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browser.c

/* $Id: browser.c,v 1.116 2006/12/11 22:11:32 dolorous Exp $ */
/**************************************************************************
 *   browser.c                                                            *
 *                                                                        *
 *   Copyright (C) 2001, 2002, 2003, 2004 Chris Allegretta                *
 *   Copyright (C) 2005, 2006 David Lawrence Ramsey                       *
 *   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, 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 St, Fifth Floor, Boston, MA            *
 *   02110-1301, USA.                                                     *
 *                                                                        *
 **************************************************************************/

#include "proto.h"

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#ifndef DISABLE_BROWSER

static char **filelist = NULL;
      /* The list of files to display in the file browser. */
static size_t filelist_len = 0;
      /* The number of files in the list. */
static int width = 0;
      /* The number of files that we can display per line. */
static int longest = 0;
      /* The number of columns in the longest filename in the list. */
static size_t selected = 0;
      /* The currently selected filename in the list.  This variable
       * is zero-based. */
static bool search_last_file = FALSE;
      /* Have we gone past the last file while searching? */

/* Our main file browser function.  path is the tilde-expanded path to
 * start browsing from. */
char *do_browser(char *path, DIR *dir)
{
    char *retval = NULL;
    int kbinput;
    bool meta_key, func_key, old_const_update = ISSET(CONST_UPDATE);
    bool abort = FALSE;
      /* Whether we should abort the file browser. */
    char *prev_dir = NULL;
      /* The directory we were in, if any, before backing up via
       * browsing to "..". */
    char *ans = NULL;
      /* The last answer the user typed on the statusbar. */
    size_t old_selected;
      /* The selected file we had before the current selected file. */

    curs_set(0);
    blank_statusbar();
#if !defined(DISABLE_HELP) || !defined(DISABLE_MOUSE)
    currshortcut = browser_list;
#endif
    bottombars(browser_list);
    wnoutrefresh(bottomwin);

    UNSET(CONST_UPDATE);

    ans = mallocstrcpy(NULL, "");

  change_browser_directory:
      /* We go here after we select a new directory. */

    /* Start with no key pressed. */
    kbinput = ERR;

    path = mallocstrassn(path, get_full_path(path));

    assert(path != NULL && path[strlen(path) - 1] == '/');

    /* Get the file list, and set longest and width in the process. */
    browser_init(path, dir);

    assert(filelist != NULL);

    /* Sort the file list. */
    qsort(filelist, filelist_len, sizeof(char *), diralphasort);

    /* If prev_dir isn't NULL, select the directory saved in it, and
     * then blow it away. */
    if (prev_dir != NULL) {
      browser_select_filename(prev_dir);

      free(prev_dir);
      prev_dir = NULL;
    /* Otherwise, select the first file or directory in the list. */
    } else
      selected = 0;

    old_selected = (size_t)-1;

    titlebar(path);

    while (!abort) {
      struct stat st;
      int i;
      size_t fileline = selected / width;
            /* The line number the selected file is on. */
      char *new_path;
            /* The path we switch to at the "Go to Directory"
             * prompt. */

      /* Display the file list if we don't have a key, or if the
       * selected file has changed, and set width in the process. */
      if (kbinput == ERR || old_selected != selected)
          browser_refresh();

      old_selected = selected;

      kbinput = get_kbinput(edit, &meta_key, &func_key);
      parse_browser_input(&kbinput, &meta_key, &func_key);

      switch (kbinput) {
#ifndef DISABLE_MOUSE
          case KEY_MOUSE:
            {
                int mouse_x, mouse_y;

                if (!get_mouseinput(&mouse_x, &mouse_y, TRUE)) {
                  /* We can click in the edit window to select a
                   * filename. */
                  if (wenclose(edit, mouse_y, mouse_x)) {
                      /* Subtract out the size of topwin. */
                      mouse_y -= 2 - no_more_space();

