feat: support custom SSH config files via -c flag

.github/copilot-instructions.md

@@ -0,0 +1,426 @@
+# GitHub Copilot Instructions for Go + Bubble Tea (TUI)
+
+These project-level instructions tell Copilot how to generate idiomatic, production-quality Go code using the Bubble Tea ecosystem. **Follow and prefer these rules over generic patterns.**
+
+---
+
+## 1) Project Scope & Goals
+
+* Build terminal UIs with **[Bubble Tea](https://github.com/charmbracelet/bubbletea)** and **Bubbles** components.
+* Use **Lip Gloss** for styling and **Huh**/**Bubbles forms** for prompts where useful.
+* Favor **small, composable models** and **message-driven state**.
+* Prioritize **maintainability, testability, and clear separation** of update vs. view.
+
+---
+
+## 2) Go Conventions to Prefer
+
+* Go version: **1.22+**.
+* Module: `go.mod` with minimal, pinned dependencies; use `go get -u` only deliberately.
+* Code style: `gofmt`, `go vet`, `staticcheck` (when available), `golangci-lint`.
+* Names: short, meaningful; exported symbols require GoDoc comments.
+* Errors: return wrapped errors with `%w` and `errors.Is/As`. No panics for flow control.
+* Concurrency: use `context.Context` and `errgroup` where applicable. Avoid goroutine leaks; cancel contexts in `Quit`/`Stop`.
+* Testing: `*_test.go`, table-driven tests, golden tests for `View()` when helpful.
+* Logging: prefer structured logs (e.g., `slog`) and keep logs separate from UI rendering.
+
+---
+
+## 3) Bubble Tea Architecture Rules
+
+### 3.1 Model layout
+
+```go
+// Model holds all state needed to render and update.
+type Model struct {
+    width, height int
+    ready        bool
+
+    // Domain state
+    items   []Item
+    cursor  int
+    err     error
+
+    // Child components
+    list    list.Model
+    spinner spinner.Model
+
+    // Styles
+    styles  Styles
+}
+```
+
+**Guidelines**
+
+* Keep **domain state** (data) separate from **UI components** (Bubbles models) and **styles**.
+* Add a `Styles` struct to centralize Lip Gloss styles; initialize once.
+* Track terminal size (`width`, `height`); re-calc layout on `tea.WindowSizeMsg`.
+
+### 3.2 Init
+
+* Return **batch** of startup commands for IO (e.g., loading data) and component inits.
+* Never block in `Init`; do IO in `tea.Cmd`s.
+
+```go
+func (m Model) Init() tea.Cmd {
+    return tea.Batch(m.spinner.Tick, loadItemsCmd())
+}
+```
+
+### 3.3 Update
+
+* **Pure function** style: transform `Model` + `Msg` → `(Model, Cmd)`.
+* Always handle `tea.WindowSizeMsg` to set `m.width`/`m.height` and recompute layout.
+* Use **type-switched** message handling; push side effects into `tea.Cmd`s.
+* Bubble components: call `Update(msg)` on children and **return their Cmd**.
+
+```go
+func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+    switch msg := msg.(type) {
+    case tea.WindowSizeMsg:
+        m.width, m.height = msg.Width, msg.Height
+        m.styles = NewStyles(m.width) // recompute if responsive
+        return m, nil
+
+    case errMsg:
+        m.err = msg
+        return m, nil
+
+    case itemsLoaded:
+        m.items = msg
+        return m, nil
+    }
+
+    // delegate to children last
+    var cmd tea.Cmd
+    m.spinner, cmd = m.spinner.Update(msg)
+    return m, cmd
+}
+```
+
+### 3.4 View
+
+* **Never** mutate state in `View()`.
+* Compose layout with Lip Gloss; gracefully handle small terminals.
+* Put errors and help at the bottom.
+
+```go
+func (m Model) View() string {
+    if !m.ready {
+        return m.styles.Loading.Render(m.spinner.View() + " Loading…")
+    }
+    main := lipgloss.JoinVertical(lipgloss.Left,
+        m.styles.Title.Render("My App"),
+        m.list.View(),
+    )
+    if m.err != nil {
+        main += "\n" + m.styles.Error.Render(m.err.Error())
+    }
+    return m.styles.App.Render(main)
+}
+```
+
+### 3.5 Messages & Commands
+
+* Define **typed messages** for domain events, not raw strings.
+* Each async operation returns a **message type**; handle errors with a dedicated `errMsg`.
