Split up tui code into packages (views/*, shared, util)

pkg/tui/shared/shared.go

@@ -0,0 +1,55 @@
+package shared
+
+import (
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+type Values struct {
+	ConvShortname string
+}
+
+type State struct {
+	Ctx    *lmcli.Context
+	Values *Values
+	Views  *Views
+	Width  int
+	Height int
+	Err    error
+}
+
+// this struct holds the final rendered content of various UI components, and
+// gets populated in the application's Update() method. View() simply composes
+// these elements into the final output
+// TODO: consider removing this, let each view be responsible
+type Views struct {
+	Header  string
+	Content string
+	Error   string
+	Input   string
+	Footer  string
+}
+
+type (
+	// send to change the current state
+	MsgViewChange View
+	// sent to a state when it is entered
+	MsgViewEnter struct{}
+	// sent when an error occurs
+	MsgError error
+)
+
+func WrapError(err error) tea.Cmd {
+	return func() tea.Msg {
+		return MsgError(err)
+	}
+}
+
+type View int
+
+const (
+	StateChat View = iota
+	StateConversations
+	//StateSettings
+	//StateHelp
+)