src/filemanager/command.c

   1 /*
   2    Command line widget.
   3    This widget is derived from the WInput widget, it's used to cope
   4    with all the magic of the command input line, we depend on some
   5    help from the program's callback.
   6
   7    Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   8    2007, 2011
   9    The Free Software Foundation, Inc.
  10
  11    This file is part of the Midnight Commander.
  12
  13    The Midnight Commander is free software: you can redistribute it
  14    and/or modify it under the terms of the GNU General Public License as
  15    published by the Free Software Foundation, either version 3 of the License,
  16    or (at your option) any later version.
  17
  18    The Midnight Commander is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27 /** \file command.c
  28  *  \brief Source: command line widget
  29  */
  30
  31 #include <config.h>
  32
  33 #include <stdlib.h>
  34 #include <errno.h>
  35 #include <string.h>
  36
  37 #include "lib/global.h"         /* home_dir */
  38 #include "lib/tty/tty.h"
  39 #include "lib/vfs/vfs.h"
  40 #include "lib/strescape.h"
  41 #include "lib/skin.h"           /* DEFAULT_COLOR */
  42 #include "lib/util.h"
  43 #include "lib/widget.h"
  44
  45 #include "src/setup.h"          /* quit */
  46 #ifdef ENABLE_SUBSHELL
  47 #include "src/subshell.h"
  48 #endif
  49 #include "src/execute.h"        /* shell_execute */
  50
  51 #include "midnight.h"           /* current_panel */
  52 #include "layout.h"             /* for command_prompt variable */
  53 #include "usermenu.h"           /* expand_format */
  54 #include "tree.h"               /* for tree_chdir */
  55
  56 #include "command.h"
  57
  58 /*** global variables ****************************************************************************/
  59
  60 /* This holds the command line */
  61 WInput *cmdline;
  62
  63 /*** file scope macro definitions ****************************************************************/
  64
  65 #define CD_OPERAND_OFFSET 3
  66
  67 /*** file scope type declarations ****************************************************************/
  68
  69 /*** file scope variables ************************************************************************/
  70
  71 /*** file scope functions ************************************************************************/
  72 /* --------------------------------------------------------------------------------------------- */
  73
  74 /**
  75  * Expand the argument to "cd" and change directory.  First try tilde
  76  * expansion, then variable substitution.  If the CDPATH variable is set
  77  * (e.g. CDPATH=".:~:/usr"), try all the paths contained there.
  78  * We do not support such rare substitutions as ${var:-value} etc.
  79  * No quoting is implemented here, so ${VAR} and $VAR will be always
  80  * substituted.  Wildcards are not supported either.
  81  * Advanced users should be encouraged to use "\cd" instead of "cd" if
  82  * they want the behavior they are used to in the shell.
  83  *
  84  * @param _path string to examine
  85  * @return newly allocated string
  86  */
  87
  88 static char *
  89 examine_cd (const char *_path)
  90 {
  91     typedef enum
  92     { copy_sym, subst_var } state_t;
  93
  94     state_t state = copy_sym;
  95     char *q;
  96     size_t qlen;
  97     char *path_tilde, *path;
  98     char *p, *r;
  99
 100     /* Tilde expansion */
 101     path = strutils_shell_unescape (_path);
 102     path_tilde = tilde_expand (path);
 103     g_free (path);
 104
 105     /* Leave space for further expansion */
 106     qlen = strlen (path_tilde) + MC_MAXPATHLEN;
 107     q = g_malloc (qlen);
 108
 109     /* Variable expansion */
 110     for (p = path_tilde, r = q; *p != '\0' && r < q + MC_MAXPATHLEN;)
 111     {
 112
 113         switch (state)
 114         {
 115         case copy_sym:
 116             if (p[0] == '\\' && p[1] == '$')