                      /* longest is the width of each column.
                       * There are two spaces between each
                       * column. */
                      selected = (fileline / editwinrows) *
                        (editwinrows * width) + (mouse_y *
                        width) + (mouse_x / (longest + 2));

                      /* If they clicked beyond the end of a row,
                       * select the filename at the end of that
                       * row. */
                      if (mouse_x > width * (longest + 2))
                        selected--;

                      /* If we're off the screen, select the last
                       * filename. */
                      if (selected > filelist_len - 1)
                        selected = filelist_len - 1;

                      /* If we selected the same filename as last
                       * time, put back the Enter key so that it's
                       * read in. */
                      if (old_selected == selected)
                        unget_kbinput(NANO_ENTER_KEY, FALSE,
                              FALSE);
                  }
                }
            }
            break;
#endif /* !DISABLE_MOUSE */
          /* Redraw the screen. */
          case NANO_REFRESH_KEY:
            total_redraw();
            break;
          case NANO_HELP_KEY:
#ifndef DISABLE_HELP
            do_browser_help();
            curs_set(0);
#else
            nano_disabled_msg();
#endif
            break;
          /* Search for a filename. */
          case NANO_WHEREIS_KEY:
            curs_set(1);
            do_filesearch();
            curs_set(0);
            break;
          /* Search for another filename. */
          case NANO_WHEREIS_NEXT_KEY:
            do_fileresearch();
            break;
          case NANO_PREVPAGE_KEY:
            if (selected >= (editwinrows + fileline % editwinrows) *
                  width)
                selected -= (editwinrows + fileline % editwinrows) *
                  width;
            else
                selected = 0;
            break;
          case NANO_NEXTPAGE_KEY:
            selected += (editwinrows - fileline % editwinrows) *
                  width;
            if (selected > filelist_len - 1)
                selected = filelist_len - 1;
            break;
          case NANO_FIRSTFILE_METAKEY:
            if (meta_key)
                selected = 0;
            break;
          case NANO_LASTFILE_METAKEY:
            if (meta_key)
                selected = filelist_len - 1;
            break;
          /* Go to a specific directory. */
          case NANO_GOTODIR_KEY:
            curs_set(1);

            i = do_prompt(TRUE,
#ifndef DISABLE_TABCOMP
                  FALSE,
#endif
                  gotodir_list, ans,
#ifndef NANO_TINY
                  NULL,
#endif
                  browser_refresh, _("Go To Directory"));

            curs_set(0);
#if !defined(DISABLE_HELP) || !defined(DISABLE_MOUSE)
            currshortcut = browser_list;
#endif
            bottombars(browser_list);

            /* If the directory begins with a newline (i.e. an
             * encoded null), treat it as though it's blank. */
            if (i < 0 || answer[0] == '\n') {
                /* We canceled.  Indicate that on the statusbar, and
                 * blank out ans, since we're done with it. */
                statusbar(_("Cancelled"));
                ans = mallocstrcpy(ans, "");
                break;
            } else if (i != 0) {
                /* Put back the "Go to Directory" key and save
                 * answer in ans, so that the file list is displayed
                 * again, the prompt is displayed again, and what we
                 * typed before at the prompt is displayed again. */
                unget_kbinput(NANO_GOTOLINE_KEY, FALSE, FALSE);
                ans = mallocstrcpy(ans, answer);
                break;
            }

            /* We have a directory.  Blank out ans, since we're done
             * with it. */
            ans = mallocstrcpy(ans, "");

            /* Convert newlines to nulls, just before we go to the
             * directory. */
            sunder(answer);
            align(&answer);

            new_path = real_dir_from_tilde(answer);

            if (new_path[0] != '/') {
                new_path = charealloc(new_path, strlen(path) +
                  strlen(answer) + 1);
                sprintf(new_path, "%s%s", path, answer);
            }

