nconf.gui.c

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/*
 * Copyright (C) 2008 Nir Tzachar <[email protected]?
 * Released under the terms of the GNU GPL v2.0.
 *
 * Derived from menuconfig.
 *
 */
#include "nconf.h"

/* a list of all the different widgets we use */
attributes_t attributes[ATTR_MAX+1] = {0};

/* available colors:
   COLOR_BLACK   0
   COLOR_RED     1
   COLOR_GREEN   2
   COLOR_YELLOW  3
   COLOR_BLUE    4
   COLOR_MAGENTA 5
   COLOR_CYAN    6
   COLOR_WHITE   7
   */
static void set_normal_colors(void)
{
    init_pair(NORMAL, -1, -1);
    init_pair(MAIN_HEADING, COLOR_MAGENTA, -1);

    /* FORE is for the selected item */
    init_pair(MAIN_MENU_FORE, -1, -1);
    /* BACK for all the rest */
    init_pair(MAIN_MENU_BACK, -1, -1);
    init_pair(MAIN_MENU_GREY, -1, -1);
    init_pair(MAIN_MENU_HEADING, COLOR_GREEN, -1);
    init_pair(MAIN_MENU_BOX, COLOR_YELLOW, -1);

    init_pair(SCROLLWIN_TEXT, -1, -1);
    init_pair(SCROLLWIN_HEADING, COLOR_GREEN, -1);
    init_pair(SCROLLWIN_BOX, COLOR_YELLOW, -1);

    init_pair(DIALOG_TEXT, -1, -1);
    init_pair(DIALOG_BOX, COLOR_YELLOW, -1);
    init_pair(DIALOG_MENU_BACK, COLOR_YELLOW, -1);
    init_pair(DIALOG_MENU_FORE, COLOR_RED, -1);

    init_pair(INPUT_BOX, COLOR_YELLOW, -1);
    init_pair(INPUT_HEADING, COLOR_GREEN, -1);
    init_pair(INPUT_TEXT, -1, -1);
    init_pair(INPUT_FIELD, -1, -1);

    init_pair(FUNCTION_HIGHLIGHT, -1, -1);
    init_pair(FUNCTION_TEXT, COLOR_BLUE, -1);
}

/* available attributes:
   A_NORMAL        Normal display (no highlight)
   A_STANDOUT      Best highlighting mode of the terminal.
   A_UNDERLINE     Underlining
   A_REVERSE       Reverse video
   A_BLINK         Blinking
   A_DIM           Half bright
   A_BOLD          Extra bright or bold
   A_PROTECT       Protected mode
   A_INVIS         Invisible or blank mode
   A_ALTCHARSET    Alternate character set
   A_CHARTEXT      Bit-mask to extract a character
   COLOR_PAIR(n)   Color-pair number n
   */
static void normal_color_theme(void)
{
    /* automatically add color... */
#define mkattr(name, attr) do { \
attributes[name] = attr | COLOR_PAIR(name); } while (0)
    mkattr(NORMAL, NORMAL);
    mkattr(MAIN_HEADING, A_BOLD | A_UNDERLINE);

    mkattr(MAIN_MENU_FORE, A_REVERSE);
    mkattr(MAIN_MENU_BACK, A_NORMAL);
    mkattr(MAIN_MENU_GREY, A_NORMAL);
    mkattr(MAIN_MENU_HEADING, A_BOLD);
    mkattr(MAIN_MENU_BOX, A_NORMAL);

    mkattr(SCROLLWIN_TEXT, A_NORMAL);
    mkattr(SCROLLWIN_HEADING, A_BOLD);
    mkattr(SCROLLWIN_BOX, A_BOLD);

    mkattr(DIALOG_TEXT, A_BOLD);
    mkattr(DIALOG_BOX, A_BOLD);
    mkattr(DIALOG_MENU_FORE, A_STANDOUT);
    mkattr(DIALOG_MENU_BACK, A_NORMAL);

