util.c

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// SPDX-License-Identifier: GPL-2.0
#include "../../util/util.h"
#include <signal.h>
#include <stdbool.h>
#include <string.h>
#include <sys/ttydefaults.h>

#include "../../util/cache.h"
#include "../../util/debug.h"
#include "../browser.h"
#include "../keysyms.h"
#include "../helpline.h"
#include "../ui.h"
#include "../util.h"
#include "../libslang.h"

static void ui_browser__argv_write(struct ui_browser *browser,
                   void *entry, int row)
{
    char **arg = entry;
    bool current_entry = ui_browser__is_current_entry(browser, row);

    ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
                               HE_COLORSET_NORMAL);
    ui_browser__write_nstring(browser, *arg, browser->width);
}

static int popup_menu__run(struct ui_browser *menu)
{
    int key;

    if (ui_browser__show(menu, " ", "ESC: exit, ENTER|->: Select option") < 0)
        return -1;

    while (1) {
        key = ui_browser__run(menu, 0);

        switch (key) {
        case K_RIGHT:
        case K_ENTER:
            key = menu->index;
            break;
        case K_LEFT:
        case K_ESC:
        case 'q':
        case CTRL('c'):
            key = -1;
            break;
        default:
            continue;
        }

        break;
    }

    ui_browser__hide(menu);
    return key;
}

int ui__popup_menu(int argc, char * const argv[])
{
    struct ui_browser menu = {
        .entries    = (void *)argv,
        .refresh    = ui_browser__argv_refresh,
        .seek       = ui_browser__argv_seek,
        .write      = ui_browser__argv_write,
        .nr_entries = argc,
    };

    return popup_menu__run(&menu);
}

int ui_browser__input_window(const char *title, const char *text, char *input,
                 const char *exit_msg, int delay_secs)
{
    int x, y, len, key;
    int max_len = 60, nr_lines = 0;
    static char buf[50];
    const char *t;

    t = text;
    while (1) {
        const char *sep = strchr(t, '\n');

        if (sep == NULL)
            sep = strchr(t, '\0');
        len = sep - t;
        if (max_len < len)
            max_len = len;
        ++nr_lines;
        if (*sep == '\0')
            break;
        t = sep + 1;
    }

    pthread_mutex_lock(&ui__lock);

    max_len += 2;
    nr_lines += 8;
    y = SLtt_Screen_Rows / 2 - nr_lines / 2;
    x = SLtt_Screen_Cols / 2 - max_len / 2;

    SLsmg_set_color(0);
    SLsmg_draw_box(y, x++, nr_lines, max_len);
    if (title) {
        SLsmg_gotorc(y, x + 1);
        SLsmg_write_string((char *)title);
    }
    SLsmg_gotorc(++y, x);
    nr_lines -= 7;
    max_len -= 2;
    SLsmg_write_wrapped_string((unsigned char *)text, y, x,
                   nr_lines, max_len, 1);
    y += nr_lines;
    len = 5;
    while (len--) {
        SLsmg_gotorc(y + len - 1, x);
        SLsmg_write_nstring((char *)" ", max_len);
    }
    SLsmg_draw_box(y++, x + 1, 3, max_len - 2);

    SLsmg_gotorc(y + 3, x);
    SLsmg_write_nstring((char *)exit_msg, max_len);
    SLsmg_refresh();

    pthread_mutex_unlock(&ui__lock);

    x += 2;
    len = 0;
    key = ui__getch(delay_secs);
    while (key != K_TIMER && key != K_ENTER && key != K_ESC) {
        pthread_mutex_lock(&ui__lock);

        if (key == K_BKSPC) {
            if (len == 0) {
                pthread_mutex_unlock(&ui__lock);
                goto next_key;
            }
            SLsmg_gotorc(y, x + --len);
            SLsmg_write_char(' ');
        } else {
            buf[len] = key;
            SLsmg_gotorc(y, x + len++);
            SLsmg_write_char(key);
        }
        SLsmg_refresh();

        pthread_mutex_unlock(&ui__lock);

        /* XXX more graceful overflow handling needed */
        if (len == sizeof(buf) - 1) {
            ui_helpline__push("maximum size of symbol name reached!");
            key = K_ENTER;
            break;
        }
next_key:
        key = ui__getch(delay_secs);
    }

    buf[len] = '\0';
    strncpy(input, buf, len+1);
    return key;
}

int ui__question_window(const char *title, const char *text,
            const char *exit_msg, int delay_secs)
{
    int x, y;
    int max_len = 0, nr_lines = 0;
    const char *t;

    t = text;
    while (1) {
        const char *sep = strchr(t, '\n');
        int len;

        if (sep == NULL)
            sep = strchr(t, '\0');
        len = sep - t;
        if (max_len < len)
            max_len = len;
        ++nr_lines;
        if (*sep == '\0')
            break;
        t = sep + 1;
    }

    pthread_mutex_lock(&ui__lock);

    max_len += 2;
    nr_lines += 4;
    y = SLtt_Screen_Rows / 2 - nr_lines / 2,
    x = SLtt_Screen_Cols / 2 - max_len / 2;

    SLsmg_set_color(0);
    SLsmg_draw_box(y, x++, nr_lines, max_len);
    if (title) {
        SLsmg_gotorc(y, x + 1);
        SLsmg_write_string((char *)title);
    }
    SLsmg_gotorc(++y, x);
    nr_lines -= 2;
    max_len -= 2;
    SLsmg_write_wrapped_string((unsigned char *)text, y, x,
                   nr_lines, max_len, 1);
    SLsmg_gotorc(y + nr_lines - 2, x);
    SLsmg_write_nstring((char *)" ", max_len);
    SLsmg_gotorc(y + nr_lines - 1, x);
    SLsmg_write_nstring((char *)exit_msg, max_len);
    SLsmg_refresh();

    pthread_mutex_unlock(&ui__lock);

    return ui__getch(delay_secs);
}

int ui__help_window(const char *text)
{
    return ui__question_window("Help", text, "Press any key...", 0);
}

int ui__dialog_yesno(const char *msg)
{
    return ui__question_window(NULL, msg, "Enter: Yes, ESC: No", 0);
}

static int __ui__warning(const char *title, const char *format, va_list args)
{
    char *s;

    if (vasprintf(&s, format, args) > 0) {
        int key;

        key = ui__question_window(title, s, "Press any key...", 0);
        free(s);
        return key;
    }

    fprintf(stderr, "%s\n", title);
    vfprintf(stderr, format, args);
    return K_ESC;
}

static int perf_tui__error(const char *format, va_list args)
{
    return __ui__warning("Error:", format, args);
}

static int perf_tui__warning(const char *format, va_list args)
{
    return __ui__warning("Warning:", format, args);
}

struct perf_error_ops perf_tui_eops = {
    .error      = perf_tui__error,
    .warning    = perf_tui__warning,
};