103 lines
2 KiB
C
103 lines
2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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enum esc_st {
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ST_NONE = 0,
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ST_ESC_BEGIN,
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ST_ESC_STRING,
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ST_ESC_CSI,
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ST_ESC_STRING_TERM,
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ST_ESC_CSI_TERM,
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ST_ESC_TERM,
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NUM_ST
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};
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static enum esc_st find_escape_sequences(int c, enum esc_st st)
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{
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if (st == ST_NONE || st == ST_ESC_CSI_TERM) {
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if (c == '\033') {
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return ST_ESC_BEGIN;
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} else {
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return ST_NONE;
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}
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} else if (st == ST_ESC_BEGIN) {
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if (c == '[') {
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return ST_ESC_CSI;
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} else if (c == 'P' || c == ']' || c == 'X' || c == '^' || c == '_') {
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return ST_ESC_STRING;
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} else {
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return ST_ESC_TERM;
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}
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} else if (st == ST_ESC_CSI) {
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if (0x40 <= c && c <= 0x7e) {
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return ST_ESC_CSI_TERM;
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} else {
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return st;
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}
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} else if (st == ST_ESC_STRING) {
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if (c == '\007') {
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return ST_NONE;
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} else if (c == '\033') {
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return ST_ESC_STRING_TERM;
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} else {
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return st;
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}
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} else if (st == ST_ESC_STRING_TERM) {
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if (c == '\\') {
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return ST_NONE;
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} else {
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return ST_ESC_STRING;
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}
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} else {
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return ST_NONE;
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}
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}
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int main(int argc, char** argv)
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{
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int i = 0, l = 0;
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int c;
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srand(time(NULL));
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double offx = rand() % 300;
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while ((c = getchar()) != EOF) {
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int escape_state = find_escape_sequences(c, escape_state);
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if (escape_state == ST_ESC_CSI_TERM) {
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putchar(c);
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}
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if (escape_state == ST_NONE || escape_state == ST_ESC_CSI_TERM) {
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if (c == '\n') {
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l++;
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i = 0;
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} else {
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if (escape_state == ST_NONE) {
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i++;
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}
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float theta = i * 0.23 / 5.0f + l * 0.1 + (offx / RAND_MAX) * M_PI;
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float offset = 0.1;
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unsigned char r = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta))) * 255.0f);
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unsigned char g = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 2 * M_PI / 3))) * 255.0f);
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unsigned char b = lrintf((offset + (1.0f - offset) * (0.5f + 0.5f * sin(theta + 4 * M_PI / 3))) * 255.0f);
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printf("\033[38;2;%d;%d;%dm", r, g, b);
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}
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}
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if (escape_state != ST_ESC_CSI_TERM) {
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putchar(c);
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}
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}
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printf("\033[0m");
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return 0;
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}
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