mc/src/main.c

/* Main program for the Midnight Commander
   Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
   2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.

   Written by: 1994, 1995, 1996, 1997 Miguel de Icaza
   1994, 1995 Janne Kukonlehto
   1997 Norbert Warmuth

   This program 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 2 of the License, or
   (at your option) any later version.

   This program 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, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

/** \file main.c
 *  \brief Source: this is a main module
 */

#include <config.h>

#include <ctype.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <pwd.h>                /* for username in xterm title */

#include "lib/global.h"

#include "lib/tty/tty.h"
#include "lib/tty/key.h"        /* For init_key() */
#include "lib/tty/win.h"        /* xterm_flag */
#include "lib/skin.h"
#include "lib/filehighlight.h"
#include "lib/fileloc.h"
#include "lib/strutil.h"
#include "lib/util.h"
#include "lib/vfs/mc-vfs/vfs.h" /* vfs_init(), vfs_shut() */

#include "args.h"
#include "midnight.h"           /* current_panel */
#include "treestore.h"          /* tree_store_save */
#include "subshell.h"
#include "setup.h"              /* save_setup() */
#include "layout.h"             /* command_prompt */
#include "ext.h"                /* flush_extension_file() */
#include "command.h"            /* cmdline */

#ifdef HAVE_CHARSET
#include "lib/charsets.h"
#include "selcodepage.h"
#endif /* HAVE_CHARSET */

#include "consaver/cons.saver.h"        /* console_flag */

#include "main.h"

/*** global variables ****************************************************************************/

mc_fhl_t *mc_filehighlight;

/* Set when main loop should be terminated */
int quit = 0;

#ifdef HAVE_CHARSET
/* Numbers of (file I/O) and (input/display) codepages. -1 if not selected */
int source_codepage = -1;
int default_source_codepage = -1;
int display_codepage = -1;
char *autodetect_codeset = NULL;
gboolean is_autodetect_codeset_enabled = FALSE;
#else
/* If true, allow characters in the range 160-255 */
int eight_bit_clean = 1;
/*
 * If true, also allow characters in the range 128-159.
 * This is reported to break on many terminals (xterm, qansi-m).
 */
int full_eight_bits = 0;
#endif /* !HAVE_CHARSET */

/*
 * If utf-8 terminal utf8_display = 1
 * Display bits set UTF-8
 */
int utf8_display = 0;

/* If true use the internal viewer */
int use_internal_view = 1;
/* If set, use the builtin editor */
int use_internal_edit = 1;

mc_run_mode_t mc_run_mode = MC_RUN_FULL;
char *mc_run_param0 = NULL;
char *mc_run_param1 = NULL;

/* Used so that widgets know if they are being destroyed or
   shut down */
int midnight_shutdown = 0;

/* The user's shell */
char *shell = NULL;

/* The prompt */
const char *mc_prompt = NULL;

/* mc_home: The home of MC - /etc/mc or defined by MC_DATADIR */
char *mc_home = NULL;
/* mc_home_alt: Alternative home of MC - deprecated /usr/share/mc */
char *mc_home_alt = NULL;
/* The home directory */
const char *home_dir = NULL;

/* Set to TRUE to suppress printing the last directory */
int print_last_revert = FALSE;

/* If set, then print to the given file the last directory we were at */
char *last_wd_string = NULL;

/*** file scope macro definitions ****************************************************************/

/*** file scope type declarations ****************************************************************/

/*** file scope variables ************************************************************************/

/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */

static void
check_codeset (void)
{
    const char *current_system_codepage = NULL;

    current_system_codepage = str_detect_termencoding ();

#ifdef HAVE_CHARSET
    {
        const char *_display_codepage;

        _display_codepage = get_codepage_id (display_codepage);

        if (strcmp (_display_codepage, current_system_codepage) != 0)
        {
            display_codepage = get_codepage_index (current_system_codepage);
            if (display_codepage == -1)
                display_codepage = 0;

            mc_config_set_string (mc_main_config, "Misc", "display_codepage", cp_display);
        }
    }
#endif

    utf8_display = str_isutf8 (current_system_codepage);
}

/* --------------------------------------------------------------------------------------------- */

