feat(tui): add dual-pane SFTP file browser

AGENTS.md

@@ -28,7 +28,7 @@ govulncheck ./...       # vulnerability scan
 |---|---|
 | `main.go` | CLI entry, urfave/cli v3 flags, version check goroutine (WaitGroup-tracked, 5s timeout) |
 | `pkg/sshconf/` | Config parsing, thread-safe, `Parse()`/`ParsePath()`, symlink resolution, permission check |
-| `pkg/tui/` | Bubbletea model, host list, run-command sub-model, logging, themes |
+| `pkg/tui/` | Bubbletea model, host list, run-command sub-model, SFTP file browser sub-model, logging, themes |
 
 ## Release
 
@@ -52,11 +52,12 @@ Goreleaser config: `.config/goreleaser.yaml` (v2, 4 OS × 2 arches, deb/rpm/home
 - Table-driven with `t.Run()` subtests, standard library assertions
 - `pkg/sshconf/parser_test.go` — integration tests using `data/config_example`
 - `pkg/tui/model_test.go`, `pkg/tui/list_test.go`, `pkg/tui/runcmd_test.go` — TUI model tests
+- `pkg/tui/sftp_test.go` — SFTP sub-model tests (file items, panes, transfers, confirmations, history)
 - `pkg/tui/log_test.go`, `pkg/tui/themes_test.go` — component tests
 - `pkg/tui/testdata/test_config` — shared test fixture (8 tagged hosts)
 - `pkg/tui/test_helpers.go` — shared test helpers (matrixTheme, newTestConfig, etc.)
 - Target 80%+ coverage; skip tests if external commands missing
-- Current: 85.4% across 92 tests in 5 files
+- Current: 132+ tests across 6 files (85%+ coverage)
 
 ## Benchmarking
 
@@ -92,6 +93,7 @@ make bench-compare    # compare bench-old.txt vs bench-new.txt via benchstat
 - **`x/ansi@v0.9.2`, `colorprofile@v0.3.1`** pinned — newer versions break lipgloss compatibility
 - **Segfault.net** support removed in 0.4.1
 - **Sensitive keys** (identityfile, proxycommand, etc.) filtered from config viewport
+- **SFTP** — uses `github.com/pkg/sftp` via `ssh -s sftp` subsystem pipe, `BatchMode=yes` prevents interactive hangs
 - **`--` delimiter** before hostname in all SSH/mosh/syscall invocations (anti-injection)
 - **Bubbletea v2 API**: `tea.KeyPressMsg` replaces `tea.KeyMsg`, `list.SetFilterText()` not `SetFilterValue`, `viewport.GetContent()` not `Content`, `tea.View` cannot be compared to `nil`
 
@@ -101,4 +103,6 @@ make bench-compare    # compare bench-old.txt vs bench-new.txt via benchstat
 - SSH stderr sanitized (truncated to 500 chars)
 - ANSI escape sequences stripped from remote command output
 - Debug logs only collected when debug mode is active
+- SFTP connections use `BatchMode=yes` + `RequestTTY=no` to prevent interactive prompts
+- In-flight SSH process tracked with `sync.Mutex` for safe cancellation on exit
 - Changelog formatted per keepachangelog.com, 1.0.0 semver for hardened v1

CHANGELOG.md

@@ -18,14 +18,22 @@
 - Replace custom `contains`/`searchSubstring` with `strings.Contains` in tests
 
