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/* Copyright (C) 2020 jaseg <github@jaseg.net>
*
* DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
* Version 2, December 2004
*
* Everyone is permitted to copy and distribute verbatim or modified
* copies of this license document, and changing it is allowed as long
* as the name is changed.
*
* DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
* TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
*
* 0. You just DO WHAT THE FUCK YOU WANT TO.
*/
#define _XOPEN_SOURCE
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include <wchar.h>
#include <time.h>
#include "math.h"
static char helpstr[] = "\n"
"Usage: lolcat [-h horizontal_speed] [-v vertical_speed] [--] [FILES...]\n"
"\n"
"Concatenate FILE(s), or standard input, to standard output.\n"
"With no FILE, or when FILE is -, read standard input.\n"
"\n"
"--horizontal-frequency <d>, -h <d>: Horizontal rainbow frequency (default: 0.23)\n"
" --vertical-frequency <d>, -v <d>: Vertical rainbow frequency (default: 0.1)\n"
" --force-color, -f: Force color even when stdout is not a tty\n"
" --no-force-locale, -l: Use encoding from system locale instead of\n"
" assuming UTF-8\n"
" --random, -r: Random colors\n"
" --24bit, -b: Output in 24-bit \"true\" RGB mode (slower and\n"
" not supported by all terminals)\n"
" --version: Print version and exit\n"
" --help: Show this message\n"
"\n"
"Examples:\n"
" lolcat f - g Output f's contents, then stdin, then g's contents.\n"
" lolcat Copy standard input to standard output.\n"
" fortune | lolcat Display a rainbow cookie.\n"
"\n"
"Report lolcat bugs to <https://github.com/jaseg/lolcat/issues>\n"
"lolcat home page: <https://github.com/jaseg/lolcat/>\n"
"Original idea: <https://github.com/busyloop/lolcat/>\n";
#define ARRAY_SIZE(foo) (sizeof(foo) / sizeof(foo[0]))
const unsigned char codes[] = { 39, 38, 44, 43, 49, 48, 84, 83, 119, 118, 154, 148, 184, 178, 214, 208, 209, 203, 204, 198, 199, 163, 164, 128, 129, 93, 99, 63, 69, 33 };
static void find_escape_sequences(wint_t c, int* state)
{
if (c == '\033') { /* Escape sequence YAY */
*state = 1;
} else if (*state == 1) {
if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
*state = 2;
} else {
*state = 0;
}
}
static void usage(void)
{
wprintf(L"Usage: lolcat [-h horizontal_speed] [-v vertical_speed] [--] [FILES...]\n");
exit(1);
}
static void version(void)
{
wprintf(L"lolcat version 1.1, (c) 2020 jaseg\n");
exit(0);
}
static wint_t helpstr_hack(FILE * _ignored)
{
(void)_ignored;
static size_t idx = 0;
char c = helpstr[idx++];
if (c)
return c;
idx = 0;
return WEOF;
}
int main(int argc, char** argv)
{
char* default_argv[] = { "-" };
int cc = -1, i, l = 0;
wint_t c;
int colors = isatty(STDOUT_FILENO);
int force_locale = 1;
int random = 0;
int rgb = 0;
double freq_h = 0.23, freq_v = 0.1;
struct timeval tv;
gettimeofday(&tv, NULL);
double offx = (tv.tv_sec % 300) / 300.0;
for (i = 1; i < argc; i++) {
char* endptr;
if (!strcmp(argv[i], "-h") || !strcmp(argv[i], "--horizontal-frequency")) {
if ((++i) < argc) {
freq_h = strtod(argv[i], &endptr);
if (*endptr)
usage();
} else {
usage();
}
} else if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "--vertical-frequency")) {
if ((++i) < argc) {
freq_v = strtod(argv[i], &endptr);
if (*endptr)
usage();
} else {
usage();
}
} else if (!strcmp(argv[i], "-f") || !strcmp(argv[i], "--force-color")) {
colors = 1;
} else if (!strcmp(argv[i], "-l") || !strcmp(argv[i], "--no-force-locale")) {
force_locale = 0;
} else if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--random")) {
random = 1;
} else if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--24bit")) {
rgb = 1;
} else if (!strcmp(argv[i], "--version")) {
version();
} else {
if (!strcmp(argv[i], "--"))
i++;
break;
}
}
int rand_offset = 0;
if (random) {
srand(time(NULL));
rand_offset = rand();
}
char** inputs = argv + i;
char** inputs_end = argv + argc;
if (inputs == inputs_end) {
inputs = default_argv;
inputs_end = inputs + 1;
}
char* env_lang = getenv("LANG");
if (force_locale && env_lang && !strstr(env_lang, "UTF-8")) {
if (!setlocale(LC_ALL, "C.UTF-8")) { /* C.UTF-8 may not be available on all platforms */
setlocale(LC_ALL, ""); /* Let's hope for the best */
}
} else {
setlocale(LC_ALL, "");
}
i = 0;
for (char** filename = inputs; filename < inputs_end; filename++) {
wint_t (*this_file_read_wchar)(FILE*); /* Used for --help because fmemopen is universally broken when used with fgetwc */
FILE* f;
int escape_state = 0;
if (!strcmp(*filename, "--help")) {
this_file_read_wchar = &helpstr_hack;
f = 0;
} else if (!strcmp(*filename, "-")) {
this_file_read_wchar = &fgetwc;
f = stdin;
} else {
this_file_read_wchar = &fgetwc;
f = fopen(*filename, "r");
if (!f) {
fwprintf(stderr, L"Cannot open input file \"%s\": %s\n", *filename, strerror(errno));
return 2;
}
}
while ((c = this_file_read_wchar(f)) != WEOF) {
if (colors) {
find_escape_sequences(c, &escape_state);
if (!escape_state) {
if (c == '\n') {
l++;
i = 0;
} else {
if (rgb) {
i += wcwidth(c);
float theta = i * freq_h / 5.0f + l * freq_v + (offx + 2.0f * rand_offset / RAND_MAX) * M_PI;
float offset = 0.1;
uint8_t red = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 0 ))) * 255.0f);
uint8_t green = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 2 * M_PI / 3 ))) * 255.0f);
uint8_t blue = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 4 * M_PI / 3 ))) * 255.0f);
wprintf(L"\033[38;2;%d;%d;%dm", red, green, blue);
} else {
int ncc = offx * ARRAY_SIZE(codes) + (int)((i += wcwidth(c)) * freq_h + l * freq_v);
if (cc != ncc)
wprintf(L"\033[38;5;%hhum", codes[(rand_offset + (cc = ncc)) % ARRAY_SIZE(codes)]);
}
}
}
}
putwchar(c);
if (escape_state == 2) /* implies "colors" */
wprintf(L"\033[38;5;%hhum", codes[(rand_offset + cc) % ARRAY_SIZE(codes)]);
}
if (colors)
wprintf(L"\033[0m");
cc = -1;
if (f) {
if (ferror(f)) {
fwprintf(stderr, L"Error reading input file \"%s\": %s\n", *filename, strerror(errno));
fclose(f);
return 2;
}
if (fclose(f)) {
fwprintf(stderr, L"Error closing input file \"%s\": %s\n", *filename, strerror(errno));
return 2;
}
}
}
}
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