------------------------------------------------------------------------------------------- */
 104
 105 static void
 106 exec_cleanup_script (vfs_path_t * script_vpath)
 107 {
 108     if (script_vpath != NULL)
 109     {
 110         (void) mc_unlink (script_vpath);
 111         vfs_path_free (script_vpath);
 112     }
 113 }
 114
 115 /* --------------------------------------------------------------------------------------------- */
 116
 117 static void
 118 exec_cleanup_file_name (const vfs_path_t * filename_vpath, gboolean has_changed)
 119 {
 120     if (localfilecopy_vpath == NULL)
 121         return;
 122
 123     if (has_changed)
 124     {
 125         struct stat mystat;
 126
 127         mc_stat (localfilecopy_vpath, &mystat);
 128         has_changed = localmtime != mystat.st_mtime;
 129     }
 130     mc_ungetlocalcopy (filename_vpath, localfilecopy_vpath, has_changed);
 131     vfs_path_free (localfilecopy_vpath);
 132     localfilecopy_vpath = NULL;
 133 }
 134
 135 /* --------------------------------------------------------------------------------------------- */
 136
 137 static char *
 138 exec_get_file_name (const vfs_path_t * filename_vpath)
 139 {
 140     if (!do_local_copy)
 141         return quote_func (vfs_path_get_last_path_str (filename_vpath), 0);
 142
 143     if (localfilecopy_vpath == NULL)
 144     {
 145         struct stat mystat;
 146         localfilecopy_vpath = mc_getlocalcopy (filename_vpath);
 147         if (localfilecopy_vpath == NULL)
 148             return NULL;
 149
 150         mc_stat (localfilecopy_vpath, &mystat);
 151         localmtime = mystat.st_mtime;
 152     }
 153
 154     return quote_func (vfs_path_get_last_path_str (localfilecopy_vpath), 0);
 155 }
 156
 157 /* --------------------------------------------------------------------------------------------- */
 158
 159 static char *
 160 exec_expand_format (char symbol, gboolean is_result_quoted)
 161 {
 162     char *text;
 163
 164     text = expand_format (NULL, symbol, TRUE);
 165     if (is_result_quoted && text != NULL)
 166     {
 167         char *quoted_text;
 168
 169         quoted_text = g_strdup_printf ("\"%s\"", text);
 170         g_free (text);
 171         text = quoted_text;
 172     }
 173     return text;
 174 }
 175
 176 /* --------------------------------------------------------------------------------------------- */
 177
 178 static char *
 179 exec_get_export_variables (const vfs_path_t * filename_vpath)
 180 {
 181     char *text;
 182     GString *export_vars_string;
 183     size_t i;
 184
 185     /* *INDENT-OFF* */
 186     struct
 187     {
 188         const char symbol;
 189         const char *name;
 190         const gboolean is_result_quoted;
 191     } export_variables[] = {
 192         {'p', "MC_EXT_BASENAME", FALSE},
 193         {'d', "MC_EXT_CURRENTDIR", FALSE},
 194         {'s', "MC_EXT_SELECTED", TRUE},
 195         {'t', "MC_EXT_ONLYTAGGED", TRUE},
 196         {'\0', NULL, FALSE}
 197     };
 198     /* *INDENT-ON* */
 199
 200     text = exec_get_file_name (filename_vpath);
 201     if (text == NULL)
 202         return NULL;
 203
 204     export_vars_string = g_string_new ("MC_EXT_FILENAME=");
 205     g_string_append_printf (export_vars_string, "%s\nexport MC_EXT_FILENAME\n", text);
 206     g_free (text);
 207
 208     for (i = 0; export_variables[i].name != NULL; i++)
 209     {
 210         text =
 211             exec_expand_format (export_variables[i].symbol, export_variables[i].is_result_quoted);
 212         if (text != NULL)
 213         {
 214             g_string_append_printf (export_vars_string,
 215                                     "%s=%s\nexport %s\n", export_variables[i].name, text,
 216                                     export_variables[i].name);
 217             g_free (text);
 218         }
 219     }
 220     return g_string_free (export_vars_string, FALSE);
 221 }
 222
 223 /* --------------------------------------------------------------------------------------------- */