    mkattr(INPUT_BOX, A_NORMAL);
    mkattr(INPUT_HEADING, A_BOLD);
    mkattr(INPUT_TEXT, A_NORMAL);
    mkattr(INPUT_FIELD, A_UNDERLINE);

    mkattr(FUNCTION_HIGHLIGHT, A_BOLD);
    mkattr(FUNCTION_TEXT, A_REVERSE);
}

static void no_colors_theme(void)
{
    /* automatically add highlight, no color */
#define mkattrn(name, attr) { attributes[name] = attr; }

    mkattrn(NORMAL, NORMAL);
    mkattrn(MAIN_HEADING, A_BOLD | A_UNDERLINE);

    mkattrn(MAIN_MENU_FORE, A_STANDOUT);
    mkattrn(MAIN_MENU_BACK, A_NORMAL);
    mkattrn(MAIN_MENU_GREY, A_NORMAL);
    mkattrn(MAIN_MENU_HEADING, A_BOLD);
    mkattrn(MAIN_MENU_BOX, A_NORMAL);

    mkattrn(SCROLLWIN_TEXT, A_NORMAL);
    mkattrn(SCROLLWIN_HEADING, A_BOLD);
    mkattrn(SCROLLWIN_BOX, A_BOLD);

    mkattrn(DIALOG_TEXT, A_NORMAL);
    mkattrn(DIALOG_BOX, A_BOLD);
    mkattrn(DIALOG_MENU_FORE, A_STANDOUT);
    mkattrn(DIALOG_MENU_BACK, A_NORMAL);

    mkattrn(INPUT_BOX, A_BOLD);
    mkattrn(INPUT_HEADING, A_BOLD);
    mkattrn(INPUT_TEXT, A_NORMAL);
    mkattrn(INPUT_FIELD, A_UNDERLINE);

    mkattrn(FUNCTION_HIGHLIGHT, A_BOLD);
    mkattrn(FUNCTION_TEXT, A_REVERSE);
}

void set_colors()
{
    start_color();
    use_default_colors();
    set_normal_colors();
    if (has_colors()) {
        normal_color_theme();
    } else {
        /* give defaults */
        no_colors_theme();
    }
}


/* this changes the windows attributes !!! */
void print_in_middle(WINDOW *win,
        int starty,
        int startx,
        int width,
        const char *string,
        chtype color)
{      int length, x, y;
    float temp;


    if (win == NULL)
        win = stdscr;
    getyx(win, y, x);
    if (startx != 0)
        x = startx;
    if (starty != 0)
        y = starty;
    if (width == 0)
        width = 80;

    length = strlen(string);
    temp = (width - length) / 2;
    x = startx + (int)temp;
    (void) wattrset(win, color);
    mvwprintw(win, y, x, "%s", string);
    refresh();
}

int get_line_no(const char *text)
{
    int i;
    int total = 1;

    if (!text)
        return 0;

    for (i = 0; text[i] != '\0'; i++)
        if (text[i] == '\n')
            total++;
    return total;
}

const char *get_line(const char *text, int line_no)
{
    int i;
    int lines = 0;

    if (!text)
        return 0;

    for (i = 0; text[i] != '\0' && lines < line_no; i++)
        if (text[i] == '\n')
            lines++;
    return text+i;
}

int get_line_length(const char *line)
{
    int res = 0;
    while (*line != '\0' && *line != '\n') {
        line++;
        res++;
    }
    return res;
}

/* print all lines to the window. */
void fill_window(WINDOW *win, const char *text)
{
    int x, y;
    int total_lines = get_line_no(text);
    int i;

    getmaxyx(win, y, x);
    /* do not go over end of line */
    total_lines = min(total_lines, y);
    for (i = 0; i < total_lines; i++) {
        char tmp[x+10];
        const char *line = get_line(text, i);
        int len = get_line_length(line);
        strncpy(tmp, line, min(len, x));
        tmp[len] = '\0';
        mvwprintw(win, i, 0, "%s", tmp);
    }
}

