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util.c

/*
 *  util.c
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdarg.h>

#include "dialog.h"

struct dialog_info dlg;

static void set_mono_theme(void)
{
      dlg.screen.atr = A_NORMAL;
      dlg.shadow.atr = A_NORMAL;
      dlg.dialog.atr = A_NORMAL;
      dlg.title.atr = A_BOLD;
      dlg.border.atr = A_NORMAL;
      dlg.button_active.atr = A_REVERSE;
      dlg.button_inactive.atr = A_DIM;
      dlg.button_key_active.atr = A_REVERSE;
      dlg.button_key_inactive.atr = A_BOLD;
      dlg.button_label_active.atr = A_REVERSE;
      dlg.button_label_inactive.atr = A_NORMAL;
      dlg.inputbox.atr = A_NORMAL;
      dlg.inputbox_border.atr = A_NORMAL;
      dlg.searchbox.atr = A_NORMAL;
      dlg.searchbox_title.atr = A_BOLD;
      dlg.searchbox_border.atr = A_NORMAL;
      dlg.position_indicator.atr = A_BOLD;
      dlg.menubox.atr = A_NORMAL;
      dlg.menubox_border.atr = A_NORMAL;
      dlg.item.atr = A_NORMAL;
      dlg.item_selected.atr = A_REVERSE;
      dlg.tag.atr = A_BOLD;
      dlg.tag_selected.atr = A_REVERSE;
      dlg.tag_key.atr = A_BOLD;
      dlg.tag_key_selected.atr = A_REVERSE;
      dlg.check.atr = A_BOLD;
      dlg.check_selected.atr = A_REVERSE;
      dlg.uarrow.atr = A_BOLD;
      dlg.darrow.atr = A_BOLD;
}

#define DLG_COLOR(dialog, f, b, h) \
do {                               \
      dlg.dialog.fg = (f);       \
      dlg.dialog.bg = (b);       \
      dlg.dialog.hl = (h);       \
} while (0)

static void set_classic_theme(void)
{
      DLG_COLOR(screen,                COLOR_CYAN,   COLOR_BLUE,   true);
      DLG_COLOR(shadow,                COLOR_BLACK,  COLOR_BLACK,  true);
      DLG_COLOR(dialog,                COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(title,                 COLOR_YELLOW, COLOR_WHITE,  true);
      DLG_COLOR(border,                COLOR_WHITE,  COLOR_WHITE,  true);
      DLG_COLOR(button_active,         COLOR_WHITE,  COLOR_BLUE,   true);
      DLG_COLOR(button_inactive,       COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(button_key_active,     COLOR_WHITE,  COLOR_BLUE,   true);
      DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_WHITE,  false);
      DLG_COLOR(button_label_active,   COLOR_YELLOW, COLOR_BLUE,   true);
      DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_WHITE,  true);
      DLG_COLOR(inputbox,              COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(inputbox_border,       COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(searchbox,             COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(searchbox_title,       COLOR_YELLOW, COLOR_WHITE,  true);
      DLG_COLOR(searchbox_border,      COLOR_WHITE,  COLOR_WHITE,  true);
      DLG_COLOR(position_indicator,    COLOR_YELLOW, COLOR_WHITE,  true);
      DLG_COLOR(menubox,               COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(menubox_border,        COLOR_WHITE,  COLOR_WHITE,  true);
      DLG_COLOR(item,                  COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(item_selected,         COLOR_WHITE,  COLOR_BLUE,   true);
      DLG_COLOR(tag,                   COLOR_YELLOW, COLOR_WHITE,  true);
      DLG_COLOR(tag_selected,          COLOR_YELLOW, COLOR_BLUE,   true);
      DLG_COLOR(tag_key,               COLOR_YELLOW, COLOR_WHITE,  true);
      DLG_COLOR(tag_key_selected,      COLOR_YELLOW, COLOR_BLUE,   true);
      DLG_COLOR(check,                 COLOR_BLACK,  COLOR_WHITE,  false);
      DLG_COLOR(check_selected,        COLOR_WHITE,  COLOR_BLUE,   true);
      DLG_COLOR(uarrow,                COLOR_GREEN,  COLOR_WHITE,  true);
      DLG_COLOR(darrow,                COLOR_GREEN,  COLOR_WHITE,  true);
}

static void set_blackbg_theme(void)
{
      DLG_COLOR(screen, COLOR_RED,   COLOR_BLACK, true);
      DLG_COLOR(shadow, COLOR_BLACK, COLOR_BLACK, false);
      DLG_COLOR(dialog, COLOR_WHITE, COLOR_BLACK, false);
      DLG_COLOR(title,  COLOR_RED,   COLOR_BLACK, false);
      DLG_COLOR(border, COLOR_BLACK, COLOR_BLACK, true);