 224
 225 static char *
 226 exec_make_shell_string (const char *lc_data, const vfs_path_t * filename_vpath)
 227 {
 228     GString *shell_string;
 229     char lc_prompt[80] = "\0";
 230     gboolean parameter_found = FALSE;
 231     gboolean expand_prefix_found = FALSE;
 232
 233     shell_string = g_string_new ("");
 234
 235     for (; *lc_data != '\0' && *lc_data != '\n'; lc_data++)
 236     {
 237         if (parameter_found)
 238         {
 239             if (*lc_data == '}')
 240             {
 241                 char *parameter;
 242
 243                 parameter_found = FALSE;
 244                 parameter =
 245                     input_dialog (_("Parameter"), lc_prompt, MC_HISTORY_EXT_PARAMETER, "",
 246                                   INPUT_COMPLETE_NONE);
 247                 if (parameter == NULL)
 248                 {
 249                     /* User canceled */
 250                     g_string_free (shell_string, TRUE);
 251                     exec_cleanup_file_name (filename_vpath, FALSE);
 252                     return NULL;
 253                 }
 254                 g_string_append (shell_string, parameter);
 255                 written_nonspace = TRUE;
 256                 g_free (parameter);
 257             }
 258             else
 259             {
 260                 size_t len = strlen (lc_prompt);
 261
 262                 if (len < sizeof (lc_prompt) - 1)
 263                 {
 264                     lc_prompt[len] = *lc_data;
 265                     lc_prompt[len + 1] = '\0';
 266                 }
 267             }
 268         }
 269         else if (expand_prefix_found)
 270         {
 271             expand_prefix_found = FALSE;
 272             if (*lc_data == '{')
 273                 parameter_found = TRUE;
 274             else
 275             {
 276                 int i;
 277                 char *v;
 278
 279                 i = check_format_view (lc_data);
 280                 if (i != 0)
 281                 {
 282                     lc_data += i - 1;
 283                     run_view = TRUE;
 284                 }
 285                 else
 286                 {
 287                     i = check_format_cd (lc_data);
 288                     if (i > 0)
 289                     {
 290                         is_cd = TRUE;
 291                         quote_func = fake_name_quote;
 292                         do_local_copy = FALSE;
 293                         pbuffer = buffer;
 294                         lc_data += i - 1;
 295                     }
 296                     else
 297                     {
 298                         i = check_format_var (lc_data, &v);
 299                         if (i > 0 && v != NULL)
 300                         {
 301                             g_string_append (shell_string, v);
 302                             g_free (v);
 303                             lc_data += i;
 304                         }
 305                         else
 306                         {
 307                             char *text;
 308
 309                             if (*lc_data != 'f')
 310                                 text = expand_format (NULL, *lc_data, !is_cd);
 311                             else
 312                             {
 313                                 text = exec_get_file_name (filename_vpath);
 314                                 if (text == NULL)
 315                                 {
 316                                     g_string_free (shell_string, TRUE);
 317                                     return NULL;
 318                                 }
 319                             }
 320
 321                             if (!is_cd)
 322                                 g_string_append (shell_string, text);
 323                             else
 324                             {
 325                                 strcpy (pbuffer, text);
 326                                 pbuffer = strchr (pbuffer, 0);