#ifndef DISABLE_OPERATINGDIR
            if (check_operating_dir(new_path, FALSE)) {
                statusbar(
                  _("Can't go outside of %s in restricted mode"),
                  operating_dir);
                free(new_path);
                break;
            }
#endif

            dir = opendir(new_path);
            if (dir == NULL) {
                /* We can't open this directory for some reason.
                 * Complain. */
                statusbar(_("Error reading %s: %s"), answer,
                  strerror(errno));
                beep();
                free(new_path);
                break;
            }

            /* Start over again with the new path value. */
            free(path);
            path = new_path;
            goto change_browser_directory;
          case NANO_PREVLINE_KEY:
            if (selected >= width)
                selected -= width;
            break;
          case NANO_BACK_KEY:
            if (selected > 0)
                selected--;
            break;
          case NANO_NEXTLINE_KEY:
            if (selected + width <= filelist_len - 1)
                selected += width;
            break;
          case NANO_FORWARD_KEY:
            if (selected < filelist_len - 1)
                selected++;
            break;
          case NANO_ENTER_KEY:
            /* We can't move up from "/". */
            if (strcmp(filelist[selected], "/..") == 0) {
                statusbar(_("Can't move up a directory"));
                beep();
                break;
            }

#ifndef DISABLE_OPERATINGDIR
            /* Note: The selected file can be outside the operating
             * directory if it's ".." or if it's a symlink to a
             * directory outside the operating directory. */
            if (check_operating_dir(filelist[selected], FALSE)) {
                statusbar(
                  _("Can't go outside of %s in restricted mode"),
                  operating_dir);
                beep();
                break;
            }
#endif

            if (stat(filelist[selected], &st) == -1) {
                /* We can't open this file for some reason.
                 * Complain. */
                statusbar(_("Error reading %s: %s"),
                  filelist[selected], strerror(errno));
                beep();
                break;
            }

            /* If we've successfully opened a file, we're done, so
             * get out. */
            if (!S_ISDIR(st.st_mode)) {
                retval = mallocstrcpy(NULL, filelist[selected]);
                abort = TRUE;
                break;
            /* If we've successfully opened a directory, and it's
             * "..", save the current directory in prev_dir, so that
             * we can select it later. */
            } else if (strcmp(tail(filelist[selected]), "..") == 0)
                prev_dir = mallocstrcpy(NULL,
                  striponedir(filelist[selected]));

            dir = opendir(filelist[selected]);
            if (dir == NULL) {
                /* We can't open this directory for some reason.
                 * Complain. */
                statusbar(_("Error reading %s: %s"),
                  filelist[selected], strerror(errno));
                beep();
                break;
            }

            path = mallocstrcpy(path, filelist[selected]);

            /* Start over again with the new path value. */
            goto change_browser_directory;
          /* Abort the file browser. */
          case NANO_EXIT_KEY:
            abort = TRUE;
            break;
      }
    }

    titlebar(NULL);
    edit_refresh();
    curs_set(1);
    if (old_const_update)
      SET(CONST_UPDATE);

    free(path);
    free(ans);

    free_chararray(filelist, filelist_len);
    filelist = NULL;
    filelist_len = 0;

    return retval;
}

/* The file browser front end.  We check to see if inpath has a
 * directory in it.  If it does, we start do_browser() from there.
 * Otherwise, we start do_browser() from the current directory. */
char *do_browse_from(const char *inpath)
{
    struct stat st;
    char *path;
      /* This holds the tilde-expanded version of inpath. */
    DIR *dir = NULL;

    assert(inpath != NULL);

    path = real_dir_from_tilde(inpath);

