feat: begin tui implementation

internal/tui/model.go

@@ -0,0 +1,57 @@
+package tui
+
+import (
+	"hosts-go/internal/core"
+
+	list "github.com/charmbracelet/bubbles/list"
+	tea "github.com/charmbracelet/bubbletea"
+)
+
+// entryItem wraps a HostEntry for display in a list component.
+type entryItem struct{ entry *core.HostEntry }
+
+func (e entryItem) Title() string       { return e.entry.Hostname }
+func (e entryItem) Description() string { return e.entry.IP }
+func (e entryItem) FilterValue() string { return e.entry.Hostname }
+
+// Model is the main Bubble Tea model for the application.
+type Model struct {
+	list   list.Model
+	hosts  *core.HostsFile
+	width  int
+	height int
+}
+
+// NewModel constructs the TUI model from a parsed HostsFile.
+func NewModel(hf *core.HostsFile) Model {
+	items := make([]list.Item, len(hf.Entries))
+	for i, e := range hf.Entries {
+		items[i] = entryItem{entry: e}
+	}
+
+	l := list.New(items, list.NewDefaultDelegate(), 0, 0)
+	l.SetShowStatusBar(false)
+	l.SetFilteringEnabled(false)
+	l.SetShowHelp(false)
+	l.SetShowPagination(false)
+
+	return Model{
+		list:  l,
+		hosts: hf,
+	}
+}
+
+// Init satisfies tea.Model.
+func (m Model) Init() tea.Cmd { return nil }
+
+// SelectedEntry returns the currently selected host entry.
+func (m Model) SelectedEntry() *core.HostEntry {
+	if len(m.hosts.Entries) == 0 {
+		return nil
+	}
+	idx := m.list.Index()
+	if idx < 0 || idx >= len(m.hosts.Entries) {
+		return nil
+	}
+	return m.hosts.Entries[idx]
+}