 ## Add
+- SFTP file browser (`ctrl+s`) — dual-pane local ↔ remote file transfer using `github.com/pkg/sftp`
+  - Upload/download with file size display and transfer history buffer (50 entries)
+  - Overwrite confirmation dialog and delete operations on both panes
+  - Symlink detection in directory listings
+  - SSH batch mode (`StrictHostKeyChecking=no`, `BatchMode=yes`, `RequestTTY=no`)
+  - Theme-consistent UI with solid background bar headers and adaptive colors
+  - Remote pane starts in `/tmp` by default
 - `make lint` target (golangci-lint if available, fallback to go fmt + go vet)
 - `make bench`, `make bench-cpu`, `make bench-mem`, `make bench-compare` targets
 - Benchmark suite for `sshconf` (ParsePath, GetHost, GetHosts, GetParamFor, RemoveComments, IsSensitiveKey)
 - Benchmark suite for `tui` (setConfig, formatHost, sanitizeOutput, sanitizeStderr)
 
 ## Test
-- Add comprehensive TUI test suite (92 tests, 85% coverage)
+- Add comprehensive TUI test suite (132+ tests, 85%+ coverage)
 - Add `testdata/test_config` fixture and shared test helpers
+- Add SFTP test suite (`sftp_test.go`, 40+ tests covering file items, panes, transfers, confirmations, history limit)
 
 # [1.0.2] May 15, 2026
 

README.md

@@ -28,6 +28,7 @@ Built in Go + Bubble Tea.
 | `enter`   | Connect                          |
 | `ctrl+e`  | Edit config live                 |
 | `ctrl+r`  | Run command on host              |
+| `ctrl+s`  | SFTP file browser                |
 | `ctrl+v`  | Toggle config inspector          |
 | `tab`     | Switch SSH ↔ MOSH                |
 | `/`       | Fuzzy search                     |

go.mod

@@ -4,6 +4,7 @@ go 1.26.2
 
 require (
 	github.com/google/go-github/v69 v69.2.0
+	github.com/pkg/sftp v1.13.9
 	github.com/thalesfsp/go-common-types v0.2.6
 	github.com/urfave/cli/v3 v3.8.0
 	golang.org/x/term v0.43.0
@@ -15,6 +16,8 @@ require (
 	github.com/charmbracelet/x/ansi v0.11.7 // indirect
 	github.com/charmbracelet/x/termios v0.1.1 // indirect
 	github.com/clipperhouse/displaywidth v0.11.0 // indirect
+	github.com/kr/fs v0.1.0 // indirect
+	golang.org/x/crypto v0.31.0 // indirect
 )
 
 require (

go.sum

@@ -26,6 +26,7 @@ github.com/clipperhouse/displaywidth v0.11.0 h1:lBc6kY44VFw+TDx4I8opi/EtL9m20WSE
 github.com/clipperhouse/displaywidth v0.11.0/go.mod h1:bkrFNkf81G8HyVqmKGxsPufD3JhNl3dSqnGhOoSD/o0=
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 github.com/clipperhouse/uax29/v2 v2.7.0/go.mod h1:EFJ2TJMRUaplDxHKj1qAEhCtQPW2tJSwu5BF98AuoVM=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
@@ -34,6 +35,8 @@ github.com/google/go-github/v69 v69.2.0 h1:wR+Wi/fN2zdUx9YxSmYE0ktiX9IAR/BeePzea
 github.com/google/go-github/v69 v69.2.0/go.mod h1:xne4jymxLR6Uj9b7J7PyTpkMYstEMMwGZa0Aehh1azM=
 github.com/google/go-querystring v1.2.0 h1:yhqkPbu2/OH+V9BfpCVPZkNmUXhb2gBxJArfhIxNtP0=
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+github.com/kr/fs v0.1.0 h1:Jskdu9ieNAYnjxsi0LbQp1ulIKZV1LAFgK1tWhpZgl8=
+github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
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 github.com/lucasb-eyer/go-colorful v1.4.0 h1:UtrWVfLdarDgc44HcS7pYloGHJUjHV/4FwW4TvVgFr4=
@@ -42,12 +45,18 @@ github.com/mattn/go-runewidth v0.0.23 h1:7ykA0T0jkPpzSvMS5i9uoNn2Xy3R383f9HDx3Ry
 github.com/mattn/go-runewidth v0.0.23/go.mod h1:XBkDxAl56ILZc9knddidhrOlY5R/pDhgLpndooCuJAs=
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+github.com/pkg/sftp v1.13.9/go.mod h1:OBN7bVXdstkFFN/gdnHPUb5TE8eb8G1Rp9wCItqjkkA=
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@@ -56,13 +65,79 @@ github.com/urfave/cli/v3 v3.8.0 h1:XqKPrm0q4P0q5JpoclYoCAv0/MIvH/jZ2umzuf8pNTI=
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+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
+golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/tui/list.go

