Feat generate status badge

Author: CHIKAMATSU Naohiro

README.md

@@ -30,8 +30,11 @@ Additionally, complex code that increases the complexity of the library, such as
 - [x] text with image
 - [x] plain text
 - [x] details 
+
+Although not in Markdown syntax, there is a method to generate badges; RedBadge(), YellowBadge(), GreenBadge().
 
 ## Example
+### Basic usage
 ```go
 package main
 
@@ -135,10 +138,35 @@ func main() {
 If you want to see how it looks in Markdown, please refer to the following link.
 - [sample.md](./doc/generated_example.md)
 
-## Generate Markdown using `"go generate ./..."`
+### Generate status badge
+The markdown package can create red, yellow, and green status badges.
+[Code example:](./doc/badge/main.go)
+```go
+	md.NewMarkdown(os.Stdout).
+		H1("badge example").
+		RedBadge("red_badge").
+		YellowBadge("yellow_badge").
+		GreenBadge("green_badge").
+		Build()
+```
+
+[Output:](./doc/badge/generated.md)
+````text
+# badge example
+![Badge](https://img.shields.io/badge/red_badge-red)
+![Badge](https://img.shields.io/badge/yellow_badge-yellow)
+![Badge](https://img.shields.io/badge/green_badge-green)
+````
+
+Your badge will look like this;  
+![Badge](https://img.shields.io/badge/red_badge-red)
+![Badge](https://img.shields.io/badge/yellow_badge-yellow)
+![Badge](https://img.shields.io/badge/green_badge-green)
+
+### Generate Markdown using `"go generate ./..."`
 You can generate Markdown using `go generate`. Please define code to generate Markdown first. Then, run `"go generate ./..."` to generate Markdown.
 
-[Code example:](./doc/main.go)
+[Code example:](./doc/generate/main.go)
 ```go
 package main
 
@@ -168,7 +196,7 @@ Run below command:
 go generate ./...
 ```
 
-[Output:](./doc/generated.md)
+[Output:](./doc/generate/generated.md)
 ````text
 # go generate example
 This markdown is generated by `go generate`

badge.go

@@ -0,0 +1,36 @@
+package markdown
+
+import "fmt"
+
+// RedBadge return text with red badge format.
+func (m *Markdown) RedBadge(text string) *Markdown {
+	m.body = append(m.body, fmt.Sprintf("![Badge](https://img.shields.io/badge/%s-red)", text))
+	return m
+}
+
+// RedBadgef return text with red badge format.
+func (m *Markdown) RedBadgef(format string, args ...interface{}) *Markdown {
+	return m.RedBadge(fmt.Sprintf(format, args...))
+}
+
+// YellowBadge return text with yellow badge format.
+func (m *Markdown) YellowBadge(text string) *Markdown {
+	m.body = append(m.body, fmt.Sprintf("![Badge](https://img.shields.io/badge/%s-yellow)", text))
+	return m
+}
+
+// YellowBadgef return text with yellow badge format.
+func (m *Markdown) YellowBadgef(format string, args ...interface{}) *Markdown {
+	return m.YellowBadge(fmt.Sprintf(format, args...))
+}
+
+// GreenBadge return text with green badge format.
+func (m *Markdown) GreenBadge(text string) *Markdown {
+	m.body = append(m.body, fmt.Sprintf("![Badge](https://img.shields.io/badge/%s-green)", text))
+	return m
+}
+
+// GreenBadgef return text with green badge format.
+func (m *Markdown) GreenBadgef(format string, args ...interface{}) *Markdown {
+	return m.GreenBadge(fmt.Sprintf(format, args...))
+}

badge_test.go

@@ -0,0 +1,50 @@
+package markdown
+
+import (
+	"io"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+func TestMarkdown_RedBadgef(t *testing.T) {
+	t.Parallel()
+	t.Run("success RedBadgef()", func(t *testing.T) {
+		t.Parallel()
+
+		m := NewMarkdown(io.Discard)
+		m.RedBadgef("%s", "Hello")
+		want := []string{"![Badge](https://img.shields.io/badge/Hello-red)"}
+		got := m.body
+
+		if diff := cmp.Diff(want, got); diff != "" {
+			t.Errorf("value is mismatch (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("success YellowBadgef()", func(t *testing.T) {
+		t.Parallel()
+
+		m := NewMarkdown(io.Discard)
+		m.YellowBadgef("%s", "Hello")
+		want := []string{"![Badge](https://img.shields.io/badge/Hello-yellow)"}
+		got := m.body
+
+		if diff := cmp.Diff(want, got); diff != "" {
+			t.Errorf("value is mismatch (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("success GreenBadgef()", func(t *testing.T) {
+		t.Parallel()
+
+		m := NewMarkdown(io.Discard)
+		m.GreenBadgef("%s", "Hello")
+		want := []string{"![Badge](https://img.shields.io/badge/Hello-green)"}
+		got := m.body
+
+		if diff := cmp.Diff(want, got); diff != "" {
+			t.Errorf("value is mismatch (-want +got):\n%s", diff)
+		}
+	})
+}

doc/badge/generated.md

@@ -0,0 +1,4 @@
+# badge example
+![Badge](https://img.shields.io/badge/red_badge-red)
+![Badge](https://img.shields.io/badge/yellow_badge-yellow)
+![Badge](https://img.shields.io/badge/green_badge-green)

doc/badge/main.go

@@ -0,0 +1,28 @@
+//go:build linux || darwin
+
+// Package main is generating markdown.
+package main
+
+import (
+	"os"
+
+	md "github.com/go-spectest/markdown"
+)
+
+//go:generate go run main.go
+
+func main() {
+	f, err := os.Create("generated.md")
+	if err != nil {
+		panic(err)
+	}
+
+	if err := md.NewMarkdown(f).
+		H1("badge example").
+		RedBadge("red_badge").
+		YellowBadge("yellow_badge").
+		GreenBadge("green_badge").
+		Build(); err != nil {
+		panic(err)
+	}
+}