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/csync"
16 "github.com/charmbracelet/crush/internal/db"
17 "github.com/charmbracelet/crush/internal/format"
18 "github.com/charmbracelet/crush/internal/history"
19 "github.com/charmbracelet/crush/internal/llm/agent"
20 "github.com/charmbracelet/crush/internal/log"
21 "github.com/charmbracelet/crush/internal/pubsub"
22
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/session"
27)
28
29type App struct {
30 Sessions session.Service
31 Messages message.Service
32 History history.Service
33 Permissions permission.Service
34
35 CoderAgent agent.Service
36
37 LSPClients map[string]*lsp.Client
38
39 clientsMutex sync.RWMutex
40
41 watcherCancelFuncs *csync.Slice[context.CancelFunc]
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 watcherCancelFuncs: csync.NewSlice[context.CancelFunc](),
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 // TODO: remove the concept of agent config, most likely.
92 if cfg.IsConfigured() {
93 if err := app.InitCoderAgent(); err != nil {
94 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
95 }
96 } else {
97 slog.Warn("No agent configuration found")
98 }
99 return app, nil
100}
101
102// Config returns the application configuration.
103func (app *App) Config() *config.Config {
104 return app.config
105}
106
107// RunNonInteractive handles the execution flow when a prompt is provided via
108// CLI flag.
109func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
110 slog.Info("Running in non-interactive mode")
111
112 ctx, cancel := context.WithCancel(ctx)
113 defer cancel()
114
115 // Start spinner if not in quiet mode.
116 var spinner *format.Spinner
117 if !quiet {
118 spinner = format.NewSpinner(ctx, cancel, "Generating")
119 spinner.Start()
120 }
121
122 // Helper function to stop spinner once.
123 stopSpinner := func() {
124 if !quiet && spinner != nil {
125 spinner.Stop()
126 spinner = nil
127 }
128 }
129 defer stopSpinner()
130
131 const maxPromptLengthForTitle = 100
132 titlePrefix := "Non-interactive: "
133 var titleSuffix string
134
135 if len(prompt) > maxPromptLengthForTitle {
136 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
137 } else {
138 titleSuffix = prompt
139 }
140 title := titlePrefix + titleSuffix
141
142 sess, err := app.Sessions.Create(ctx, title)
143 if err != nil {
144 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
145 }
146 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
147
148 // Automatically approve all permission requests for this non-interactive session
149 app.Permissions.AutoApproveSession(sess.ID)
150
151 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
152 if err != nil {
153 return fmt.Errorf("failed to start agent processing stream: %w", err)
154 }
155
156 messageEvents := app.Messages.Subscribe(ctx)
157 readBts := 0
158
159 for {
160 select {
161 case result := <-done:
162 stopSpinner()
163
164 if result.Error != nil {
165 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
166 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
167 return nil
168 }
169 return fmt.Errorf("agent processing failed: %w", result.Error)
170 }
171
172 msgContent := result.Message.Content().String()
173 if len(msgContent) < readBts {
174 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
175 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
176 }
177 fmt.Println(msgContent[readBts:])
178
179 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
180 return nil
181
182 case event := <-messageEvents:
183 msg := event.Payload
184 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
185 stopSpinner()
186 part := msg.Content().String()[readBts:]
187 fmt.Print(part)
188 readBts += len(part)
189 }
190
191 case <-ctx.Done():
192 stopSpinner()
193 return ctx.Err()
194 }
195 }
196}
197
198func (app *App) UpdateAgentModel() error {
199 return app.CoderAgent.UpdateModel()
200}
201
202func (app *App) setupEvents() {
203 ctx, cancel := context.WithCancel(app.globalCtx)
204 app.eventsCtx = ctx
205 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
206 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
207 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
208 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
209 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
210 cleanupFunc := func() {
211 cancel()
212 app.serviceEventsWG.Wait()
213 }
214 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
215}
216
217func setupSubscriber[T any](
218 ctx context.Context,
219 wg *sync.WaitGroup,
220 name string,
221 subscriber func(context.Context) <-chan pubsub.Event[T],
222 outputCh chan<- tea.Msg,
223) {
224 wg.Add(1)
225 go func() {
226 defer wg.Done()
227 subCh := subscriber(ctx)
228 for {
229 select {
230 case event, ok := <-subCh:
231 if !ok {
232 slog.Debug("subscription channel closed", "name", name)
233 return
234 }
235 var msg tea.Msg = event
236 select {
237 case outputCh <- msg:
238 case <-time.After(2 * time.Second):
239 slog.Warn("message dropped due to slow consumer", "name", name)
240 case <-ctx.Done():
241 slog.Debug("subscription cancelled", "name", name)
242 return
243 }
244 case <-ctx.Done():
245 slog.Debug("subscription cancelled", "name", name)
246 return
247 }
248 }
249 }()
250}
251
252func (app *App) InitCoderAgent() error {
253 coderAgentCfg := app.config.Agents["coder"]
254 if coderAgentCfg.ID == "" {
255 return fmt.Errorf("coder agent configuration is missing")
256 }
257 var err error
258 app.CoderAgent, err = agent.NewAgent(
259 app.globalCtx,
260 coderAgentCfg,
261 app.Permissions,
262 app.Sessions,
263 app.Messages,
264 app.History,
265 app.LSPClients,
266 )
267 if err != nil {
268 slog.Error("Failed to create coder agent", "err", err)
269 return err
270 }
271 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
272 return nil
273}
274
275// Subscribe sends events to the TUI as tea.Msgs.
276func (app *App) Subscribe(program *tea.Program) {
277 defer log.RecoverPanic("app.Subscribe", func() {
278 slog.Info("TUI subscription panic: attempting graceful shutdown")
279 program.Quit()
280 })
281
282 app.tuiWG.Add(1)
283 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
284 app.cleanupFuncs = append(app.cleanupFuncs, func() {
285 slog.Debug("Cancelling TUI message handler")
286 tuiCancel()
287 app.tuiWG.Wait()
288 })
289 defer app.tuiWG.Done()
290
291 for {
292 select {
293 case <-tuiCtx.Done():
294 slog.Debug("TUI message handler shutting down")
295 return
296 case msg, ok := <-app.events:
297 if !ok {
298 slog.Debug("TUI message channel closed")
299 return
300 }
301 program.Send(msg)
302 }
303 }
304}
305
306// Shutdown performs a graceful shutdown of the application.
307func (app *App) Shutdown() {
308 if app.CoderAgent != nil {
309 app.CoderAgent.CancelAll()
310 }
311
312 for cancel := range app.watcherCancelFuncs.Seq() {
313 cancel()
314 }
315
316 // Wait for all LSP watchers to finish.
317 app.lspWatcherWG.Wait()
318
319 // Get all LSP clients.
320 app.clientsMutex.RLock()
321 clients := make(map[string]*lsp.Client, len(app.LSPClients))
322 maps.Copy(clients, app.LSPClients)
323 app.clientsMutex.RUnlock()
324
325 // Shutdown all LSP clients.
326 for name, client := range clients {
327 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
328 if err := client.Shutdown(shutdownCtx); err != nil {
329 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
330 }
331 cancel()
332 }
333
334 // Call call cleanup functions.
335 for _, cleanup := range app.cleanupFuncs {
336 if cleanup != nil {
337 cleanup()
338 }
339 }
340}