 327                             }
 328
 329                             g_free (text);
 330                             written_nonspace = TRUE;
 331                         }
 332                     }
 333                 }
 334             }
 335         }
 336         else if (*lc_data == '%')
 337             expand_prefix_found = TRUE;
 338         else
 339         {
 340             if (*lc_data != ' ' && *lc_data != '\t')
 341                 written_nonspace = TRUE;
 342             if (is_cd)
 343                 *(pbuffer++) = *lc_data;
 344             else
 345                 g_string_append_c (shell_string, *lc_data);
 346         }
 347     }                           /* for */
 348     return g_string_free (shell_string, FALSE);
 349 }
 350
 351 /* --------------------------------------------------------------------------------------------- */
 352
 353 static void
 354 exec_extension_view (void *target, char *cmd, const vfs_path_t * filename_vpath, int start_line)
 355 {
 356     int def_hex_mode = mcview_default_hex_mode, changed_hex_mode = 0;
 357     int def_nroff_flag = mcview_default_nroff_flag, changed_nroff_flag = 0;
 358
 359     (void) target;
 360
 361     mcview_altered_hex_mode = 0;
 362     mcview_altered_nroff_flag = 0;
 363     if (def_hex_mode != mcview_default_hex_mode)
 364         changed_hex_mode = 1;
 365     if (def_nroff_flag != mcview_default_nroff_flag)
 366         changed_nroff_flag = 1;
 367
 368     mcview_viewer (cmd, filename_vpath, start_line);
 369
 370     if (changed_hex_mode && !mcview_altered_hex_mode)
 371         mcview_default_hex_mode = def_hex_mode;
 372     if (changed_nroff_flag && !mcview_altered_nroff_flag)
 373         mcview_default_nroff_flag = def_nroff_flag;
 374
 375     dialog_switch_process_pending ();
 376 }
 377
 378 /* --------------------------------------------------------------------------------------------- */
 379
 380 static void
 381 exec_extension_cd (void)
 382 {
 383     char *q;
 384     vfs_path_t *p_vpath;
 385
 386     *pbuffer = '\0';
 387     pbuffer = buffer;
 388     /*      while (*p == ' ' && *p == '\t')
 389      *          p++;
 390      */
 391     /* Search last non-space character. Start search at the end in order
 392        not to short filenames containing spaces. */
 393     q = pbuffer + strlen (pbuffer) - 1;
 394     while (q >= pbuffer && (*q == ' ' || *q == '\t'))
 395         q--;
 396     q[1] = 0;
 397
 398     p_vpath = vfs_path_from_str_flags (pbuffer, VPF_NO_CANON);
 399     do_cd (p_vpath, cd_parse_command);
 400     vfs_path_free (p_vpath);
 401 }
 402
 403
 404 /* --------------------------------------------------------------------------------------------- */
 405
 406 static vfs_path_t *
 407 exec_extension (void *target, const vfs_path_t * filename_vpath, const char *lc_data, int start_line)
 408 {
 409     char *shell_string, *export_variables;
 410     vfs_path_t *script_vpath = NULL;
 411     int cmd_file_fd;
 412     FILE *cmd_file;
 413     char *cmd = NULL;
 414
 415     g_return_val_if_fail (lc_data != NULL, NULL);
 416
 417     pbuffer = NULL;
 418     localmtime = 0;
 419     quote_func = name_quote;
 420     run_view = FALSE;
 421     is_cd = FALSE;
 422     written_nonspace = FALSE;
 423
 424     /* Avoid making a local copy if we are doing a cd */
 425     do_local_copy = !vfs_file_is_local (filename_vpath);
 426
 427     shell_string = exec_make_shell_string (lc_data, filename_vpath);
 428
 429     if (shell_string == NULL)
 430         goto ret;
 431
 432     if (is_cd)
 433     {
 434         exec_extension_cd ();
 435         g_free (shell_string);
 436         goto ret;
 437     }
 438
 439     /*
 440      * All commands should be run in /bin/sh regardless of user shell.
 441      * To do that, create temporary shell script and run it.
 442      * Sometimes it's not needed (e.g. for %cd and %view commands),
 443      * but it's easier to create it anyway.
