rbtext/rbtext.c

/*

Copyright 2022 g.uwu@tutanota.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 3 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 <https://www.gnu.org/licenses/>. 

*/

#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

// How many milliseconds the program will wait until the next print ( DEFAULT = 100 )
#define CONF_SLEEP_TIMEMS   (long)100
// How many seconds (in addition to millisecond above) the program will wait ( DEFAULT = 0 )
#define CONF_SLEEP_TIMESEC  (time_t)0
// How many times a color should be shown before switching to the next ( DEFAULT = 2 )
#define CONF_COLOR_LAG 2


// RICERS:
// To add colors, simply add the color (according to the format below) to COLORS
// FORMAT: "R;G;B",
const char *COLORS[] = {
    "193;71;87",    // RED
    "193;116;71",   // ORANGE
    "193;177;71",   // YELLOW
    "149;193;71",   // GREEN
    "71;193;161",   // CYAN
    "71;165;193",   // BLUE
    "155;71;193",   // PURPLE
    "193;71;153",   // PINK
};

unsigned long COLORS_SIZE = sizeof(COLORS) / sizeof(char *);
unsigned long long t = 0;
void genColors(char *s) {
    char *cstr = (char *)malloc(64 + 1);

    for (unsigned long i = 0; i < strlen(s); i++) {
        unsigned long c = ((t + i) / CONF_COLOR_LAG) % COLORS_SIZE;
        snprintf(cstr, 64, "\e[38;2;%sm", COLORS[c]);
        printf("%s%c\e[0m",cstr,s[i]);
    }

    free(cstr);
}

int main(int argc, char **argv) {
    if (argc < 2) {
        // [ERROR] No arguments given. USAGE: ... <text>
        printf("\e[1;31m[ERROR]\e[0m No arguments given.\n\tUSAGE: \e[34m%s \e[33m<text>\e[0m\n",argv[0]);
        return 1;
    }
    
    char *text = (char *)malloc(1024 + 1);

    // Adds all the arguments together with spaces seperating them
    for (int i = 1, j = 0; i < argc; i++) {
        for (unsigned int k = 0; k < strlen(argv[i]); k++, j++)
            text[j] = argv[i][k];
        
        text[j] = ' ';
        j++;
    }        

    struct timespec rem, req = {CONF_SLEEP_TIMESEC, CONF_SLEEP_TIMEMS*1000*1000};
    while (1) {
        printf("\r\e[2K");
        genColors(text);
        fflush(stdout);
        nanosleep(&req, &rem);
        t += 1;
    }

    return 0;
}