+
+```go
+type itemsLoaded []Item
+
+type errMsg error
+
+func loadItemsCmd() tea.Cmd {
+    return func() tea.Msg {
+        items, err := fetchItems()
+        if err != nil { return errMsg(err) }
+        return itemsLoaded(items)
+    }
+}
+```
+
+### 3.6 Keys & Help
+
+* Centralize keybindings and help text. Prefer `bubbles/key` + `bubbles/help`.
+
+```go
+type keyMap struct {
+    Up, Down, Select, Quit key.Binding
+}
+
+var keys = keyMap{
+    Up:     key.NewBinding(key.WithKeys("up", "k"), key.WithHelp("↑/k", "up")),
+    Down:   key.NewBinding(key.WithKeys("down", "j"), key.WithHelp("↓/j", "down")),
+    Select: key.NewBinding(key.WithKeys("enter"), key.WithHelp("enter", "select")),
+    Quit:   key.NewBinding(key.WithKeys("q", "ctrl+c"), key.WithHelp("q", "quit")),
+}
+```
+
+Handle keys in `Update` using `key.Matches(msg, keys.X)` and show a `help.Model` in the footer.
+
+### 3.7 Submodels (Component Composition)
+
+* For complex screens, create **submodels** with their own `(Model, Init, Update, View)` and wire them into a parent.
+* Exchange messages via **custom Msg types** and/or **parent state**.
+* Keep submodels **pure**; IO still goes through parent-level `tea.Cmd`s or via submodel commands returned to parent.
+
+### 3.8 Program Options
+
+* Start programs with `tea.NewProgram(m, tea.WithOutput(os.Stdout), tea.WithAltScreen())` when full-screen; avoid AltScreen for simple tools.
+* Always handle **TTY absence** (e.g., piping); fall back to non-interactive.
+
+---
+
+## 4) Styling with Lip Gloss
+
+* Maintain a single `Styles` struct with named styles.
+* Compute widths once per resize; avoid per-cell Lip Gloss allocations in tight loops.
+* Use `lipgloss.JoinHorizontal/Vertical` for layout; avoid manual spacing where possible.
+
+```go
+type Styles struct {
+    App, Title, Error, Loading lipgloss.Style
+}
+
+func NewStyles(width int) Styles {
+    return Styles{
+        App:     lipgloss.NewStyle().Padding(1),
+        Title:   lipgloss.NewStyle().Bold(true),
+        Error:   lipgloss.NewStyle().Foreground(lipgloss.Color("9")),
+        Loading: lipgloss.NewStyle().Faint(true),
+    }
+}
+```
+
+---
+
+## 5) IO, Concurrency & Performance
+
+* **Never** perform blocking IO in `Update` directly; always return a `tea.Cmd` that does the work.
+* Use `context.Context` inside commands; respect cancellation when program exits.
+* Be careful with **goroutine leaks**: ensure commands stop when model quits.
+* Batch commands with `tea.Batch` to keep updates snappy.
+* For large lists, prefer `bubbles/list` with virtualization; avoid generating huge strings per frame.
+* Debounce high-frequency events (typing) with timer-based commands.
+
+---
+
+## 6) Error Handling & UX
+
+* Represent recoverable errors in the UI; do not exit on first error.
+* Use `errMsg` for async failures; show a concise, styled error line.
+* For fatal initialization errors, return `tea.Quit` with an explanatory message printed once.
+
+---
+
+## 7) Keys, Shortcuts, and Accessibility
+
+* Provide **discoverable shortcuts** via a footer help view.
+* Offer Emacs-style alternatives where it makes sense (e.g., `ctrl+n/p`).
+* Use consistent navigation patterns across screens.
+
+---
+
+## 8) Testing Strategy
+
+* Unit test message handling with deterministic messages.
+* Snapshot/golden-test `View()` output for known terminal sizes.
+* Fuzz-test parsers/formatters used by the UI.
+
+```go
+func TestUpdate_Select(t *testing.T) {
+    m := newTestModel()
+    _, _ = m.Update(tea.KeyMsg{Type: tea.KeyEnter})
+    if got, want := m.cursor, 1; got != want { t.Fatalf("cursor=%d want %d", got, want) }
+}
+```
+
+---
+
+## 9) Project Structure Template
+
+```
+cmd/
+  app/
+    main.go
+internal/
+  tui/
+    model.go      // root model, styles
+    update.go     // Update + messages
+    view.go       // View
+    keys.go       // keymap/help
+    components/   // submodels
+  domain/        // business logic, pure Go