 117             {
 118                 /* skip backslash */
 119                 p++;
 120                 /* copy dollar */
 121                 *(r++) = *(p++);
 122             }
 123             else if (p[0] != '$' || p[1] == '[' || p[1] == '(')
 124                 *(r++) = *(p++);
 125             else
 126                 state = subst_var;
 127             break;
 128
 129         case subst_var:
 130             {
 131                 char *s;
 132                 char c;
 133                 const char *t;
 134
 135                 /* skip dollar */
 136                 p++;
 137
 138                 if (p[0] != '{')
 139                     s = NULL;
 140                 else
 141                 {
 142                     p++;
 143                     s = strchr (p, '}');
 144                 }
 145                 if (s == NULL)
 146                     s = strchr (p, PATH_SEP);
 147                 if (s == NULL)
 148                     s = strchr (p, '\0');
 149                 c = *s;
 150                 *s = '\0';
 151                 t = getenv (p);
 152                 *s = c;
 153                 if (t == NULL)
 154                 {
 155                     *(r++) = '$';
 156                     if (p[-1] != '$')
 157                         *(r++) = '{';
 158                 }
 159                 else
 160                 {
 161                     size_t tlen;
 162
 163                     tlen = strlen (t);
 164
 165                     if (r + tlen < q + MC_MAXPATHLEN)
 166                     {
 167                         strncpy (r, t, tlen + 1);
 168                         r += tlen;
 169                     }
 170                     p = s;
 171                     if (*s == '}')
 172                         p++;
 173                 }
 174
 175                 state = copy_sym;
 176                 break;
 177             }
 178         }
 179     }
 180
 181     g_free (path_tilde);
 182
 183     *r = '\0';
 184
 185     return q;
 186 }
 187
 188 /* --------------------------------------------------------------------------------------------- */
 189
 190 /* CDPATH handling */
 191 static gboolean
 192 handle_cdpath (const char *path)
 193 {
 194     gboolean result = FALSE;
 195
 196     /* CDPATH handling */
 197     if (*path != PATH_SEP)
 198     {
 199         char *cdpath, *p;
 200         char c;
 201
 202         cdpath = g_strdup (getenv ("CDPATH"));
 203         p = cdpath;
 204         c = (p == NULL) ? '\0' : ':';
 205
 206         while (!result && c == ':')
 207         {
 208             char *s;
 209
 210             s = strchr (p, ':');
 211             if (s == NULL)
 212                 s = strchr (p, '\0');
 213             c = *s;
 214             *s = '\0';
 215             if (*p != '\0')
 216             {
 217                 vfs_path_t *r_vpath;
 218
 219                 r_vpath = vfs_path_build_filename (p, path, NULL);
 220                 result = do_cd (r_vpath, cd_parse_command);
 221                 vfs_path_free (r_vpath);
 222             }
 223             *s = c;
 224             p = s + 1;
 225         }
 226         g_free (cdpath);
 227     }
 228
 229     return result;
 230 }
 231
 232 /* --------------------------------------------------------------------------------------------- */
 233
 234 /** Handle Enter on the command line
 235  *
 236  * @param lc_cmdline string for handling
 237  * @return MSG_HANDLED on sucsess else MSG_NOT_HANDLED
 238  */
 239
 240 static cb_ret_t
 241 enter (WInput * lc_cmdline)
 242 {
 243     char *cmd = lc_cmdline->buffer;
 244
 245     if (!command_prompt)
 246         return MSG_HANDLED;
 247
 248     /* Any initial whitespace should be removed at this point */
 249     while (*cmd == ' ' || *cmd == '\t' || *cmd == '\n')
 250         cmd++;
 251
 252     if (!*cmd)
 253         return MSG_HANDLED;
 254
 255     if (strncmp (cmd, "cd ", 3) == 0 || strcmp (cmd, "cd") == 0)
