feat(ui): show active ssh sessions

README.md

@@ -38,6 +38,7 @@ It lets you browse, search, connect to, edit, and organize the hosts defined in
 ### Fast Navigation
 - Fuzzy search by alias, IP, user, or tag
 - Press `Enter` to connect to the selected host immediately
+- See currently running local SSH sessions in a read-only panel
 - Organize hosts with tags such as `prod`, `dev`, and `test`
 - Sort by alias or last connection time, with reversible order
 

README.zh-CN.md

@@ -38,6 +38,7 @@ lazyssh 是一个运行在终端中的交互式 SSH 管理器，灵感来自 `la
 ### 快速导航
 - 支持按别名、IP、用户或标签进行模糊搜索
 - 选中主机后按回车即可直接 SSH 登录
+- 只读展示当前本机正在运行的 SSH 会话
 - 支持用标签组织主机，例如 `prod`、`dev`、`test`
 - 支持按别名或最近连接时间排序，并可反转排序方向
 

cmd/main.go

@@ -77,7 +77,7 @@ func main() {
 			}
 
 			metaDataFile := filepath.Join(home, ".lazyssh", "metadata.json")
-			var serverRepo = ssh_config_file.NewRepositoryWithWritePath(log, configPath, managedConfigPath, metaDataFile)
+			serverRepo := ssh_config_file.NewRepositoryWithWritePath(log, configPath, managedConfigPath, metaDataFile)
 			if sshConfigReadOnly {
 				serverRepo = ssh_config_file.NewReadOnlyRepository(log, configPath, metaDataFile)
 			}

internal/adapters/ui/active_sessions.go

@@ -0,0 +1,83 @@
+// Copyright 2025.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/rivo/tview"
+	"github.com/urzeye/lazyssh/internal/core/domain"
+)
+
+const maxActiveSessionsShown = 4
+
+type ActiveSessions struct {
+	*tview.TextView
+}
+
+func NewActiveSessions() *ActiveSessions {
+	sessions := &ActiveSessions{
+		TextView: tview.NewTextView(),
+	}
+	sessions.build()
+	return sessions
+}
+
+func (as *ActiveSessions) build() {
+	as.TextView.SetDynamicColors(true).
+		SetWrap(false).
+		SetScrollable(false).
+		SetBorder(true).
+		SetTitle(" Active Sessions ").
+		SetTitleAlign(tview.AlignCenter).
+		SetBorderColor(CurrentTheme.Border).
+		SetTitleColor(CurrentTheme.Title)
+	as.SetSessions(nil)
+}
+
+func (as *ActiveSessions) SetSessions(sessions []domain.ActiveSession) {
+	as.SetTitle(fmt.Sprintf(" Active Sessions: %d ", len(sessions)))
+	if len(sessions) == 0 {
+		as.SetText(colorText(CurrentTheme.DimText, "No active SSH sessions"))
+		return
+	}
+
+	lines := make([]string, 0, min(len(sessions), maxActiveSessionsShown)+1)
+	for index, session := range sessions {
+		if index >= maxActiveSessionsShown {
+			lines = append(lines, colorText(CurrentTheme.DimText, fmt.Sprintf("+%d more", len(sessions)-index)))
+			break
+		}
+		lines = append(lines, formatActiveSessionLine(session))
+	}
+	as.SetText(strings.Join(lines, "\n"))
+}
+
+func formatActiveSessionLine(session domain.ActiveSession) string {
+	alias := session.Alias
+	if alias == "" {
+		alias = session.Destination
+	}
+
+	parts := []string{
+		colorText(CurrentTheme.MetaText, fmt.Sprintf("%d", session.PID)),
+		colorText(CurrentTheme.AliasText, tview.Escape(alias)),
+	}
+	if len(session.Forwards) > 0 {
+		parts = append(parts, colorText(CurrentTheme.HostText, strings.Join(session.Forwards, ", ")))
+	}
+	return strings.Join(parts, "  ")
+}

internal/adapters/ui/active_sessions_test.go

@@ -0,0 +1,53 @@
+// Copyright 2025.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ui
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/urzeye/lazyssh/internal/core/domain"
+)
+
+func TestActiveSessionsSetSessionsShowsCountAndLimit(t *testing.T) {
+	view := NewActiveSessions()
+	view.SetSessions([]domain.ActiveSession{
+		{PID: 1, Alias: "alpha"},
+		{PID: 2, Alias: "beta"},
+		{PID: 3, Alias: "gamma"},
+		{PID: 4, Alias: "delta"},
+		{PID: 5, Alias: "epsilon"},
+	})
+
+	if got := view.GetTitle(); got != " Active Sessions: 5 " {
+		t.Fatalf("title = %q, want count title", got)
+	}
+	text := view.GetText(false)
+	if !strings.Contains(text, "alpha") || !strings.Contains(text, "+1 more") {
+		t.Fatalf("text = %q, want first session and overflow indicator", text)
+	}
+	if strings.Contains(text, "epsilon") {
+		t.Fatalf("text = %q, should not include hidden overflow session", text)
+	}
+}
+
+func TestActiveSessionsSetSessionsShowsEmptyState(t *testing.T) {
+	view := NewActiveSessions()
+	view.SetSessions(nil)
+
+	if text := view.GetText(false); !strings.Contains(text, "No active SSH sessions") {
+		t.Fatalf("text = %q, want empty state", text)
+	}
+}

