1 files changed, 37 insertions, 0 deletions
diff --git a/spark.c b/spark.c
new file mode 100644
index 0000000..ea78283
--- /dev/null
+++ b/spark.c
@@ -0,0 +1,37 @@
+#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;
+}