1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "maps"
10 "sync"
11 "time"
12
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/config"
15 "github.com/charmbracelet/crush/internal/csync"
16 "github.com/charmbracelet/crush/internal/db"
17 "github.com/charmbracelet/crush/internal/format"
18 "github.com/charmbracelet/crush/internal/history"
19 "github.com/charmbracelet/crush/internal/llm/agent"
20 "github.com/charmbracelet/crush/internal/log"
21 "github.com/charmbracelet/crush/internal/pubsub"
22
23 "github.com/charmbracelet/crush/internal/lsp"
24 "github.com/charmbracelet/crush/internal/message"
25 "github.com/charmbracelet/crush/internal/permission"
26 "github.com/charmbracelet/crush/internal/session"
27)
28
29type App struct {
30 Sessions session.Service
31 Messages message.Service
32 History history.Service
33 Permissions permission.Service
34
35 CoderAgent agent.Service
36
37 LSPClients map[string]*lsp.Client
38
39 clientsMutex sync.RWMutex
40
41 watcherCancelFuncs *csync.Slice[context.CancelFunc]
42 lspWatcherWG sync.WaitGroup
43
44 config *config.Config
45
46 serviceEventsWG *sync.WaitGroup
47 eventsCtx context.Context
48 events chan tea.Msg
49 tuiWG *sync.WaitGroup
50
51 // global context and cleanup functions
52 globalCtx context.Context
53 cleanupFuncs []func()
54}
55
56// New initializes a new applcation instance.
57func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
58 q := db.New(conn)
59 sessions := session.NewService(q)
60 messages := message.NewService(q)
61 files := history.NewService(q, conn)
62 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
63 allowedTools := []string{}
64 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
65 allowedTools = cfg.Permissions.AllowedTools
66 }
67
68 app := &App{
69 Sessions: sessions,
70 Messages: messages,
71 History: files,
72 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
73 LSPClients: make(map[string]*lsp.Client),
74
75 globalCtx: ctx,
76
77 config: cfg,
78
79 watcherCancelFuncs: csync.NewSlice[context.CancelFunc](),
80
81 events: make(chan tea.Msg, 100),
82 serviceEventsWG: &sync.WaitGroup{},
83 tuiWG: &sync.WaitGroup{},
84 }
85
86 app.setupEvents()
87
88 // Initialize LSP clients in the background.
89 app.initLSPClients(ctx)
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// Config returns the application configuration.
103func (app *App) Config() *config.Config {
104 return app.config
105}
106
107// RunNonInteractive handles the execution flow when a prompt is provided via
108// CLI flag.
109func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
110 slog.Info("Running in non-interactive mode")
111
112 ctx, cancel := context.WithCancel(ctx)
113 defer cancel()
114
115 // Start spinner if not in quiet mode.
116 var spinner *format.Spinner
117 if !quiet {
118 spinner = format.NewSpinner(ctx, cancel, "Generating")
119 spinner.Start()
120 }
121
122 // Helper function to stop spinner once.