 256     {
 257         do_cd_command (cmd);
 258         input_clean (lc_cmdline);
 259         return MSG_HANDLED;
 260     }
 261     else if (strcmp (cmd, "exit") == 0)
 262     {
 263         input_assign_text (lc_cmdline, "");
 264         if (!quiet_quit_cmd ())
 265             return MSG_NOT_HANDLED;
 266     }
 267     else
 268     {
 269         GString *command;
 270         size_t i;
 271
 272         if (!vfs_current_is_local ())
 273         {
 274             message (D_ERROR, MSG_ERROR, _("Cannot execute commands on non-local filesystems"));
 275             return MSG_NOT_HANDLED;
 276         }
 277 #ifdef ENABLE_SUBSHELL
 278         /* Check this early before we clean command line
 279          * (will be checked again by shell_execute) */
 280         if (mc_global.tty.use_subshell && subshell_state != INACTIVE)
 281         {
 282             message (D_ERROR, MSG_ERROR, _("The shell is already running a command"));
 283             return MSG_NOT_HANDLED;
 284         }
 285 #endif
 286         command = g_string_sized_new (32);
 287
 288         for (i = 0; cmd[i] != '\0'; i++)
 289         {
 290             if (cmd[i] != '%')
 291                 g_string_append_c (command, cmd[i]);
 292             else
 293             {
 294                 char *s;
 295
 296                 s = expand_format (NULL, cmd[++i], TRUE);
 297                 g_string_append (command, s);
 298                 g_free (s);
 299             }
 300         }
 301
 302         input_clean (lc_cmdline);
 303         shell_execute (command->str, 0);
 304         g_string_free (command, TRUE);
 305
 306 #ifdef ENABLE_SUBSHELL
 307         if ((quit & SUBSHELL_EXIT) != 0)
 308         {
 309             if (quiet_quit_cmd ())
 310                 return MSG_HANDLED;
 311
 312             quit = 0;
 313             /* restart subshell */
 314             if (mc_global.tty.use_subshell)
 315                 init_subshell ();
 316         }
 317
 318         if (mc_global.tty.use_subshell)
 319             do_load_prompt ();
 320 #endif
 321     }
 322     return MSG_HANDLED;
 323 }
 324
 325 /* --------------------------------------------------------------------------------------------- */
 326
 327 /**
 328  * Default command line callback
 329  *
 330  * @param w Widget object
 331  * @param msg message for handling
 332  * @param parm extra parameter such as key code
 333  *
 334  * @return MSG_NOT_HANDLED on fail else MSG_HANDLED
 335  */
 336
 337 static cb_ret_t
 338 command_callback (Widget * w, widget_msg_t msg, int parm)
 339 {
 340     WInput *cmd = (WInput *) w;
 341
 342     switch (msg)
 343     {
 344     case WIDGET_FOCUS:
 345         /* Never accept focus, otherwise panels will be unselected */
 346         return MSG_NOT_HANDLED;
 347
 348     case WIDGET_KEY:
 349         /* Special case: we handle the enter key */
 350         if (parm == '\n')
 351             return enter (cmd);
 352         /* fall through */
 353
 354     default:
 355         return input_callback (w, msg, parm);
 356     }
 357 }
 358
 359 /* --------------------------------------------------------------------------------------------- */
 360 /*** public functions ****************************************************************************/
 361 /* --------------------------------------------------------------------------------------------- */
 362
 363 /** Execute the cd command on the command line
 364  *
 365  * @param orig_cmd command for execution
 366  */
 367
 368 void
 369 do_cd_command (char *orig_cmd)
 370 {
 371     int len;
 372     int operand_pos = CD_OPERAND_OFFSET;
 373     const char *cmd;
 374
 375     /* Any final whitespace should be removed here
 376        (to see why, try "cd fred "). */
 377     /* NOTE: I think we should not remove the extra space,
 378        that way, we can cd into hidden directories */
 379     /* FIXME: what about interpreting quoted strings like the shell.