    /* Perhaps path is a directory.  If so, we'll pass it to
     * do_browser().  Or perhaps path is a directory / a file.  If so,
     * we'll try stripping off the last path element and passing it to
     * do_browser().  Or perhaps path doesn't have a directory portion
     * at all.  If so, we'll just pass the current directory to
     * do_browser(). */
    if (stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
      path = mallocstrassn(path, striponedir(path));

      if (stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
          free(path);

          path = charalloc(PATH_MAX + 1);
          path = getcwd(path, PATH_MAX + 1);

          if (path != NULL)
            align(&path);
      }
    }

#ifndef DISABLE_OPERATINGDIR
    /* If the resulting path isn't in the operating directory, use
     * the operating directory instead. */
    if (check_operating_dir(path, FALSE))
      path = mallocstrcpy(path, operating_dir);
#endif

    if (path != NULL)
      dir = opendir(path);

    /* If we can't open the path, get out. */
    if (dir == NULL) {
      if (path != NULL)
          free(path);
      beep();
      return NULL;
    }

    return do_browser(path, dir);
}

/* Set filelist to the list of files contained in the directory path,
 * set filelist_len to the number of files in that list, set longest to
 * the width in columns of the longest filename in that list (between 15
 * and COLS), and set width to the number of files that we can display
 * per line.  longest needs to be at least 15 columns in order to
 * display ".. (parent dir)", as Pico does.  Assume path exists and is a
 * directory. */
void browser_init(const char *path, DIR *dir)
{
    const struct dirent *nextdir;
    size_t i = 0, path_len = strlen(path);
    int col = 0;
      /* The maximum number of columns that the filenames will take
       * up. */
    int line = 0;
      /* The maximum number of lines that the filenames will take
       * up. */
    int filesperline = 0;
      /* The number of files that we can display per line. */

    assert(path != NULL && path[strlen(path) - 1] == '/' && dir != NULL);

    /* Set longest to zero, just before we initialize it. */
    longest = 0;

    while ((nextdir = readdir(dir)) != NULL) {
      size_t d_len;

      /* Don't show the "." entry. */
      if (strcmp(nextdir->d_name, ".") == 0)
         continue;

      d_len = strlenpt(nextdir->d_name);
      if (d_len > longest)
          longest = (d_len > COLS) ? COLS : d_len;

      i++;
    }

    rewinddir(dir);

    /* Put 10 columns' worth of blank space between columns of filenames
     * in the list whenever possible, as Pico does. */
    longest += 10;

    if (filelist != NULL)
      free_chararray(filelist, filelist_len);

    filelist_len = i;

    filelist = (char **)nmalloc(filelist_len * sizeof(char *));

    i = 0;

    while ((nextdir = readdir(dir)) != NULL && i < filelist_len) {
      /* Don't show the "." entry. */
      if (strcmp(nextdir->d_name, ".") == 0)
         continue;

      filelist[i] = charalloc(path_len + strlen(nextdir->d_name) + 1);
      sprintf(filelist[i], "%s%s", path, nextdir->d_name);

      i++;
    }

    /* Maybe the number of files in the directory changed between the
     * first time we scanned and the second.  i is the actual length of
     * filelist, so record it. */
    filelist_len = i;

    closedir(dir);

    /* Make sure longest is between 15 and COLS. */
    if (longest < 15)
      longest = 15;
    if (longest > COLS)
      longest = COLS;

    /* Set width to zero, just before we initialize it. */
    width = 0;

    for (i = 0; i < filelist_len && line < editwinrows; i++) {
      /* Calculate the number of columns one filename will take up. */
      col += longest;
      filesperline++;

      /* Add some space between the columns. */
      col += 2;

      /* If the next entry isn't going to fit on the current line,
       * move to the next line. */
      if (col > COLS - longest) {
          line++;
          col = 0;

          /* If width isn't initialized yet, and we've taken up more
           * than one line, it means that width is equal to
           * filesperline. */
          if (width == 0)
            width = filesperline;
      }
    }

    /* If width isn't initialized yet, and we've taken up only one line,
     * it means that width is equal to (COLS % longest). */
    if (width == 0)
      width = COLS % longest;
}

