1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "maps"
10 "sync"
11 "time"
12
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/config"
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/pubsub"
21
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/session"
26)
27
28type App struct {
29 Sessions session.Service
30 Messages message.Service
31 History history.Service
32 Permissions permission.Service
33
34 CoderAgent agent.Service
35
36 LSPClients map[string]*lsp.Client
37
38 clientsMutex sync.RWMutex
39
40 watcherCancelFuncs []context.CancelFunc
41 cancelFuncsMutex sync.Mutex
42 lspWatcherWG sync.WaitGroup
43
44 config *config.Config
45
46 serviceEventsWG *sync.WaitGroup
47 eventsCtx context.Context
48 events chan tea.Msg
49 tuiWG *sync.WaitGroup
50
51 // global context and cleanup functions
52 globalCtx context.Context
53 cleanupFuncs []func()
54}
55
56// New initializes a new applcation instance.
57func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
58 q := db.New(conn)
59 sessions := session.NewService(q)
60 messages := message.NewService(q)
61 files := history.NewService(q, conn)
62 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
63 allowedTools := []string{}
64 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
65 allowedTools = cfg.Permissions.AllowedTools
66 }
67
68 app := &App{
69 Sessions: sessions,
70 Messages: messages,
71 History: files,
72 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
73 LSPClients: make(map[string]*lsp.Client),
74
75 globalCtx: ctx,
76
77 config: cfg,
78
79 events: make(chan tea.Msg, 100),
80 serviceEventsWG: &sync.WaitGroup{},
81 tuiWG: &sync.WaitGroup{},
82 }
83
84 app.setupEvents()
85
86 // Initialize LSP clients in the background.
87 app.initLSPClients(ctx)
88
89 // TODO: remove the concept of agent config, most likely.
90 if cfg.IsConfigured() {
91 if err := app.InitCoderAgent(); err != nil {
92 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
93 }
94 } else {
95 slog.Warn("No agent configuration found")
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 // Start spinner if not in quiet mode.
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 readBts := 0
156
157 for {
158 select {
159 case result := <-done:
160 stopSpinner()
161
162 if result.Error != nil {
163 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
164 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
165 return nil
166 }
167 return fmt.Errorf("agent processing failed: %w", result.Error)
168 }
169
170 msgContent := result.Message.Content().String()
171 if len(msgContent) < readBts {
172 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
173 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
174 }
175 fmt.Println(msgContent[readBts:])
176
177 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
178 return nil
179
180 case event := <-messageEvents:
181 msg := event.Payload
182 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
183 stopSpinner()
184 part := msg.Content().String()[readBts:]
185 fmt.Print(part)
186 readBts += len(part)
187 }
188
189 case <-ctx.Done():
190 stopSpinner()
191 return ctx.Err()
192 }
193 }
194}
195
196func (app *App) UpdateAgentModel() error {
197 return app.CoderAgent.UpdateModel()
198}
199
200func (app *App) setupEvents() {
201 ctx, cancel := context.WithCancel(app.globalCtx)
202 app.eventsCtx = ctx
203 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
204 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
205 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
206 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
207 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
208 cleanupFunc := func() {
209 cancel()
210 app.serviceEventsWG.Wait()
211 }
212 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
213}
214
215func setupSubscriber[T any](
216 ctx context.Context,
217 wg *sync.WaitGroup,
218 name string,
219 subscriber func(context.Context) <-chan pubsub.Event[T],
220 outputCh chan<- tea.Msg,
221) {
222 wg.Add(1)
223 go func() {
224 defer wg.Done()
225 subCh := subscriber(ctx)
226 for {
227 select {
228 case event, ok := <-subCh:
229 if !ok {
230 slog.Debug("subscription channel closed", "name", name)
231 return
232 }
233 var msg tea.Msg = event
234 select {
235 case outputCh <- msg:
236 case <-time.After(2 * time.Second):
237 slog.Warn("message dropped due to slow consumer", "name", name)
238 case <-ctx.Done():
239 slog.Debug("subscription cancelled", "name", name)
240 return
241 }
242 case <-ctx.Done():
243 slog.Debug("subscription cancelled", "name", name)
244 return
245 }
246 }
247 }()
248}
249
250func (app *App) InitCoderAgent() error {
251 coderAgentCfg := app.config.Agents["coder"]
252 if coderAgentCfg.ID == "" {
253 return fmt.Errorf("coder agent configuration is missing")
254 }
255 var err error
256 app.CoderAgent, err = agent.NewAgent(
257 coderAgentCfg,
258 app.Permissions,
259 app.Sessions,
260 app.Messages,
261 app.History,
262 app.LSPClients,
263 )
264 if err != nil {
265 slog.Error("Failed to create coder agent", "err", err)
266 return err
267 }
268 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
269 return nil
270}
271
272// Subscribe sends events to the TUI as tea.Msgs.
273func (app *App) Subscribe(program *tea.Program) {
274 defer log.RecoverPanic("app.Subscribe", func() {
275 slog.Info("TUI subscription panic: attempting graceful shutdown")
276 program.Quit()
277 })
278
279 app.tuiWG.Add(1)
280 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
281 app.cleanupFuncs = append(app.cleanupFuncs, func() {
282 slog.Debug("Cancelling TUI message handler")
283 tuiCancel()
284 app.tuiWG.Wait()
285 })
286 defer app.tuiWG.Done()
287
288 for {
289 select {
290 case <-tuiCtx.Done():
291 slog.Debug("TUI message handler shutting down")
292 return
293 case msg, ok := <-app.events:
294 if !ok {
295 slog.Debug("TUI message channel closed")
296 return
297 }
298 program.Send(msg)
299 }
300 }
301}
302
303// Shutdown performs a graceful shutdown of the application.
304func (app *App) Shutdown() {
305 if app.CoderAgent != nil {
306 app.CoderAgent.CancelAll()
307 }
308
309 app.cancelFuncsMutex.Lock()
310 for _, cancel := range app.watcherCancelFuncs {
311 cancel()
312 }
313 app.cancelFuncsMutex.Unlock()
314
315 // Wait for all LSP watchers to finish.
316 app.lspWatcherWG.Wait()
317
318 // Get all LSP clients.
319 app.clientsMutex.RLock()
320 clients := make(map[string]*lsp.Client, len(app.LSPClients))
321 maps.Copy(clients, app.LSPClients)
322 app.clientsMutex.RUnlock()
323
324 // Shutdown all LSP clients.
325 for name, client := range clients {
326 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
327 if err := client.Shutdown(shutdownCtx); err != nil {
328 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
329 }
330 cancel()
331 }
332
333 // Call call cleanup functions.
334 for _, cleanup := range app.cleanupFuncs {
335 if cleanup != nil {
336 cleanup()
337 }
338 }
339}