 380        so one could type "cd <tab> M-a <enter>" and it would work. */
 381     len = strlen (orig_cmd) - 1;
 382     while (len >= 0 && (orig_cmd[len] == ' ' || orig_cmd[len] == '\t' || orig_cmd[len] == '\n'))
 383     {
 384         orig_cmd[len] = 0;
 385         len--;
 386     }
 387
 388     cmd = orig_cmd;
 389     if (cmd[CD_OPERAND_OFFSET - 1] == 0)
 390         cmd = "cd ";            /* 0..2 => given text, 3 => \0 */
 391
 392     /* allow any amount of white space in front of the path operand */
 393     while (cmd[operand_pos] == ' ' || cmd[operand_pos] == '\t')
 394         operand_pos++;
 395
 396     if (get_current_type () == view_tree)
 397     {
 398         if (cmd[0] == 0)
 399         {
 400             sync_tree (mc_config_get_home_dir ());
 401         }
 402         else if (strcmp (cmd + operand_pos, "..") == 0)
 403         {
 404             char *str_path;
 405
 406             if (vfs_path_elements_count (current_panel->cwd_vpath) != 1 ||
 407                 strlen (vfs_path_get_by_index (current_panel->cwd_vpath, 0)->path) > 1)
 408             {
 409                 vfs_path_t *tmp_vpath = current_panel->cwd_vpath;
 410
 411                 current_panel->cwd_vpath =
 412                     vfs_path_vtokens_get (tmp_vpath, 0, vfs_path_tokens_count (tmp_vpath) - 1);
 413                 vfs_path_free (tmp_vpath);
 414             }
 415             str_path = vfs_path_to_str (current_panel->cwd_vpath);
 416             sync_tree (str_path);
 417             g_free (str_path);
 418         }
 419         else if (cmd[operand_pos] == PATH_SEP)
 420         {
 421             sync_tree (cmd + operand_pos);
 422         }
 423         else
 424         {
 425             char *str_path;
 426             vfs_path_t *new_vpath;
 427
 428             new_vpath = vfs_path_append_new (current_panel->cwd_vpath, cmd + operand_pos, NULL);
 429             str_path = vfs_path_to_str (new_vpath);
 430             vfs_path_free (new_vpath);
 431             sync_tree (str_path);
 432             g_free (str_path);
 433         }
 434     }
 435     else
 436     {
 437         char *path;
 438         vfs_path_t *q_vpath;
 439         gboolean ok;
 440
 441         path = examine_cd (&cmd[operand_pos]);
 442
 443         if (*path == '\0')
 444             q_vpath = vfs_path_from_str (mc_config_get_home_dir ());
 445         else
 446             q_vpath = vfs_path_from_str_flags (path, VPF_NO_CANON);
 447
 448         ok = do_cd (q_vpath, cd_parse_command);
 449         if (!ok)
 450             ok = handle_cdpath (path);
 451
 452         if (!ok)
 453         {
 454             char *d;
 455
 456             d = vfs_path_to_str_flags (q_vpath, 0, VPF_STRIP_PASSWORD);
 457             message (D_ERROR, MSG_ERROR, _("Cannot chdir to \"%s\"\n%s"), d,
 458                      unix_error_string (errno));
 459             g_free (d);
 460         }
 461
 462         vfs_path_free (q_vpath);
 463         g_free (path);
 464     }
 465 }
 466
 467 /* --------------------------------------------------------------------------------------------- */
 468
 469 WInput *
 470 command_new (int y, int x, int cols)
 471 {
 472     WInput *cmd;
 473     const input_colors_t command_colors = {
 474         DEFAULT_COLOR,
 475         COMMAND_MARK_COLOR,
 476         DEFAULT_COLOR,
 477         COMMAND_HISTORY_COLOR
 478     };
 479
 480     cmd = input_new (y, x, (int *) command_colors, cols, "", "cmdline",
 481                      INPUT_COMPLETE_DEFAULT | INPUT_COMPLETE_CD | INPUT_COMPLETE_COMMANDS |
 482                      INPUT_COMPLETE_SHELL_ESC);
 483
 484     /* Add our hooks */
 485     cmd->widget.callback = command_callback;
 486
 487     return cmd;
 488 }
 489
 490 /* --------------------------------------------------------------------------------------------- */
 491 /**
 492  * Insert quoted text in input line.  The function is meant for the
 493  * command line, so the percent sign is quoted as well.
 494  *
 495  * @param in WInput object
 496  * @param text string for insertion
 497  * @param insert_extra_space add extra space
 498  */
 499
 500 void
 501 command_insert (WInput * in, const char *text, gboolean insert_extra_space)
 502 {
 503     char *quoted_text;
 504
 505     quoted_text = name_quote (text, 1);
 506     input_insert (in, quoted_text, insert_extra_space);
 507     g_free (quoted_text);
 508 }
 509
 510 /* --------------------------------------------------------------------------------------------- */