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/crush/internal/update"
26 "github.com/charmbracelet/x/ansi"
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 *csync.Map[string, *lsp.Client]
38
39 config *config.Config
40
41 serviceEventsWG *sync.WaitGroup
42 eventsCtx context.Context
43 events chan tea.Msg
44 tuiWG *sync.WaitGroup
45
46 // global context and cleanup functions
47 globalCtx context.Context
48 cleanupFuncs []func() error
49}
50
51// New initializes a new applcation instance.
52func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
53 q := db.New(conn)
54 sessions := session.NewService(q)
55 messages := message.NewService(q)
56 files := history.NewService(q, conn)
57 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
58 allowedTools := []string{}
59 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
60 allowedTools = cfg.Permissions.AllowedTools
61 }
62
63 app := &App{
64 Sessions: sessions,
65 Messages: messages,
66 History: files,
67 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
68 LSPClients: csync.NewMap[string, *lsp.Client](),
69
70 globalCtx: ctx,
71
72 config: cfg,
73
74 events: make(chan tea.Msg, 100),
75 serviceEventsWG: &sync.WaitGroup{},
76 tuiWG: &sync.WaitGroup{},
77 }
78
79 app.setupEvents()
80
81 // Initialize LSP clients in the background.
82 app.initLSPClients(ctx)
83
84 // Check for updates in the background.
85 go app.checkForUpdates(ctx)
86
87 // cleanup database upon app shutdown
88 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
89
90 // TODO: remove the concept of agent config, most likely.
91 if cfg.IsConfigured() {
92 if err := app.InitCoderAgent(); err != nil {
93 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
94 }
95 } else {
96 slog.Warn("No agent configuration found")
97 }
98 return app, nil
99}
100
101// Config returns the application configuration.
102func (app *App) Config() *config.Config {
103 return app.config
104}
105
106// RunNonInteractive handles the execution flow when a prompt is provided via
107// CLI flag.
108func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
109 slog.Info("Running in non-interactive mode")
110
111 ctx, cancel := context.WithCancel(ctx)
112 defer cancel()
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 defer fmt.Printf(ansi.ResetProgressBar)
158 for {
159 // HACK: add it again on every iteration so it doesn't get hidden by
160 // the terminal due to inactivity.
161 fmt.Printf(ansi.SetIndeterminateProgressBar)
162 select {
163 case result := <-done:
164 stopSpinner()
165
166 if result.Error != nil {
167 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
168 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
169 return nil
170 }
171 return fmt.Errorf("agent processing failed: %w", result.Error)
172 }
173
174 msgContent := result.Message.Content().String()
175 readBts := messageReadBytes[result.Message.ID]
176
177 if len(msgContent) < readBts {
178 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
179 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
180 }
181 fmt.Println(msgContent[readBts:])
182 messageReadBytes[result.Message.ID] = len(msgContent)
183
184 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
185 return nil
186
187 case event := <-messageEvents:
188 msg := event.Payload
189 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
190 stopSpinner()
191
192 content := msg.Content().String()
193 readBytes := messageReadBytes[msg.ID]
194
195 if len(content) < readBytes {
196 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
197 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
198 }
199
200 part := content[readBytes:]
201 fmt.Print(part)
202 messageReadBytes[msg.ID] = len(content)
203 }
204
205 case <-ctx.Done():
206 stopSpinner()
207 return ctx.Err()
208 }
209 }
210}
211
212func (app *App) UpdateAgentModel() error {
213 return app.CoderAgent.UpdateModel()
214}
215
216func (app *App) setupEvents() {
217 ctx, cancel := context.WithCancel(app.globalCtx)
218 app.eventsCtx = ctx
219 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
223 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
224 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
225 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
226 cleanupFunc := func() error {
227 cancel()
228 app.serviceEventsWG.Wait()
229 return nil
230 }
231 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
232}
233
234func setupSubscriber[T any](
235 ctx context.Context,
236 wg *sync.WaitGroup,
237 name string,
238 subscriber func(context.Context) <-chan pubsub.Event[T],
239 outputCh chan<- tea.Msg,
240) {
241 wg.Go(func() {
242 subCh := subscriber(ctx)
243 for {
244 select {
245 case event, ok := <-subCh:
246 if !ok {
247 slog.Debug("subscription channel closed", "name", name)
248 return
249 }
250 var msg tea.Msg = event
251 select {
252 case outputCh <- msg:
253 case <-time.After(2 * time.Second):
254 slog.Warn("message dropped due to slow consumer", "name", name)
255 case <-ctx.Done():
256 slog.Debug("subscription cancelled", "name", name)
257 return
258 }
259 case <-ctx.Done():
260 slog.Debug("subscription cancelled", "name", name)
261 return
262 }
263 }
264 })
265}
266
267func (app *App) InitCoderAgent() error {
268 coderAgentCfg := app.config.Agents["coder"]
269 if coderAgentCfg.ID == "" {
270 return fmt.Errorf("coder agent configuration is missing")
271 }
272 var err error
273 app.CoderAgent, err = agent.NewAgent(
274 app.globalCtx,
275 coderAgentCfg,
276 app.Permissions,
277 app.Sessions,
278 app.Messages,
279 app.History,
280 app.LSPClients,
281 )
282 if err != nil {
283 slog.Error("Failed to create coder agent", "err", err)
284 return err
285 }
286
287 // Add MCP client cleanup to shutdown process
288 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
289
290 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
291 return nil
292}
293
294// Subscribe sends events to the TUI as tea.Msgs.
295func (app *App) Subscribe(program *tea.Program) {
296 defer log.RecoverPanic("app.Subscribe", func() {
297 slog.Info("TUI subscription panic: attempting graceful shutdown")
298 program.Quit()
299 })
300
301 app.tuiWG.Add(1)
302 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
303 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
304 slog.Debug("Cancelling TUI message handler")
305 tuiCancel()
306 app.tuiWG.Wait()
307 return nil
308 })
309 defer app.tuiWG.Done()
310
311 for {
312 select {
313 case <-tuiCtx.Done():
314 slog.Debug("TUI message handler shutting down")
315 return
316 case msg, ok := <-app.events:
317 if !ok {
318 slog.Debug("TUI message channel closed")
319 return
320 }
321 program.Send(msg)
322 }
323 }
324}
325
326// Shutdown performs a graceful shutdown of the application.
327func (app *App) Shutdown() {
328 if app.CoderAgent != nil {
329 app.CoderAgent.CancelAll()
330 }
331
332 // Shutdown all LSP clients.
333 for name, client := range app.LSPClients.Seq2() {
334 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
335 if err := client.Close(shutdownCtx); err != nil {
336 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
337 }
338 cancel()
339 }
340
341 // Call call cleanup functions.
342 for _, cleanup := range app.cleanupFuncs {
343 if cleanup != nil {
344 if err := cleanup(); err != nil {
345 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
346 }
347 }
348 }
349}
350
351// checkForUpdates checks for available updates.
352func (app *App) checkForUpdates(ctx context.Context) {
353 checkCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
354 defer cancel()
355 info, err := update.Check(checkCtx)
356 if err != nil || info == nil || !info.Available {
357 return
358 }
359 app.events <- pubsub.UpdateAvailableMsg{
360 CurrentVersion: info.CurrentVersion,
361 LatestVersion: info.LatestVersion,
362 }
363}