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.Options != nil && cfg.Options.SkipPermissionsRequests
63
64 app := &App{
65 Sessions: sessions,
66 Messages: messages,
67 History: files,
68 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests),
69 LSPClients: make(map[string]*lsp.Client),
70
71 globalCtx: ctx,
72
73 config: cfg,
74
75 events: make(chan tea.Msg, 100),
76 serviceEventsWG: &sync.WaitGroup{},
77 tuiWG: &sync.WaitGroup{},
78 }
79
80 app.setupEvents()
81
82 // Initialize LSP clients in the background.
83 go app.initLSPClients(ctx)
84
85 // TODO: remove the concept of agent config, most likely.
86 if cfg.IsConfigured() {
87 if err := app.InitCoderAgent(); err != nil {
88 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
89 }
90 } else {
91 slog.Warn("No agent configuration found")
92 }
93 return app, nil
94}
95
96// Config returns the application configuration.
97func (app *App) Config() *config.Config {
98 return app.config
99}
100
101// RunNonInteractive handles the execution flow when a prompt is provided via
102// CLI flag.
103func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
104 slog.Info("Running in non-interactive mode")
105
106 ctx, cancel := context.WithCancel(ctx)
107 defer cancel()
108
109 // Start spinner if not in quiet mode.
110 var spinner *format.Spinner
111 if !quiet {
112 spinner = format.NewSpinner(ctx, cancel, "Generating")
113 spinner.Start()
114 }
115
116 // Helper function to stop spinner once.
117 stopSpinner := func() {
118 if !quiet && spinner != nil {
119 spinner.Stop()
120 spinner = nil
121 }
122 }
123 defer stopSpinner()
124
125 const maxPromptLengthForTitle = 100
126 titlePrefix := "Non-interactive: "
127 var titleSuffix string
128
129 if len(prompt) > maxPromptLengthForTitle {
130 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
131 } else {
132 titleSuffix = prompt
133 }
134 title := titlePrefix + titleSuffix
135
136 sess, err := app.Sessions.Create(ctx, title)
137 if err != nil {
138 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
139 }
140 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
141
142 // Automatically approve all permission requests for this non-interactive session
143 app.Permissions.AutoApproveSession(sess.ID)
144
145 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
146 if err != nil {
147 return fmt.Errorf("failed to start agent processing stream: %w", err)
148 }
149
150 messageEvents := app.Messages.Subscribe(ctx)
151 readBts := 0
152
153 for {
154 select {
155 case result := <-done:
156 stopSpinner()
157
158 if result.Error != nil {
159 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
160 slog.Info("Agent processing cancelled", "session_id", sess.ID)
161 return nil
162 }
163 return fmt.Errorf("agent processing failed: %w", result.Error)
164 }
165
166 part := result.Message.Content().String()[readBts:]
167 fmt.Println(part)
168
169 slog.Info("Non-interactive run completed", "session_id", sess.ID)
170 return nil
171
172 case event := <-messageEvents:
173 msg := event.Payload
174 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
175 stopSpinner()
176 part := msg.Content().String()[readBts:]
177 fmt.Print(part)
178 readBts += len(part)
179 }
180
181 case <-ctx.Done():
182 stopSpinner()
183 return ctx.Err()
184 }
185 }
186}
187
188func (app *App) UpdateAgentModel() error {
189 return app.CoderAgent.UpdateModel()
190}
191
192func (app *App) setupEvents() {
193 ctx, cancel := context.WithCancel(app.globalCtx)
194 app.eventsCtx = ctx
195 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
196 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
197 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
198 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
199 cleanupFunc := func() {
200 cancel()
201 app.serviceEventsWG.Wait()
202 }
203 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
204}
205
206func setupSubscriber[T any](
207 ctx context.Context,
208 wg *sync.WaitGroup,
209 name string,
210 subscriber func(context.Context) <-chan pubsub.Event[T],
211 outputCh chan<- tea.Msg,
212) {
213 wg.Add(1)
214 go func() {
215 defer wg.Done()
216 subCh := subscriber(ctx)
217 for {
218 select {
219 case event, ok := <-subCh:
220 if !ok {
221 slog.Debug("subscription channel closed", "name", name)
222 return
223 }
224 var msg tea.Msg = event
225 select {
226 case outputCh <- msg:
227 case <-time.After(2 * time.Second):
228 slog.Warn("message dropped due to slow consumer", "name", name)
229 case <-ctx.Done():
230 slog.Debug("subscription cancelled", "name", name)
231 return
232 }
233 case <-ctx.Done():
234 slog.Debug("subscription cancelled", "name", name)
235 return
236 }
237 }
238 }()
239}
240
241func (app *App) InitCoderAgent() error {
242 coderAgentCfg := app.config.Agents["coder"]
243 if coderAgentCfg.ID == "" {
244 return fmt.Errorf("coder agent configuration is missing")
245 }
246 var err error
247 app.CoderAgent, err = agent.NewAgent(
248 coderAgentCfg,
249 app.Permissions,
250 app.Sessions,
251 app.Messages,
252 app.History,
253 app.LSPClients,
254 )
255 if err != nil {
256 slog.Error("Failed to create coder agent", "err", err)
257 return err
258 }
259 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
260 return nil
261}
262
263// Subscribe sends events to the TUI as tea.Msgs.
264func (app *App) Subscribe(program *tea.Program) {
265 defer log.RecoverPanic("app.Subscribe", func() {
266 slog.Info("TUI subscription panic: attempting graceful shutdown")
267 program.Quit()
268 })
269
270 app.tuiWG.Add(1)
271 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
272 app.cleanupFuncs = append(app.cleanupFuncs, func() {
273 slog.Debug("Cancelling TUI message handler")
274 tuiCancel()
275 app.tuiWG.Wait()
276 })
277 defer app.tuiWG.Done()
278
279 for {
280 select {
281 case <-tuiCtx.Done():
282 slog.Debug("TUI message handler shutting down")
283 return
284 case msg, ok := <-app.events:
285 if !ok {
286 slog.Debug("TUI message channel closed")
287 return
288 }
289 program.Send(msg)
290 }
291 }
292}
293
294// Shutdown performs a graceful shutdown of the application.
295func (app *App) Shutdown() {
296 if app.CoderAgent != nil {
297 app.CoderAgent.CancelAll()
298 }
299
300 app.cancelFuncsMutex.Lock()
301 for _, cancel := range app.watcherCancelFuncs {
302 cancel()
303 }
304 app.cancelFuncsMutex.Unlock()
305
306 // Wait for all LSP watchers to finish.
307 app.lspWatcherWG.Wait()
308
309 // Get all LSP clients.
310 app.clientsMutex.RLock()
311 clients := make(map[string]*lsp.Client, len(app.LSPClients))
312 maps.Copy(clients, app.LSPClients)
313 app.clientsMutex.RUnlock()
314
315 // Shutdown all LSP clients.
316 for name, client := range clients {
317 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
318 if err := client.Shutdown(shutdownCtx); err != nil {
319 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
320 }
321 cancel()
322 }
323
324 // Call call cleanup functions.
325 for _, cleanup := range app.cleanupFuncs {
326 if cleanup != nil {
327 cleanup()
328 }
329 }
330}