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proc_files.c

/*
 * proc_files.c - shows ALSA system information files
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include "aconfig.h"
#include <assert.h>
#include <menu.h>
#include <unistd.h>
#include "gettext_curses.h"
#include "utils.h"
#include "die.h"
#include "mem.h"
#include "colors.h"
#include "widget.h"
#include "textbox.h"
#include "proc_files.h"

static struct widget proc_widget;
static ITEM *items[7];
static unsigned int items_count;
static MENU *menu;

static void on_menu_key(int key)
{
      static const struct {
            int key;
            int request;
      } key_map[] = {
            { KEY_DOWN, REQ_DOWN_ITEM },
            { KEY_UP, REQ_UP_ITEM },
            { KEY_HOME, REQ_FIRST_ITEM },
            { KEY_NPAGE, REQ_SCR_DPAGE },
            { KEY_PPAGE, REQ_SCR_UPAGE },
            { KEY_BEG, REQ_FIRST_ITEM },
            { KEY_END, REQ_LAST_ITEM },
      };
      unsigned int i;

      for (i = 0; i < ARRAY_SIZE(key_map); ++i)
            if (key_map[i].key == key) {
                  menu_driver(menu, key_map[i].request);
                  break;
            }
}

static void on_handle_key(int key)
{
      ITEM *item;

      switch (key) {
      case 27:
      case KEY_CANCEL:
            proc_widget.close();
            break;
      case 10:
      case 13:
      case KEY_ENTER:
            item = current_item(menu);
            if (item)
                  show_textfile(item_name(item));
            break;
      default:
            on_menu_key(key);
            break;
      }
}

static bool create(void)
{
      int rows, columns;
      const char *title;

      if (screen_lines < 3 || screen_cols < 20) {
            proc_widget.close();
            beep();
            return FALSE;
      }
      scale_menu(menu, &rows, &columns);
      rows += 2;
      columns += 2;
      if (rows > screen_lines)
            rows = screen_lines;
      if (columns > screen_cols)
            columns = screen_cols;

      widget_init(&proc_widget, rows, columns, SCREEN_CENTER, SCREEN_CENTER,
                attr_menu, WIDGET_BORDER | WIDGET_SUBWINDOW);

      title = _("Select File");
      mvwprintw(proc_widget.window, 0, (columns - 2 - get_mbs_width(title)) / 2, " %s ", title);
      set_menu_win(menu, proc_widget.window);
      set_menu_sub(menu, proc_widget.subwindow);
      return TRUE;
}

static void on_window_size_changed(void)
{
      unpost_menu(menu);
      if (!create())
            return;
      post_menu(menu);
}

static void on_close(void)
{
      unsigned int i;

      unpost_menu(menu);
      free_menu(menu);
      for (i = 0; i < items_count; ++i)
            free_item(items[i]);
      widget_free(&proc_widget);
}

static void add_item(const char *file_name)
{
      if (access(file_name, F_OK) == 0) {
            items[items_count] = new_item(file_name, NULL);
            if (!items[items_count])
                  fatal_error("cannot create menu item");
            ++items_count;
            assert(items_count < ARRAY_SIZE(items));
      }
}

static struct widget proc_widget = {
      .handle_key = on_handle_key,
      .window_size_changed = on_window_size_changed,
      .close = on_close,
};

void create_proc_files_list(void)
{
      items_count = 0;
      add_item("/proc/asound/version");
      add_item("/proc/asound/cards");
      add_item("/proc/asound/devices");
      add_item("/proc/asound/oss/devices");
      add_item("/proc/asound/timers");
      add_item("/proc/asound/pcm");
      items[items_count] = NULL;

      menu = new_menu(items);
      if (!menu)
            fatal_error("cannot create menu");
      set_menu_fore(menu, attr_menu_selected);
      set_menu_back(menu, attr_menu);
      set_menu_mark(menu, NULL);
      menu_opts_off(menu, O_SHOWDESC);

      if (!create())
            return;

      post_menu(menu);
}

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