/* get the message, and buttons.
 * each button must be a char*
 * return the selected button
 *
 * this dialog is used for 2 different things:
 * 1) show a text box, no buttons.
 * 2) show a dialog, with horizontal buttons
 */
int btn_dialog(WINDOW *main_window, const char *msg, int btn_num, ...)
{
    va_list ap;
    char *btn;
    int btns_width = 0;
    int msg_lines = 0;
    int msg_width = 0;
    int total_width;
    int win_rows = 0;
    WINDOW *win;
    WINDOW *msg_win;
    WINDOW *menu_win;
    MENU *menu;
    ITEM *btns[btn_num+1];
    int i, x, y;
    int res = -1;


    va_start(ap, btn_num);
    for (i = 0; i < btn_num; i++) {
        btn = va_arg(ap, char *);
        btns[i] = new_item(btn, "");
        btns_width += strlen(btn)+1;
    }
    va_end(ap);
    btns[btn_num] = NULL;

    /* find the widest line of msg: */
    msg_lines = get_line_no(msg);
    for (i = 0; i < msg_lines; i++) {
        const char *line = get_line(msg, i);
        int len = get_line_length(line);
        if (msg_width < len)
            msg_width = len;
    }

    total_width = max(msg_width, btns_width);
    /* place dialog in middle of screen */
    y = (LINES-(msg_lines+4))/2;
    x = (COLS-(total_width+4))/2;


    /* create the windows */
    if (btn_num > 0)
        win_rows = msg_lines+4;
    else
        win_rows = msg_lines+2;

    win = newwin(win_rows, total_width+4, y, x);
    keypad(win, TRUE);
    menu_win = derwin(win, 1, btns_width, win_rows-2,
            1+(total_width+2-btns_width)/2);
    menu = new_menu(btns);
    msg_win = derwin(win, win_rows-2, msg_width, 1,
            1+(total_width+2-msg_width)/2);

    set_menu_fore(menu, attributes[DIALOG_MENU_FORE]);
    set_menu_back(menu, attributes[DIALOG_MENU_BACK]);

    (void) wattrset(win, attributes[DIALOG_BOX]);
    box(win, 0, 0);

    /* print message */
    (void) wattrset(msg_win, attributes[DIALOG_TEXT]);
    fill_window(msg_win, msg);

    set_menu_win(menu, win);
    set_menu_sub(menu, menu_win);
    set_menu_format(menu, 1, btn_num);
    menu_opts_off(menu, O_SHOWDESC);
    menu_opts_off(menu, O_SHOWMATCH);
    menu_opts_on(menu, O_ONEVALUE);
    menu_opts_on(menu, O_NONCYCLIC);
    set_menu_mark(menu, "");
    post_menu(menu);


    touchwin(win);
    refresh_all_windows(main_window);
    while ((res = wgetch(win))) {
        switch (res) {
        case KEY_LEFT:
            menu_driver(menu, REQ_LEFT_ITEM);
            break;
        case KEY_RIGHT:
            menu_driver(menu, REQ_RIGHT_ITEM);
            break;
        case 10: /* ENTER */
        case 27: /* ESCAPE */
        case ' ':
        case KEY_F(F_BACK):
        case KEY_F(F_EXIT):
            break;
        }
        touchwin(win);
        refresh_all_windows(main_window);

        if (res == 10 || res == ' ') {
            res = item_index(current_item(menu));
            break;
        } else if (res == 27 || res == KEY_F(F_BACK) ||
                res == KEY_F(F_EXIT)) {
            res = KEY_EXIT;
            break;
        }
    }

    unpost_menu(menu);
    free_menu(menu);
    for (i = 0; i < btn_num; i++)
        free_item(btns[i]);

    delwin(win);
    return res;
}

int dialog_inputbox(WINDOW *main_window,
        const char *title, const char *prompt,
        const char *init, char **resultp, int *result_len)
{
    int prompt_lines = 0;
    int prompt_width = 0;
    WINDOW *win;
    WINDOW *prompt_win;
    WINDOW *form_win;
    PANEL *panel;
    int i, x, y;
    int res = -1;
    int cursor_position = strlen(init);
    int cursor_form_win;
    char *result = *resultp;

    if (strlen(init)+1 > *result_len) {
        *result_len = strlen(init)+1;
        *resultp = result = realloc(result, *result_len);
    }

