Add hot reload for development

Implement automatic rebuild and browser reload during development: - File watcher monitors .go files for changes with configurable extensions - Builder compiles Go source to WASM on file changes - LiveReload WebSocket server notifies connected browsers to reload - DevServer combines all components for easy development setup - HTML injection adds reload script automatically Usage: dev := host.NewDevServer("public", "index.html", ".", "public/app.wasm") dev.ListenAndServe(":8080") Closes #9 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-09 17:03:28 +01:00
parent 9642fd008e
commit 89efc9b41d
9 changed files with 1244 additions and 15 deletions
--- a/host/inject_test.go
+++ b/host/inject_test.go
@@ -0,0 +1,102 @@
+package host
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestInjectReloadScript_BeforeBody(t *testing.T) {
+	html := []byte(`<!DOCTYPE html>
+<html>
+<head><title>Test</title></head>
+<body>
+<h1>Hello</h1>
+</body>
+</html>`)
+
+	result := InjectReloadScript(html)
+
+	// Should contain the script
+	if !strings.Contains(string(result), "livereload") {
+		t.Error("Expected result to contain livereload script")
+	}
+
+	// Script should be before </body>
+	bodyIndex := strings.Index(string(result), "</body>")
+	scriptIndex := strings.Index(string(result), "<script>")
+
+	if scriptIndex > bodyIndex {
+		t.Error("Expected script to be injected before </body>")
+	}
+}
+
+func TestInjectReloadScript_BeforeHTML(t *testing.T) {
+	// HTML without body tag
+	html := []byte(`<!DOCTYPE html>
+<html>
+<head><title>Test</title></head>
+<div>Hello</div>
+</html>`)
+
+	result := InjectReloadScript(html)
+
+	// Should contain the script
+	if !strings.Contains(string(result), "livereload") {
+		t.Error("Expected result to contain livereload script")
+	}
+
+	// Script should be before </html>
+	htmlIndex := strings.Index(string(result), "</html>")
+	scriptIndex := strings.Index(string(result), "<script>")
+
+	if scriptIndex > htmlIndex {
+		t.Error("Expected script to be injected before </html>")
+	}
+}
+
+func TestInjectReloadScript_Fallback(t *testing.T) {
+	// Minimal HTML without body or html closing tags
+	html := []byte(`<div>Hello</div>`)
+
+	result := InjectReloadScript(html)
+
+	// Should contain the script
+	if !strings.Contains(string(result), "livereload") {
+		t.Error("Expected result to contain livereload script")
+	}
+
+	// Should be appended at the end
+	if !strings.HasSuffix(string(result), "</script>") {
+		t.Error("Expected script to be appended at the end")
+	}
+}
+
+func TestInjectReloadScript_ContainsReconnect(t *testing.T) {
+	html := []byte(`<html><body></body></html>`)
+	result := InjectReloadScript(html)
+
+	// Should contain reconnection logic
+	if !strings.Contains(string(result), "reconnect") {
+		t.Error("Expected script to contain reconnection logic")
+	}
+}
+
+func TestIsHTMLContent(t *testing.T) {
+	tests := []struct {
+		contentType string
+		expected    bool
+	}{
+		{"text/html", true},
+		{"text/html; charset=utf-8", true},
+		{"application/json", false},
+		{"text/css", false},
+		{"application/javascript", false},
+	}
+
+	for _, tt := range tests {
+		result := IsHTMLContent(tt.contentType)
+		if result != tt.expected {
+			t.Errorf("IsHTMLContent(%q) = %v, want %v", tt.contentType, result, tt.expected)
+		}
+	}
+}