1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "sync"
10 "time"
11
12 "charm.land/fantasy"
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/agent"
15 "github.com/charmbracelet/crush/internal/agent/tools"
16 "github.com/charmbracelet/crush/internal/config"
17 "github.com/charmbracelet/crush/internal/csync"
18 "github.com/charmbracelet/crush/internal/db"
19 "github.com/charmbracelet/crush/internal/format"
20 "github.com/charmbracelet/crush/internal/history"
21 "github.com/charmbracelet/crush/internal/log"
22 "github.com/charmbracelet/crush/internal/lsp"
23 "github.com/charmbracelet/crush/internal/message"
24 "github.com/charmbracelet/crush/internal/permission"
25 "github.com/charmbracelet/crush/internal/pubsub"
26 "github.com/charmbracelet/crush/internal/session"
27 "github.com/charmbracelet/x/ansi"
28)
29
30type App struct {
31 Sessions session.Service
32 Messages message.Service
33 History history.Service
34 Permissions permission.Service
35
36 AgentCoordinator agent.Coordinator
37
38 LSPClients *csync.Map[string, *lsp.Client]
39
40 config *config.Config
41
42 serviceEventsWG *sync.WaitGroup
43 eventsCtx context.Context
44 events chan tea.Msg
45 tuiWG *sync.WaitGroup
46
47 // global context and cleanup functions
48 globalCtx context.Context
49 cleanupFuncs []func() error
50}
51
52// New initializes a new applcation instance.
53func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
54 q := db.New(conn)
55 sessions := session.NewService(q)
56 messages := message.NewService(q)
57 files := history.NewService(q, conn)
58 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
59 allowedTools := []string{}
60 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
61 allowedTools = cfg.Permissions.AllowedTools
62 }
63
64 app := &App{
65 Sessions: sessions,
66 Messages: messages,
67 History: files,
68 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
69 LSPClients: csync.NewMap[string, *lsp.Client](),
70
71 globalCtx: ctx,
72
73 config: cfg,
74
75 events: make(chan tea.Msg, 100),
76 serviceEventsWG: &sync.WaitGroup{},
77 tuiWG: &sync.WaitGroup{},
78 }
79
80 app.setupEvents()
81
82 // Initialize LSP clients in the background.
83 app.initLSPClients(ctx)
84
85 // cleanup database upon app shutdown
86 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
87
88 // TODO: remove the concept of agent config, most likely.
89 if !cfg.IsConfigured() {
90 slog.Warn("No agent configuration found")
91 return app, nil
92 }
93 if err := app.InitCoderAgent(ctx); err != nil {
94 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
95 }
96 return app, nil
97}
98
99// Config returns the application configuration.
100func (app *App) Config() *config.Config {
101 return app.config
102}
103
104// RunNonInteractive runs the application in non-interactive mode with the
105// given prompt, printing to stdout.
106func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
107 slog.Info("Running in non-interactive mode")
108
109 ctx, cancel := context.WithCancel(ctx)
110 defer cancel()
111
112 var spinner *format.Spinner
113 if !quiet {
114 spinner = format.NewSpinner(ctx, cancel, "Generating")
115 spinner.Start()
116 }
117
118 // Helper function to stop spinner once.
119 stopSpinner := func() {
120 if !quiet && spinner != nil {
121 spinner.Stop()
122 spinner = nil
123 }
124 }
125 defer stopSpinner()
126
127 const maxPromptLengthForTitle = 100
128 const titlePrefix = "Non-interactive: "
129 var titleSuffix string
130
131 if len(prompt) > maxPromptLengthForTitle {
132 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
133 } else {
134 titleSuffix = prompt
135 }
136 title := titlePrefix + titleSuffix
137
138 sess, err := app.Sessions.Create(ctx, title)
139 if err != nil {
140 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
141 }
142 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
143
144 // Automatically approve all permission requests for this non-interactive session
145 app.Permissions.AutoApproveSession(sess.ID)
146
147 type response struct {
148 result *fantasy.AgentResult
149 err error
150 }
151 done := make(chan response, 1)
152
153 go func(ctx context.Context, sessionID, prompt string) {
154 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
155 if err != nil {
156 done <- response{
157 err: fmt.Errorf("failed to start agent processing stream: %w", err),
158 }
159 }
160 done <- response{
161 result: result,
162 }
163 }(ctx, sess.ID, prompt)
164
165 messageEvents := app.Messages.Subscribe(ctx)
166 messageReadBytes := make(map[string]int)
167
168 defer func() {
169 _, _ = fmt.Printf(ansi.ResetProgressBar)
170
171 // Always print a newline at the end. If output is a TTY this will
172 // prevent the prompt from overwriting the last line of output.
