1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "io"
9 "log/slog"
10 "sync"
11 "time"
12
13 "charm.land/fantasy"
14 tea "github.com/charmbracelet/bubbletea/v2"
15 "github.com/charmbracelet/crush/internal/agent"
16 "github.com/charmbracelet/crush/internal/agent/tools"
17 "github.com/charmbracelet/crush/internal/config"
18 "github.com/charmbracelet/crush/internal/csync"
19 "github.com/charmbracelet/crush/internal/db"
20 "github.com/charmbracelet/crush/internal/format"
21 "github.com/charmbracelet/crush/internal/history"
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
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
72 globalCtx: ctx,
73
74 config: cfg,
75
76 events: make(chan tea.Msg, 100),
77 serviceEventsWG: &sync.WaitGroup{},
78 tuiWG: &sync.WaitGroup{},
79 }
80
81 app.setupEvents()
82
83 // Initialize LSP clients in the background.
84 app.initLSPClients(ctx)
85
86 // cleanup database upon app shutdown
87 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
88
89 // TODO: remove the concept of agent config, most likely.
90 if !cfg.IsConfigured() {
91 slog.Warn("No agent configuration found")
92 return app, nil
93 }
94 if err := app.InitCoderAgent(ctx); err != nil {
95 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
96 }
97 return app, nil
98}
99
100// Config returns the application configuration.
101func (app *App) Config() *config.Config {
102 return app.config
103}
104
105// RunNonInteractive runs the application in non-interactive mode with the
106// given prompt, printing to stdout.
107func (app *App) RunNonInteractive(ctx context.Context, output io.Writer, prompt string, quiet bool) error {
108 slog.Info("Running in non-interactive mode")
109
110 ctx, cancel := context.WithCancel(ctx)
111 defer cancel()
112
113 var spinner *format.Spinner
114 if !quiet {
115 spinner = format.NewSpinner(ctx, cancel, "Generating")
116 spinner.Start()
117 }
118
119 // Helper function to stop spinner once.
120 stopSpinner := func() {
121 if !quiet && spinner != nil {
122 spinner.Stop()
123 spinner = nil
124 }
125 }
126 defer stopSpinner()
127
128 const maxPromptLengthForTitle = 100
129 const titlePrefix = "Non-interactive: "
130 var titleSuffix string
131
132 if len(prompt) > maxPromptLengthForTitle {
133 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
134 } else {
135 titleSuffix = prompt
136 }
137 title := titlePrefix + titleSuffix
138
139 sess, err := app.Sessions.Create(ctx, title)
140 if err != nil {
141 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
142 }
143 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
144
145 // Automatically approve all permission requests for this non-interactive
146 // session.
147 app.Permissions.AutoApproveSession(sess.ID)
148
149 type response struct {
150 result *fantasy.AgentResult
151 err error
152 }
153 done := make(chan response, 1)
154
155 go func(ctx context.Context, sessionID, prompt string) {
156 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
157 if err != nil {
158 done <- response{
159 err: fmt.Errorf("failed to start agent processing stream: %w", err),
160 }
161 }
162 done <- response{
163 result: result,
164 }
165 }(ctx, sess.ID, prompt)
166
167 messageEvents := app.Messages.Subscribe(ctx)
168 messageReadBytes := make(map[string]int)
169
170 defer func() {
171 _, _ = fmt.Printf(ansi.ResetProgressBar)
172
173 // Always print a newline at the end. If output is a TTY this will
174 // prevent the prompt from overwriting the last line of output.
175 _, _ = fmt.Fprintln(output)
176 }()
177
178 for {
179 // HACK: Reinitialize the terminal progress bar on every iteration so
180 // it doesn't get hidden by the terminal due to inactivity.
