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