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lolcat.c
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lolcat.c
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/* Copyright (C) 2020 jaseg <[email protected]>
*
* 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 <sys/param.h>
#include <unistd.h>
#include <limits.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"
" --seed <d>, -s <d>: Random colors based on given seed,\n"
" implies --random\n"
" --color_offset <d>, -o <d>: Start with a different color\n"
" --gradient <g>, -g <g>: Use color gradient from given start to end color,\n"
" format: -g ff4444:00ffff\n"
" --24bit, -b: Output in 24-bit \"true\" RGB mode (slower and\n"
" not supported by all terminals)\n"
" --16color, -x: Output in 16-color mode for basic terminals\n"
" --invert, -i: Invert foreground and background\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 };
const unsigned char codes16[] = {31, 33, 32, 36, 34, 35, 95, 94, 96, 92, 93, 91};
unsigned int codes_gradient[128];
union rgb_c {
struct {
unsigned char b;
unsigned char g;
unsigned char r;
};
unsigned int i;
};
#include "xterm256lut.h"
int xterm256lookup(union rgb_c *in) {
size_t min_i;
int min_v = INT_MAX;
for (size_t i=0; i<ARRAY_SIZE(xterm256lut); i++) {
int dr = in->r - xterm256lut[i].r;
int dg = in->g - xterm256lut[i].g;
int db = in->b - xterm256lut[i].b;
int d = dr*dr + dg*dg + db*db;
if (d < min_v) {
min_v = d;
min_i = i;
}
}
return 16 + min_i;
}
void rgb_interpolate(union rgb_c *start, union rgb_c *end, union rgb_c *out, double f) {
out->r = start->r + (end->r - start->r)*f;
out->g = start->g + (end->g - start->g)*f;
out->b = start->b + (end->b - start->b)*f;
}
enum esc_st {
ST_NONE=0,
ST_ESC_BEGIN,
ST_ESC_STRING,
ST_ESC_CSI,
ST_ESC_STRING_TERM,
ST_ESC_CSI_TERM,
ST_ESC_TERM,
NUM_ST
};
const char * esc_st_names[NUM_ST] = {
[ST_NONE] = "NONE",
[ST_ESC_BEGIN] = "BEGIN",
[ST_ESC_STRING] = "STRING",
[ST_ESC_CSI] = "CSI",
[ST_ESC_STRING_TERM] = "STRING_TERM",
[ST_ESC_CSI_TERM] = "CSI_TERM",
[ST_ESC_TERM] = "TERM",
};
static enum esc_st find_escape_sequences(wint_t c, enum esc_st st)
{
if (st == ST_NONE || st == ST_ESC_CSI_TERM) {
if (c == '\033') { /* Escape sequence YAY */
return ST_ESC_BEGIN;
} else {
return ST_NONE;
}
} else if (st == ST_ESC_BEGIN) {
if (c == '[') {
return ST_ESC_CSI;
} else if (c == 'P' || c == ']' || c == 'X' || c == '^' || c == '_') {
return ST_ESC_STRING;
} else {
return ST_ESC_TERM;
}
} else if (st == ST_ESC_CSI) {
if (0x40 <= c && c <= 0x7e) {
return ST_ESC_CSI_TERM;
} else {
return st;
}
} else if (st == ST_ESC_STRING) {
if (c == '\007') {
return ST_NONE;
} else if (c == '\033') {
return ST_ESC_STRING_TERM;
} else {
return st;
}
} else if (st == ST_ESC_STRING_TERM) {
if (c == '\\') {
return ST_NONE;
} else {
return ST_ESC_STRING;
}
} else {
return ST_NONE;
}
}
static void usage(void)
{
wprintf(L"Usage: lolcat [-h horizontal_speed] [-v vertical_speed] [--] [FILES...]\n");
wprintf(L"\n");
wprintf(L"Use lolcat --help to print the full help text.\n");
exit(2);
}
static void version(void)
{
wprintf(L"lolcat version 1.5, (c) 2024 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;
unsigned int seed = time(NULL);
int start_color = 0;
int rgb = 0;
int ansi16 = 0;
int invert = 0;
int gradient = 0;
union rgb_c rgb_start, rgb_end;
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], "-S") || !strcmp(argv[i], "--seed")) {
random = 1;
if ((++i) < argc) {
seed = strtoul(argv[i], &endptr, 10);
if (*endptr)
usage();
} else {
usage();
}
} else if (!strcmp(argv[i], "-o") || !strcmp(argv[i], "--color_offset")) {
if ((++i) < argc) {
start_color = strtod(argv[i], &endptr);
if (*endptr)
usage();
} else {
usage();
}
} else if (!strcmp(argv[i], "-b") || !strcmp(argv[i], "--24bit")) {
rgb = 1;