+  io/            // adapters (API, FS, net)
+
+Makefile         // lint, test, run targets
+```
+
+---
+
+## 10) Scaffolding Snippets (Ask Copilot to use these)
+
+### 10.1 Root main.go
+
+```go
+package main
+
+import (
+    "context"
+    "log"
+    "os"
+
+    tea "github.com/charmbracelet/bubbletea"
+)
+
+func main() {
+    if !isTTY() { // optional: detect piping
+        log.Println("Non-interactive mode not implemented.")
+        return
+    }
+
+    p := tea.NewProgram(NewModel(), tea.WithAltScreen())
+    if _, err := p.Run(); err != nil {
+        log.Fatalf("error: %v", err)
+    }
+}
+```
+
+### 10.2 NewModel()
+
+```go
+func NewModel() Model {
+    s := NewStyles(0)
+    return Model{
+        list:    newList(),
+        spinner: spinner.New(),
+        styles:  s,
+    }
+}
+```
+
+### 10.3 Custom messages
+
+```go
+type (
+    errMsg      error
+    itemsLoaded []Item
+)
+```
+
+### 10.4 Command helper
+
+```go
+func do(cmd func(context.Context) (tea.Msg, error)) tea.Cmd {
+    return func() tea.Msg {
+        ctx, cancel := context.WithCancel(context.Background())
+        defer cancel()
+        msg, err := cmd(ctx)
+        if err != nil { return errMsg(err) }
+        return msg
+    }
+}
+```
+
+---
+
+## 11) Dependencies to Prefer
+
+* `github.com/charmbracelet/bubbletea`
+* `github.com/charmbracelet/bubbles`
+* `github.com/charmbracelet/lipgloss`
+* `golang.org/x/sync/errgroup` (for non-UI workloads)
+* `log/slog` (Go 1.21+) for logging
+
+Pin versions in `go.mod`. Avoid extra UI deps unless justified.
+
+---
+
+## 12) Copilot Prompting Rules (Important)
+
+* When the user writes a new TUI screen, **scaffold** `(Model, Init, Update, View)` with:
+
+  * Window size handling
+  * Keymap/help wiring
+  * Styles struct and `NewStyles(width)`
+  * Commands for all IO
+* Prefer **typed messages** and return **`tea.Cmd`**; do not perform blocking work in `Update`.
+* Always update child bubble components via `child.Update(msg)` and collect cmds with `tea.Batch`.
+* Generate **tests** for key message paths.
+* Include **help footer** with keybindings.
+* Keep `View()` pure and free of side effects.
+
+**Bad**
+
+* Doing HTTP/FS work directly in `Update`.
+* Printing to stdout from `Update`/`View`.
+* Storing `context.Context` in the model.
+* Creating goroutines that outlive the program.
+
+**Good**
+
+* Commands that return typed messages.
+* Centralized keymap + help.
+* Single source of truth for styles.
+* Small submodels and composition.
+
+---
+
+## 13) Security & Reliability
+
+* Validate all external inputs; sanitize strings rendered into the terminal.
+* Respect user locale and UTF-8; avoid slicing strings by bytes for widths (use `lipgloss.Width`).
+* Handle small terminal sizes (min-width fallbacks).
+* Ensure graceful shutdown; propagate quit via `tea.Quit` and cancel pending work.
+
+---
+
+## 14) Makefile Targets (suggested)
+
+```
+.PHONY: run test lint fmt tidy
+run:; go run ./cmd/app
+fmt:; go fmt ./...
+lint:; golangci-lint run
+ test:; go test ./...
+tidy:; go mod tidy
+```
+
+---
+
+## 15) Example Key Handling Pattern
+
+```go
+case tea.KeyMsg:
+    switch {
+    case key.Matches(msg, keys.Quit):
+        return m, tea.Quit
+    case key.Matches(msg, keys.Up):
+        if m.cursor > 0 { m.cursor-- }
+    case key.Matches(msg, keys.Down):
+        if m.cursor < len(m.items)-1 { m.cursor++ }
+    }
+```
+
+---
+
+## 16) Documentation & Comments
+
+* Exported types/functions must have a sentence GoDoc.
+* At the top of each file, include a short comment describing its responsibility.
+* For non-obvious state transitions, include a brief state diagram in comments.
+
+---
+
+## 17) Acceptance Criteria for Generated Code
+
+* Builds with `go build ./...`
+* Passes `go vet` and `golangci-lint` (if configured)
+* Has at least one table-driven test per major update path
+* Handles window resize and quit
+* No side effects in `View()`
+* Commands wrap errors and return `errMsg`
+
+---
+
+*End of instructions.*