123 stopSpinner := func() {
124 if !quiet && spinner != nil {
125 spinner.Stop()
126 spinner = nil
127 }
128 }
129 defer stopSpinner()
130
131 const maxPromptLengthForTitle = 100
132 titlePrefix := "Non-interactive: "
133 var titleSuffix string
134
135 if len(prompt) > maxPromptLengthForTitle {
136 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
137 } else {
138 titleSuffix = prompt
139 }
140 title := titlePrefix + titleSuffix
141
142 sess, err := app.Sessions.Create(ctx, title)
143 if err != nil {
144 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
145 }
146 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
147
148 // Automatically approve all permission requests for this non-interactive session
149 app.Permissions.AutoApproveSession(sess.ID)
150
151 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
152 if err != nil {
153 return fmt.Errorf("failed to start agent processing stream: %w", err)
154 }
155
156 messageEvents := app.Messages.Subscribe(ctx)
157 messageReadBytes := make(map[string]int)
158
159 for {
160 select {
161 case result := <-done:
162 stopSpinner()
163
164 if result.Error != nil {
165 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
166 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
167 return nil
168 }
169 return fmt.Errorf("agent processing failed: %w", result.Error)
170 }
171
172 msgContent := result.Message.Content().String()
173 readBts := messageReadBytes[result.Message.ID]
174
175 if len(msgContent) < readBts {
176 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
177 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
178 }
179 fmt.Println(msgContent[readBts:])
180 messageReadBytes[result.Message.ID] = len(msgContent)
181
182 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
183 return nil
184
185 case event := <-messageEvents:
186 msg := event.Payload
187 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
188 stopSpinner()
189
190 content := msg.Content().String()
191 readBytes := messageReadBytes[msg.ID]
192
193 if len(content) < readBytes {
194 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
195 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
196 }
197
198 part := content[readBytes:]
199 fmt.Print(part)
200 messageReadBytes[msg.ID] = len(content)
201 }
202
203 case <-ctx.Done():
204 stopSpinner()
205 return ctx.Err()
206 }
207 }
208}
209
210func (app *App) UpdateAgentModel() error {
211 return app.CoderAgent.UpdateModel()
212}
213
214func (app *App) setupEvents() {
215 ctx, cancel := context.WithCancel(app.globalCtx)
216 app.eventsCtx = ctx
217 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
218 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
223 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
224 cleanupFunc := func() {
225 cancel()
226 app.serviceEventsWG.Wait()
227 }
228 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
229}
230
231func setupSubscriber[T any](
232 ctx context.Context,
233 wg *sync.WaitGroup,
234 name string,
235 subscriber func(context.Context) <-chan pubsub.Event[T],
236 outputCh chan<- tea.Msg,
237) {
238 wg.Go(func() {
239 subCh := subscriber(ctx)
240 for {
241 select {
242 case event, ok := <-subCh:
243 if !ok {
244 slog.Debug("subscription channel closed", "name", name)
245 return
246 }
247 var msg tea.Msg = event
248 select {
249 case outputCh <- msg:
250 case <-time.After(2 * time.Second):
251 slog.Warn("message dropped due to slow consumer", "name", name)
252 case <-ctx.Done():
253 slog.Debug("subscription cancelled", "name", name)
254 return
255 }
256 case <-ctx.Done():
257 slog.Debug("subscription cancelled", "name", name)
258 return
259 }
260 }
261 })
262}
263
264func (app *App) InitCoderAgent() error {
265 coderAgentCfg := app.config.Agents["coder"]
266 if coderAgentCfg.ID == "" {
267 return fmt.Errorf("coder agent configuration is missing")
268 }
269 var err error
270 app.CoderAgent, err = agent.NewAgent(
271 app.globalCtx,
272 coderAgentCfg,
273 app.Permissions,
274 app.Sessions,
275 app.Messages,
276 app.History,
277 app.LSPClients,
278 )
279 if err != nil {
280 slog.Error("Failed to create coder agent", "err", err)
281 return err
282 }
283
284 // Add MCP client cleanup to shutdown process
285 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
286
287 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
288 return nil
289}
290
291// Subscribe sends events to the TUI as tea.Msgs.
292func (app *App) Subscribe(program *tea.Program) {
293 defer log.RecoverPanic("app.Subscribe", func() {
294 slog.Info("TUI subscription panic: attempting graceful shutdown")
295 program.Quit()
296 })
297
298 app.tuiWG.Add(1)
299 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
300 app.cleanupFuncs = append(app.cleanupFuncs, func() {
301 slog.Debug("Cancelling TUI message handler")
302 tuiCancel()
303 app.tuiWG.Wait()
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 for cancel := range app.watcherCancelFuncs.Seq() {
329 cancel()
330 }
331
332 // Wait for all LSP watchers to finish.
333 app.lspWatcherWG.Wait()
334
335 // Get all LSP clients.
336 app.clientsMutex.RLock()
337 clients := make(map[string]*lsp.Client, len(app.LSPClients))
338 maps.Copy(clients, app.LSPClients)
339 app.clientsMutex.RUnlock()
340
341 // Shutdown all LSP clients.
342 for name, client := range clients {
343 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
344 if err := client.Shutdown(shutdownCtx); err != nil {
345 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
346 }
347 cancel()
348 }
349
350 // Call call cleanup functions.
351 for _, cleanup := range app.cleanupFuncs {
352 if cleanup != nil {
353 cleanup()
354 }
355 }
356}