cgit - Web front-end for git that you're looking at right now. Might have had a few additions from upstream.

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*	Add separate header-files for each page/view	Lars Hjemli	2008-03-24
	Yet another step towards removing cgit.h. Signed-off-by: Lars Hjemli <hjemli@gmail.com>

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#include <stdio.h>
#include "pico/stdlib.h"

#include "main_clock.hpp"
#include "../api.hpp"
#include "../buttons.hpp"

namespace app_main_clock {
    bool *ask_user_choice;
    int *user_choice;
    const char *choices[] = {"One", "Two", "Three!", "This is looong!", "make sure to choose me!:p"};
    // Time as string
    // Adapted from pico-sdk/scr/common/pico_util/datetime.c
    void time_as_str(char *buf, uint buf_size, const datetime_t *t) {
        snprintf(buf,
                buf_size,
                "%d:%02d:%02d ",
                t->hour,
                t->min,
                t->sec);
    };
    void date_as_str(char *buf, uint buf_size, const datetime_t *t) {
        static const char *DATETIME_DOWS[7] = {
            "Sun",
            "Mon",
            "Tue",
            "Wed",
            "Thu",
            "Fri",
            "Sat",
        };
        snprintf(buf,
                buf_size,
                "%02d-%02d-%02d %s",
                t->year,
                t->month,
                t->day,
                DATETIME_DOWS[t->dotw]);
    };

    void show_datetime(Api *app_api) {
        char datetime_buf[256];
        char *datetime_str = &datetime_buf[0];
        datetime_t t;
        app_api->datetime_get(&t);

        // time
        time_as_str(datetime_str, sizeof(datetime_buf), &t);
        app_api->display_write_string(0,10,3, datetime_str, FONT_12x16, 0, 1);

        // date
        date_as_str(datetime_str, sizeof(datetime_buf), &t);
        app_api->gui_footer_text((std::string)datetime_str);
    }

    // Rendering of the app
    int render(Api *app_api) {
        app_api->gui_header_text("Test clock", 17);
        show_datetime(app_api);
        if (*ask_user_choice) {
            *user_choice = app_api->gui_popup_strchoice("Ohh!", "Make a good choice:", choices, 5, 0, -1, *user_choice);
            *ask_user_choice = false;
        }
        app_api->gui_footer_text(choices[*user_choice],0,1);
        return 0;
    }

    // Interpretation of button inputs
    int btnpressed(Api *app_api, uint gpio, unsigned long delta) {
        if (gpio == BUTTON_MODE)
            *ask_user_choice = true;
        return 0;
    }

    // Initlisation of the app.
    int init(Api *app_api) {
        app_api->performance_set(Api::perf_modes::LOW_POWER);
        ask_user_choice = new bool; *ask_user_choice = false;
        user_choice = new int; *user_choice = 0;
        if (!(user_choice or ask_user_choice))
            return Api::app_init_return_status::MALLOC_FAILED;
        return Api::app_init_return_status::OK;
    }

    // Processor intensive operations and functions related to drawing to the screen should only be done when the app is in_foreground(=1). This function is only called when the app is init.
    int bgrefresh(Api *app_api, bool in_foreground) {
        return 1;
    }

    // Destruction of app, deinitlisation should be done here. This is only called if the app's APPS_DESTROY_ON_EXIT is set to 1. When it is not a "service" app.
    int destroy(Api *app_api) {
        delete ask_user_choice; ask_user_choice = 0;
        delete user_choice; user_choice = 0;
        return 0;
    }
}