internal/adapters/ui/handlers.go

@@ -408,19 +408,27 @@ func (t *tui) handleRefreshBackground() {
 			})
 			return
 		}
+		sessions, sessionsErr := t.serverService.ListActiveSessions()
 		if strings.TrimSpace(q) == "" {
 			sortServersForUI(servers, t.sortMode)
 		}
 		t.app.QueueUpdateDraw(func() {
 			t.serverList.UpdateServers(servers)
+			if sessionsErr == nil && t.sessions != nil {
+				t.sessions.SetSessions(sessions)
+			}
 			// Try to restore selection if still valid
 			if prevIdx >= 0 && prevIdx < t.serverList.List.GetItemCount() {
 				t.serverList.SetCurrentItem(prevIdx)
 				if srv, ok := t.serverList.GetSelectedServer(); ok {
 					t.details.UpdateServer(srv)
 				}
 			}
-			t.showStatusTemp(fmt.Sprintf("Refreshed %d servers", len(servers)))
+			if sessionsErr != nil {
+				t.showStatusTempColor(fmt.Sprintf("Refreshed %d servers; active sessions failed", len(servers)), CurrentTheme.Warning)
+				return
+			}
+			t.showStatusTemp(fmt.Sprintf("Refreshed %d servers, %d active sessions", len(servers), len(sessions)))
 		})
 	}(currentIdx, query)
 }
@@ -648,6 +656,9 @@ func (t *tui) showSearchBar() {
 	t.left.Clear()
 	t.left.AddItem(t.searchBar, 3, 0, true)
 	t.left.AddItem(t.serverList, 0, 1, false)
+	if t.sessions != nil {
+		t.left.AddItem(t.sessions, 6, 0, false)
+	}
 	t.searchVisible = true
 	if t.app != nil {
 		t.app.SetFocus(t.searchBar)
@@ -666,6 +677,9 @@ func (t *tui) hideSearchBar() {
 	t.left.Clear()
 	t.left.AddItem(t.hintBar, 1, 0, false)
 	t.left.AddItem(t.serverList, 0, 1, true)
+	if t.sessions != nil {
+		t.left.AddItem(t.sessions, 6, 0, false)
+	}
 	t.searchVisible = false
 	if t.app != nil {
 		t.app.SetFocus(t.serverList)
@@ -686,6 +700,7 @@ func (t *tui) refreshServerList() {
 		sortServersForUI(filtered, t.sortMode)
 	}
 	t.serverList.UpdateServers(filtered)
+	t.loadActiveSessions()
 }
 
 func (t *tui) returnToMain() {

internal/adapters/ui/tui.go

@@ -41,6 +41,7 @@ type tui struct {
 	hintBar    *tview.TextView
 	searchBar  *SearchBar
 	serverList *ServerList
+	sessions   *ActiveSessions
 	details    *ServerDetails
 	statusBar  *tview.TextView
 
@@ -123,6 +124,7 @@ func (t *tui) buildComponents() *tui {
 	t.serverList = NewServerList().
 		OnSelectionChange(t.handleServerSelectionChange).
 		OnReturnToSearch(t.handleReturnToSearch)
+	t.sessions = NewActiveSessions()
 	t.details = NewServerDetails()
 	t.statusBar = NewStatusBar()
 
@@ -153,7 +155,8 @@ func (t *tui) loadPreferences() *tui {
 func (t *tui) buildLayout() *tui {
 	t.left = tview.NewFlex().SetDirection(tview.FlexRow).
 		AddItem(t.hintBar, 1, 0, false).
-		AddItem(t.serverList, 0, 1, true)
+		AddItem(t.serverList, 0, 1, true).
+		AddItem(t.sessions, 6, 0, false)
 
 	right := tview.NewFlex().SetDirection(tview.FlexRow).
 		AddItem(t.details, 0, 1, false)
@@ -175,6 +178,7 @@ func (t *tui) bindEvents() {
 
 func (t *tui) loadInitialData() {
 	t.loadServerList("")
+	t.loadActiveSessions()
 }
 
 func (t *tui) loadServerList(query string) {
@@ -186,6 +190,18 @@ func (t *tui) loadServerList(query string) {
 	t.serverList.UpdateServers(servers)
 }
 
+func (t *tui) loadActiveSessions() {
+	if t.sessions == nil {
+		return
+	}
+	sessions, err := t.serverService.ListActiveSessions()
+	if err != nil {
+		t.sessions.SetText(colorText(CurrentTheme.Error, "Failed to load active sessions"))
+		return
+	}
+	t.sessions.SetSessions(sessions)
+}
+
 func (t *tui) updateListTitle() {
 	if t.serverList != nil {
 		t.serverList.SetTitle(" 1 Servers — Sort: " + t.sortMode.String() + " ")
@@ -258,6 +274,7 @@ func (t *tui) restoreMainUIState(state mainUIState) {
 	}
 
 	t.loadServerList(state.query)
+	t.loadActiveSessions()
 	t.restoreSelectedServer(state)
 	t.restoreFocus(state)
 }

internal/core/domain/server.go

@@ -117,3 +117,11 @@ type Server struct {
 	// Debugging settings
 	LogLevel string
 }
+
+type ActiveSession struct {
+	PID         int
+	Alias       string
+	Destination string
+	Command     string
+	Forwards    []string
+}

internal/core/ports/services.go

@@ -22,6 +22,7 @@ import (
 
 type ServerService interface {
 	ListServers(query string) ([]domain.Server, error)
+	ListActiveSessions() ([]domain.ActiveSession, error)
 	UpdateServer(server domain.Server, newServer domain.Server) error
 	AddServer(server domain.Server) error
 	DeleteServer(server domain.Server) error