cmd/root.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"strings"
 
 	"sshm/internal/config"
 	"sshm/internal/ui"
@@ -14,6 +15,9 @@ import (
 // version will be set at build time via -ldflags
 var version = "dev"
 
+// configFile holds the path to the SSH config file
+var configFile string
+
 var rootCmd = &cobra.Command{
 	Use:   "sshm",
 	Short: "SSH Manager - A modern SSH connection manager",
@@ -36,7 +40,15 @@ configured in your ~/.ssh/config file.`,
 
 func runInteractiveMode() {
 	// Parse SSH configurations
-	hosts, err := config.ParseSSHConfig()
+	var hosts []config.SSHHost
+	var err error
+
+	if configFile != "" {
+		hosts, err = config.ParseSSHConfigFile(configFile)
+	} else {
+		hosts, err = config.ParseSSHConfig()
+	}
+
 	if err != nil {
 		log.Fatalf("Error reading SSH config file: %v", err)
 	}
@@ -52,7 +64,11 @@ func runInteractiveMode() {
 				fmt.Printf("Error adding host: %v\n", err)
 			}
 			// After adding, try to reload hosts and continue if any exist
-			hosts, err = config.ParseSSHConfig()
+			if configFile != "" {
+				hosts, err = config.ParseSSHConfigFile(configFile)
+			} else {
+				hosts, err = config.ParseSSHConfig()
+			}
 			if err != nil || len(hosts) == 0 {
 				fmt.Println("No hosts available, exiting.")
 				os.Exit(1)
@@ -64,14 +80,22 @@ func runInteractiveMode() {
 	}
 
 	// Run the interactive TUI
-	if err := ui.RunInteractiveMode(hosts); err != nil {
+	if err := ui.RunInteractiveMode(hosts, configFile); err != nil {
 		log.Fatalf("Error running interactive mode: %v", err)
 	}
 }
 
 func connectToHost(hostName string) {
 	// Parse SSH configurations to verify host exists
-	hosts, err := config.ParseSSHConfig()
+	var hosts []config.SSHHost
+	var err error
+
+	if configFile != "" {
+		hosts, err = config.ParseSSHConfigFile(configFile)
+	} else {
+		hosts, err = config.ParseSSHConfig()
+	}
+
 	if err != nil {
 		log.Fatalf("Error reading SSH config file: %v", err)
 	}
@@ -93,9 +117,18 @@ func connectToHost(hostName string) {
 
 	// Connect to the host
 	fmt.Printf("Connecting to %s...\n", hostName)
+
+	// Build the SSH command with the appropriate config file
+	var sshCmd []string
+	if configFile != "" {
+		sshCmd = []string{"ssh", "-F", configFile, hostName}
+	} else {
+		sshCmd = []string{"ssh", hostName}
+	}
+
 	// Note: In a real implementation, you'd use exec.Command here
 	// For now, just print the command that would be executed
-	fmt.Printf("ssh %s\n", hostName)
+	fmt.Printf("%s\n", strings.Join(sshCmd, " "))
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.
@@ -105,3 +138,8 @@ func Execute() {
 		os.Exit(1)
 	}
 }
+
+func init() {
+	// Add the config file flag
+	rootCmd.PersistentFlags().StringVarP(&configFile, "config", "c", "", "SSH config file to use (default: ~/.ssh/config)")
+}

internal/config/ssh.go

@@ -181,15 +181,18 @@ func ParseSSHConfigFile(configPath string) ([]SSHHost, error) {
 
