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/* Copyright (C) 2014 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 _GNU_SOURCE //for fmemopen
#include <stdint.h>
#include <stdio.h>
#include <wchar.h>
#include <ctype.h>
#include <error.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <unistd.h>
#include <sys/time.h>
#include "fgetwc_fix.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"
" -h <d>: Horizontal rainbow frequency (default: 0.23)\n"
" -v <d>: Vertical rainbow frequency (default: 0.1)\n"
" -f: Force color even when stdout is not a tty\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 <http://www.github.org/jaseg/lolcat/issues>\n"
"lolcat home page: <http://www.github.org/jaseg/lolcat/>\n"
"Original idea: <http://www.github.org/busyloop/lolcat/>\n";
#define ARRAY_SIZE(foo) (sizeof(foo)/sizeof(foo[0]))
const 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};
/* CAUTION! this function uses a function-static variable! */
void find_escape_sequences(int 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;
}
}
void usage(){
printf("Usage: lolcat [-h horizontal_speed] [-v vertical_speed] [--] [FILES...]\n");
exit(1);
}
void version(){
printf("lolcat version 0.1, (c) 2014 jaseg\n");
exit(0);
}
int main(int argc, char **argv){
int c, cc=-1, i, l=0;
int colors=(isatty(1) == 1);
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")){
if((++i)<argc){
freq_h = strtod(argv[i], &endptr);
if(*endptr)
usage();
}else{
usage();
}
}else if(!strcmp(argv[i], "-v")){
if((++i)<argc){
freq_v = strtod(argv[i], &endptr);
if(*endptr)
usage();
}else{
usage();
}
}else if(!strcmp(argv[i], "-f")){
colors = 1;
}else if(!strcmp(argv[i], "--version")){
version();
}else{
if(!strcmp(argv[i], "--"))
i++;
break;
}
}
char **inputs = argv+i;
char **inputs_end = argv+argc;
if(inputs == inputs_end){
char *foo[] = {"-"};
inputs = foo;
inputs_end = inputs+1;
}
setlocale(LC_ALL, "");
i=0;
for(char **filename=inputs; filename<inputs_end; filename++){
FILE *f = stdin;
int escape_state = 0;
if(!strcmp(*filename, "--help"))
f = fmemopen(helpstr, strlen(helpstr), "r");
else if(strcmp(*filename, "-"))
f = fopen(*filename, "r");
if(!f){
fprintf(stderr, "Cannot open input file \"%s\": %s\n", *filename, strerror(errno));
return 2;
}
while((c = _fgetwc_fixed(f)) > 0){
if(colors){
find_escape_sequences(c, &escape_state);
if(!escape_state){
if(c == '\n'){
l++;
i = 0;
}else if(!iscntrl(c)){
int ncc = offx*ARRAY_SIZE(codes) + (int)((i++)*freq_h + l*freq_v);
if(cc != ncc)
printf("\033[38;5;%hhum", codes[(cc = ncc) % ARRAY_SIZE(codes)]);
}
}
}
printf("%lc", c);
if(escape_state == 2)
printf("\033[38;5;%hhum", codes[cc % ARRAY_SIZE(codes)]);
}
printf("\n\033[0m");
cc = -1;
fclose(f);
if(c != WEOF && c != 0){
fprintf(stderr, "Error reading input file \"%s\": %s\n", *filename, strerror(errno));
return 2;
}
}
}
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