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/lsp"
21 "github.com/charmbracelet/crush/internal/message"
22 "github.com/charmbracelet/crush/internal/permission"
23 "github.com/charmbracelet/crush/internal/pubsub"
24 "github.com/charmbracelet/crush/internal/session"
25 "github.com/charmbracelet/x/ansi"
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 config *config.Config
39
40 serviceEventsWG *sync.WaitGroup
41 eventsCtx context.Context
42 events chan tea.Msg
43 tuiWG *sync.WaitGroup
44
45 // global context and cleanup functions
46 globalCtx context.Context
47 cleanupFuncs []func() error
48}
49
50// New initializes a new applcation instance.
51func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
52 q := db.New(conn)
53 sessions := session.NewService(q)
54 messages := message.NewService(q)
55 files := history.NewService(q, conn)
56 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
57 allowedTools := []string{}
58 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
59 allowedTools = cfg.Permissions.AllowedTools
60 }
61
62 app := &App{
63 Sessions: sessions,
64 Messages: messages,
65 History: files,
66 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
67 LSPClients: csync.NewMap[string, *lsp.Client](),
68
69 globalCtx: ctx,
70
71 config: cfg,
72
73 events: make(chan tea.Msg, 100),
74 serviceEventsWG: &sync.WaitGroup{},
75 tuiWG: &sync.WaitGroup{},
76 }
77
78 app.setupEvents()
79
80 // Initialize LSP clients in the background.
81 app.initLSPClients(ctx)
82
83 // cleanup database upon app shutdown
84 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
85
86 // TODO: remove the concept of agent config, most likely.
87 if cfg.IsConfigured() {
88 if err := app.InitCoderAgent(); err != nil {
89 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
90 }
91 } else {
92 slog.Warn("No agent configuration found")
93 }
94 return app, nil
95}
96
97// Config returns the application configuration.
98func (app *App) Config() *config.Config {
99 return app.config
100}
101
102// RunNonInteractive handles the execution flow when a prompt is provided via
103// CLI flag.
104func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
105 slog.Info("Running in non-interactive mode")
106
107 ctx, cancel := context.WithCancel(ctx)
108 defer cancel()
109
110 // Start progress bar and spinner
111 fmt.Printf(ansi.SetIndeterminateProgressBar)
112 defer fmt.Printf(ansi.ResetProgressBar)
113
114 var spinner *format.Spinner
115 if !quiet {
116 spinner = format.NewSpinner(ctx, cancel, "Generating")
117 spinner.Start()
118 }
119
120 // Helper function to stop spinner once.
121 stopSpinner := func() {
122 if !quiet && spinner != nil {
123 spinner.Stop()
124 spinner = nil
125 }
126 }
127 defer stopSpinner()
128
129 const maxPromptLengthForTitle = 100
130 titlePrefix := "Non-interactive: "
131 var titleSuffix string
132
133 if len(prompt) > maxPromptLengthForTitle {
134 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
135 } else {
136 titleSuffix = prompt
137 }
138 title := titlePrefix + titleSuffix
139
140 sess, err := app.Sessions.Create(ctx, title)
141 if err != nil {
142 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
143 }
144 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
145
146 // Automatically approve all permission requests for this non-interactive session
147 app.Permissions.AutoApproveSession(sess.ID)
148
149 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
150 if err != nil {
151 return fmt.Errorf("failed to start agent processing stream: %w", err)
152 }
153
154 messageEvents := app.Messages.Subscribe(ctx)
155 messageReadBytes := make(map[string]int)
156
157 for {
158 select {
159 case result := <-done:
160 stopSpinner()
161
162 if result.Error != nil {
163 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
164 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
165 return nil
166 }
167 return fmt.Errorf("agent processing failed: %w", result.Error)
168 }
169
170 msgContent := result.Message.Content().String()
171 readBts := messageReadBytes[result.Message.ID]
172
173 if len(msgContent) < readBts {
174 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
175 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
176 }
