attempt to add basic syntax highlighting

[CDitzel]

https://github.com/hboetes/mg/blob/32efa2519d61f1402e8c4d6998b1db0a4408e41e/display.c#L330

so I tried to implement a basic syntax highlighting by first trying to color in digits. I tried to utilize ANSI escape codes as follows

	} else if (isprint(c)){
	    if (isdigit(c)){
		char buf[5];
		int clen = snprintf(buf, sizeof(buf), "\x1b[35m");
		for(uint32_t i = 0; i < 5; ++i){
		    vp->v_text[vtcol++] = buf[i];
		} 
		vp->v_text[vtcol++] = c;
		clen = snprintf(buf, sizeof(buf), "\x1b[39m");
		for(uint32_t i = 0; i < 5; ++i){
		    vp->v_text[vtcol++] = buf[i];
		} 
	    }
	    else
		vp->v_text[vtcol++] = c;
	}

but this does not seem to work as it only hides the digits and shrinks the modeline.

Anyone any idea on how to proceed here?