1// Package app wires together services, coordinates agents, and manages
2// application lifecycle.
3package app
4
5import (
6 "context"
7 "database/sql"
8 "errors"
9 "fmt"
10 "io"
11 "log/slog"
12 "os"
13 "strings"
14 "sync"
15 "time"
16
17 tea "charm.land/bubbletea/v2"
18 "charm.land/fantasy"
19 "charm.land/lipgloss/v2"
20 "github.com/charmbracelet/catwalk/pkg/catwalk"
21 "github.com/charmbracelet/crush/internal/agent"
22 "github.com/charmbracelet/crush/internal/agent/tools/mcp"
23 "github.com/charmbracelet/crush/internal/config"
24 "github.com/charmbracelet/crush/internal/csync"
25 "github.com/charmbracelet/crush/internal/db"
26 "github.com/charmbracelet/crush/internal/filetracker"
27 "github.com/charmbracelet/crush/internal/format"
28 "github.com/charmbracelet/crush/internal/history"
29 "github.com/charmbracelet/crush/internal/log"
30 "github.com/charmbracelet/crush/internal/lsp"
31 "github.com/charmbracelet/crush/internal/message"
32 "github.com/charmbracelet/crush/internal/permission"
33 "github.com/charmbracelet/crush/internal/pubsub"
34 "github.com/charmbracelet/crush/internal/session"
35 "github.com/charmbracelet/crush/internal/shell"
36 "github.com/charmbracelet/crush/internal/tui/components/anim"
37 "github.com/charmbracelet/crush/internal/tui/styles"
38 "github.com/charmbracelet/crush/internal/update"
39 "github.com/charmbracelet/crush/internal/version"
40 "github.com/charmbracelet/x/ansi"
41 "github.com/charmbracelet/x/exp/charmtone"
42 "github.com/charmbracelet/x/term"
43)
44
45// UpdateAvailableMsg is sent when a new version is available.
46type UpdateAvailableMsg struct {
47 CurrentVersion string
48 LatestVersion string
49 IsDevelopment bool
50}
51
52type App struct {
53 Sessions session.Service
54 Messages message.Service
55 History history.Service
56 Permissions permission.Service
57 FileTracker filetracker.Service
58
59 AgentCoordinator agent.Coordinator
60
61 LSPClients *csync.Map[string, *lsp.Client]
62
63 config *config.Config
64
65 serviceEventsWG *sync.WaitGroup
66 eventsCtx context.Context
67 events chan tea.Msg
68 tuiWG *sync.WaitGroup
69
70 // global context and cleanup functions
71 globalCtx context.Context
72 cleanupFuncs []func() error
73}
74
75// New initializes a new application instance.
76func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
77 q := db.New(conn)
78 sessions := session.NewService(q, conn)
79 messages := message.NewService(q)
80 files := history.NewService(q, conn)
81 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
82 var allowedTools []string
83 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
84 allowedTools = cfg.Permissions.AllowedTools
85 }
86
87 app := &App{
88 Sessions: sessions,
89 Messages: messages,
90 History: files,
91 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
92 FileTracker: filetracker.NewService(q),
93 LSPClients: csync.NewMap[string, *lsp.Client](),
94
95 globalCtx: ctx,
96
97 config: cfg,
98
99 events: make(chan tea.Msg, 100),
100 serviceEventsWG: &sync.WaitGroup{},
101 tuiWG: &sync.WaitGroup{},
102 }
103
104 app.setupEvents()
105
106 // Initialize LSP clients in the background.
107 go app.initLSPClients(ctx)
108
109 // Check for updates in the background.
110 go app.checkForUpdates(ctx)
111
112 go func() {
113 slog.Info("Initializing MCP clients")
114 mcp.Initialize(ctx, app.Permissions, cfg)
115 }()
116
117 // cleanup database upon app shutdown
118 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close, mcp.Close)
119
120 // TODO: remove the concept of agent config, most likely.
121 if !cfg.IsConfigured() {
122 slog.Warn("No agent configuration found")
123 return app, nil
124 }
125 if err := app.InitCoderAgent(ctx); err != nil {
126 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
127 }
128 return app, nil
129}
130
131// Config returns the application configuration.
132func (app *App) Config() *config.Config {
133 return app.config
134}
135
136// RunNonInteractive runs the application in non-interactive mode with the
137// given prompt, printing to stdout.
