feat: add automatic version update checking and notifications

- Add internal/version module for GitHub release checking
- Integrate async version check in Bubble Tea UI
- Display update notification in main interface
- Add version check to --version/-v command output
- Include comprehensive version comparison and error handling
- Add unit tests for version parsing and comparison logic

internal/ui/model.go

@@ -4,6 +4,7 @@ import (
 	"github.com/Gu1llaum-3/sshm/internal/config"
 	"github.com/Gu1llaum-3/sshm/internal/connectivity"
 	"github.com/Gu1llaum-3/sshm/internal/history"
+	"github.com/Gu1llaum-3/sshm/internal/version"
 
 	"github.com/charmbracelet/bubbles/table"
 	"github.com/charmbracelet/bubbles/textinput"
@@ -78,6 +79,10 @@ type Model struct {
 	sortMode       SortMode
 	configFile     string // Path to the SSH config file
 
+	// Version update information
+	updateInfo     *version.UpdateInfo
+	currentVersion string
+
 	// View management
 	viewMode         ViewMode
 	addForm          *addFormModel

internal/ui/table.go

@@ -178,12 +178,13 @@ func (m *Model) updateTableHeight() {
 	// Calculate dynamic table height based on terminal size
 	// Layout breakdown:
 	// - ASCII title: 5 lines (1 empty + 4 text lines)
+	// - Update banner : 1 line (if present)
 	// - Search bar: 1 line
 	// - Help text: 1 line
 	// - App margins/spacing: 3 lines
 	// - Safety margin: 3 lines (to ensure UI elements are always visible)
-	// Total reserved: 13 lines minimum to preserve essential UI elements
-	reservedHeight := 13
+	// Total reserved: 14 lines minimum to preserve essential UI elements
+	reservedHeight := 14
 	availableHeight := m.height - reservedHeight
 	hostCount := len(m.table.Rows())
 

internal/ui/tui.go

@@ -16,7 +16,7 @@ import (
 )
 
 // NewModel creates a new TUI model with the given SSH hosts
-func NewModel(hosts []config.SSHHost, configFile string) Model {
+func NewModel(hosts []config.SSHHost, configFile, currentVersion string) Model {
 	// Initialize the history manager
 	historyManager, err := history.NewHistoryManager()
 	if err != nil {
@@ -38,6 +38,7 @@ func NewModel(hosts []config.SSHHost, configFile string) Model {
 		pingManager:    pingManager,
 		sortMode:       SortByName,
 		configFile:     configFile,
+		currentVersion: currentVersion,
 		styles:         styles,
 		width:          80,
 		height:         24,
@@ -136,8 +137,8 @@ func NewModel(hosts []config.SSHHost, configFile string) Model {
 }
 
 // RunInteractiveMode starts the interactive TUI interface
-func RunInteractiveMode(hosts []config.SSHHost, configFile string) error {
-	m := NewModel(hosts, configFile)
+func RunInteractiveMode(hosts []config.SSHHost, configFile, currentVersion string) error {
+	m := NewModel(hosts, configFile, currentVersion)
 
 	// Start the application in alt screen mode for clean output
 	p := tea.NewProgram(m, tea.WithAltScreen())

internal/ui/update.go

@@ -8,14 +8,17 @@ import (
 
 	"github.com/Gu1llaum-3/sshm/internal/config"
 	"github.com/Gu1llaum-3/sshm/internal/connectivity"
+	"github.com/Gu1llaum-3/sshm/internal/version"
 
 	"github.com/charmbracelet/bubbles/textinput"
 	tea "github.com/charmbracelet/bubbletea"
 )
 
-// Messages for SSH ping functionality
+// Messages for SSH ping functionality and version checking
 type (
-	pingResultMsg *connectivity.HostPingResult
+	pingResultMsg   *connectivity.HostPingResult
+	versionCheckMsg *version.UpdateInfo
+	versionErrorMsg error
 )
 
 // startPingAllCmd creates a command to ping all hosts concurrently
@@ -49,12 +52,33 @@ func pingSingleHostCmd(pingManager *connectivity.PingManager, host config.SSHHos
 	}
 }
 
+// checkVersionCmd creates a command to check for version updates
+func checkVersionCmd(currentVersion string) tea.Cmd {
+	return func() tea.Msg {
+		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+
+		updateInfo, err := version.CheckForUpdates(ctx, currentVersion)
+		if err != nil {
+			return versionErrorMsg(err)
+		}
+		return versionCheckMsg(updateInfo)
+	}
+}
+
 // Init initializes the model
 func (m Model) Init() tea.Cmd {
-	return tea.Batch(
-		textinput.Blink,
-		// Ping is now optional - use 'p' key to start ping
-	)
+	var cmds []tea.Cmd
+
+	// Basic initialization commands
+	cmds = append(cmds, textinput.Blink)
+
+	// Check for version updates if we have a current version
+	if m.currentVersion != "" {
+		cmds = append(cmds, checkVersionCmd(m.currentVersion))
+	}
+
+	return tea.Batch(cmds...)
 }
 
 // Update handles model updates
@@ -115,6 +139,19 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		}
 		return m, nil
 
+	case versionCheckMsg:
+		// Handle version check result
+		if msg != nil {
+			m.updateInfo = msg
+		}
+		return m, nil
+
+	case versionErrorMsg:
+		// Handle version check error (silently - not critical)
+		// We don't want to show error messages for version checks
+		// as it might disrupt the user experience
+		return m, nil
+
 	case addFormSubmitMsg:
 		if msg.err != nil {
 			// Show error in form

internal/ui/view.go

@@ -54,6 +54,20 @@ func (m Model) renderListView() string {
 	// Add the ASCII title
 	components = append(components, m.styles.Header.Render(asciiTitle))
 
+	// Add update notification if available (between title and search)
+	if m.updateInfo != nil && m.updateInfo.Available {
+		updateText := fmt.Sprintf("🚀 Update available: %s → %s",
+			m.updateInfo.CurrentVer,
+			m.updateInfo.LatestVer)
+
+		updateStyle := lipgloss.NewStyle().
+			Foreground(lipgloss.Color("10")). // Green color
+			Bold(true).
+			Align(lipgloss.Center) // Center the notification
+
+		components = append(components, updateStyle.Render(updateText))
+	}
+
 	// Add the search bar with the appropriate style based on focus
 	searchPrompt := "Search (/ to focus): "
 	if m.searchMode {
@@ -157,3 +171,30 @@ func (m Model) renderDeleteConfirmation() string {
 
 	return box.Render(raw)
 }
+
+// renderUpdateNotification renders the update notification banner
+func (m Model) renderUpdateNotification() string {
+	if m.updateInfo == nil || !m.updateInfo.Available {
+		return ""
+	}
+
+	// Create the notification message
+	message := fmt.Sprintf("🚀 Update available: %s → %s",
+		m.updateInfo.CurrentVer,
+		m.updateInfo.LatestVer)
+
+	// Add release URL if available
+	if m.updateInfo.ReleaseURL != "" {
+		message += fmt.Sprintf(" • View release: %s", m.updateInfo.ReleaseURL)
+	}
+
+	// Style the notification with a bright color to make it stand out
+	notificationStyle := lipgloss.NewStyle().
+		Foreground(lipgloss.Color("#00FF00")). // Bright green
+		Bold(true).
+		Padding(0, 1).
+		Border(lipgloss.RoundedBorder()).
+		BorderForeground(lipgloss.Color("#00AA00")) // Darker green border
+
+	return notificationStyle.Render(message)
+}