Create initial elements

Makefile

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+.PHONY: test tidy
+
+tidy:
+	@echo "Tidying up module..."
+	go mod tidy
+
+test:
+	@echo "Running tests..."
+	go test ./...

elem.go

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+package elem
+
+import (
+	"sort"
+)
+
+type Element struct {
+	Tag      string
+	Props    map[string]string
+	Children []interface{} // Can be either string (for text) or another Element
+}
+
+func NewElement(tag string, props Props, children ...interface{}) *Element {
+	return &Element{
+		Tag:      tag,
+		Props:    props,
+		Children: children,
+	}
+}
+
+func (e *Element) Render() string {
+	// Sort the keys for consistent order
+	keys := make([]string, 0, len(e.Props))
+	for k := range e.Props {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	props := ""
+	for _, k := range keys {
+		props += ` ` + k + `="` + e.Props[k] + `"`
+	}
+
+	content := ""
+	for _, child := range e.Children {
+		switch c := child.(type) {
+		case string:
+			content += c
+		case *Element:
+			content += c.Render()
+		}
+	}
+
+	if content == "" {
+		return `<` + e.Tag + props + ` />` // Self-closing tag
+	}
+
+	return `<` + e.Tag + props + `>` + content + `</` + e.Tag + `>`
+}

elements.go

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+package elem
+
+func Div(props Props, children ...interface{}) *Element {
+	return NewElement("div", props, children...)
+}
+
+func H1(props Props, children ...interface{}) *Element {
+	return NewElement("h1", props, children...)
+}
+
+func H2(props Props, children ...interface{}) *Element {
+	return NewElement("h2", props, children...)
+}
+
+func H3(props Props, children ...interface{}) *Element {
+	return NewElement("h3", props, children...)
+}
+
+func P(props Props, children ...interface{}) *Element {
+	return NewElement("p", props, children...)
+}
+
+func A(props Props, children ...interface{}) *Element {
+	return NewElement("a", props, children...)
+}
+
+func Span(props Props, children ...interface{}) *Element {
+	return NewElement("span", props, children...)
+}
+
+func Ul(props Props, children ...interface{}) *Element {
+	return NewElement("ul", props, children...)
+}
+
+func Li(props Props, children ...interface{}) *Element {
+	return NewElement("li", props, children...)
+}
+
+func Img(props Props) *Element {
+	return NewElement("img", props)
+}
+
+func Text(content string) string {
+	return content
+}

elements_test.go

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+package elem
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestA(t *testing.T) {
+	expected := `<a href="https://example.com">Visit Example</a>`
+	el := A(Props{Href: "https://example.com"}, Text("Visit Example"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestDiv(t *testing.T) {
+	expected := `<div class="container">Hello, Elem!</div>`
+	el := Div(Props{Class: "container"}, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestH1(t *testing.T) {
+	expected := `<h1 class="title">Hello, Elem!</h1>`
+	el := H1(Props{Class: "title"}, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestH2(t *testing.T) {
+	expected := `<h2 class="subtitle">Hello, Elem!</h2>`
+	el := H2(Props{Class: "subtitle"}, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestH3(t *testing.T) {
+	expected := `<h3>Hello, Elem!</h3>`
+	el := H3(nil, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestImg(t *testing.T) {
+	expected := `<img alt="An image" src="image.jpg" />`
+	el := Img(Props{Src: "image.jpg", Alt: "An image"})
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestLi(t *testing.T) {
+	expected := `<li>Item 1</li>`
+	el := Li(nil, Text("Item 1"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestP(t *testing.T) {
+	expected := `<p>Hello, Elem!</p>`
+	el := P(nil, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestSpan(t *testing.T) {
+	expected := `<span class="highlight">Hello, Elem!</span>`
+	el := Span(Props{Class: "highlight"}, Text("Hello, Elem!"))
+	assert.Equal(t, expected, el.Render())
+}
+
+func TestUl(t *testing.T) {
+	expected := `<ul><li>Item 1</li><li>Item 2</li></ul>`
+	el := Ul(nil, Li(nil, Text("Item 1")), Li(nil, Text("Item 2")))
+	assert.Equal(t, expected, el.Render())
+}

go.mod

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+module github.com/chasefleming/elem-go
+
+go 1.21.1
+
+require github.com/stretchr/testify v1.8.4
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

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+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=