      DLG_COLOR(button_active,         COLOR_YELLOW, COLOR_RED,   false);
      DLG_COLOR(button_inactive,       COLOR_YELLOW, COLOR_BLACK, false);
      DLG_COLOR(button_key_active,     COLOR_YELLOW, COLOR_RED,   true);
      DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_BLACK, false);
      DLG_COLOR(button_label_active,   COLOR_WHITE,  COLOR_RED,   false);
      DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_BLACK, true);

      DLG_COLOR(inputbox,         COLOR_YELLOW, COLOR_BLACK, false);
      DLG_COLOR(inputbox_border,  COLOR_YELLOW, COLOR_BLACK, false);

      DLG_COLOR(searchbox,        COLOR_YELLOW, COLOR_BLACK, false);
      DLG_COLOR(searchbox_title,  COLOR_YELLOW, COLOR_BLACK, true);
      DLG_COLOR(searchbox_border, COLOR_BLACK,  COLOR_BLACK, true);

      DLG_COLOR(position_indicator, COLOR_RED, COLOR_BLACK,  false);

      DLG_COLOR(menubox,          COLOR_YELLOW, COLOR_BLACK, false);
      DLG_COLOR(menubox_border,   COLOR_BLACK,  COLOR_BLACK, true);

      DLG_COLOR(item,             COLOR_WHITE, COLOR_BLACK, false);
      DLG_COLOR(item_selected,    COLOR_WHITE, COLOR_RED,   false);

      DLG_COLOR(tag,              COLOR_RED,    COLOR_BLACK, false);
      DLG_COLOR(tag_selected,     COLOR_YELLOW, COLOR_RED,   true);
      DLG_COLOR(tag_key,          COLOR_RED,    COLOR_BLACK, false);
      DLG_COLOR(tag_key_selected, COLOR_YELLOW, COLOR_RED,   true);

      DLG_COLOR(check,            COLOR_YELLOW, COLOR_BLACK, false);
      DLG_COLOR(check_selected,   COLOR_YELLOW, COLOR_RED,   true);

      DLG_COLOR(uarrow, COLOR_RED, COLOR_BLACK, false);
      DLG_COLOR(darrow, COLOR_RED, COLOR_BLACK, false);
}

static void set_bluetitle_theme(void)
{
      set_classic_theme();
      DLG_COLOR(title,               COLOR_BLUE,   COLOR_WHITE, true);
      DLG_COLOR(button_key_active,   COLOR_YELLOW, COLOR_BLUE,  true);
      DLG_COLOR(button_label_active, COLOR_WHITE,  COLOR_BLUE,  true);
      DLG_COLOR(searchbox_title,     COLOR_BLUE,   COLOR_WHITE, true);
      DLG_COLOR(position_indicator,  COLOR_BLUE,   COLOR_WHITE, true);
      DLG_COLOR(tag,                 COLOR_BLUE,   COLOR_WHITE, true);
      DLG_COLOR(tag_key,             COLOR_BLUE,   COLOR_WHITE, true);

}

/*
 * Select color theme
 */
static int set_theme(const char *theme)
{
      int use_color = 1;
      if (!theme)
            set_bluetitle_theme();
      else if (strcmp(theme, "classic") == 0)
            set_classic_theme();
      else if (strcmp(theme, "bluetitle") == 0)
            set_bluetitle_theme();
      else if (strcmp(theme, "blackbg") == 0)
            set_blackbg_theme();
      else if (strcmp(theme, "mono") == 0)
            use_color = 0;

      return use_color;
}

static void init_one_color(struct dialog_color *color)
{
      static int pair = 0;

      pair++;
      init_pair(pair, color->fg, color->bg);
      if (color->hl)
            color->atr = A_BOLD | COLOR_PAIR(pair);
      else
            color->atr = COLOR_PAIR(pair);
}