177 fmt.Println(msgContent[readBts:])
178 messageReadBytes[result.Message.ID] = len(msgContent)
179
180 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
181 return nil
182
183 case event := <-messageEvents:
184 msg := event.Payload
185 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
186 stopSpinner()
187
188 content := msg.Content().String()
189 readBytes := messageReadBytes[msg.ID]
190
191 if len(content) < readBytes {
192 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
193 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
194 }
195
196 part := content[readBytes:]
197 fmt.Print(part)
198 messageReadBytes[msg.ID] = len(content)
199 }
200
201 case <-ctx.Done():
202 stopSpinner()
203 return ctx.Err()
204 }
205 }
206}
207
208func (app *App) UpdateAgentModel() error {
209 return app.CoderAgent.UpdateModel()
210}
211
212func (app *App) setupEvents() {
213 ctx, cancel := context.WithCancel(app.globalCtx)
214 app.eventsCtx = ctx
215 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
216 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
217 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
222 cleanupFunc := func() error {
223 cancel()
224 app.serviceEventsWG.Wait()
225 return nil
226 }
227 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
228}
229
230func setupSubscriber[T any](
231 ctx context.Context,
232 wg *sync.WaitGroup,
233 name string,
234 subscriber func(context.Context) <-chan pubsub.Event[T],
235 outputCh chan<- tea.Msg,
236) {
237 wg.Go(func() {
238 subCh := subscriber(ctx)
239 for {
240 select {
241 case event, ok := <-subCh:
242 if !ok {
243 slog.Debug("subscription channel closed", "name", name)
244 return
245 }
246 var msg tea.Msg = event
247 select {
248 case outputCh <- msg:
249 case <-time.After(2 * time.Second):
250 slog.Warn("message dropped due to slow consumer", "name", name)
251 case <-ctx.Done():
252 slog.Debug("subscription cancelled", "name", name)
253 return
254 }
255 case <-ctx.Done():
256 slog.Debug("subscription cancelled", "name", name)
257 return
258 }
259 }
260 })
261}
262
263func (app *App) InitCoderAgent() error {
264 coderAgentCfg := app.config.Agents["coder"]
265 if coderAgentCfg.ID == "" {
266 return fmt.Errorf("coder agent configuration is missing")
267 }
268 var err error
269 app.CoderAgent, err = agent.NewAgent(
270 app.globalCtx,
271 coderAgentCfg,
272 app.Permissions,
273 app.Sessions,
274 app.Messages,
275 app.History,
276 app.LSPClients,
277 )
278 if err != nil {
279 slog.Error("Failed to create coder agent", "err", err)
280 return err
281 }
282
283 // Add MCP client cleanup to shutdown process
284 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
285
286 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
287 return nil
288}
289
290// Subscribe sends events to the TUI as tea.Msgs.
291func (app *App) Subscribe(program *tea.Program) {
292 defer log.RecoverPanic("app.Subscribe", func() {
293 slog.Info("TUI subscription panic: attempting graceful shutdown")
294 program.Quit()
295 })
296
297 app.tuiWG.Add(1)
298 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
299 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
300 slog.Debug("Cancelling TUI message handler")
301 tuiCancel()
302 app.tuiWG.Wait()
303 return nil
304 })
305 defer app.tuiWG.Done()
306
307 for {
308 select {
309 case <-tuiCtx.Done():
310 slog.Debug("TUI message handler shutting down")
311 return
312 case msg, ok := <-app.events:
313 if !ok {
314 slog.Debug("TUI message channel closed")
315 return
316 }
317 program.Send(msg)
318 }
319 }
320}
321
322// Shutdown performs a graceful shutdown of the application.
323func (app *App) Shutdown() {
324 if app.CoderAgent != nil {
325 app.CoderAgent.CancelAll()
326 }
327
328 // Shutdown all LSP clients.
329 for name, client := range app.LSPClients.Seq2() {
330 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
331 if err := client.Close(shutdownCtx); err != nil {
332 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
333 }
334 cancel()
335 }
336
337 // Call call cleanup functions.
338 for _, cleanup := range app.cleanupFuncs {
339 if cleanup != nil {
340 if err := cleanup(); err != nil {
341 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
342 }
343 }
344 }
345}