 // AddSSHHost adds a new SSH host to the config file
 func AddSSHHost(host SSHHost) error {
-	configMutex.Lock()
-	defer configMutex.Unlock()
-
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
 		return err
 	}
-
 	configPath := filepath.Join(homeDir, ".ssh", "config")
+	return AddSSHHostToFile(host, configPath)
+}
+
+// AddSSHHostToFile adds a new SSH host to a specific config file
+func AddSSHHostToFile(host SSHHost, configPath string) error {
+	configMutex.Lock()
+	defer configMutex.Unlock()
 
 	// Create backup before modification if file exists
 	if _, err := os.Stat(configPath); err == nil {
@@ -198,8 +201,8 @@ func AddSSHHost(host SSHHost) error {
 		}
 	}
 
-	// Check if host already exists
+	// Check if host already exists in the specified config file
-	exists, err := HostExists(host.Name)
+	exists, err := HostExistsInFile(host.Name, configPath)
 	if err != nil {
 		return err
 	}
@@ -354,6 +357,21 @@ func HostExists(hostName string) (bool, error) {
 	return false, nil
 }
 
+// HostExistsInFile checks if a host exists in a specific config file
+func HostExistsInFile(hostName string, configPath string) (bool, error) {
+	hosts, err := ParseSSHConfigFile(configPath)
+	if err != nil {
+		return false, err
+	}
+
+	for _, host := range hosts {
+		if host.Name == hostName {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 // GetSSHHost retrieves a specific host configuration by name
 func GetSSHHost(hostName string) (*SSHHost, error) {
 	hosts, err := ParseSSHConfig()
@@ -369,17 +387,35 @@ func GetSSHHost(hostName string) (*SSHHost, error) {
 	return nil, fmt.Errorf("host '%s' not found", hostName)
 }
 
+// GetSSHHostFromFile retrieves a specific host configuration by name from a specific config file
+func GetSSHHostFromFile(hostName string, configPath string) (*SSHHost, error) {
+	hosts, err := ParseSSHConfigFile(configPath)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, host := range hosts {
+		if host.Name == hostName {
+			return &host, nil
+		}
+	}
+	return nil, fmt.Errorf("host '%s' not found", hostName)
+}
+
 // UpdateSSHHost updates an existing SSH host configuration
 func UpdateSSHHost(oldName string, newHost SSHHost) error {
-	configMutex.Lock()
-	defer configMutex.Unlock()
-
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
 		return err
 	}
-
 	configPath := filepath.Join(homeDir, ".ssh", "config")
+	return UpdateSSHHostInFile(oldName, newHost, configPath)
+}
+
+// UpdateSSHHostInFile updates an existing SSH host configuration in a specific file
+func UpdateSSHHostInFile(oldName string, newHost SSHHost, configPath string) error {
+	configMutex.Lock()
+	defer configMutex.Unlock()
 
 	// Create backup before modification
 	if err := backupConfig(configPath); err != nil {
@@ -528,15 +564,18 @@ func UpdateSSHHost(oldName string, newHost SSHHost) error {
 
 // DeleteSSHHost removes an SSH host configuration from the config file
 func DeleteSSHHost(hostName string) error {
-	configMutex.Lock()
-	defer configMutex.Unlock()
-
 	homeDir, err := os.UserHomeDir()
 	if err != nil {
 		return err
 	}
-
 	configPath := filepath.Join(homeDir, ".ssh", "config")
+	return DeleteSSHHostFromFile(hostName, configPath)
+}
+
+// DeleteSSHHostFromFile deletes an SSH host from a specific config file
+func DeleteSSHHostFromFile(hostName, configPath string) error {
+	configMutex.Lock()
+	defer configMutex.Unlock()
 
 	// Create backup before modification
 	if err := backupConfig(configPath); err != nil {

internal/ui/add_form.go

@@ -13,17 +13,18 @@ import (
 )
 
 type addFormModel struct {
-	inputs  []textinput.Model
+	inputs     []textinput.Model
-	focused int
+	focused    int
-	err     string
+	err        string
-	styles  Styles
+	styles     Styles
-	success bool
+	success    bool
-	width   int
+	width      int
-	height  int
+	height     int
+	configFile string
 }
 