@@ -124,9 +124,19 @@ func initKeys() []key.Binding {
 		key.WithKeys("enter"),
 		key.WithHelp("enter", "connect"),
 	)
+	sftpKey := key.NewBinding(
+		key.WithKeys("ctrl+s"),
+		key.WithHelp("ctrl+s", "sftp"),
+	)
+	runCmdKey := key.NewBinding(
+		key.WithKeys("ctrl+r"),
+		key.WithHelp("ctrl+r", "run command"),
+	)
 	return []key.Binding{
 		connectKey,
 		switchKey,
+		sftpKey,
+		runCmdKey,
 		editKey,
 		showKey,
 	}

pkg/tui/list_test.go

@@ -220,13 +220,15 @@ func TestListFrom_HelpKeys(t *testing.T) {
 func TestInitKeys(t *testing.T) {
 	keys := initKeys()
 
-	if len(keys) != 4 {
-		t.Errorf("expected 4 key bindings, got %d", len(keys))
+	if len(keys) != 6 {
+		t.Errorf("expected 6 key bindings, got %d", len(keys))
 	}
 
 	expectedKeys := map[string]bool{
 		"enter":   false,
 		"tab":     false,
+		"ctrl+s":  false,
+		"ctrl+r":  false,
 		"ctrl+e":  false,
 		"ctrl+v": false,
 	}

pkg/tui/model.go

@@ -218,7 +218,7 @@ func (m *Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			case 'r':
 				return RunCmdModel(m), nil
 			case 's':
-				return m, AddError(fmt.Errorf("sftp: not yet implemented"))
+				return SftpModel(m), nil
 		case 'v':
 			m.showConfig = !m.showConfig
 			default:

pkg/tui/model_test.go

@@ -575,24 +575,14 @@ func TestModel_Update_CtrlB_CtrlF(t *testing.T) {
 	}
 }
 
-func TestModel_Update_CtrlS_NotImplemented(t *testing.T) {
+func TestModel_Update_CtrlS_SftpModel(t *testing.T) {
 	m := newTestModel(t, false)
-	m2, cmd := updateModelWithCmd(m, tea.KeyPressMsg{Code: 's', Mod: tea.ModCtrl})
+	result, _ := m.Update(tea.KeyPressMsg{Code: 's', Mod: tea.ModCtrl})
 
-	if cmd == nil {
-		t.Error("expected command for sftp error")
-	}
-
-	msg := cmd()
-	errMsg, ok := msg.(ErrorMsg)
+	_, ok := result.(*sftpModel)
 	if !ok {
-		t.Fatalf("expected ErrorMsg, got %T", msg)
-	}
-	if errMsg.Err == nil {
-		t.Error("expected error for sftp not implemented")
+		t.Fatalf("expected *sftpModel, got %T", result)
 	}
-
-	_ = m2
 }
 
 func TestModel_Update_UnknownCtrlKey(t *testing.T) {

pkg/tui/runcmd.go

@@ -222,7 +222,9 @@ func (m *cmdModel) View() tea.View {
 		builder.WriteString(m.input.View() + "\n\n")
 	}
 	builder.WriteString(m.viewport.View())
-	return tea.NewView(builder.String())
+	v := tea.NewView(builder.String())
+	v.AltScreen = true
+	return v
 }
 
 func (m *cmdModel) Bar() string {