src/command.c

   1 /* Command line widget.
   2    Copyright (C) 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3    2007 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18
  19    This widget is derived from the WInput widget, it's used to cope
  20    with all the magic of the command input line, we depend on some
  21    help from the program's callback.
  22
  23 */
  24
  25 /** \file command.c
  26  *  \brief Source: command line widget
  27  */
  28
  29 #include <config.h>
  30
  31 #include <stdlib.h>
  32 #include <errno.h>
  33 #include <string.h>
  34
  35 #include "lib/global.h"         /* home_dir */
  36 #include "lib/tty/tty.h"
  37 #include "lib/vfs/mc-vfs/vfs.h"
  38 #include "lib/strescape.h"
  39
  40 #include "widget.h"             /* WInput */
  41 #include "command.h"
  42 #include "wtools.h"             /* message () */
  43 #include "panel.h"              /* view_tree enum. Also, needed by main.h */
  44 #include "main.h"               /* do_cd */
  45 #include "layout.h"             /* for command_prompt variable */
  46 #include "user.h"               /* expand_format */
  47 #include "subshell.h"           /* SUBSHELL_EXIT */
  48 #include "tree.h"               /* for tree_chdir */
  49 #include "lib/skin.h"           /* DEFAULT_COLOR */
  50 #include "execute.h"            /* shell_execute */
  51
  52 /* This holds the command line */
  53 WInput *cmdline;
  54
  55 /*
  56  * Expand the argument to "cd" and change directory.  First try tilde
  57  * expansion, then variable substitution.  If the CDPATH variable is set
  58  * (e.g. CDPATH=".:~:/usr"), try all the paths contained there.
  59  * We do not support such rare substitutions as ${var:-value} etc.
  60  * No quoting is implemented here, so ${VAR} and $VAR will be always
  61  * substituted.  Wildcards are not supported either.
  62  * Advanced users should be encouraged to use "\cd" instead of "cd" if
  63  * they want the behavior they are used to in the shell.
  64  */
  65 static int
  66 examine_cd (const char *_path)
  67 {
  68     int result, qlen;
  69     char *path_tilde, *path;
  70     char *p, *q, *r, *s, c;
  71     const char *t;
  72
  73     /* Tilde expansion */
  74     path = strutils_shell_unescape(_path);
  75     path_tilde = tilde_expand (path);
  76
  77     /* Leave space for further expansion */
  78     qlen = strlen (path_tilde) + MC_MAXPATHLEN;
  79     q = g_malloc (qlen);
  80
  81     /* Variable expansion */
  82     for (p = path_tilde, r = q; *p && r < q + MC_MAXPATHLEN;) {
  83         if (*p != '$' || (p[1] == '[' || p[1] == '('))
  84             *(r++) = *(p++);
  85         else {
  86             p++;
  87             if (*p == '{') {
  88                 p++;
  89                 s = strchr (p, '}');
  90             } else
  91                 s = NULL;
  92             if (s == NULL)
  93                 s = strchr (p, PATH_SEP);
  94             if (s == NULL)
  95                 s = strchr (p, 0);
  96             c = *s;
  97             *s = 0;
  98             t = getenv (p);
  99             *s = c;
 100             if (t == NULL) {
 101                 *(r++) = '$';
 102                 if (*(p - 1) != '$')
 103                     *(r++) = '{';
 104             } else {
 105                 if (r + strlen (t) < q + MC_MAXPATHLEN) {
 106                     strcpy (r, t);
 107                     r = strchr (r, 0);
 108                 }
 109                 if (*s == '}')
 110                     p = s + 1;
 111                 else
 112                     p = s;
 113             }
 114         }
 115     }
 116     *r = 0;
 117
 118     result = do_cd (q, cd_parse_command);
 119
 120     /* CDPATH handling */
 121     if (*q != PATH_SEP && !result) {
 122         char * const cdpath = g_strdup (getenv ("CDPATH"));
 123         p = cdpath;
 124         if (p == NULL)
 125             c = 0;
 126         else
 127             c = ':';
 128         while (!result && c == ':') {
 129             s = strchr (p, ':');
 130             if (s == NULL)
 131                 s = strchr (p, 0);
 132             c = *s;
 133             *s = 0;
 134             if (*p) {
 135                 r = concat_dir_and_file (p, q);
 136                 result = do_cd (r, cd_parse_command);
 137                 g_free (r);
 138             }
 139             *s = c;
 140             p = s + 1;
 141         }
 142         g_free (cdpath);
 143     }
 144     g_free (q);
 145     g_free (path_tilde);
 146     g_free (path);
 147     return result;
 148 }
 149
 150 /* Execute the cd command on the command line */
 151 void do_cd_command (char * orig_cmd)
 152 {
 153     int len;
 154     const char * cmd;
 155
 156     /* Any final whitespace should be removed here
 157        (to see why, try "cd fred "). */
 158     /* NOTE: I think we should not remove the extra space,
 159        that way, we can cd into hidden directories */
 160     /* FIXME: what about interpreting quoted strings like the shell.