/** POSIX version.  The only version we support.  */
static void
OS_Setup (void)
{
    const char *shell_env = getenv ("SHELL");
    const char *mc_libdir;

    if ((shell_env == NULL) || (shell_env[0] == '\0'))
    {
        struct passwd *pwd;
        pwd = getpwuid (geteuid ());
        if (pwd != NULL)
            shell = g_strdup (pwd->pw_shell);
    }
    else
        shell = g_strdup (shell_env);

    if ((shell == NULL) || (shell[0] == '\0'))
    {
        g_free (shell);
        shell = g_strdup ("/bin/sh");
    }

    /* This is the directory, where MC was installed, on Unix this is DATADIR */
    /* and can be overriden by the MC_DATADIR environment variable */
    mc_libdir = getenv ("MC_DATADIR");
    if (mc_libdir != NULL)
    {
        mc_home = g_strdup (mc_libdir);
        mc_home_alt = g_strdup (SYSCONFDIR);
    }
    else
    {
        mc_home = g_strdup (SYSCONFDIR);
        mc_home_alt = g_strdup (DATADIR);
    }

    /* This variable is used by the subshell */
    home_dir = getenv ("HOME");

    if (home_dir == NULL)
        home_dir = mc_home;
}

/* --------------------------------------------------------------------------------------------- */

static void
sigchld_handler_no_subshell (int sig)
{
#ifdef __linux__
    int pid, status;

    if (!console_flag)
        return;

    /* COMMENT: if it were true that after the call to handle_console(..INIT)
       the value of console_flag never changed, we could simply not install
       this handler at all if (!console_flag && !use_subshell). */

    /* That comment is no longer true.  We need to wait() on a sigchld
       handler (that's at least what the tarfs code expects currently). */

    pid = waitpid (cons_saver_pid, &status, WUNTRACED | WNOHANG);

    if (pid == cons_saver_pid)
    {

        if (WIFSTOPPED (status))
        {
            /* Someone has stopped cons.saver - restart it */
            kill (pid, SIGCONT);
        }
        else
        {
            /* cons.saver has died - disable console saving */
            handle_console (CONSOLE_DONE);
            console_flag = 0;
        }
    }
    /* If we got here, some other child exited; ignore it */
#endif /* __linux__ */

    (void) sig;
}

/* --------------------------------------------------------------------------------------------- */

static void
init_sigchld (void)
{
    struct sigaction sigchld_action;

    sigchld_action.sa_handler =
#ifdef HAVE_SUBSHELL_SUPPORT
        use_subshell ? sigchld_handler :
#endif /* HAVE_SUBSHELL_SUPPORT */
        sigchld_handler_no_subshell;

    sigemptyset (&sigchld_action.sa_mask);

#ifdef SA_RESTART
    sigchld_action.sa_flags = SA_RESTART;
#else
    sigchld_action.sa_flags = 0;
#endif /* !SA_RESTART */

    if (sigaction (SIGCHLD, &sigchld_action, NULL) == -1)
    {
#ifdef HAVE_SUBSHELL_SUPPORT
        /*
         * This may happen on QNX Neutrino 6, where SA_RESTART
         * is defined but not implemented.  Fallback to no subshell.
         */
        use_subshell = 0;
#endif /* HAVE_SUBSHELL_SUPPORT */
    }
}

/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */

/** Define this function for glib-style error handling */
GQuark
mc_main_error_quark (void)
{
    return g_quark_from_static_string (PACKAGE);
}

/* --------------------------------------------------------------------------------------------- */

int
do_cd (const char *new_dir, enum cd_enum exact)
{
    gboolean res;

    res = do_panel_cd (current_panel, new_dir, exact);

