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/*
cd_to() function.
Copyright (C) 1995-2024
Free Software Foundation, Inc.
Written by:
Slava Zanko <slavazanko@gmail.com>, 2013
Andrew Borodin <aborodin@vmail.ru>, 2020
This file is part of the Midnight Commander.
The Midnight Commander is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
The Midnight Commander is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** \file cd.c
* \brief Source: cd_to() function
*/
#include <config.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include "lib/global.h"
#include "lib/vfs/vfs.h"
#include "lib/strescape.h" /* strutils_shell_unescape() */
#include "lib/util.h" /* whitespace() */
#include "lib/widget.h" /* message() */
#include "filemanager.h" /* current_panel, panel.h, layout.h */
#include "tree.h" /* sync_tree() */
#include "cd.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/**
* Expand the argument to "cd" and change directory. First try tilde
* expansion, then variable substitution. If the CDPATH variable is set
* (e.g. CDPATH=".:~:/usr"), try all the paths contained there.
* We do not support such rare substitutions as ${var:-value} etc.
* No quoting is implemented here, so ${VAR} and $VAR will be always
* substituted. Wildcards are not supported either.
* Advanced users should be encouraged to use "\cd" instead of "cd" if
* they want the behavior they are used to in the shell.
*
* @param _path string to examine
* @return newly allocated string
*/
static GString *
examine_cd (const char *_path)
{
/* *INDENT-OFF* */
typedef enum
{
copy_sym,
subst_var
} state_t;
/* *INDENT-ON* */
state_t state = copy_sym;
GString *q;
char *path_tilde, *path;
char *p;
/* Tilde expansion */
path = strutils_shell_unescape (_path);
path_tilde = tilde_expand (path);
g_free (path);
q = g_string_sized_new (32);
/* Variable expansion */
for (p = path_tilde; *p != '\0';)
{
switch (state)
{
case copy_sym:
if (p[0] == '\\' && p[1] == '$')
{
g_string_append_c (q, '$');
p += 2;
}
else if (p[0] != '$' || p[1] == '[' || p[1] == '(')
{
g_string_append_c (q, *p);
p++;
}
else
state = subst_var;
break;
case subst_var:
{
char *s = NULL;
char c;
const char *t = NULL;
/* skip dollar */
p++;
if (p[0] == '{')
{
p++;
s = strchr (p, '}');
}
if (s == NULL)
s = strchr (p, PATH_SEP);
if (s == NULL)
s = strchr (p, '\0');
c = *s;
*s = '\0';
t = getenv (p);
*s = c;
if (t == NULL)
{
g_string_append_c (q, '$');
if (p[-1] != '$')
g_string_append_c (q, '{');
}
else
{
g_string_append (q, t);
p = s;
if (*s == '}')
p++;
}
state = copy_sym;
break;
}
default:
break;
}
}
g_free (path_tilde);
return q;
}
/* --------------------------------------------------------------------------------------------- */
/* CDPATH handling */
static gboolean
handle_cdpath (const char *path)
{
gboolean result = FALSE;
/* CDPATH handling */
if (!IS_PATH_SEP (*path))
{
char *cdpath, *p;
char c;
cdpath = g_strdup (getenv ("CDPATH"));
p = cdpath;
c = (p == NULL) ? '\0' : ':';
while (!result && c == ':')
{
char *s;
s = strchr (p, ':');
if (s == NULL)
s = strchr (p, '\0');
c = *s;
*s = '\0';
if (*p != '\0')
{
vfs_path_t *r_vpath;
r_vpath = vfs_path_build_filename (p, path, (char *) NULL);
result = panel_cd (current_panel, r_vpath, cd_parse_command);
vfs_path_free (r_vpath, TRUE);
}
*s = c;
p = s + 1;
}
g_free (cdpath);
}
return result;
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/** Execute the cd command to specified path
*
* @param path path to cd
*/
void
cd_to (const char *path)
{
char *p;
/* Remove leading whitespaces. */
/* Any final whitespace should be removed here (to see why, try "cd fred "). */
/* NOTE: I think we should not remove the extra space,
that way, we can cd into hidden directories */
/* FIXME: what about interpreting quoted strings like the shell.
so one could type "cd <tab> M-a <enter>" and it would work. */
p = g_strstrip (g_strdup (path));
if (get_current_type () == view_tree)
{
vfs_path_t *new_vpath = NULL;
if (p[0] == '\0')
{
new_vpath = vfs_path_from_str (mc_config_get_home_dir ());
sync_tree (new_vpath);
}
else if (DIR_IS_DOTDOT (p))
{
if (vfs_path_elements_count (current_panel->cwd_vpath) != 1 ||
strlen (vfs_path_get_by_index (current_panel->cwd_vpath, 0)->path) > 1)
{
vfs_path_t *tmp_vpath = current_panel->cwd_vpath;
current_panel->cwd_vpath =
vfs_path_vtokens_get (tmp_vpath, 0, vfs_path_tokens_count (tmp_vpath) - 1);
vfs_path_free (tmp_vpath, TRUE);
}
sync_tree (current_panel->cwd_vpath);
}
else
{
if (IS_PATH_SEP (*p))
new_vpath = vfs_path_from_str (p);
else
new_vpath = vfs_path_append_new (current_panel->cwd_vpath, p, (char *) NULL);
sync_tree (new_vpath);
}
vfs_path_free (new_vpath, TRUE);
}
else
{
GString *s_path;
vfs_path_t *q_vpath;
gboolean ok;
s_path = examine_cd (p);
if (s_path->len == 0)
q_vpath = vfs_path_from_str (mc_config_get_home_dir ());
else
q_vpath = vfs_path_from_str_flags (s_path->str, VPF_NO_CANON);
ok = panel_cd (current_panel, q_vpath, cd_parse_command);
if (!ok)
ok = handle_cdpath (s_path->str);
if (!ok)
{
char *d;
d = vfs_path_to_str_flags (q_vpath, 0, VPF_STRIP_PASSWORD);
cd_error_message (d);
g_free (d);
}
vfs_path_free (q_vpath, TRUE);
g_string_free (s_path, TRUE);
}
g_free (p);
}
/* --------------------------------------------------------------------------------------------- */
void
cd_error_message (const char *path)
{
message (D_ERROR, MSG_ERROR, _("Cannot change directory to\n%s\n%s"), path,
unix_error_string (errno));
}
/* --------------------------------------------------------------------------------------------- */
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