spark.c


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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <float.h>

int main(int argc, char *argv[])
{
	if (argc < 2 || !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
		fprintf(stderr, "Spark\n  by Jason A. Donenfeld <Jason@zx2c4.com>\n\n");
		fprintf(stderr, "Usage: %s [number] [number] [number] ...\n", argv[0]);
		return 1;
	}
	double *values = malloc(sizeof(double) * (argc - 1));
	double max = DBL_MIN;
	double min = DBL_MAX;
	for (int i = 0; i < argc - 1; ++i) {
		values[i] = atof(argv[i + 1]);
		if (values[i] > max)
			max = values[i];
		if (values[i] < min)
			min = values[i];
	}
	double difference = max - min + 1;
	if (difference < 1)
		difference = 1;

	const int levels = 8;
	for (int i = 0; i < argc - 1; ++i) {
		putchar('\xe2');
		putchar('\x96');
		putchar('\x81' + (int)round((values[i] - min + 1) / difference * (levels - 1)));
	}
	putchar('\n');
	
	free(values);
	return 0;
}