138func (app *App) RunNonInteractive(ctx context.Context, output io.Writer, prompt, largeModel, smallModel string, hideSpinner bool) error {
139 slog.Info("Running in non-interactive mode")
140
141 ctx, cancel := context.WithCancel(ctx)
142 defer cancel()
143
144 if largeModel != "" || smallModel != "" {
145 if err := app.overrideModelsForNonInteractive(ctx, largeModel, smallModel); err != nil {
146 return fmt.Errorf("failed to override models: %w", err)
147 }
148 }
149
150 var (
151 spinner *format.Spinner
152 stdoutTTY bool
153 stderrTTY bool
154 stdinTTY bool
155 progress bool
156 )
157
158 if f, ok := output.(*os.File); ok {
159 stdoutTTY = term.IsTerminal(f.Fd())
160 }
161 stderrTTY = term.IsTerminal(os.Stderr.Fd())
162 stdinTTY = term.IsTerminal(os.Stdin.Fd())
163 progress = app.config.Options.Progress == nil || *app.config.Options.Progress
164
165 if !hideSpinner && stderrTTY {
166 t := styles.CurrentTheme()
167
168 // Detect background color to set the appropriate color for the
169 // spinner's 'Generating...' text. Without this, that text would be
170 // unreadable in light terminals.
171 hasDarkBG := true
172 if f, ok := output.(*os.File); ok && stdinTTY && stdoutTTY {
173 hasDarkBG = lipgloss.HasDarkBackground(os.Stdin, f)
174 }
175 defaultFG := lipgloss.LightDark(hasDarkBG)(charmtone.Pepper, t.FgBase)
176
177 spinner = format.NewSpinner(ctx, cancel, anim.Settings{
178 Size: 10,
179 Label: "Generating",
180 LabelColor: defaultFG,
181 GradColorA: t.Primary,
182 GradColorB: t.Secondary,
183 CycleColors: true,
184 })
185 spinner.Start()
186 }
187
188 // Helper function to stop spinner once.
189 stopSpinner := func() {
190 if !hideSpinner && spinner != nil {
191 spinner.Stop()
192 spinner = nil
193 }
194 }
195
196 // Wait for MCP initialization to complete before reading MCP tools.
197 if err := mcp.WaitForInit(ctx); err != nil {
198 return fmt.Errorf("failed to wait for MCP initialization: %w", err)
199 }
200
201 // force update of agent models before running so mcp tools are loaded
202 app.AgentCoordinator.UpdateModels(ctx)
203
204 defer stopSpinner()
205
206 const maxPromptLengthForTitle = 100
207 const titlePrefix = "Non-interactive: "
208 var titleSuffix string
209
210 if len(prompt) > maxPromptLengthForTitle {
211 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
212 } else {
213 titleSuffix = prompt
214 }
215 title := titlePrefix + titleSuffix
216
217 sess, err := app.Sessions.Create(ctx, title)
218 if err != nil {
219 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
220 }
221 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
222
223 // Automatically approve all permission requests for this non-interactive
224 // session.
225 app.Permissions.AutoApproveSession(sess.ID)
226
227 type response struct {
228 result *fantasy.AgentResult
229 err error
230 }
231 done := make(chan response, 1)
232
233 go func(ctx context.Context, sessionID, prompt string) {
234 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
235 if err != nil {
236 done <- response{
237 err: fmt.Errorf("failed to start agent processing stream: %w", err),
238 }
239 }
240 done <- response{
241 result: result,
242 }
243 }(ctx, sess.ID, prompt)
244
245 messageEvents := app.Messages.Subscribe(ctx)
246 messageReadBytes := make(map[string]int)
247 var printed bool
248
249 defer func() {
250 if progress && stderrTTY {
251 _, _ = fmt.Fprintf(os.Stderr, ansi.ResetProgressBar)
252 }
253
254 // Always print a newline at the end. If output is a TTY this will
255 // prevent the prompt from overwriting the last line of output.
256 _, _ = fmt.Fprintln(output)
257 }()
258
259 for {
260 if progress && stderrTTY {
261 // HACK: Reinitialize the terminal progress bar on every iteration
262 // so it doesn't get hidden by the terminal due to inactivity.
263 _, _ = fmt.Fprintf(os.Stderr, ansi.SetIndeterminateProgressBar)
264 }
265
266 select {
267 case result := <-done:
268 stopSpinner()
269 if result.err != nil {
270 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
271 slog.Debug("Non-interactive: agent processing cancelled", "session_id", sess.ID)
272 return nil
273 }
274 return fmt.Errorf("agent processing failed: %w", result.err)
275 }
276 return nil
277
278 case event := <-messageEvents:
279 msg := event.Payload
280 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
281 stopSpinner()
282
283 content := msg.Content().String()
284 readBytes := messageReadBytes[msg.ID]
285
286 if len(content) < readBytes {
287 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
288 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
289 }
290
291 part := content[readBytes:]
292 // Trim leading whitespace. Sometimes the LLM includes leading
293 // formatting and intentation, which we don't want here.