/* Determine the shortcut key corresponding to the values of kbinput
 * (the key itself), meta_key (whether the key is a meta sequence), and
 * func_key (whether the key is a function key), if any.  In the
 * process, convert certain non-shortcut keys into their corresponding
 * shortcut keys. */
void parse_browser_input(int *kbinput, bool *meta_key, bool *func_key)
{
    get_shortcut(browser_list, kbinput, meta_key, func_key);

    /* Pico compatibility. */
    if (!*meta_key) {
      switch (*kbinput) {
          case ' ':
            *kbinput = NANO_NEXTPAGE_KEY;
            break;
          case '-':
            *kbinput = NANO_PREVPAGE_KEY;
            break;
          case '?':
            *kbinput = NANO_HELP_KEY;
            break;
          /* Cancel is equivalent to Exit here. */
          case NANO_CANCEL_KEY:
          case 'E':
          case 'e':
            *kbinput = NANO_EXIT_KEY;
            break;
          case 'G':
          case 'g':
            *kbinput = NANO_GOTODIR_KEY;
            break;
          case 'S':
          case 's':
            *kbinput = NANO_ENTER_KEY;
            break;
          case 'W':
          case 'w':
            *kbinput = NANO_WHEREIS_KEY;
            break;
      }
    }
}

/* Set width to the number of files that we can display per line, if
 * necessary, and display the list of files. */
void browser_refresh(void)
{
    static int uimax_digits = -1;
    size_t i;
    int col = 0;
      /* The maximum number of columns that the filenames will take
       * up. */
    int line = 0;
      /* The maximum number of lines that the filenames will take
       * up. */
    char *foo;
      /* The file information that we'll display. */

    if (uimax_digits == -1)
      uimax_digits = digits(UINT_MAX);

    blank_edit();

    wmove(edit, 0, 0);

    i = width * editwinrows * ((selected / width) / editwinrows);

    for (; i < filelist_len && line < editwinrows; i++) {
      struct stat st;
      const char *filetail = tail(filelist[i]);
            /* The filename we display, minus the path. */
      size_t filetaillen = strlenpt(filetail);
            /* The length of the filename in columns. */
      size_t foolen;
            /* The length of the file information in columns. */
      int foomaxlen = 7;
            /* The maximum length of the file information in
             * columns: seven for "--", "(dir)", or the file size,
             * and 12 for "(parent dir)". */
      bool dots = (COLS >= 15 && filetaillen >= longest -
            foomaxlen - 1);
            /* Do we put an ellipsis before the filename?  Don't set
             * this to TRUE if we have fewer than 15 columns (i.e.
             * one column for padding, plus seven columns for a
             * filename other than ".."). */
      char *disp = display_string(filetail, dots ? filetaillen -
            longest + foomaxlen + 4 : 0, longest, FALSE);
            /* If we put an ellipsis before the filename, reserve
             * one column for padding, plus seven columns for "--",
             * "(dir)", or the file size, plus three columns for the
             * ellipsis. */

      /* Start highlighting the currently selected file or
       * directory. */
      if (i == selected)
          wattron(edit, reverse_attr);

      blank_line(edit, line, col, longest);

      /* If dots is TRUE, we will display something like
       * "...ename". */
      if (dots)
          mvwaddstr(edit, line, col, "...");
      mvwaddstr(edit, line, dots ? col + 3 : col, disp);

      free(disp);

      col += longest;

      /* Show information about the file.  We don't want to report
       * file sizes for links, so we use lstat(). */
      if (lstat(filelist[i], &st) == -1 || S_ISLNK(st.st_mode)) {
          /* If the file doesn't exist (i.e. it's been deleted while
           * the file browser is open), or it's a symlink that doesn't
           * point to a directory, display "--". */
          if (stat(filelist[i], &st) == -1 || !S_ISDIR(st.st_mode))
            foo = mallocstrcpy(NULL, "--");
          /* If the file is a symlink that points to a directory,
           * display it as a directory. */
          else
            /* TRANSLATORS: Try to keep this at most 7
             * characters. */
            foo = mallocstrcpy(NULL, _("(dir)"));
      } else if (S_ISDIR(st.st_mode)) {
          /* If the file is a directory, display it as such. */
          if (strcmp(filetail, "..") == 0) {
            /* TRANSLATORS: Try to keep this at most 12
             * characters. */
            foo = mallocstrcpy(NULL, _("(parent dir)"));
            foomaxlen = 12;
          } else
            foo = mallocstrcpy(NULL, _("(dir)"));
      } else {
          unsigned long result = st.st_size;
          char modifier;