 // NewAddForm creates a new add form model
-func NewAddForm(hostname string, styles Styles, width, height int) *addFormModel {
+func NewAddForm(hostname string, styles Styles, width, height int, configFile string) *addFormModel {
 	// Get current user for default
 	currentUser, _ := user.Current()
 	defaultUser := "root"
@@ -100,11 +101,12 @@ func NewAddForm(hostname string, styles Styles, width, height int) *addFormModel
 	inputs[tagsInput].Width = 50
 
 	return &addFormModel{
-		inputs:  inputs,
+		inputs:     inputs,
-		focused: nameInput,
+		focused:    nameInput,
-		styles:  styles,
+		styles:     styles,
-		width:   width,
+		width:      width,
-		height:  height,
+		height:     height,
+		configFile: configFile,
 	}
 }
 
@@ -270,7 +272,7 @@ func (m standaloneAddForm) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 // RunAddForm provides backward compatibility for standalone add form
 func RunAddForm(hostname string) error {
 	styles := NewStyles(80)
-	addForm := NewAddForm(hostname, styles, 80, 24)
+	addForm := NewAddForm(hostname, styles, 80, 24, "")
 	m := standaloneAddForm{addForm}
 
 	p := tea.NewProgram(m, tea.WithAltScreen())
@@ -327,7 +329,12 @@ func (m *addFormModel) submitForm() tea.Cmd {
 		}
 
 		// Add to config
-		err := config.AddSSHHost(host)
+		var err error
+		if m.configFile != "" {
+			err = config.AddSSHHostToFile(host, m.configFile)
+		} else {
+			err = config.AddSSHHost(host)
+		}
 		return addFormSubmitMsg{hostname: name, err: err}
 	}
 }

internal/ui/edit_form.go

@@ -18,12 +18,21 @@ type editFormModel struct {
 	originalName string
 	width        int
 	height       int
+	configFile   string
 }
 
 // NewEditForm creates a new edit form model
-func NewEditForm(hostName string, styles Styles, width, height int) (*editFormModel, error) {
+func NewEditForm(hostName string, styles Styles, width, height int, configFile string) (*editFormModel, error) {
 	// Get the existing host configuration
-	host, err := config.GetSSHHost(hostName)
+	var host *config.SSHHost
+	var err error
+
+	if configFile != "" {
+		host, err = config.GetSSHHostFromFile(hostName, configFile)
+	} else {
+		host, err = config.GetSSHHost(hostName)
+	}
+
 	if err != nil {
 		return nil, err
 	}
@@ -93,6 +102,7 @@ func NewEditForm(hostName string, styles Styles, width, height int) (*editFormMo
 		inputs:       inputs,
 		focused:      nameInput,
 		originalName: hostName,
+		configFile:   configFile,
 		styles:       styles,
 		width:        width,
 		height:       height,
@@ -250,7 +260,7 @@ func (m standaloneEditForm) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 // RunEditForm provides backward compatibility for standalone edit form
 func RunEditForm(hostName string) error {
 	styles := NewStyles(80)
-	editForm, err := NewEditForm(hostName, styles, 80, 24)
+	editForm, err := NewEditForm(hostName, styles, 80, 24, "")
 	if err != nil {
 		return err
 	}
@@ -308,7 +318,12 @@ func (m *editFormModel) submitEditForm() tea.Cmd {
 		}
 
 		// Update the configuration
-		err := config.UpdateSSHHost(m.originalName, host)
+		var err error
+		if m.configFile != "" {
+			err = config.UpdateSSHHostInFile(m.originalName, host, m.configFile)
+		} else {
+			err = config.UpdateSSHHost(m.originalName, host)
+		}
 		return editFormSubmitMsg{hostname: name, err: err}
 	}
 }

internal/ui/model.go

@@ -48,6 +48,7 @@ type Model struct {
 	deleteHost     string
 	historyManager *history.HistoryManager
 	sortMode       SortMode
+	configFile     string // Path to the SSH config file
 
 	// View management
 	viewMode ViewMode

internal/ui/tui.go

@@ -14,7 +14,7 @@ import (
 )
 
 // NewModel creates a new TUI model with the given SSH hosts
-func NewModel(hosts []config.SSHHost) Model {
+func NewModel(hosts []config.SSHHost, configFile string) Model {
 	// Initialize the history manager
 	historyManager, err := history.NewHistoryManager()
 	if err != nil {
@@ -31,6 +31,7 @@ func NewModel(hosts []config.SSHHost) Model {
 		hosts:          hosts,
 		historyManager: historyManager,
 		sortMode:       SortByName,
+		configFile:     configFile,
 		styles:         styles,
 		width:          80,
 		height:         24,
@@ -138,8 +139,8 @@ func NewModel(hosts []config.SSHHost) Model {
 }
 