    /* find the widest line of msg: */
    prompt_lines = get_line_no(prompt);
    for (i = 0; i < prompt_lines; i++) {
        const char *line = get_line(prompt, i);
        int len = get_line_length(line);
        prompt_width = max(prompt_width, len);
    }

    if (title)
        prompt_width = max(prompt_width, strlen(title));

    /* place dialog in middle of screen */
    y = (LINES-(prompt_lines+4))/2;
    x = (COLS-(prompt_width+4))/2;

    strncpy(result, init, *result_len);

    /* create the windows */
    win = newwin(prompt_lines+6, prompt_width+7, y, x);
    prompt_win = derwin(win, prompt_lines+1, prompt_width, 2, 2);
    form_win = derwin(win, 1, prompt_width, prompt_lines+3, 2);
    keypad(form_win, TRUE);

    (void) wattrset(form_win, attributes[INPUT_FIELD]);

    (void) wattrset(win, attributes[INPUT_BOX]);
    box(win, 0, 0);
    (void) wattrset(win, attributes[INPUT_HEADING]);
    if (title)
        mvwprintw(win, 0, 3, "%s", title);

    /* print message */
    (void) wattrset(prompt_win, attributes[INPUT_TEXT]);
    fill_window(prompt_win, prompt);

    mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
    cursor_form_win = min(cursor_position, prompt_width-1);
    mvwprintw(form_win, 0, 0, "%s",
          result + cursor_position-cursor_form_win);

    /* create panels */
    panel = new_panel(win);

    /* show the cursor */
    curs_set(1);

    touchwin(win);
    refresh_all_windows(main_window);
    while ((res = wgetch(form_win))) {
        int len = strlen(result);
        switch (res) {
        case 10: /* ENTER */
        case 27: /* ESCAPE */
        case KEY_F(F_HELP):
        case KEY_F(F_EXIT):
        case KEY_F(F_BACK):
            break;
        case 127:
        case KEY_BACKSPACE:
            if (cursor_position > 0) {
                memmove(&result[cursor_position-1],
                        &result[cursor_position],
                        len-cursor_position+1);
                cursor_position--;
                cursor_form_win--;
                len--;
            }
            break;
        case KEY_DC:
            if (cursor_position >= 0 && cursor_position < len) {
                memmove(&result[cursor_position],
                        &result[cursor_position+1],
                        len-cursor_position+1);
                len--;
            }
            break;
        case KEY_UP:
        case KEY_RIGHT:
            if (cursor_position < len) {
                cursor_position++;
                cursor_form_win++;
            }
            break;
        case KEY_DOWN:
        case KEY_LEFT:
            if (cursor_position > 0) {
                cursor_position--;
                cursor_form_win--;
            }
            break;
        case KEY_HOME:
            cursor_position = 0;
            cursor_form_win = 0;
            break;
        case KEY_END:
            cursor_position = len;
            cursor_form_win = min(cursor_position, prompt_width-1);
            break;
        default:
            if ((isgraph(res) || isspace(res))) {
                /* one for new char, one for '\0' */
                if (len+2 > *result_len) {
                    *result_len = len+2;
                    *resultp = result = realloc(result,
                                *result_len);
                }
                /* insert the char at the proper position */
                memmove(&result[cursor_position+1],
                        &result[cursor_position],
                        len-cursor_position+1);
                result[cursor_position] = res;
                cursor_position++;
                cursor_form_win++;
                len++;
            } else {
                mvprintw(0, 0, "unknown key: %d\n", res);
            }
            break;
        }
        if (cursor_form_win < 0)
            cursor_form_win = 0;
        else if (cursor_form_win > prompt_width-1)
            cursor_form_win = prompt_width-1;

        wmove(form_win, 0, 0);
        wclrtoeol(form_win);
        mvwprintw(form_win, 0, 0, "%*s", prompt_width, " ");
        mvwprintw(form_win, 0, 0, "%s",
            result + cursor_position-cursor_form_win);
        wmove(form_win, 0, cursor_form_win);
        touchwin(win);
        refresh_all_windows(main_window);

        if (res == 10) {
            res = 0;
            break;
        } else if (res == 27 || res == KEY_F(F_BACK) ||
                res == KEY_F(F_EXIT)) {
            res = KEY_EXIT;
            break;
        } else if (res == KEY_F(F_HELP)) {
            res = 1;
            break;
        }
    }