 161        so one could type "cd <tab> M-a <enter>" and it would work. */
 162     len = strlen (orig_cmd) - 1;
 163     while (len >= 0 &&
 164            (orig_cmd [len] == ' ' || orig_cmd [len] == '\t' || orig_cmd [len] == '\n')){
 165         orig_cmd [len] = 0;
 166         len --;
 167     }
 168
 169     cmd = orig_cmd;
 170     if (cmd [2] == 0)
 171         cmd = "cd ";
 172
 173     if (get_current_type () == view_tree){
 174         if (cmd [0] == 0){
 175             sync_tree (home_dir);
 176         } else if (strcmp (cmd+3, "..") == 0){
 177             char *dir = current_panel->cwd;
 178             len = strlen (dir);
 179             while (len && dir [--len] != PATH_SEP);
 180             dir [len] = 0;
 181             if (len)
 182                 sync_tree (dir);
 183             else
 184                 sync_tree (PATH_SEP_STR);
 185         } else if (cmd [3] == PATH_SEP){
 186             sync_tree (cmd+3);
 187         } else {
 188             char *old = current_panel->cwd;
 189             char *new;
 190             new = concat_dir_and_file (old, cmd+3);
 191             sync_tree (new);
 192             g_free (new);
 193         }
 194     } else
 195         if (!examine_cd (&cmd [3])) {
 196             char *d = strip_password (g_strdup (&cmd [3]), 1);
 197             message (D_ERROR, MSG_ERROR, _("Cannot chdir to \"%s\"\n%s"),
 198                      d, unix_error_string (errno));
 199             g_free (d);
 200             return;
 201         }
 202 }
 203
 204 /* Handle Enter on the command line */
 205 static cb_ret_t
 206 enter (WInput *lc_cmdline)
 207 {
 208     char *cmd = lc_cmdline->buffer;
 209
 210     if (!command_prompt)
 211         return MSG_HANDLED;
 212
 213     /* Any initial whitespace should be removed at this point */
 214     while (*cmd == ' ' || *cmd == '\t' || *cmd == '\n')
 215         cmd++;
 216
 217     if (!*cmd)
 218         return MSG_HANDLED;
 219
 220     if (strncmp (cmd, "cd ", 3) == 0 || strcmp (cmd, "cd") == 0) {
 221         do_cd_command (cmd);
 222         new_input (lc_cmdline);
 223         return MSG_HANDLED;
 224     } else if (strcmp (cmd, "exit") == 0) {
 225         assign_text (lc_cmdline, "");
 226         if (!quiet_quit_cmd ())
 227             return MSG_NOT_HANDLED;
 228     } else {
 229         char *command, *s;
 230         size_t i, j, cmd_len;
 231
 232         if (!vfs_current_is_local ()) {
 233             message (D_ERROR, MSG_ERROR,
 234                      _("Cannot execute commands on non-local filesystems"));
 235             return MSG_NOT_HANDLED;
 236         }
 237 #ifdef HAVE_SUBSHELL_SUPPORT
 238         /* Check this early before we clean command line
 239          * (will be checked again by shell_execute) */
 240         if (use_subshell && subshell_state != INACTIVE) {
 241             message (D_ERROR, MSG_ERROR,
 242                      _("The shell is already running a command"));
 243             return MSG_NOT_HANDLED;
 244         }
 245 #endif
 246         cmd_len = strlen (cmd);
 247         command = g_malloc (cmd_len + 1);
 248         command[0] = 0;
 249         for (i = j = 0; i < cmd_len; i++) {
 250             if (cmd[i] == '%') {
 251                 i++;
 252                 s = expand_format (NULL, cmd[i], TRUE);
 253                 command = g_realloc (command, j + strlen (s) + cmd_len - i + 1);
 254                 strcpy (command + j, s);
 255                 g_free (s);
 256                 j = strlen (command);
 257             } else {
 258                 command[j] = cmd[i];
 259                 j++;
 260             }
 261             command[j] = 0;
 262         }
 263         new_input (lc_cmdline);
 264         shell_execute (command, 0);
 265         g_free (command);
 266
 267 #ifdef HAVE_SUBSHELL_SUPPORT
 268         if ((quit & SUBSHELL_EXIT) != 0) {
 269             if (quiet_quit_cmd ())
 270                 return MSG_HANDLED;
 271
 272             quit = 0;
 273             /* restart subshell */
 274             if (use_subshell)
 275                 init_subshell ();
 276         }
 277
 278         if (use_subshell)
 279             load_prompt (0, 0);
 280 #endif
 281     }
 282     return MSG_HANDLED;
 283 }
 284
 285 static cb_ret_t
 286 command_callback (Widget *w, widget_msg_t msg, int parm)
 287 {
 288     WInput *cmd = (WInput *) w;
 289
 290     switch (msg) {
 291     case WIDGET_FOCUS:
 292         /* Never accept focus, otherwise panels will be unselected */
 293         return MSG_NOT_HANDLED;
 294
 295     case WIDGET_KEY:
 296         /* Special case: we handle the enter key */
 297         if (parm == '\n') {
 298             return enter (cmd);
 299         }
 300         /* fall through */
 301
 302     default:
 303         return input_callback (w, msg, parm);
 304     }
 305 }
 306
 307 WInput *
 308 command_new (int y, int x, int cols)
 309 {
 310     WInput *cmd;
 311     const int command_colors[3] =
 312     {
 313         DEFAULT_COLOR,
 314         DEFAULT_COLOR,
 315         COMMAND_MARK_COLOR
 316     };
 317
 318     cmd = input_new (y, x, (int *) command_colors, cols, "", "cmdline",
 319         INPUT_COMPLETE_DEFAULT | INPUT_COMPLETE_CD | INPUT_COMPLETE_COMMANDS | INPUT_COMPLETE_SHELL_ESC);
 320
 321     /* Add our hooks */
 322     cmd->widget.callback = command_callback;
 323
 324     return cmd;
 325 }
 326
 327 /*
 328  * Insert quoted text in input line.  The function is meant for the
 329  * command line, so the percent sign is quoted as well.
 330  */
 331 void
 332 command_insert (WInput * in, const char *text, int insert_extra_space)
 333 {
 334     char *quoted_text;
 335
 336     quoted_text = name_quote (text, 1);
 337     stuff (in, quoted_text, insert_extra_space);
 338     g_free (quoted_text);
 339 }
 340