Implementation of creating pill and printing to StdOut.

main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"text/template"
+)
+
+const (
+	baseColour         = "#555"
+	modifier   float64 = 0.2
+	maxValue           = 220
+	blue               = 55
+)
+
+func main() {
+	t := template.New("svgConv")
+
+	percentage := 0.999
+	fill := percentageToRGB(percentage)
+
+	pill := CoveragePill{
+		fmt.Sprintf("%.1f", toFixed(percentage, 3)*100),
+		baseColour,
+		fill,
+	}
+	t, err := t.Parse(svgTemplate)
+	if err != nil {
+		panic(err)
+	}
+
+	_ = t.Execute(os.Stdout, pill)
+}

pill.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"math"
+	"strconv"
+)
+
+const svgTemplate string = `<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="108" height="20" version="1.1">
+    <linearGradient x2="0" y2="100%">
+        <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
+        <stop offset="1" stop-opacity=".1"/>
+    </linearGradient>
+    <mask id="a">
+        <rect width="108" height="20" rx="12" fill="#fff"/>
+    </mask>
+    <g mask="url(#a)">
+        <path d="M0 0h66v20H0z" fill="{{.BaseColour}}"/>
+        <path d="M66 0h44v20H66z" fill="{{.FillColour}}"/>
+    </g>
+    <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
+        <text x="34" y="14" fill="#010101" fill-opacity="0.5">coverage</text>
+        <text x="34" y="13">coverage</text>
+        <text x="87" y="15" fill="#010101" fill-opacity=".5">{{.Percentage}}%</text>
+        <text x="87" y="14">{{.Percentage}}%</text>
+    </g>
+</svg>`
+
+type CoveragePill struct {
+	Percentage string
+	BaseColour string
+	FillColour string
+}
+
+func percentageToRGB(percentage float64) string {
+	red := modifier + clamp(2-2*math.Pow(percentage, 2), 0, 1)*(1-modifier)
+	green := modifier + clamp(2*math.Pow(percentage, 2), 0, 1)*(1-modifier)
+
+	redValue := strconv.Itoa(int(red * maxValue))
+	greenValue := strconv.Itoa(int(green * maxValue))
+	blueValue := strconv.Itoa(blue)
+
+	return "rgb(" + redValue + ", " + greenValue + ", " + blueValue + ")"
+}
+
+func clamp(operation float64, min float64, max float64) float64 {
+	if operation < min {
+		return min
+	}
+	if operation > max {
+		return max
+	}
+	return operation
+}
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func toFixed(num float64, precision int) float64 {
+	output := math.Pow(10, float64(precision))
+	return float64(round(num*output)) / output
+}

test.svg

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+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" width="108" height="20" version="1.1">
+    <linearGradient x2="0" y2="100%">
+        <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
+        <stop offset="1" stop-opacity=".1"/>
+    </linearGradient>
+    <mask id="a">
+        <rect width="108" height="20" rx="12" fill="#fff"/>
+    </mask>
+    <g mask="url(#a)">
+        <path d="M0 0h66v20H0z" fill="#555"/>
+        <path d="M66 0h44v20H66z" fill="rgb(49, 220, 55)"/>
+    </g>
+    <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
+        <text x="34" y="14" fill="#010101" fill-opacity="0.5">coverage</text>
+        <text x="34" y="13">coverage</text>
+        <text x="87" y="15" fill="#010101" fill-opacity=".5">99.9%</text>
+        <text x="87" y="14">99.9%</text>
+    </g>
+</svg>