 444      */
 445     cmd_file_fd = mc_mkstemps (&script_vpath, "mcext", SCRIPT_SUFFIX);
 446
 447     if (cmd_file_fd == -1)
 448     {
 449         message (D_ERROR, MSG_ERROR,
 450                  _("Cannot create temporary command file\n%s"), unix_error_string (errno));
 451         goto ret;
 452     }
 453
 454     cmd_file = fdopen (cmd_file_fd, "w");
 455     fputs ("#! /bin/sh\n\n", cmd_file);
 456
 457     export_variables = exec_get_export_variables (filename_vpath);
 458     if (export_variables != NULL)
 459     {
 460         fprintf (cmd_file, "%s\n", export_variables);
 461         g_free (export_variables);
 462     }
 463
 464     fputs (shell_string, cmd_file);
 465     g_free (shell_string);
 466
 467     /*
 468      * Make the script remove itself when it finishes.
 469      * Don't do it for the viewer - it may need to rerun the script,
 470      * so we clean up after calling view().
 471      */
 472     if (!run_view)
 473     {
 474         char *file_name;
 475
 476         file_name = vfs_path_to_str (script_vpath);
 477         fprintf (cmd_file, "\n/bin/rm -f %s\n", file_name);
 478         g_free (file_name);
 479     }
 480
 481     fclose (cmd_file);
 482
 483     if ((run_view && !written_nonspace) || is_cd)
 484     {
 485         exec_cleanup_script (script_vpath);
 486         script_vpath = NULL;
 487     }
 488     else
 489     {
 490         char *file_name;
 491
 492         file_name = vfs_path_to_str (script_vpath);
 493         /* Set executable flag on the command file ... */
 494         mc_chmod (script_vpath, S_IRWXU);
 495         /* ... but don't rely on it - run /bin/sh explicitly */
 496         cmd = g_strconcat ("/bin/sh ", file_name, (char *) NULL);
 497         g_free (file_name);
 498     }
 499
 500     if (run_view)
 501     {
 502         /* If we've written whitespace only, then just load filename into view */
 503         if (!written_nonspace)
 504             exec_extension_view (target, NULL, filename_vpath, start_line);
 505         else
 506             exec_extension_view (target, cmd, filename_vpath, start_line);
 507     }
 508     else
 509     {
 510         shell_execute (cmd, EXECUTE_INTERNAL);
 511         if (mc_global.tty.console_flag != '\0')
 512         {
 513             handle_console (CONSOLE_SAVE);
 514             if (output_lines && mc_global.keybar_visible)
 515                 show_console_contents (output_start_y,
 516                                        LINES - mc_global.keybar_visible -
 517                                        output_lines - 1, LINES - mc_global.keybar_visible - 1);
 518         }
 519     }
 520
 521     g_free (cmd);
 522
 523     exec_cleanup_file_name (filename_vpath, TRUE);
 524   ret:
 525     return script_vpath;
 526 }
 527
 528 /* --------------------------------------------------------------------------------------------- */
 529 /**
 530  * Run cmd_file with args, put result into buf.
 531  * If error, put '\0' into buf[0]
 532  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 533  *
 534  * NOTES: buf is null-terminated string.
 535  */
 536
 537 static int
 538 get_popen_information (const char *cmd_file, const char *args, char *buf, int buflen)
 539 {
 540     gboolean read_bytes = FALSE;
 541     char *command;
 542     FILE *f;
 543
 544     command = g_strconcat (cmd_file, args, " 2>/dev/null", (char *) NULL);
 545     f = popen (command, "r");
 546     g_free (command);
 547
 548     if (f != NULL)
 549     {
 550 #ifdef __QNXNTO__
 551         if (setvbuf (f, NULL, _IOFBF, 0) != 0)
 552         {
 553             (void) pclose (f);
 554             return -1;
 555         }
 556 #endif
 557         read_bytes = (fgets (buf, buflen, f) != NULL);
 558         if (!read_bytes)
 559             buf[0] = '\0';      /* Paranoid termination */
 560         pclose (f);
 561     }
 562     else
 563     {
 564         buf[0] = '\0';          /* Paranoid termination */
 565         return -1;
 566     }
 567
 568     buf[buflen - 1] = '\0';
 569
 570     return read_bytes ? 1 : 0;
 571 }
 572
 573 /* --------------------------------------------------------------------------------------------- */
 574 /**
 575  * Run the "file" command on the local file.
