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 session
146 app.Permissions.AutoApproveSession(sess.ID)
147
148 type response struct {
149 result *fantasy.AgentResult
150 err error
151 }
152 done := make(chan response, 1)
153
154 go func(ctx context.Context, sessionID, prompt string) {
155 result, err := app.AgentCoordinator.Run(ctx, sess.ID, prompt)
156 if err != nil {
157 done <- response{
158 err: fmt.Errorf("failed to start agent processing stream: %w", err),
159 }
160 }
161 done <- response{
162 result: result,
163 }
164 }(ctx, sess.ID, prompt)
165
166 messageEvents := app.Messages.Subscribe(ctx)
167 messageReadBytes := make(map[string]int)
168
169 defer func() {
170 _, _ = fmt.Printf(ansi.ResetProgressBar)
171
172 // Always print a newline at the end. If output is a TTY this will
173 // prevent the prompt from overwriting the last line of output.
174 _, _ = fmt.Fprintln(output)
175 }()
176
177 for {
178 // HACK: Reinitialize the terminal progress bar on every iteration so
179 // it doesn't get hidden by the terminal due to inactivity.
180 _, _ = fmt.Printf(ansi.SetIndeterminateProgressBar)
181
182 select {
183 case result := <-done:
184 stopSpinner()
185 if result.err != nil {
186 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
187 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
188 return nil
189 }
190 return fmt.Errorf("agent processing failed: %w", result.err)
191 }
192 return nil
193
194 case event := <-messageEvents:
195 msg := event.Payload
196 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
197 stopSpinner()
198
199 content := msg.Content().String()
200 readBytes := messageReadBytes[msg.ID]
201
202 if len(content) < readBytes {
203 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
204 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
205 }
206
207 part := content[readBytes:]
208 fmt.Fprint(output, part)
209 messageReadBytes[msg.ID] = len(content)
210 }
211
212 case <-ctx.Done():
213 stopSpinner()
214 return ctx.Err()
215 }
216 }
217}
218
219func (app *App) UpdateAgentModel(ctx context.Context) error {
220 return app.AgentCoordinator.UpdateModels(ctx)
221}
222
223func (app *App) setupEvents() {
224 ctx, cancel := context.WithCancel(app.globalCtx)
225 app.eventsCtx = ctx
226 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
227 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
230 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
231 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
232 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
233 cleanupFunc := func() error {
234 cancel()
235 app.serviceEventsWG.Wait()
236 return nil
237 }
238 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
239}
240
241func setupSubscriber[T any](
242 ctx context.Context,
243 wg *sync.WaitGroup,
244 name string,
245 subscriber func(context.Context) <-chan pubsub.Event[T],
246 outputCh chan<- tea.Msg,
247) {
248 wg.Go(func() {
249 subCh := subscriber(ctx)
250 for {
251 select {
252 case event, ok := <-subCh:
253 if !ok {
254 slog.Debug("subscription channel closed", "name", name)
255 return
256 }
257 var msg tea.Msg = event
258 select {
259 case outputCh <- msg:
260 case <-time.After(2 * time.Second):
261 slog.Warn("message dropped due to slow consumer", "name", name)
262 case <-ctx.Done():
263 slog.Debug("subscription cancelled", "name", name)
264 return
265 }
266 case <-ctx.Done():
267 slog.Debug("subscription cancelled", "name", name)
268 return
269 }
270 }
271 })
272}
273
274func (app *App) InitCoderAgent(ctx context.Context) error {
275 coderAgentCfg := app.config.Agents[config.AgentCoder]
276 if coderAgentCfg.ID == "" {
277 return fmt.Errorf("coder agent configuration is missing")
278 }
279 var err error
280 app.AgentCoordinator, err = agent.NewCoordinator(
281 ctx,
282 app.config,
283 app.Sessions,
284 app.Messages,
285 app.Permissions,
286 app.History,
287 app.LSPClients,
288 )
289 if err != nil {
290 slog.Error("Failed to create coder agent", "err", err)
291 return err
292 }
293
294 // Add MCP client cleanup to shutdown process
295 app.cleanupFuncs = append(app.cleanupFuncs, tools.CloseMCPClients)
296 return nil
297}
298
299// Subscribe sends events to the TUI as tea.Msgs.
300func (app *App) Subscribe(program *tea.Program) {
301 defer log.RecoverPanic("app.Subscribe", func() {
302 slog.Info("TUI subscription panic: attempting graceful shutdown")
303 program.Quit()
304 })
305
306 app.tuiWG.Add(1)
307 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
308 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
309 slog.Debug("Cancelling TUI message handler")
310 tuiCancel()
311 app.tuiWG.Wait()
312 return nil
313 })
314 defer app.tuiWG.Done()
315
316 for {
317 select {
318 case <-tuiCtx.Done():
319 slog.Debug("TUI message handler shutting down")
320 return
321 case msg, ok := <-app.events:
322 if !ok {
323 slog.Debug("TUI message channel closed")
324 return
325 }
326 program.Send(msg)
327 }
328 }
329}
330
331// Shutdown performs a graceful shutdown of the application.
332func (app *App) Shutdown() {
333 if app.AgentCoordinator != nil {
334 app.AgentCoordinator.CancelAll()
335 }
336
337 // Shutdown all LSP clients.
338 for name, client := range app.LSPClients.Seq2() {
339 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
340 if err := client.Close(shutdownCtx); err != nil {
341 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
342 }
343 cancel()
344 }
345
346 // Call call cleanup functions.
347 for _, cleanup := range app.cleanupFuncs {
348 if cleanup != nil {
349 if err := cleanup(); err != nil {
350 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
351 }
352 }
353 }
354}