294 if readBytes == 0 {
295 part = strings.TrimLeft(part, " \t")
296 }
297 // Ignore initial whitespace-only messages.
298 if printed || strings.TrimSpace(part) != "" {
299 printed = true
300 fmt.Fprint(output, part)
301 }
302 messageReadBytes[msg.ID] = len(content)
303 }
304
305 case <-ctx.Done():
306 stopSpinner()
307 return ctx.Err()
308 }
309 }
310}
311
312func (app *App) UpdateAgentModel(ctx context.Context) error {
313 if app.AgentCoordinator == nil {
314 return fmt.Errorf("agent configuration is missing")
315 }
316 return app.AgentCoordinator.UpdateModels(ctx)
317}
318
319// overrideModelsForNonInteractive parses the model strings and temporarily
320// overrides the model configurations, then rebuilds the agent.
321// Format: "model-name" (searches all providers) or "provider/model-name".
322// Model matching is case-insensitive.
323// If largeModel is provided but smallModel is not, the small model defaults to
324// the provider's default small model.
325func (app *App) overrideModelsForNonInteractive(ctx context.Context, largeModel, smallModel string) error {
326 providers := app.config.Providers.Copy()
327
328 largeMatches, smallMatches, err := findModels(providers, largeModel, smallModel)
329 if err != nil {
330 return err
331 }
332
333 var largeProviderID string
334
335 // Override large model.
336 if largeModel != "" {
337 found, err := validateMatches(largeMatches, largeModel, "large")
338 if err != nil {
339 return err
340 }
341 largeProviderID = found.provider
342 slog.Info("Overriding large model for non-interactive run", "provider", found.provider, "model", found.modelID)
343 app.config.Models[config.SelectedModelTypeLarge] = config.SelectedModel{
344 Provider: found.provider,
345 Model: found.modelID,
346 }
347 }
348
349 // Override small model.
350 switch {
351 case smallModel != "":
352 found, err := validateMatches(smallMatches, smallModel, "small")
353 if err != nil {
354 return err
355 }
356 slog.Info("Overriding small model for non-interactive run", "provider", found.provider, "model", found.modelID)
357 app.config.Models[config.SelectedModelTypeSmall] = config.SelectedModel{
358 Provider: found.provider,
359 Model: found.modelID,
360 }
361
362 case largeModel != "":
363 // No small model specified, but large model was - use provider's default.
364 smallCfg := app.GetDefaultSmallModel(largeProviderID)
365 app.config.Models[config.SelectedModelTypeSmall] = smallCfg
366 }
367
368 return app.AgentCoordinator.UpdateModels(ctx)
369}
370
371// GetDefaultSmallModel returns the default small model for the given
372// provider. Falls back to the large model if no default is found.
373func (app *App) GetDefaultSmallModel(providerID string) config.SelectedModel {
374 cfg := app.config
375 largeModelCfg := cfg.Models[config.SelectedModelTypeLarge]
376
377 // Find the provider in the known providers list to get its default small model.
378 knownProviders, _ := config.Providers(cfg)
379 var knownProvider *catwalk.Provider
380 for _, p := range knownProviders {
381 if string(p.ID) == providerID {
382 knownProvider = &p
383 break
384 }
385 }
386
387 // For unknown/local providers, use the large model as small.