 576  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 577  */
 578
 579 static int
 580 get_file_type_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 581 {
 582     char *tmp;
 583     int ret;
 584
 585     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 586     ret = get_popen_information (FILE_CMD, tmp, buf, buflen);
 587     g_free (tmp);
 588
 589     return ret;
 590 }
 591
 592 /* --------------------------------------------------------------------------------------------- */
 593 /**
 594  * Run the "enca" command on the local file.
 595  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 596  */
 597
 598 #ifdef HAVE_CHARSET
 599 static int
 600 get_file_encoding_local (const vfs_path_t * filename_vpath, char *buf, int buflen)
 601 {
 602     char *tmp, *lang, *args;
 603     int ret;
 604
 605     tmp = name_quote (vfs_path_get_last_path_str (filename_vpath), 0);
 606     lang = name_quote (autodetect_codeset, 0);
 607     args = g_strconcat (" -L", lang, " -i ", tmp, (char *) NULL);
 608
 609     ret = get_popen_information ("enca", args, buf, buflen);
 610
 611     g_free (args);
 612     g_free (lang);
 613     g_free (tmp);
 614
 615     return ret;
 616 }
 617 #endif /* HAVE_CHARSET */
 618
 619 /* --------------------------------------------------------------------------------------------- */
 620 /**
 621  * Invoke the "file" command on the file and match its output against PTR.
 622  * have_type is a flag that is set if we already have tried to determine
 623  * the type of that file.
 624  * Return 1 for match, 0 for no match, -1 errors.
 625  */
 626
 627 static gboolean
 628 regex_check_type (const vfs_path_t * filename_vpath, const char *ptr, int *have_type,
 629                   gboolean case_insense, GError ** error)
 630 {
 631     gboolean found = FALSE;
 632
 633     /* Following variables are valid if *have_type is 1 */
 634     static char content_string[2048];
 635 #ifdef HAVE_CHARSET
 636     static char encoding_id[21];        /* CSISO51INISCYRILLIC -- 20 */
 637 #endif
 638     static size_t content_shift = 0;
 639     static int got_data = 0;
 640
 641     if (!use_file_to_check_type)
 642         return FALSE;
 643
 644     if (*have_type == 0)
 645     {
 646         vfs_path_t *localfile_vpath;
 647         const char *realname;   /* name used with "file" */
 648
 649 #ifdef HAVE_CHARSET
 650         int got_encoding_data;
 651 #endif /* HAVE_CHARSET */
 652
 653         /* Don't repeate even unsuccessful checks */
 654         *have_type = 1;
 655
 656         localfile_vpath = mc_getlocalcopy (filename_vpath);
 657         if (localfile_vpath == NULL)
 658         {
 659             char *filename;
 660
 661             filename = vfs_path_to_str (filename_vpath);
 662             g_propagate_error (error,
 663                                g_error_new (MC_ERROR, -1,
 664                                             _("Cannot fetch a local copy of %s"), filename));
 665             g_free (filename);
 666             return FALSE;
 667         }
 668
 669         realname = vfs_path_get_last_path_str (localfile_vpath);
 670
 671 #ifdef HAVE_CHARSET
 672         got_encoding_data = is_autodetect_codeset_enabled
 673             ? get_file_encoding_local (localfile_vpath, encoding_id, sizeof (encoding_id)) : 0;
 674
 675         if (got_encoding_data > 0)
 676         {
 677             char *pp;
 678             int cp_id;
 679
 680             pp = strchr (encoding_id, '\n');
 681             if (pp != NULL)
 682                 *pp = '\0';
 683
 684             cp_id = get_codepage_index (encoding_id);
 685             if (cp_id == -1)
 686                 cp_id = default_source_codepage;
 687
 688             do_set_codepage (cp_id);
 689         }
 690 #endif /* HAVE_CHARSET */
 691
 692         mc_ungetlocalcopy (filename_vpath, localfile_vpath, FALSE);
 693
 694         got_data = get_file_type_local (localfile_vpath, content_string, sizeof (content_string));
 695
 696         if (got_data > 0)
 697         {
 698             char *pp;
 699             size_t real_len;
 700
 701             pp = strchr (content_string, '\n');
 702             if (pp != NULL)
 703                 *pp = '\0';
 704
 705             real_len = strlen (realname);
 706
 707             if (strncmp (content_string, realname, real_len) == 0)
 708             {