          foo = charalloc(uimax_digits + 4);

          /* Bytes. */
          if (st.st_size < (1 << 10))
            modifier = ' ';
          /* Kilobytes. */
          else if (st.st_size < (1 << 20)) {
            result >>= 10;
            modifier = 'K';
          /* Megabytes. */
          } else if (st.st_size < (1 << 30)) {
            result >>= 20;
            modifier = 'M';
          /* Gigabytes. */
          } else {
            result >>= 30;
            modifier = 'G';
          }

          sprintf(foo, "%4lu %cB", result, modifier);
      }

      /* Make sure foo takes up no more than foomaxlen columns. */
      foolen = strlenpt(foo);
      if (foolen > foomaxlen) {
          null_at(&foo, actual_x(foo, foomaxlen));
          foolen = foomaxlen;
      }

      mvwaddstr(edit, line, col - foolen, foo);

      /* Finish highlighting the currently selected file or
       * directory. */
      if (i == selected)
          wattroff(edit, reverse_attr);

      free(foo);

      /* Add some space between the columns. */
      col += 2;

      /* If the next entry isn't going to fit on the current line,
       * move to the next line. */
      if (col > COLS - longest) {
          line++;
          col = 0;
      }

      wmove(edit, line, col);
    }

    wnoutrefresh(edit);
}

/* Look for needle.  If we find it, set selected to its location.  Note
 * that needle must be an exact match for a file in the list.  The
 * return value specifies whether we found anything. */
bool browser_select_filename(const char *needle)
{
    size_t currselected;
    bool found = FALSE;

    for (currselected = 0; currselected < filelist_len;
      currselected++) {
      if (strcmp(filelist[currselected], needle) == 0) {
          found = TRUE;
          break;
      }
    }

    if (found)
      selected = currselected;

    return found;
}

/* Set up the system variables for a filename search.  Return -1 if the
 * search should be canceled (due to Cancel, a blank search string, or a
 * failed regcomp()), return 0 on success, and return 1 on rerun calling
 * program. */
int filesearch_init(void)
{
    int i = 0;
    char *buf;
    static char *backupstring = NULL;
      /* The search string we'll be using. */

    /* If backupstring doesn't exist, initialize it to "". */
    if (backupstring == NULL)
      backupstring = mallocstrcpy(NULL, "");

    /* We display the search prompt below.  If the user types a partial
     * search string and then Replace or a toggle, we will return to
     * do_search() or do_replace() and be called again.  In that case,
     * we should put the same search string back up. */

    search_init_globals();

    if (last_search[0] != '\0') {
      char *disp = display_string(last_search, 0, COLS / 3, FALSE);

      buf = charalloc(strlen(disp) + 7);
      /* We use (COLS / 3) here because we need to see more on the
       * line. */
      sprintf(buf, " [%s%s]", disp,
            (strlenpt(last_search) > COLS / 3) ? "..." : "");
      free(disp);
    } else
      buf = mallocstrcpy(NULL, "");