static void init_dialog_colors(void)
{
      init_one_color(&dlg.screen);
      init_one_color(&dlg.shadow);
      init_one_color(&dlg.dialog);
      init_one_color(&dlg.title);
      init_one_color(&dlg.border);
      init_one_color(&dlg.button_active);
      init_one_color(&dlg.button_inactive);
      init_one_color(&dlg.button_key_active);
      init_one_color(&dlg.button_key_inactive);
      init_one_color(&dlg.button_label_active);
      init_one_color(&dlg.button_label_inactive);
      init_one_color(&dlg.inputbox);
      init_one_color(&dlg.inputbox_border);
      init_one_color(&dlg.searchbox);
      init_one_color(&dlg.searchbox_title);
      init_one_color(&dlg.searchbox_border);
      init_one_color(&dlg.position_indicator);
      init_one_color(&dlg.menubox);
      init_one_color(&dlg.menubox_border);
      init_one_color(&dlg.item);
      init_one_color(&dlg.item_selected);
      init_one_color(&dlg.tag);
      init_one_color(&dlg.tag_selected);
      init_one_color(&dlg.tag_key);
      init_one_color(&dlg.tag_key_selected);
      init_one_color(&dlg.check);
      init_one_color(&dlg.check_selected);
      init_one_color(&dlg.uarrow);
      init_one_color(&dlg.darrow);
}

/*
 * Setup for color display
 */
static void color_setup(const char *theme)
{
      int use_color;

      use_color = set_theme(theme);
      if (use_color && has_colors()) {
            start_color();
            init_dialog_colors();
      } else
            set_mono_theme();
}

/*
 * Set window to attribute 'attr'
 */
void attr_clear(WINDOW * win, int height, int width, chtype attr)
{
      int i, j;

      wattrset(win, attr);
      for (i = 0; i < height; i++) {
            wmove(win, i, 0);
            for (j = 0; j < width; j++)
                  waddch(win, ' ');
      }
      touchwin(win);
}

void dialog_clear(void)
{
      attr_clear(stdscr, LINES, COLS, dlg.screen.atr);
      /* Display background title if it exists ... - SLH */
      if (dlg.backtitle != NULL) {
            int i;

            wattrset(stdscr, dlg.screen.atr);
            mvwaddstr(stdscr, 0, 1, (char *)dlg.backtitle);
            wmove(stdscr, 1, 1);
            for (i = 1; i < COLS - 1; i++)
                  waddch(stdscr, ACS_HLINE);
      }
      wnoutrefresh(stdscr);
}

/*
 * Do some initialization for dialog
 */
int init_dialog(const char *backtitle)
{
      int height, width;

      initscr();        /* Init curses */
      getmaxyx(stdscr, height, width);
      if (height < 19 || width < 80) {
            endwin();
            return -ERRDISPLAYTOOSMALL;
      }

      dlg.backtitle = backtitle;
      color_setup(getenv("MENUCONFIG_COLOR"));

      keypad(stdscr, TRUE);
      cbreak();
      noecho();
      dialog_clear();

      return 0;
}

void set_dialog_backtitle(const char *backtitle)
{
      dlg.backtitle = backtitle;
}

/*
 * End using dialog functions.
 */
void end_dialog(int x, int y)
{
      /* move cursor back to original position */
      move(y, x);
      refresh();
      endwin();
}

/* Print the title of the dialog. Center the title and truncate
 * tile if wider than dialog (- 2 chars).
 **/
void print_title(WINDOW *dialog, const char *title, int width)
{
      if (title) {
            int tlen = MIN(width - 2, strlen(title));
            wattrset(dialog, dlg.title.atr);
            mvwaddch(dialog, 0, (width - tlen) / 2 - 1, ' ');
            mvwaddnstr(dialog, 0, (width - tlen)/2, title, tlen);
            waddch(dialog, ' ');
      }
}

/*
 * Print a string of text in a window, automatically wrap around to the
 * next line if the string is too long to fit on one line. Newline
 * characters '\n' are replaced by spaces.  We start on a new line
 * if there is no room for at least 4 nonblanks following a double-space.
 */
void print_autowrap(WINDOW * win, const char *prompt, int width, int y, int x)
{
      int newl, cur_x, cur_y;
      int i, prompt_len, room, wlen;
      char tempstr[MAX_LEN + 1], *word, *sp, *sp2;

      strcpy(tempstr, prompt);

      prompt_len = strlen(tempstr);