 709                 /* Skip "realname: " */
 710                 content_shift = real_len;
 711                 if (content_string[content_shift] == ':')
 712                 {
 713                     /* Solaris' file prints tab(s) after ':' */
 714                     for (content_shift++;
 715                          content_string[content_shift] == ' '
 716                          || content_string[content_shift] == '\t'; content_shift++)
 717                         ;
 718                 }
 719             }
 720         }
 721         else
 722         {
 723             /* No data */
 724             content_string[0] = '\0';
 725         }
 726         vfs_path_free (localfile_vpath);
 727     }
 728
 729     if (got_data == -1)
 730     {
 731         g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Pipe failed")));
 732         return FALSE;
 733     }
 734
 735     if (content_string[0] != '\0')
 736     {
 737         mc_search_t *search;
 738
 739         search = mc_search_new (ptr, -1);
 740         if (search != NULL)
 741         {
 742             search->search_type = MC_SEARCH_T_REGEX;
 743             search->is_case_sensitive = !case_insense;
 744             found = mc_search_run (search, content_string + content_shift, 0, -1, NULL);
 745             mc_search_free (search);
 746         }
 747         else
 748         {
 749             g_propagate_error (error, g_error_new (MC_ERROR, -1, _("Regular expression error")));
 750         }
 751     }
 752
 753     return found;
 754 }
 755
 756 /* --------------------------------------------------------------------------------------------- */
 757 /*** public functions ****************************************************************************/
 758 /* --------------------------------------------------------------------------------------------- */
 759
 760 void
 761 flush_extension_file (void)
 762 {
 763     g_free (data);
 764     data = NULL;
 765 }
 766
 767 /* --------------------------------------------------------------------------------------------- */
 768 /**
 769  * The second argument is action, i.e. Open, View or Edit
 770  * Use target object to open file in.
 771  *
 772  * This function returns:
 773  *
 774  * -1 for a failure or user interrupt
 775  * 0 if no command was run
 776  * 1 if some command was run
 777  *
 778  * If action == "View" then a parameter is checked in the form of "View:%d",
 779  * if the value for %d exists, then the viewer is started up at that line number.
 780  */
 781
 782 int
 783 regex_command_for (void *target, const vfs_path_t * filename_vpath, const char *action,
 784                    vfs_path_t ** script_vpath)
 785 {
 786     char *filename, *p, *q, *r, c;
 787     size_t file_len;
 788     gboolean found = FALSE;
 789     gboolean error_flag = FALSE;
 790     int ret = 0;
 791     struct stat mystat;
 792     int view_at_line_number;
 793     char *include_target;
 794     int include_target_len;
 795     int have_type = 0;          /* Flag used by regex_check_type() */
 796
 797     if (filename_vpath == NULL)
 798         return 0;
 799
 800     if (script_vpath != NULL)
 801         *script_vpath = NULL;
 802
 803     /* Check for the special View:%d parameter */
 804     if (strncmp (action, "View:", 5) == 0)
 805     {
 806         view_at_line_number = atoi (action + 5);
 807         action = "View";
 808     }
 809     else
 810     {
 811         view_at_line_number = 0;
 812     }
 813
 814     if (data == NULL)
 815     {
 816         char *extension_file;
 817         gboolean mc_user_ext = TRUE;
 818         gboolean home_error = FALSE;
 819
 820         extension_file = mc_config_get_full_path (MC_FILEBIND_FILE);
 821         if (!exist_file (extension_file))
 822         {
 823             g_free (extension_file);
 824           check_stock_mc_ext:
 825             extension_file = mc_build_filename (mc_global.sysconfig_dir, MC_LIB_EXT, NULL);
 826             if (!exist_file (extension_file))
 827             {
 828                 g_free (extension_file);
 829                 extension_file = mc_build_filename (mc_global.share_data_dir, MC_LIB_EXT, NULL);
 830             }
 831             mc_user_ext = FALSE;
 832         }
 833
 834         g_file_get_contents (extension_file, &data, NULL, NULL);
 835         g_free (extension_file);
 836         if (data == NULL)