181 _, _ = fmt.Printf(ansi.SetIndeterminateProgressBar)
182
183 select {
184 case result := <-done:
185 stopSpinner()
186 if result.err != nil {
187 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
188 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
189 return nil
190 }
191 return fmt.Errorf("agent processing failed: %w", result.err)
192 }
193 return nil
194
195 case event := <-messageEvents:
196 msg := event.Payload
197 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
198 stopSpinner()
199
200 content := msg.Content().String()
201 readBytes := messageReadBytes[msg.ID]
202
203 if len(content) < readBytes {
204 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
205 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
206 }
207
208 part := content[readBytes:]
209 fmt.Fprint(output, part)
210 messageReadBytes[msg.ID] = len(content)
211 }
212
213 case <-ctx.Done():
214 stopSpinner()
215 return ctx.Err()
216 }
217 }
218}
219
220func (app *App) UpdateAgentModel(ctx context.Context) error {
221 return app.AgentCoordinator.UpdateModels(ctx)
222}
223
224func (app *App) setupEvents() {
225 ctx, cancel := context.WithCancel(app.globalCtx)
226 app.eventsCtx = ctx
227 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
230 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
231 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
232 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
233 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
234 cleanupFunc := func() error {
235 cancel()
236 app.serviceEventsWG.Wait()
237 return nil
238 }
239 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
240}
241
242func setupSubscriber[T any](
243 ctx context.Context,
244 wg *sync.WaitGroup,
245 name string,
246 subscriber func(context.Context) <-chan pubsub.Event[T],
247 outputCh chan<- tea.Msg,
248) {
249 wg.Go(func() {
250 subCh := subscriber(ctx)
251 for {
252 select {
253 case event, ok := <-subCh:
254 if !ok {
255 slog.Debug("subscription channel closed", "name", name)
256 return
257 }
258 var msg tea.Msg = event
259 select {
260 case outputCh <- msg:
261 case <-time.After(2 * time.Second):
262 slog.Warn("message dropped due to slow consumer", "name", name)
263 case <-ctx.Done():
264 slog.Debug("subscription cancelled", "name", name)
265 return
266 }
267 case <-ctx.Done():
268 slog.Debug("subscription cancelled", "name", name)
269 return
270 }
271 }
272 })
273}
274
275func (app *App) InitCoderAgent(ctx context.Context) error {
276 coderAgentCfg := app.config.Agents[config.AgentCoder]
277 if coderAgentCfg.ID == "" {
278 return fmt.Errorf("coder agent configuration is missing")
279 }
280 var err error
281 app.AgentCoordinator, err = agent.NewCoordinator(
282 ctx,
283 app.config,
284 app.Sessions,
285 app.Messages,
286 app.Permissions,
287 app.History,
288 app.LSPClients,
289 )
290 if err != nil {
291 slog.Error("Failed to create coder agent", "err", err)
292 return err
293 }
294
295 // Add MCP client cleanup to shutdown process
296 app.cleanupFuncs = append(app.cleanupFuncs, tools.CloseMCPClients)
297 return nil
298}
299
300// Subscribe sends events to the TUI as tea.Msgs.
301func (app *App) Subscribe(program *tea.Program) {
302 defer log.RecoverPanic("app.Subscribe", func() {
303 slog.Info("TUI subscription panic: attempting graceful shutdown")
304 program.Quit()
305 })
306
307 app.tuiWG.Add(1)
308 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
309 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
310 slog.Debug("Cancelling TUI message handler")
311 tuiCancel()
312 app.tuiWG.Wait()
313 return nil
314 })
315 defer app.tuiWG.Done()
316
317 for {
318 select {
319 case <-tuiCtx.Done():
320 slog.Debug("TUI message handler shutting down")
321 return
322 case msg, ok := <-app.events:
323 if !ok {
324 slog.Debug("TUI message channel closed")
325 return
326 }
327 program.Send(msg)
328 }
329 }
330}
331
332// Shutdown performs a graceful shutdown of the application.
333func (app *App) Shutdown() {
334 if app.AgentCoordinator != nil {
335 app.AgentCoordinator.CancelAll()
336 }
337
338 // Shutdown all LSP clients.
339 for name, client := range app.LSPClients.Seq2() {
340 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
341 if err := client.Close(shutdownCtx); err != nil {
342 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
343 }
344 cancel()
345 }
346
347 // Call call cleanup functions.
348 for _, cleanup := range app.cleanupFuncs {
349 if cleanup != nil {
350 if err := cleanup(); err != nil {
351 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
352 }
353 }
354 }
355}