    /* hide the cursor */
    curs_set(0);
    del_panel(panel);
    delwin(prompt_win);
    delwin(form_win);
    delwin(win);
    return res;
}

/* refresh all windows in the correct order */
void refresh_all_windows(WINDOW *main_window)
{
    update_panels();
    touchwin(main_window);
    refresh();
}

/* layman's scrollable window... */
void show_scroll_win(WINDOW *main_window,
        const char *title,
        const char *text)
{
    int res;
    int total_lines = get_line_no(text);
    int x, y;
    int start_x = 0, start_y = 0;
    int text_lines = 0, text_cols = 0;
    int total_cols = 0;
    int win_cols = 0;
    int win_lines = 0;
    int i = 0;
    WINDOW *win;
    WINDOW *pad;
    PANEL *panel;

    /* find the widest line of msg: */
    total_lines = get_line_no(text);
    for (i = 0; i < total_lines; i++) {
        const char *line = get_line(text, i);
        int len = get_line_length(line);
        total_cols = max(total_cols, len+2);
    }

    /* create the pad */
    pad = newpad(total_lines+10, total_cols+10);
    (void) wattrset(pad, attributes[SCROLLWIN_TEXT]);
    fill_window(pad, text);

    win_lines = min(total_lines+4, LINES-2);
    win_cols = min(total_cols+2, COLS-2);
    text_lines = max(win_lines-4, 0);
    text_cols = max(win_cols-2, 0);

    /* place window in middle of screen */
    y = (LINES-win_lines)/2;
    x = (COLS-win_cols)/2;

    win = newwin(win_lines, win_cols, y, x);
    keypad(win, TRUE);
    /* show the help in the help window, and show the help panel */
    (void) wattrset(win, attributes[SCROLLWIN_BOX]);
    box(win, 0, 0);
    (void) wattrset(win, attributes[SCROLLWIN_HEADING]);
    mvwprintw(win, 0, 3, " %s ", title);
    panel = new_panel(win);

    /* handle scrolling */
    do {

        copywin(pad, win, start_y, start_x, 2, 2, text_lines,
                text_cols, 0);
        print_in_middle(win,
                text_lines+2,
                0,
                text_cols,
                "<OK>",
                attributes[DIALOG_MENU_FORE]);
        wrefresh(win);

        res = wgetch(win);
        switch (res) {
        case KEY_NPAGE:
        case ' ':
        case 'd':
            start_y += text_lines-2;
            break;
        case KEY_PPAGE:
        case 'u':
            start_y -= text_lines+2;
            break;
        case KEY_HOME:
            start_y = 0;
            break;
        case KEY_END:
            start_y = total_lines-text_lines;
            break;
        case KEY_DOWN:
        case 'j':
            start_y++;
            break;
        case KEY_UP:
        case 'k':
            start_y--;
            break;
        case KEY_LEFT:
        case 'h':
            start_x--;
            break;
        case KEY_RIGHT:
        case 'l':
            start_x++;
            break;
        }
        if (res == 10 || res == 27 || res == 'q' ||
            res == KEY_F(F_HELP) || res == KEY_F(F_BACK) ||
            res == KEY_F(F_EXIT))
            break;
        if (start_y < 0)
            start_y = 0;
        if (start_y >= total_lines-text_lines)
            start_y = total_lines-text_lines;
        if (start_x < 0)
            start_x = 0;
        if (start_x >= total_cols-text_cols)
            start_x = total_cols-text_cols;
    } while (res);

    del_panel(panel);
    delwin(win);
    refresh_all_windows(main_window);
}