      /*
       * Remove newlines
       */
      for (i = 0; i < prompt_len; i++) {
            if (tempstr[i] == '\n')
                  tempstr[i] = ' ';
      }

      if (prompt_len <= width - x * 2) {  /* If prompt is short */
            wmove(win, y, (width - prompt_len) / 2);
            waddstr(win, tempstr);
      } else {
            cur_x = x;
            cur_y = y;
            newl = 1;
            word = tempstr;
            while (word && *word) {
                  sp = strchr(word, ' ');
                  if (sp)
                        *sp++ = 0;

                  /* Wrap to next line if either the word does not fit,
                     or it is the first word of a new sentence, and it is
                     short, and the next word does not fit. */
                  room = width - cur_x;
                  wlen = strlen(word);
                  if (wlen > room ||
                      (newl && wlen < 4 && sp
                       && wlen + 1 + strlen(sp) > room
                       && (!(sp2 = strchr(sp, ' '))
                         || wlen + 1 + (sp2 - sp) > room))) {
                        cur_y++;
                        cur_x = x;
                  }
                  wmove(win, cur_y, cur_x);
                  waddstr(win, word);
                  getyx(win, cur_y, cur_x);
                  cur_x++;
                  if (sp && *sp == ' ') {
                        cur_x++;    /* double space */
                        while (*++sp == ' ') ;
                        newl = 1;
                  } else
                        newl = 0;
                  word = sp;
            }
      }
}

/*
 * Print a button
 */
void print_button(WINDOW * win, const char *label, int y, int x, int selected)
{
      int i, temp;

      wmove(win, y, x);
      wattrset(win, selected ? dlg.button_active.atr
             : dlg.button_inactive.atr);
      waddstr(win, "<");
      temp = strspn(label, " ");
      label += temp;
      wattrset(win, selected ? dlg.button_label_active.atr
             : dlg.button_label_inactive.atr);
      for (i = 0; i < temp; i++)
            waddch(win, ' ');
      wattrset(win, selected ? dlg.button_key_active.atr
             : dlg.button_key_inactive.atr);
      waddch(win, label[0]);
      wattrset(win, selected ? dlg.button_label_active.atr
             : dlg.button_label_inactive.atr);
      waddstr(win, (char *)label + 1);
      wattrset(win, selected ? dlg.button_active.atr
             : dlg.button_inactive.atr);
      waddstr(win, ">");
      wmove(win, y, x + temp + 1);
}

/*
 * Draw a rectangular box with line drawing characters
 */
void
draw_box(WINDOW * win, int y, int x, int height, int width,
       chtype box, chtype border)
{
      int i, j;

      wattrset(win, 0);
      for (i = 0; i < height; i++) {
            wmove(win, y + i, x);
            for (j = 0; j < width; j++)
                  if (!i && !j)
                        waddch(win, border | ACS_ULCORNER);
                  else if (i == height - 1 && !j)
                        waddch(win, border | ACS_LLCORNER);
                  else if (!i && j == width - 1)
                        waddch(win, box | ACS_URCORNER);
                  else if (i == height - 1 && j == width - 1)
                        waddch(win, box | ACS_LRCORNER);
                  else if (!i)
                        waddch(win, border | ACS_HLINE);
                  else if (i == height - 1)
                        waddch(win, box | ACS_HLINE);
                  else if (!j)
                        waddch(win, border | ACS_VLINE);
                  else if (j == width - 1)
                        waddch(win, box | ACS_VLINE);
                  else
                        waddch(win, box | ' ');
      }
}

/*
 * Draw shadows along the right and bottom edge to give a more 3D look
 * to the boxes
 */
void draw_shadow(WINDOW * win, int y, int x, int height, int width)
{
      int i;

      if (has_colors()) {     /* Whether terminal supports color? */
            wattrset(win, dlg.shadow.atr);
            wmove(win, y + height, x + 2);
            for (i = 0; i < width; i++)
                  waddch(win, winch(win) & A_CHARTEXT);
            for (i = y + 1; i < y + height + 1; i++) {
                  wmove(win, i, x + width);
                  waddch(win, winch(win) & A_CHARTEXT);
                  waddch(win, winch(win) & A_CHARTEXT);
            }
            wnoutrefresh(win);
      }
}