#if HAVE_CHARSET
    if (res)
    {
        const char *enc_name;

        enc_name = vfs_get_encoding (current_panel->cwd);
        if (enc_name != NULL)
            current_panel->codepage = get_codepage_index (enc_name);
        else
            current_panel->codepage = SELECT_CHARSET_NO_TRANSLATE;
    }
#endif /* HAVE_CHARSET */

    return res ? 1 : 0;
}

/* --------------------------------------------------------------------------------------------- */

#ifdef HAVE_SUBSHELL_SUPPORT
int
load_prompt (int fd, void *unused)
{
    (void) fd;
    (void) unused;

    if (!read_subshell_prompt ())
        return 0;

    /* Don't actually change the prompt if it's invisible */
    if (((Dlg_head *) top_dlg->data == midnight_dlg) && command_prompt)
    {
        char *tmp_prompt;
        int prompt_len;

        tmp_prompt = strip_ctrl_codes (subshell_prompt);
        prompt_len = str_term_width1 (tmp_prompt);

        /* Check for prompts too big */
        if (COLS > 8 && prompt_len > COLS - 8)
        {
            prompt_len = COLS - 8;
            tmp_prompt[prompt_len] = '\0';
        }
        mc_prompt = tmp_prompt;
        label_set_text (the_prompt, mc_prompt);
        input_set_origin ((WInput *) cmdline, prompt_len, COLS - prompt_len);

        /* since the prompt has changed, and we are called from one of the
         * tty_get_event channels, the prompt updating does not take place
         * automatically: force a cursor update and a screen refresh
         */
        update_cursor (midnight_dlg);
        mc_refresh ();
    }
    update_subshell_prompt = TRUE;
    return 0;
}
#endif /* HAVE_SUBSHELL_SUPPORT */

/* --------------------------------------------------------------------------------------------- */

/** Show current directory in the xterm title */
void
update_xterm_title_path (void)
{
    /* TODO: share code with midnight_get_title () */

    const char *path;
    char host[BUF_TINY];
    char *p;
    struct passwd *pw = NULL;
    char *login = NULL;
    int res = 0;

    if (xterm_flag && xterm_title)
    {
        path = strip_home_and_password (current_panel->cwd);
        res = gethostname (host, sizeof (host));
        if (res)
        {                       /* On success, res = 0 */
            host[0] = '\0';
        }
        else
        {
            host[sizeof (host) - 1] = '\0';
        }
        pw = getpwuid (getuid ());
        if (pw)
        {
            login = g_strdup_printf ("%s@%s", pw->pw_name, host);
        }
        else
        {
            login = g_strdup (host);
        }
        p = g_strdup_printf ("mc [%s]:%s", login, path);
        fprintf (stdout, "\33]0;%s\7", str_term_form (p));
        g_free (login);
        g_free (p);
        if (!alternate_plus_minus)
            numeric_keypad_mode ();
        fflush (stdout);
    }
}

/* --------------------------------------------------------------------------------------------- */

int
main (int argc, char *argv[])
{
    struct stat s;
    char *mc_dir;
    GError *error = NULL;
    gboolean isInitialized;

    /* We had LC_CTYPE before, LC_ALL includs LC_TYPE as well */
    setlocale (LC_ALL, "");
    bindtextdomain ("mc", LOCALEDIR);
    textdomain ("mc");

    /* Set up temporary directory */
    mc_tmpdir ();

    OS_Setup ();

    str_init_strings (NULL);

    vfs_init ();

    if (!mc_args_handle (argc, argv, "mc"))
        exit (EXIT_FAILURE);

    /* NOTE: This has to be called before tty_init or whatever routine
       calls any define_sequence */
    init_key ();

    /* Must be done before installing the SIGCHLD handler [[FIXME]] */
    handle_console (CONSOLE_INIT);

#ifdef HAVE_SUBSHELL_SUPPORT
    /* Don't use subshell when invoked as viewer or editor */
    if (mc_run_mode != MC_RUN_FULL)
        use_subshell = 0;

    if (use_subshell)
        subshell_get_console_attributes ();
#endif /* HAVE_SUBSHELL_SUPPORT */

    /* Install the SIGCHLD handler; must be done before init_subshell() */
    init_sigchld ();