    /* This is now one simple call.  It just does a lot. */
    i = do_prompt(FALSE,
#ifndef DISABLE_TABCOMP
      TRUE,
#endif
      whereis_file_list, backupstring,
#ifndef NANO_TINY
      &search_history,
#endif
      browser_refresh, "%s%s%s%s%s%s", _("Search"),
#ifndef NANO_TINY
      /* This string is just a modifier for the search prompt; no
       * grammar is implied. */
      ISSET(CASE_SENSITIVE) ? _(" [Case Sensitive]") :
#endif
      "",
#ifdef HAVE_REGEX_H
      /* This string is just a modifier for the search prompt; no
       * grammar is implied. */
      ISSET(USE_REGEXP) ? _(" [Regexp]") :
#endif
      "",
#ifndef NANO_TINY
      /* This string is just a modifier for the search prompt; no
       * grammar is implied. */
      ISSET(BACKWARDS_SEARCH) ? _(" [Backwards]") :
#endif
      "", "", buf);

    /* Release buf now that we don't need it anymore. */
    free(buf);

    free(backupstring);
    backupstring = NULL;

    /* Cancel any search, or just return with no previous search. */
    if (i == -1 || (i < 0 && last_search[0] == '\0') ||
          (i == 0 && answer[0] == '\0')) {
      statusbar(_("Cancelled"));
      return -1;
    } else {
      switch (i) {
          case -2:            /* It's an empty string. */
          case 0:       /* It's a new string. */
#ifdef HAVE_REGEX_H
            /* Use last_search if answer is an empty string, or
             * answer if it isn't. */
            if (ISSET(USE_REGEXP) &&
                  regexp_init((i == -2) ? last_search :
                  answer) == 0)
                return -1;
#endif
            break;
#ifndef NANO_TINY
          case TOGGLE_CASE_KEY:
            TOGGLE(CASE_SENSITIVE);
            backupstring = mallocstrcpy(backupstring, answer);
            return 1;
          case TOGGLE_BACKWARDS_KEY:
            TOGGLE(BACKWARDS_SEARCH);
            backupstring = mallocstrcpy(backupstring, answer);
            return 1;
#endif
#ifdef HAVE_REGEX_H
          case NANO_REGEXP_KEY:
            TOGGLE(USE_REGEXP);
            backupstring = mallocstrcpy(backupstring, answer);
            return 1;
#endif
          default:
            return -1;
      }
    }

    return 0;
}

/* Look for needle.  If no_sameline is TRUE, skip over selected when
 * looking for needle.  begin is the location of the filename where we
 * first started searching.  The return value specifies whether we found
 * anything. */
bool findnextfile(bool no_sameline, size_t begin, const char *needle)
{
    size_t currselected = selected;
      /* The location in the current file list of the match we
       * find. */
    const char *filetail = tail(filelist[currselected]);
      /* The filename we display, minus the path. */
    const char *rev_start = filetail, *found = NULL;

#ifndef NANO_TINY
    if (ISSET(BACKWARDS_SEARCH))
      rev_start += strlen(rev_start);
#endif

    /* Look for needle in the current filename we're searching. */
    while (TRUE) {
      found = strstrwrapper(filetail, needle, rev_start);

      /* We've found a potential match.  If we're not allowed to find
       * a match on the same filename we started on and this potential
       * match is on that line, continue searching. */
      if (found != NULL && (!no_sameline || currselected != begin))
          break;

      /* We've finished processing the filenames, so get out. */
      if (search_last_file) {
          not_found_msg(needle);
          return FALSE;
      }

      /* Move to the previous or next filename in the list.  If we've
       * reached the start or end of the list, wrap around. */
#ifndef NANO_TINY
      if (ISSET(BACKWARDS_SEARCH)) {
          if (currselected > 0)
            currselected--;
          else {
            currselected = filelist_len - 1;
            statusbar(_("Search Wrapped"));
          }
      } else {
#endif
          if (currselected < filelist_len - 1)
            currselected++;
          else {
            currselected = 0;
            statusbar(_("Search Wrapped"));
          }
#ifndef NANO_TINY
      }
#endif

