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/log"
22 "github.com/charmbracelet/crush/internal/lsp"
23 "github.com/charmbracelet/crush/internal/message"
24 "github.com/charmbracelet/crush/internal/permission"
25 "github.com/charmbracelet/crush/internal/pubsub"
26 "github.com/charmbracelet/crush/internal/session"
27 "github.com/charmbracelet/crush/internal/shell"
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 handles the execution flow when a prompt is provided via
106// CLI flag.
107func (app *App) RunNonInteractive(ctx context.Context, 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 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 fmt.Printf(ansi.ResetProgressBar)
170 for {
171 // HACK: add it again on every iteration so it doesn't get hidden by
172 // the terminal due to inactivity.
173 fmt.Printf(ansi.SetIndeterminateProgressBar)
174 select {
175 case result := <-done:
176 stopSpinner()
177 if result.err != nil {
178 if errors.Is(result.err, context.Canceled) || errors.Is(result.err, agent.ErrRequestCancelled) {
179 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
180 return nil
181 }
182 return fmt.Errorf("agent processing failed: %w", result.err)
183 }
184 return nil
185
186 case event := <-messageEvents:
187 msg := event.Payload
188 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
189 stopSpinner()
190
191 content := msg.Content().String()
192 readBytes := messageReadBytes[msg.ID]
193
194 if len(content) < readBytes {
195 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
196 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
197 }
198
199 part := content[readBytes:]
200 fmt.Print(part)
201 messageReadBytes[msg.ID] = len(content)
202 }
203
204 case <-ctx.Done():
205 stopSpinner()
206 return ctx.Err()
207 }
208 }
209}
210
211func (app *App) UpdateAgentModel(ctx context.Context) error {
212 return app.AgentCoordinator.UpdateModels(ctx)
213}
214
215func (app *App) setupEvents() {
216 ctx, cancel := context.WithCancel(app.globalCtx)
217 app.eventsCtx = ctx
218 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
219 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
220 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
223 setupSubscriber(ctx, app.serviceEventsWG, "mcp", tools.SubscribeMCPEvents, app.events)
224 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
225 cleanupFunc := func() error {
226 cancel()
227 app.serviceEventsWG.Wait()
228 return nil
229 }
230 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
231}
232
233func setupSubscriber[T any](
234 ctx context.Context,
235 wg *sync.WaitGroup,
236 name string,
237 subscriber func(context.Context) <-chan pubsub.Event[T],
238 outputCh chan<- tea.Msg,
239) {
240 wg.Go(func() {
241 subCh := subscriber(ctx)
242 for {
243 select {
244 case event, ok := <-subCh:
245 if !ok {
246 slog.Debug("subscription channel closed", "name", name)
247 return
248 }
249 var msg tea.Msg = event
250 select {
251 case outputCh <- msg:
252 case <-time.After(2 * time.Second):
253 slog.Warn("message dropped due to slow consumer", "name", name)
254 case <-ctx.Done():
255 slog.Debug("subscription cancelled", "name", name)
256 return
257 }
258 case <-ctx.Done():
259 slog.Debug("subscription cancelled", "name", name)
260 return
261 }
262 }
263 })
264}
265
266func (app *App) InitCoderAgent(ctx context.Context) error {
267 coderAgentCfg := app.config.Agents[config.AgentCoder]
268 if coderAgentCfg.ID == "" {
269 return fmt.Errorf("coder agent configuration is missing")
270 }
271 var err error
272 app.AgentCoordinator, err = agent.NewCoordinator(
273 ctx,
274 app.config,
275 app.Sessions,
276 app.Messages,
277 app.Permissions,
278 app.History,
279 app.LSPClients,
280 )
281 if err != nil {
282 slog.Error("Failed to create coder agent", "err", err)
283 return err
284 }
285
286 // Add MCP client cleanup to shutdown process
287 app.cleanupFuncs = append(app.cleanupFuncs, tools.CloseMCPClients)
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() error {
301 slog.Debug("Cancelling TUI message handler")
302 tuiCancel()
303 app.tuiWG.Wait()
304 return nil
305 })
306 defer app.tuiWG.Done()
307
308 for {
309 select {
310 case <-tuiCtx.Done():
311 slog.Debug("TUI message handler shutting down")
312 return
313 case msg, ok := <-app.events:
314 if !ok {
315 slog.Debug("TUI message channel closed")
316 return
317 }
318 program.Send(msg)
319 }
320 }
321}
322
323// Shutdown performs a graceful shutdown of the application.
324func (app *App) Shutdown() {
325 if app.AgentCoordinator != nil {
326 app.AgentCoordinator.CancelAll()
327 }
328
329 // Kill all background shells.
330 shell.GetBackgroundShellManager().KillAll()
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}