Data commit

Task/Sparkline-in-unicode/Go/sparkline-in-unicode.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+    "bufio"
+    "errors"
+    "fmt"
+    "math"
+    "os"
+    "regexp"
+    "strconv"
+    "strings"
+)
+
+func main() {
+    fmt.Println("Numbers please separated by space/commas:")
+    sc := bufio.NewScanner(os.Stdin)
+    sc.Scan()
+    s, n, min, max, err := spark(sc.Text())
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    if n == 1 {
+        fmt.Println("1 value =", min)
+    } else {
+        fmt.Println(n, "values.  Min:", min, "Max:", max)
+    }
+    fmt.Println(s)
+}
+
+var sep = regexp.MustCompile(`[\s,]+`)
+
+func spark(s0 string) (sp string, n int, min, max float64, err error) {
+    ss := sep.Split(s0, -1)
+    n = len(ss)
+    vs := make([]float64, n)
+    var v float64
+    min = math.Inf(1)
+    max = math.Inf(-1)
+    for i, s := range ss {
+        switch v, err = strconv.ParseFloat(s, 64); {
+        case err != nil:
+        case math.IsNaN(v):
+            err = errors.New("NaN not supported.")
+        case math.IsInf(v, 0):
+            err = errors.New("Inf not supported.")
+        default:
+            if v < min {
+                min = v
+            }
+            if v > max {
+                max = v
+            }
+            vs[i] = v
+            continue
+        }
+        return
+    }
+    if min == max {
+        sp = strings.Repeat("▄", n)
+    } else {
+        rs := make([]rune, n)
+        f := 8 / (max - min)
+        for j, v := range vs {
+            i := rune(f * (v - min))
+            if i > 7 {
+                i = 7
+            }
+            rs[j] = '▁' + i
+        }
+        sp = string(rs)
+    }
+    return
+}