 837             return 0;
 838
 839         if (strstr (data, "default/") == NULL)
 840         {
 841             if (strstr (data, "regex/") == NULL && strstr (data, "shell/") == NULL &&
 842                 strstr (data, "type/") == NULL)
 843             {
 844                 g_free (data);
 845                 data = NULL;
 846
 847                 if (!mc_user_ext)
 848                 {
 849                     char *title;
 850
 851                     title = g_strdup_printf (_(" %s%s file error"),
 852                                              mc_global.sysconfig_dir, MC_LIB_EXT);
 853                     message (D_ERROR, title, _("The format of the %smc.ext "
 854                                                "file has changed with version 3.0. It seems that "
 855                                                "the installation failed. Please fetch a fresh "
 856                                                "copy from the Midnight Commander package."),
 857                              mc_global.sysconfig_dir);
 858                     g_free (title);
 859                     return 0;
 860                 }
 861
 862                 home_error = TRUE;
 863                 goto check_stock_mc_ext;
 864             }
 865         }
 866
 867         if (home_error)
 868         {
 869             char *filebind_filename;
 870             char *title;
 871
 872             filebind_filename = mc_config_get_full_path (MC_FILEBIND_FILE);
 873             title = g_strdup_printf (_("%s file error"), filebind_filename);
 874             message (D_ERROR, title,
 875                      _("The format of the %s file has "
 876                        "changed with version 3.0. You may either want to copy "
 877                        "it from %smc.ext or use that file as an example of how to write it."),
 878                      filebind_filename, mc_global.sysconfig_dir);
 879             g_free (filebind_filename);
 880             g_free (title);
 881         }
 882     }
 883
 884     mc_stat (filename_vpath, &mystat);
 885
 886     include_target = NULL;
 887     include_target_len = 0;
 888     filename = vfs_path_to_str (filename_vpath);
 889     file_len = vfs_path_len (filename_vpath);
 890
 891     for (p = data; *p != '\0'; p++)
 892     {
 893         for (q = p; *q == ' ' || *q == '\t'; q++)
 894             ;
 895         if (*q == '\n' || *q == '\0')
 896             p = q;              /* empty line */
 897         if (*p == '#')          /* comment */
 898             while (*p != '\0' && *p != '\n')
 899                 p++;
 900         if (*p == '\n')
 901             continue;
 902         if (*p == '\0')
 903             break;
 904         if (p == q)
 905         {                       /* i.e. starts in the first column, should be
 906                                  * keyword/descNL
 907                                  */
 908             gboolean case_insense;
 909
 910             found = FALSE;
 911             q = strchr (p, '\n');
 912             if (q == NULL)
 913                 q = strchr (p, '\0');
 914             c = *q;
 915             *q = '\0';
 916             if (include_target)
 917             {
 918                 if ((strncmp (p, "include/", 8) == 0)
 919                     && (strncmp (p + 8, include_target, include_target_len) == 0))
 920                     found = TRUE;
 921             }
 922             else if (strncmp (p, "regex/", 6) == 0)
 923             {
 924                 mc_search_t *search;
 925
 926                 p += 6;
 927                 case_insense = (strncmp (p, "i/", 2) == 0);
 928                 if (case_insense)
 929                     p += 2;
 930
 931                 search = mc_search_new (p, -1);
 932                 if (search != NULL)
 933                 {
 934                     search->search_type = MC_SEARCH_T_REGEX;
 935                     search->is_case_sensitive = !case_insense;
 936                     found = mc_search_run (search, filename, 0, file_len, NULL);
 937                     mc_search_free (search);
 938                 }
 939             }
 940             else if (strncmp (p, "directory/", 10) == 0)
 941             {
 942                 if (S_ISDIR (mystat.st_mode) && mc_search (p + 10, filename, MC_SEARCH_T_REGEX))
 943                     found = TRUE;
 944             }
