init tiramisu

tiramisu.go

@@ -0,0 +1,111 @@
+package tiramisu
+
+import (
+	"embed"
+	"fmt"
+
+	wv "github.com/webview/webview_go"
+)
+
+type TiramisuOptions struct {
+	Debug  bool
+	Width  int
+	Height int
+	Title  string
+	Hints  wv.Hint
+}
+
+type FuncHandler func(args ...any) (any, error)
+
+type Tiramisu struct {
+	w     wv.WebView
+	funcs map[string]FuncHandler
+}
+
+func New(o TiramisuOptions) *Tiramisu {
+	w := wv.New(o.Debug)
+	t := &Tiramisu{
+		w:     w,
+		funcs: make(map[string]FuncHandler),
+	}
+
+	w.SetSize(o.Width, o.Height, o.Hints)
+	w.SetTitle(o.Title)
+
+	return t
+}
+
+func (t *Tiramisu) Run(fn func()) {
+	defer t.w.Destroy()
+	t.w.Dispatch(func() {
+		t.injectJS()
+
+		if fn != nil {
+			fn()
+		}
+	})
+	t.w.Run()
+}
+
+func (t *Tiramisu) bind(name string, fn FuncHandler) {
+	t.w.Bind(name, fn)
+}
+
+func (t *Tiramisu) Bind(name string, fn FuncHandler) {
+	if _, exists := t.funcs[name]; exists {
+		panic(fmt.Sprintf("function %s is already bound", name))
+	}
+
+	t.funcs[name] = fn
+	t.bind(name, func(args ...any) (any, error) {
+		return t.invoke(name, args...)
+	})
+}
+
+func (t *Tiramisu) invoke(name string, args ...any) (any, error) {
+	fn, ok := t.funcs[name]
+	if !ok {
+		return nil, fmt.Errorf("function %s not found", name)
+	}
+	result, err := fn(args...)
+	if err != nil {
+		return nil, fmt.Errorf("error invoking function %s: %w", name, err)
+	}
+	return result, nil
+}
+
+func (t *Tiramisu) Eval(js string) {
+	t.w.Eval(js)
+}
+
+func (t *Tiramisu) Evalf(js string, args ...any) {
+	fmt := fmt.Sprintf(js, args...)
+	t.w.Eval(fmt)
+}
+
+func (t *Tiramisu) HTML(html string) {
+	t.w.SetHtml(html)
+	t.injectJS()
+}
+
+//go:embed runtime/out/*
+var runtimeFS embed.FS
+
+func (t *Tiramisu) injectJS() {
+	js, err := runtimeFS.ReadFile("runtime/out/preload.js")
+	if err != nil {
+		panic(fmt.Sprintf("failed to read preload.js: %v", err))
+	}
+
+	t.w.Eval(string(js))
+	t.bind("invoke", func(args ...any) (any, error) {
+		name, ok := args[0].(string)
+		if !ok {
+			return nil, fmt.Errorf("first argument must be a string, got %T", args[0])
+		}
+		if len(args) == 1 {
+			return t.invoke(name)
+		}
+		return t.invoke(name, args[1:]...)
+	})
+}