} else if (!strcmp(argv[i], "-x") || !strcmp(argv[i], "--16color")) {
ansi16 = 1;
} else if (!strcmp(argv[i], "-i") || !strcmp(argv[i], "--invert")) {
invert = 1;
} else if (!strcmp(argv[i], "-g") || !strcmp(argv[i], "--gradient")) {
if ((++i) >= argc) {
usage();
}
if (strlen(argv[i]) != 6+1+6 || argv[i][6] != ':') {
wprintf(L"Invalid format for --gradient\n");
usage();
}
argv[i][6] = '\0';
rgb_start.i = strtoul(argv[i], &endptr, 16);
if (*endptr) {
wprintf(L"Invalid format for --gradient\n");
usage();
}
rgb_end.i = strtoul(argv[i]+6+1, &endptr, 16);
if (*endptr) {
wprintf(L"Invalid format for --gradient\n");
usage();
}
gradient = 1;
} else if (!strcmp(argv[i], "--version")) {
version();
} else {
if (!strcmp(argv[i], "--"))
i++;
break;
}
}
if (rgb && ansi16) {
wprintf(L"Only one of --24bit and --16color can be given at a time\n");
usage();
}
if (gradient) {
if (ansi16) {
wprintf(L"--gradient and --16color are mutually exclusive\n");
usage();
}
if (!rgb) {
double correction_factor =(2*ARRAY_SIZE(codes_gradient)) / (double)ARRAY_SIZE(codes);
freq_h *= correction_factor;
freq_v *= correction_factor;
for (size_t i=0; i<ARRAY_SIZE(codes_gradient); i++) {
double f = i / (double)(ARRAY_SIZE(codes_gradient) - 1);
union rgb_c rgb_intermediate;
rgb_interpolate(&rgb_start, &rgb_end, &rgb_intermediate, f);
codes_gradient[i] = xterm256lookup(&rgb_intermediate);
}
}
}
if (invert) {
if (ansi16) {
wprintf(L"\033[30m\n");
} else {
wprintf(L"\033[38;5;16m\n");
}
}
int rand_offset = 0;
if (random) {
srand(seed);
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 = ST_NONE;
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) {
escape_state = find_escape_sequences(c, escape_state);
#ifdef ESC_DEBUG
fprintf(stderr, "%02x %c %s\n", c, c > 32 ? c : '.', esc_st_names[escape_state]);
#endif
if (escape_state == ST_ESC_CSI_TERM) {
putwchar(c);
}
if (escape_state == ST_NONE || escape_state == ST_ESC_CSI_TERM) {
if (c == '\n') {
l++;
i = 0;
cc = -1;
if (invert) {
wprintf(L"\033[49m");
} else {
wprintf(L"\033[0m");
}
} else {
if (escape_state == ST_NONE) {
i += wcwidth(c);
}
if (rgb) {
float theta = i * freq_h / 5.0f + l * freq_v + (offx + 2.0f * (rand_offset + start_color) / RAND_MAX)*M_PI;
union rgb_c c;
if (gradient) {
theta = fmodf(theta/2.0/M_PI, 2.0f);
if (theta > 1.0f) {
theta = 2.0f - theta;
}
rgb_interpolate(&rgb_start, &rgb_end, &c, theta);
} else {
float offset = 0.1;
c.r = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 0 ))) * 255.0f);
c.g = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 2 * M_PI / 3 ))) * 255.0f);
c.b = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 4 * M_PI / 3 ))) * 255.0f);
}
wprintf(L"\033[%d;2;%d;%d;%dm", (invert ? 48 : 38), c.r, c.g, c.b);
} else if (ansi16) {
int ncc = offx * ARRAY_SIZE(codes16) + (int)(i * freq_h + l * freq_v);
if (cc != ncc || escape_state == ST_ESC_CSI_TERM) {
wprintf(L"\033[%hhum", (invert ? 10 : 0) + codes16[(rand_offset + start_color + (cc = ncc)) % ARRAY_SIZE(codes16)]);
}
} else {
if (gradient) {
int ncc = offx * ARRAY_SIZE(codes_gradient) + (int)(i * freq_h + l * freq_v);
if (cc != ncc || escape_state == ST_ESC_CSI_TERM) {
size_t lookup = (rand_offset + start_color + (cc = ncc)) % (2*ARRAY_SIZE(codes_gradient));
if (lookup >= ARRAY_SIZE(codes_gradient)) {
lookup = 2*ARRAY_SIZE(codes_gradient) - 1 - lookup;
}
wprintf(L"\033[%d;5;%hhum", (invert ? 48 : 38), codes_gradient[lookup]);
}
} else {
int ncc = offx * ARRAY_SIZE(codes) + (int)(i * freq_h + l * freq_v);
if (cc != ncc || escape_state == ST_ESC_CSI_TERM) {
wprintf(L"\033[%d;5;%hhum", (invert ? 48 : 38), codes[(rand_offset + start_color + (cc = ncc)) % ARRAY_SIZE(codes)]);
}
}
}
}
}
}
if (escape_state != ST_ESC_CSI_TERM) {
putwchar(c);
}
}
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;
}
}
}
}