 945             else if (strncmp (p, "shell/", 6) == 0)
 946             {
 947                 int (*cmp_func) (const char *s1, const char *s2, size_t n) = strncmp;
 948
 949                 p += 6;
 950                 case_insense = (strncmp (p, "i/", 2) == 0);
 951                 if (case_insense)
 952                 {
 953                     p += 2;
 954                     cmp_func = strncasecmp;
 955                 }
 956
 957                 if (*p == '.' && file_len >= (size_t) (q - p))
 958                 {
 959                     if (cmp_func (p, filename + file_len - (q - p), q - p) == 0)
 960                         found = TRUE;
 961                 }
 962                 else
 963                 {
 964                     if ((size_t) (q - p) == file_len && cmp_func (p, filename, q - p) == 0)
 965                         found = TRUE;
 966                 }
 967             }
 968             else if (strncmp (p, "type/", 5) == 0)
 969             {
 970                 GError *error = NULL;
 971
 972                 p += 5;
 973
 974                 case_insense = (strncmp (p, "i/", 2) == 0);
 975                 if (case_insense)
 976                     p += 2;
 977
 978                 found = regex_check_type (filename_vpath, p, &have_type, case_insense, &error);
 979                 if (error != NULL)
 980                 {
 981                     g_error_free (error);
 982                     error_flag = TRUE;  /* leave it if file cannot be opened */
 983                 }
 984             }
 985             else if (strncmp (p, "default/", 8) == 0)
 986                 found = TRUE;
 987
 988             *q = c;
 989             p = q;
 990             if (*p == '\0')
 991                 break;
 992         }
 993         else
 994         {                       /* List of actions */
 995             p = q;
 996             q = strchr (p, '\n');
 997             if (q == NULL)
 998                 q = strchr (p, '\0');
 999             if (found && !error_flag)
1000             {
1001                 r = strchr (p, '=');
1002                 if (r != NULL)
1003                 {
1004                     c = *r;
1005                     *r = '\0';
1006                     if (strcmp (p, "Include") == 0)
1007                     {
1008                         char *t;
1009
1010                         include_target = p + 8;
1011                         t = strchr (include_target, '\n');
1012                         if (t != NULL)
1013                             *t = '\0';
1014                         include_target_len = strlen (include_target);
1015                         if (t != NULL)
1016                             *t = '\n';
1017
1018                         *r = c;
1019                         p = q;
1020                         found = FALSE;
1021
1022                         if (*p == '\0')
1023                             break;
1024                         continue;
1025                     }
1026
1027                     if (strcmp (action, p) != 0)
1028                         *r = c;
1029                     else
1030                     {
1031                         *r = c;
1032
1033                         for (p = r + 1; *p == ' ' || *p == '\t'; p++)
1034                             ;
1035
1036                         /* Empty commands just stop searching
1037                          * through, they don't do anything
1038                          */
1039                         if (p < q)
1040                         {
1041                             vfs_path_t *sv;
1042
1043                             sv = exec_extension (target, filename_vpath, r + 1, view_at_line_number);
1044                             if (script_vpath != NULL)
1045                                 *script_vpath = sv;
1046                             else
1047                                 exec_cleanup_script (sv);
1048
1049                             ret = 1;
1050                         }
1051                         break;
1052                     }
1053                 }
1054             }
1055             p = q;
1056             if (*p == '\0')
1057                 break;
1058         }
1059     }
1060     g_free (filename);
1061     if (error_flag)
1062         ret = -1;
1063     return ret;
1064 }
1065
1066 /* --------------------------------------------------------------------------------------------- */