XCode Rainbow Print

xcode-rainbow.c

// Prints rainbow-colored text into the Xcode output window.
// Required the XcodeColors plugin:
// https://github.com/robbiehanson/XcodeColors
void XcodeRainbowLog(const char *str)
{
    float hueStep = 1.0 / strlen(str);
    float hue = 0.0;
    for (char *c = str; *c != '\0'; ++c) {
        UIColor *color = [UIColor colorWithHue:hue saturation:1 brightness:0.8 alpha:1];
        hue += hueStep;
        CGFloat r, g, b;
        [color getRed:&r green:&g blue:&b alpha:nil];
        printf("\033[fg%d,%d,%d;%c",
               (int)(r * 256),
               (int)(g * 256),
               (int)(b * 256),
               c);
    }
    printf("\033[fg;"); // reset
}