 // RunInteractiveMode starts the interactive TUI interface
-func RunInteractiveMode(hosts []config.SSHHost) error {
+func RunInteractiveMode(hosts []config.SSHHost, configFile string) error {
-	m := NewModel(hosts)
+	m := NewModel(hosts, configFile)
 
 	// Start the application in alt screen mode for clean output
 	p := tea.NewProgram(m, tea.WithAltScreen())

internal/ui/update.go

@@ -53,7 +53,15 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			return m, nil
 		} else {
 			// Success: refresh hosts and return to list view
-			hosts, err := config.ParseSSHConfig()
+			var hosts []config.SSHHost
+			var err error
+
+			if m.configFile != "" {
+				hosts, err = config.ParseSSHConfigFile(m.configFile)
+			} else {
+				hosts, err = config.ParseSSHConfig()
+			}
+
 			if err != nil {
 				return m, tea.Quit
 			}
@@ -82,7 +90,15 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			return m, nil
 		} else {
 			// Success: refresh hosts and return to list view
-			hosts, err := config.ParseSSHConfig()
+			var hosts []config.SSHHost
+			var err error
+
+			if m.configFile != "" {
+				hosts, err = config.ParseSSHConfigFile(m.configFile)
+			} else {
+				hosts, err = config.ParseSSHConfig()
+			}
+
 			if err != nil {
 				return m, tea.Quit
 			}
@@ -183,7 +199,12 @@ func (m Model) handleListViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			return m, nil
 		} else if m.deleteMode {
 			// Confirm deletion
-			err := config.DeleteSSHHost(m.deleteHost)
+			var err error
+			if m.configFile != "" {
+				err = config.DeleteSSHHostFromFile(m.deleteHost, m.configFile)
+			} else {
+				err = config.DeleteSSHHost(m.deleteHost)
+			}
 			if err != nil {
 				// Could display an error message here
 				m.deleteMode = false
@@ -192,8 +213,16 @@ func (m Model) handleListViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 				return m, nil
 			}
 			// Refresh the hosts list
-			hosts, err := config.ParseSSHConfig()
+			var hosts []config.SSHHost
-			if err != nil {
+			var parseErr error
+
+			if m.configFile != "" {
+				hosts, parseErr = config.ParseSSHConfigFile(m.configFile)
+			} else {
+				hosts, parseErr = config.ParseSSHConfig()
+			}
+
+			if parseErr != nil {
 				// Could display an error message here
 				m.deleteMode = false
 				m.deleteHost = ""
@@ -222,7 +251,15 @@ func (m Model) handleListViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 					}
 				}
 
-				return m, tea.ExecProcess(exec.Command("ssh", hostName), func(err error) tea.Msg {
+				// Build the SSH command with the appropriate config file
+				var sshCmd *exec.Cmd
+				if m.configFile != "" {
+					sshCmd = exec.Command("ssh", "-F", m.configFile, hostName)
+				} else {
+					sshCmd = exec.Command("ssh", hostName)
+				}
+
+				return m, tea.ExecProcess(sshCmd, func(err error) tea.Msg {
 					return tea.Quit()
 				})
 			}
@@ -233,7 +270,7 @@ func (m Model) handleListViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			selected := m.table.SelectedRow()
 			if len(selected) > 0 {
 				hostName := selected[0] // The hostname is in the first column
-				editForm, err := NewEditForm(hostName, m.styles, m.width, m.height)
+				editForm, err := NewEditForm(hostName, m.styles, m.width, m.height, m.configFile)
 				if err != nil {
 					// Handle error - could show in UI
 					return m, nil
@@ -246,7 +283,7 @@ func (m Model) handleListViewKeys(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	case "a":
 		if !m.searchMode && !m.deleteMode {
 			// Add a new host
-			m.addForm = NewAddForm("", m.styles, m.width, m.height)
+			m.addForm = NewAddForm("", m.styles, m.width, m.height, m.configFile)
 			m.viewMode = ViewAdd
 			return m, textinput.Blink
 		}