/*
 *  Return the position of the first alphabetic character in a string.
 */
int first_alpha(const char *string, const char *exempt)
{
      int i, in_paren = 0, c;

      for (i = 0; i < strlen(string); i++) {
            c = tolower(string[i]);

            if (strchr("<[(", c))
                  ++in_paren;
            if (strchr(">])", c) && in_paren > 0)
                  --in_paren;

            if ((!in_paren) && isalpha(c) && strchr(exempt, c) == 0)
                  return i;
      }

      return 0;
}

/*
 * ncurses uses ESC to detect escaped char sequences. This resutl in
 * a small timeout before ESC is actually delivered to the application.
 * lxdialog suggest <ESC> <ESC> which is correctly translated to two
 * times esc. But then we need to ignore the second esc to avoid stepping
 * out one menu too much. Filter away all escaped key sequences since
 * keypad(FALSE) turn off ncurses support for escape sequences - and thats
 * needed to make notimeout() do as expected.
 */
int on_key_esc(WINDOW *win)
{
      int key;
      int key2;
      int key3;

      nodelay(win, TRUE);
      keypad(win, FALSE);
      key = wgetch(win);
      key2 = wgetch(win);
      do {
            key3 = wgetch(win);
      } while (key3 != ERR);
      nodelay(win, FALSE);
      keypad(win, TRUE);
      if (key == KEY_ESC && key2 == ERR)
            return KEY_ESC;
      else if (key != ERR && key != KEY_ESC && key2 == ERR)
            ungetch(key);

      return -1;
}

/* redraw screen in new size */
int on_key_resize(void)
{
      dialog_clear();
      return KEY_RESIZE;
}

struct dialog_list *item_cur;
struct dialog_list item_nil;
struct dialog_list *item_head;

void item_reset(void)
{
      struct dialog_list *p, *next;

      for (p = item_head; p; p = next) {
            next = p->next;
            free(p);
      }
      item_head = NULL;
      item_cur = &item_nil;
}

void item_make(const char *fmt, ...)
{
      va_list ap;
      struct dialog_list *p = malloc(sizeof(*p));

      if (item_head)
            item_cur->next = p;
      else
            item_head = p;
      item_cur = p;
      memset(p, 0, sizeof(*p));

      va_start(ap, fmt);
      vsnprintf(item_cur->node.str, sizeof(item_cur->node.str), fmt, ap);
      va_end(ap);
}

void item_add_str(const char *fmt, ...)
{
      va_list ap;
        size_t avail;

      avail = sizeof(item_cur->node.str) - strlen(item_cur->node.str);

      va_start(ap, fmt);
      vsnprintf(item_cur->node.str + strlen(item_cur->node.str),
              avail, fmt, ap);
      item_cur->node.str[sizeof(item_cur->node.str) - 1] = '\0';
      va_end(ap);
}

void item_set_tag(char tag)
{
      item_cur->node.tag = tag;
}
void item_set_data(void *ptr)
{
      item_cur->node.data = ptr;
}

void item_set_selected(int val)
{
      item_cur->node.selected = val;
}

int item_activate_selected(void)
{
      item_foreach()
            if (item_is_selected())
                  return 1;
      return 0;
}

void *item_data(void)
{
      return item_cur->node.data;
}

char item_tag(void)
{
      return item_cur->node.tag;
}

int item_count(void)
{
      int n = 0;
      struct dialog_list *p;

      for (p = item_head; p; p = p->next)
            n++;
      return n;
}

void item_set(int n)
{
      int i = 0;
      item_foreach()
            if (i++ == n)
                  return;
}

int item_n(void)
{
      int n = 0;
      struct dialog_list *p;

      for (p = item_head; p; p = p->next) {
            if (p == item_cur)
                  return n;
            n++;
      }
      return 0;
}

const char *item_str(void)
{
      return item_cur->node.str;
}

int item_is_selected(void)
{
      return (item_cur->node.selected != 0);
}

int item_is_tag(char tag)
{
      return (item_cur->node.tag == tag);
}

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