smallclock.d

/*
a one char clock for 256 color teminals

red-yellow: am
teal-blue: pm
☀: noon
☾: midnight
red/teal: early hour
yellow/blue: late hour

accepts command line arguments such as "15 30"
*/
import std;
char[] magiccolorstring(int i,bool whitetext){
	char[] o="\033[48;5;999m\033[30m".dup;
	enum offset="\033[48;5;".length;
	o[offset+2]=((i/1  )%10)+'0';
	o[offset+1]=((i/10 )%10)+'0';
	o[offset+0]=((i/100)%10)+'0';
	enum offset2="\033[48;5;999m\033[3".length;
	if(whitetext){
		o[offset2]='7';
	}
	return o;
}
enum string resetcolor="\033[0m";
void colorprint(string s,int color,bool whitetext){
	magiccolorstring(color,whitetext).write;
	s.write;
	resetcolor.write;
}
unittest{
	colorprint("hello",21,true);
	colorprint("hello",51,false);
}
alias now=Clock.currTime;
string[13] glyph=["1","2","3","4","5","6","7","8","9","X","ꔔ","☾","︎☀"];
int toglyph(int i){
	switch(i){
		case 0:return 11;
		case 12:return 12;
		default: return i%12-1;
}}

unittest{
	writeln(now.hour.to!int,":",now.minute);
	glyph[now.hour.toglyph].writeln;
}
//note d 2d arrays are backwards
int[6][2] colors=[
	[51,45,39,33,27,21],//pm
	[196,202,208,214,220,226]
];
bool isnight(int hour)=>(hour<13)^(hour%12==0);
void main(string[] args){
	int min;
	int hour;
	if(args.length<3){
		min=now.minute;
		hour=now.hour;
	} else {
		hour=args[1].to!int;
		min=args[2].to!int;
	}
	min/=10;
	assert(min<6);
	assert(hour<24);
	glyph[hour.toglyph].//hour glyph
		colorprint(colors[hour.isnight][min],//colorscheme
		!(min<3)^(hour.isnight));//whitetext
}