      /* We've reached the original starting file. */
      if (currselected == begin)
          search_last_file = TRUE;

      filetail = tail(filelist[currselected]);

      rev_start = filetail;
#ifndef NANO_TINY
      if (ISSET(BACKWARDS_SEARCH))
          rev_start += strlen(rev_start);
#endif
    }

    /* We've definitely found something. */
    selected = currselected;

    return TRUE;
}

/* Clear the flag indicating that a search reached the last file in the
 * list.  We need to do this just before a new search. */
void findnextfile_wrap_reset(void)
{
    search_last_file = FALSE;
}

/* Abort the current filename search.  Clean up by setting the current
 * shortcut list to the browser shortcut list, displaying it, and
 * decompiling the compiled regular expression we used in the last
 * search, if any. */
void filesearch_abort(void)
{
    currshortcut = browser_list;
    bottombars(browser_list);
#ifdef HAVE_REGEX_H
    regexp_cleanup();
#endif
}

/* Search for a filename. */
void do_filesearch(void)
{
    size_t begin = selected;
    int i;
    bool didfind;

    i = filesearch_init();
    if (i == -1)  /* Cancel, blank search string, or regcomp()
                   * failed. */
      filesearch_abort();
#if !defined(NANO_TINY) || defined(HAVE_REGEX_H)
    else if (i == 1)    /* Case Sensitive, Backwards, or Regexp search
                   * toggle. */
      do_filesearch();
#endif

    if (i != 0)
      return;

    /* If answer is now "", copy last_search into answer. */
    if (answer[0] == '\0')
      answer = mallocstrcpy(answer, last_search);
    else
      last_search = mallocstrcpy(last_search, answer);

#ifndef NANO_TINY
    /* If answer is not "", add this search string to the search history
     * list. */
    if (answer[0] != '\0')
      update_history(&search_history, answer);
#endif

    findnextfile_wrap_reset();
    didfind = findnextfile(FALSE, begin, answer);

    /* Check to see if there's only one occurrence of the string and
     * we're on it now. */
    if (selected == begin && didfind) {
      /* Do the search again, skipping over the current line.  We
       * should only end up back at the same position if the string
       * isn't found again, in which case it's the only occurrence. */
      didfind = findnextfile(TRUE, begin, answer);
      if (selected == begin && !didfind)
          statusbar(_("This is the only occurrence"));
    }

    filesearch_abort();
}

/* Search for the last filename without prompting. */
void do_fileresearch(void)
{
    size_t begin = selected;
    bool didfind;

    search_init_globals();

    if (last_search[0] != '\0') {
#ifdef HAVE_REGEX_H
      /* Since answer is "", use last_search! */
      if (ISSET(USE_REGEXP) && regexp_init(last_search) == 0)
          return;
#endif

      findnextfile_wrap_reset();
      didfind = findnextfile(FALSE, begin, answer);

      /* Check to see if there's only one occurrence of the string and
       * we're on it now. */
      if (selected == begin && didfind) {
          /* Do the search again, skipping over the current line.  We
           * should only end up back at the same position if the
           * string isn't found again, in which case it's the only
           * occurrence. */
          didfind = findnextfile(TRUE, begin, answer);
          if (selected == begin && !didfind)
            statusbar(_("This is the only occurrence"));
      }
    } else
        statusbar(_("No current search pattern"));

    filesearch_abort();
}

/* Select the first file in the list. */
void do_first_file(void)
{
    selected = 0;
}

/* Select the last file in the list. */
void do_last_file(void)
{
    selected = filelist_len - 1;
}

/* Strip one directory from the end of path, and return the stripped
 * path.  The returned string is dynamically allocated, and should be
 * freed. */
char *striponedir(const char *path)
{
    char *retval, *tmp;

    assert(path != NULL);

    retval = mallocstrcpy(NULL, path);

    tmp = strrchr(retval, '/');

    if (tmp != NULL)
      null_at(&retval, tmp - retval);

    return retval;
}

#endif /* !DISABLE_BROWSER */

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