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/hooks"
22 "github.com/charmbracelet/crush/internal/log"
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/pubsub"
27 "github.com/charmbracelet/crush/internal/session"
28 "github.com/charmbracelet/x/ansi"
29)
30
31type App struct {
32 Sessions session.Service
33 Messages message.Service
34 History history.Service
35 Permissions permission.Service
36
37 AgentCoordinator agent.Coordinator
38
39 LSPClients *csync.Map[string, *lsp.Client]
40
41 config *config.Config
42 hooks *hooks.Executor
43
44 serviceEventsWG *sync.WaitGroup
45 eventsCtx context.Context
46 events chan tea.Msg
47 tuiWG *sync.WaitGroup
48
49 // global context and cleanup functions
50 globalCtx context.Context
51 cleanupFuncs []func() error
52}
53
54// New initializes a new applcation instance.
55func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
56 q := db.New(conn)
57 sessions := session.NewService(q)
58 messages := message.NewService(q)
59 files := history.NewService(q, conn)
60 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
61 allowedTools := []string{}
62 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
63 allowedTools = cfg.Permissions.AllowedTools
64 }
65
66 // Initialize hooks executor
67 hooksExecutor := hooks.NewExecutor(cfg.Hooks, cfg.WorkingDir())
68
69 app := &App{
70 Sessions: sessions,
71 Messages: messages,
72 History: files,
73 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools, hooksExecutor),
74 LSPClients: csync.NewMap[string, *lsp.Client](),
75
76 globalCtx: ctx,
77
78 config: cfg,
79 hooks: hooksExecutor,
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 // cleanup database upon app shutdown
92 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
93
94 // TODO: remove the concept of agent config, most likely.
95 if !cfg.IsConfigured() {
96 slog.Warn("No agent configuration found")
97 return app, nil
98 }
99 if err := app.InitCoderAgent(ctx); err != nil {
100 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
101 }
102 return app, nil
103}
104
105// Config returns the application configuration.
106func (app *App) Config() *config.Config {
107 return app.config
108}
109
110// RunNonInteractive handles the execution flow when a prompt is provided via
111// CLI flag.
112func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
113 slog.Info("Running in non-interactive mode")
114
115 ctx, cancel := context.WithCancel(ctx)
116 defer cancel()
117
118 var spinner *format.Spinner
119 if !quiet {
120 spinner = format.NewSpinner(ctx, cancel, "Generating")
121 spinner.Start()
122 }
123
124 // Helper function to stop spinner once.
125 stopSpinner := func() {
126 if !quiet && spinner != nil {
127 spinner.Stop()
128 spinner = nil
129 }
130 }
131 defer stopSpinner()
132
133 const maxPromptLengthForTitle = 100
134 titlePrefix := "Non-interactive: "
135 var titleSuffix string
136
137 if len(prompt) > maxPromptLengthForTitle {
138 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
139 } else {
140 titleSuffix = prompt
141 }
142 title := titlePrefix + titleSuffix
143
144 sess, err := app.Sessions.Create(ctx, title)
145 if err != nil {
146 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
147 }
148 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
149
150 // Automatically approve all permission requests for this non-interactive session
151 app.Permissions.AutoApproveSession(sess.ID)
152
153 type response struct {
154 result *fantasy.AgentResult
155 err error
156 }
157 done := make(chan response, 1)
158
159 go func(ctx context.Context, sessionID, prompt string) {
160 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
161 if err != nil {
162 done <- response{
163 err: fmt.Errorf("failed to start agent processing stream: %w", err),
164 }
165 }
166 done <- response{
167 result: result,
168 }
169 }(ctx, sess.ID, prompt)
170
171 messageEvents := app.Messages.Subscribe(ctx)
172 messageReadBytes := make(map[string]int)
173
174 defer fmt.Printf(ansi.ResetProgressBar)
175 for {
176 // HACK: add it again on every iteration so it doesn't get hidden by
177 // the terminal due to inactivity.
178 fmt.Printf(ansi.SetIndeterminateProgressBar)
179 select {
180 case result := <-done:
181 stopSpinner()
182 if result.err != nil {
183 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
184 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
185 return nil
186 }
187 return fmt.Errorf("agent processing failed: %w", result.err)
188 }
189 return nil
190
191 case event := <-messageEvents:
192 msg := event.Payload
193 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
194 stopSpinner()
195
196 content := msg.Content().String()
197 readBytes := messageReadBytes[msg.ID]
198
199 if len(content) < readBytes {
200 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
201 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
202 }
203
204 part := content[readBytes:]
205 fmt.Print(part)
206 messageReadBytes[msg.ID] = len(content)
207 }
208
209 case <-ctx.Done():
210 stopSpinner()
211 return ctx.Err()
212 }
213 }
214}
215
216func (app *App) UpdateAgentModel(ctx context.Context) error {
217 return app.AgentCoordinator.UpdateModels(ctx)
218}
219
220func (app *App) setupEvents() {
221 ctx, cancel := context.WithCancel(app.globalCtx)
222 app.eventsCtx = ctx
223 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
224 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
225 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
226 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
227 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
230 cleanupFunc := func() error {
231 cancel()
232 app.serviceEventsWG.Wait()
233 return nil
234 }
235 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
236}
237
238func setupSubscriber[T any](
239 ctx context.Context,
240 wg *sync.WaitGroup,
241 name string,
242 subscriber func(context.Context) <-chan pubsub.Event[T],
243 outputCh chan<- tea.Msg,
244) {
245 wg.Go(func() {
246 subCh := subscriber(ctx)
247 for {
248 select {
249 case event, ok := <-subCh:
250 if !ok {
251 slog.Debug("subscription channel closed", "name", name)
252 return
253 }
254 var msg tea.Msg = event
255 select {
256 case outputCh <- msg:
257 case <-time.After(2 * time.Second):
258 slog.Warn("message dropped due to slow consumer", "name", name)
259 case <-ctx.Done():
260 slog.Debug("subscription cancelled", "name", name)
261 return
262 }
263 case <-ctx.Done():
264 slog.Debug("subscription cancelled", "name", name)
265 return
266 }
267 }
268 })
269}
270
271func (app *App) InitCoderAgent(ctx context.Context) error {
272 coderAgentCfg := app.config.Agents[config.AgentCoder]
273 if coderAgentCfg.ID == "" {
274 return fmt.Errorf("coder agent configuration is missing")
275 }
276
277 var err error
278 app.AgentCoordinator, err = agent.NewCoordinator(
279 ctx,
280 app.config,
281 app.Sessions,
282 app.Messages,
283 app.Permissions,
284 app.History,
285 app.LSPClients,
286 app.hooks,
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}