feat(tui): message history select with up/down arrows

packages/tui/internal/attachment/attachment.go

@@ -0,0 +1,65 @@
+package attachment
+
+import (
+	"github.com/google/uuid"
+)
+
+type FileSource struct {
+	Path string `toml:"path"`
+	Mime string `toml:"mime"`
+	Data []byte `toml:"data,omitempty"` // Optional for image data
+}
+
+type SymbolSource struct {
+	Path  string      `toml:"path"`
+	Name  string      `toml:"name"`
+	Kind  int         `toml:"kind"`
+	Range SymbolRange `toml:"range"`
+}
+
+type SymbolRange struct {
+	Start Position `toml:"start"`
+	End   Position `toml:"end"`
+}
+
+type Position struct {
+	Line int `toml:"line"`
+	Char int `toml:"char"`
+}
+
+type Attachment struct {
+	ID         string `toml:"id"`
+	Type       string `toml:"type"`
+	Display    string `toml:"display"`
+	URL        string `toml:"url"`
+	Filename   string `toml:"filename"`
+	MediaType  string `toml:"media_type"`
+	StartIndex int    `toml:"start_index"`
+	EndIndex   int    `toml:"end_index"`
+	Source     any    `toml:"source,omitempty"`
+}
+
+// NewAttachment creates a new attachment with a unique ID
+func NewAttachment() *Attachment {
+	return &Attachment{
+		ID: uuid.NewString(),
+	}
+}
+
+// GetFileSource returns the source as FileSource if the attachment is a file type
+func (a *Attachment) GetFileSource() (*FileSource, bool) {
+	if a.Type != "file" {
+		return nil, false
+	}
+	fs, ok := a.Source.(*FileSource)
+	return fs, ok
+}
+
+// GetSymbolSource returns the source as SymbolSource if the attachment is a symbol type
+func (a *Attachment) GetSymbolSource() (*SymbolSource, bool) {
+	if a.Type != "symbol" {
+		return nil, false
+	}
+	ss, ok := a.Source.(*SymbolSource)
+	return ss, ok
+}