diff options
| -rwxr-xr-x | lolcat.c | 16 |
1 files changed, 13 insertions, 3 deletions
@@ -41,6 +41,7 @@ static char helpstr[] = "\n" " --no-force-locale, -l: Use encoding from system locale instead of\n" " assuming UTF-8\n" " --random, -r: Random colors\n" + " --color_offset <d>, -o <d>: Start with a different color\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" @@ -101,6 +102,7 @@ int main(int argc, char** argv) int colors = isatty(STDOUT_FILENO); int force_locale = 1; int random = 0; + int start_color = 0; int rgb = 0; double freq_h = 0.23, freq_v = 0.1; @@ -132,6 +134,14 @@ int main(int argc, char** argv) force_locale = 0; } else if (!strcmp(argv[i], "-r") || !strcmp(argv[i], "--random")) { random = 1; + } 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], "--version")) { @@ -199,7 +209,7 @@ int main(int argc, char** argv) } 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 theta = i * freq_h / 5.0f + l * freq_v + (offx + 2.0f * (rand_offset + start_color) / 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); @@ -210,7 +220,7 @@ int main(int argc, char** argv) } 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)]); + wprintf(L"\033[38;5;%hhum", codes[(rand_offset + start_color + (cc = ncc)) % ARRAY_SIZE(codes)]); } } } @@ -219,7 +229,7 @@ int main(int argc, char** argv) putwchar(c); if (escape_state == 2) /* implies "colors" */ - wprintf(L"\033[38;5;%hhum", codes[(rand_offset + cc) % ARRAY_SIZE(codes)]); + wprintf(L"\033[38;5;%hhum", codes[(rand_offset + start_color + cc) % ARRAY_SIZE(codes)]); } if (colors) |