173 _, _ = fmt.Print('\n')
174 }()
175
176 for {
177 // HACK: Reinitialize the terminal progress bar on every iteration so
178 // it doesn't get hidden by the terminal due to inactivity.
179 _, _ = fmt.Printf(ansi.SetIndeterminateProgressBar)
180
181 select {
182 case result := <-done:
183 stopSpinner()
184 if result.err != nil {
185 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
186 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
187 return nil
188 }
189 return fmt.Errorf("agent processing failed: %w", result.err)
190 }
191 return nil
192
193 case event := <-messageEvents:
194 msg := event.Payload
195 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
196 stopSpinner()
197
198 content := msg.Content().String()
199 readBytes := messageReadBytes[msg.ID]
200
201 if len(content) < readBytes {
202 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
203 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
204 }
205
206 part := content[readBytes:]
207 fmt.Print(part)
208 messageReadBytes[msg.ID] = len(content)
209 }
210
211 case <-ctx.Done():
212 stopSpinner()
213 return ctx.Err()
214 }
215 }
216}
217
218func (app *App) UpdateAgentModel(ctx context.Context) error {
219 return app.AgentCoordinator.UpdateModels(ctx)
220}
221
222func (app *App) setupEvents() {
223 ctx, cancel := context.WithCancel(app.globalCtx)
224 app.eventsCtx = ctx
225 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
226 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
227 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
230 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
231 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
232 cleanupFunc := func() error {
233 cancel()
234 app.serviceEventsWG.Wait()
235 return nil
236 }
237 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
238}
239
240func setupSubscriber[T any](
241 ctx context.Context,
242 wg *sync.WaitGroup,
243 name string,
244 subscriber func(context.Context) <-chan pubsub.Event[T],
245 outputCh chan<- tea.Msg,
246) {
247 wg.Go(func() {
248 subCh := subscriber(ctx)
249 for {
250 select {
251 case event, ok := <-subCh:
252 if !ok {
253 slog.Debug("subscription channel closed", "name", name)
254 return
255 }
256 var msg tea.Msg = event
257 select {
258 case outputCh <- msg:
259 case <-time.After(2 * time.Second):
260 slog.Warn("message dropped due to slow consumer", "name", name)
261 case <-ctx.Done():
262 slog.Debug("subscription cancelled", "name", name)
263 return
264 }
265 case <-ctx.Done():
266 slog.Debug("subscription cancelled", "name", name)
267 return
268 }
269 }
270 })
271}
272
273func (app *App) InitCoderAgent(ctx context.Context) error {
274 coderAgentCfg := app.config.Agents[config.AgentCoder]
275 if coderAgentCfg.ID == "" {
276 return fmt.Errorf("coder agent configuration is missing")
277 }
278 var err error
279 app.AgentCoordinator, err = agent.NewCoordinator(
280 ctx,
281 app.config,
282 app.Sessions,
283 app.Messages,
284 app.Permissions,
285 app.History,
286 app.LSPClients,
287 )
288 if err != nil {
289 slog.Error("Failed to create coder agent", "err", err)
290 return err
291 }
292
293 // Add MCP client cleanup to shutdown process
294 app.cleanupFuncs = append(app.cleanupFuncs, tools.CloseMCPClients)
295 return nil
296}
297
298// Subscribe sends events to the TUI as tea.Msgs.
299func (app *App) Subscribe(program *tea.Program) {
300 defer log.RecoverPanic("app.Subscribe", func() {
301 slog.Info("TUI subscription panic: attempting graceful shutdown")
302 program.Quit()
303 })
304
305 app.tuiWG.Add(1)
306 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
307 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
308 slog.Debug("Cancelling TUI message handler")
309 tuiCancel()
310 app.tuiWG.Wait()
311 return nil
312 })
313 defer app.tuiWG.Done()
314
315 for {
316 select {
317 case <-tuiCtx.Done():
318 slog.Debug("TUI message handler shutting down")
319 return
320 case msg, ok := <-app.events:
321 if !ok {
322 slog.Debug("TUI message channel closed")
323 return
324 }
325 program.Send(msg)
326 }
327 }
328}
329
330// Shutdown performs a graceful shutdown of the application.
331func (app *App) Shutdown() {
332 if app.AgentCoordinator != nil {
333 app.AgentCoordinator.CancelAll()
334 }
335
336 // Shutdown all LSP clients.
337 for name, client := range app.LSPClients.Seq2() {
338 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
339 if err := client.Close(shutdownCtx); err != nil {
340 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
341 }
342 cancel()
343 }
344
345 // Call call cleanup functions.
346 for _, cleanup := range app.cleanupFuncs {
347 if cleanup != nil {
348 if err := cleanup(); err != nil {
349 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
350 }
351 }
352 }
353}