388 if knownProvider == nil {
389 slog.Warn("Using large model as small model for unknown provider", "provider", providerID, "model", largeModelCfg.Model)
390 return largeModelCfg
391 }
392
393 defaultSmallModelID := knownProvider.DefaultSmallModelID
394 model := cfg.GetModel(providerID, defaultSmallModelID)
395 if model == nil {
396 slog.Warn("Default small model not found, using large model", "provider", providerID, "model", largeModelCfg.Model)
397 return largeModelCfg
398 }
399
400 slog.Info("Using provider default small model", "provider", providerID, "model", defaultSmallModelID)
401 return config.SelectedModel{
402 Provider: providerID,
403 Model: defaultSmallModelID,
404 MaxTokens: model.DefaultMaxTokens,
405 ReasoningEffort: model.DefaultReasoningEffort,
406 }
407}
408
409func (app *App) setupEvents() {
410 ctx, cancel := context.WithCancel(app.globalCtx)
411 app.eventsCtx = ctx
412 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
413 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
414 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
415 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
416 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
417 setupSubscriber(ctx, app.serviceEventsWG, "mcp", mcp.SubscribeEvents, app.events)
418 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
419 cleanupFunc := func() error {
420 cancel()
421 app.serviceEventsWG.Wait()
422 return nil
423 }
424 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
425}
426
427func setupSubscriber[T any](
428 ctx context.Context,
429 wg *sync.WaitGroup,
430 name string,
431 subscriber func(context.Context) <-chan pubsub.Event[T],
432 outputCh chan<- tea.Msg,
433) {
434 wg.Go(func() {
435 subCh := subscriber(ctx)
436 for {
437 select {
438 case event, ok := <-subCh:
439 if !ok {
440 slog.Debug("Subscription channel closed", "name", name)
441 return
442 }
443 var msg tea.Msg = event
444 select {
445 case outputCh <- msg:
446 case <-time.After(2 * time.Second):
447 slog.Debug("Message dropped due to slow consumer", "name", name)
448 case <-ctx.Done():
449 slog.Debug("Subscription cancelled", "name", name)
450 return
451 }
452 case <-ctx.Done():
453 slog.Debug("Subscription cancelled", "name", name)
454 return
455 }
456 }
457 })
458}
459
460func (app *App) InitCoderAgent(ctx context.Context) error {
461 coderAgentCfg := app.config.Agents[config.AgentCoder]
462 if coderAgentCfg.ID == "" {
463 return fmt.Errorf("coder agent configuration is missing")
464 }
465 var err error
466 app.AgentCoordinator, err = agent.NewCoordinator(
467 ctx,
468 app.config,
469 app.Sessions,
470 app.Messages,
471 app.Permissions,
472 app.History,
473 app.FileTracker,
474 app.LSPClients,
475 )
476 if err != nil {
477 slog.Error("Failed to create coder agent", "err", err)
478 return err
479 }
480 return nil
481}
482
483// Subscribe sends events to the TUI as tea.Msgs.
484func (app *App) Subscribe(program *tea.Program) {
485 defer log.RecoverPanic("app.Subscribe", func() {
486 slog.Info("TUI subscription panic: attempting graceful shutdown")
487 program.Quit()
488 })
489
490 app.tuiWG.Add(1)
491 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
492 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
493 slog.Debug("Cancelling TUI message handler")
494 tuiCancel()
495 app.tuiWG.Wait()
496 return nil
497 })
498 defer app.tuiWG.Done()
499
500 for {
501 select {
502 case <-tuiCtx.Done():
503 slog.Debug("TUI message handler shutting down")
504 return
505 case msg, ok := <-app.events:
506 if !ok {
507 slog.Debug("TUI message channel closed")
508 return
509 }
510 program.Send(msg)
511 }
512 }
513}
514
515// Shutdown performs a graceful shutdown of the application.
516func (app *App) Shutdown() {
517 start := time.Now()
518 defer func() { slog.Debug("Shutdown took " + time.Since(start).String()) }()
519
520 // First, cancel all agents and wait for them to finish. This must complete
521 // before closing the DB so agents can finish writing their state.
522 if app.AgentCoordinator != nil {
523 app.AgentCoordinator.CancelAll()
524 }
525
526 // Now run remaining cleanup tasks in parallel.
527 var wg sync.WaitGroup
528
529 // Kill all background shells.
530 wg.Go(func() {
531 shell.GetBackgroundShellManager().KillAll()
532 })
533
534 // Shutdown all LSP clients.
535 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
536 defer cancel()
537 for name, client := range app.LSPClients.Seq2() {
538 wg.Go(func() {
539 if err := client.Close(shutdownCtx); err != nil &&
540 !errors.Is(err, io.EOF) &&
541 !errors.Is(err, context.Canceled) &&
542 err.Error() != "signal: killed" {
543 slog.Warn("Failed to shutdown LSP client", "name", name, "error", err)
544 }
545 })
546 }
547
548 // Call all cleanup functions.
549 for _, cleanup := range app.cleanupFuncs {
550 if cleanup != nil {
551 wg.Go(func() {
552 if err := cleanup(); err != nil {
553 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
554 }
555 })
556 }
557 }
558 wg.Wait()
559}
560
561// checkForUpdates checks for available updates.
562func (app *App) checkForUpdates(ctx context.Context) {
563 checkCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
564 defer cancel()
565
566 info, err := update.Check(checkCtx, version.Version, update.Default)
567 if err != nil || !info.Available() {
568 return
569 }
570 app.events <- UpdateAvailableMsg{
571 CurrentVersion: info.Current,
572 LatestVersion: info.Latest,
573 IsDevelopment: info.IsDevelopment(),
574 }
575}