    /* We need this, since ncurses endwin () doesn't restore the signals */
    save_stop_handler ();

    /* Must be done before init_subshell, to set up the terminal size: */
    /* FIXME: Should be removed and LINES and COLS computed on subshell */
    tty_init ((gboolean) mc_args__slow_terminal, (gboolean) mc_args__ugly_line_drawing);

    load_setup ();

    /* start check display_codepage and source_codepage */
    check_codeset ();

    /* Removing this from the X code let's us type C-c */
    load_key_defs ();

    load_keymap_defs ();

    tty_init_colors (mc_args__disable_colors, mc_args__force_colors);
    isInitialized = mc_skin_init (&error);
    mc_filehighlight = mc_fhl_new (TRUE);
    dlg_set_default_colors ();

    if (!isInitialized)
    {
        message (D_ERROR, _("Warning"), "%s", error->message);
        g_error_free (error);
        error = NULL;
    }

    /* create home directory */
    /* do it after the screen library initialization to show the error message */
    mc_dir = g_build_filename (home_dir, MC_USERCONF_DIR, (char *) NULL);
    canonicalize_pathname (mc_dir);
    if ((stat (mc_dir, &s) != 0) && (errno == ENOENT) && mkdir (mc_dir, 0700) != 0)
        message (D_ERROR, _("Warning"), _("Cannot create %s directory"), mc_dir);
    g_free (mc_dir);

#ifdef HAVE_SUBSHELL_SUPPORT
    /* Done here to ensure that the subshell doesn't  */
    /* inherit the file descriptors opened below, etc */
    if (use_subshell)
        init_subshell ();

#endif /* HAVE_SUBSHELL_SUPPORT */

    /* Also done after init_subshell, to save any shell init file messages */
    if (console_flag)
        handle_console (CONSOLE_SAVE);

    if (alternate_plus_minus)
        application_keypad_mode ();

#ifdef HAVE_SUBSHELL_SUPPORT
    if (use_subshell)
    {
        mc_prompt = strip_ctrl_codes (subshell_prompt);
        if (mc_prompt == NULL)
            mc_prompt = (geteuid () == 0) ? "# " : "$ ";
    }
    else
#endif /* HAVE_SUBSHELL_SUPPORT */
        mc_prompt = (geteuid () == 0) ? "# " : "$ ";

    /* Program main loop */
    if (!midnight_shutdown)
        do_nc ();

    /* Save the tree store */
    tree_store_save ();

    free_keymap_defs ();

    /* Virtual File System shutdown */
    vfs_shut ();

    flush_extension_file ();    /* does only free memory */

    mc_fhl_free (&mc_filehighlight);
    mc_skin_deinit ();
    tty_colors_done ();

    tty_shutdown ();

    done_setup ();

    if (console_flag && (quit & SUBSHELL_EXIT) == 0)
        handle_console (CONSOLE_RESTORE);
    if (alternate_plus_minus)
        numeric_keypad_mode ();

    signal (SIGCHLD, SIG_DFL);  /* Disable the SIGCHLD handler */

    if (console_flag)
        handle_console (CONSOLE_DONE);

    if (mc_run_mode == MC_RUN_FULL && mc_args__last_wd_file != NULL
        && last_wd_string != NULL && !print_last_revert)
    {
        int last_wd_fd;

        last_wd_fd = open (mc_args__last_wd_file, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,
                           S_IRUSR | S_IWUSR);
         if (last_wd_fd != -1)
        {
            ssize_t ret1;
            int ret2;
            ret1 = write (last_wd_fd, last_wd_string, strlen (last_wd_string));
            ret2 = close (last_wd_fd);
        }
    }
    g_free (last_wd_string);

    g_free (mc_home_alt);
    g_free (mc_home);
    g_free (shell);

    done_key ();

    str_uninit_strings ();

    g_free (mc_run_param0);
    g_free (mc_run_param1);

    putchar ('\n');             /* Hack to make shell's prompt start at left of screen */

    return 0;
}

/* --------------------------------------------------------------------------------------------- */