1package config
2
3import (
4 "encoding/json"
5 "fmt"
6 "io"
7 "os"
8 "path/filepath"
9 "runtime"
10 "slices"
11 "strings"
12
13 "github.com/charmbracelet/crush/internal/env"
14 "github.com/charmbracelet/crush/internal/fur/client"
15 "github.com/charmbracelet/crush/internal/fur/provider"
16 "github.com/charmbracelet/crush/internal/log"
17 "golang.org/x/exp/slog"
18)
19
20// LoadReader config via io.Reader.
21func LoadReader(fd io.Reader) (*Config, error) {
22 data, err := io.ReadAll(fd)
23 if err != nil {
24 return nil, err
25 }
26
27 var config Config
28 err = json.Unmarshal(data, &config)
29 if err != nil {
30 return nil, err
31 }
32 return &config, err
33}
34
35// Load loads the configuration from the default paths.
36func Load(workingDir string, debug bool) (*Config, error) {
37 // uses default config paths
38 configPaths := []string{
39 globalConfig(),
40 globalConfigData(),
41 filepath.Join(workingDir, fmt.Sprintf("%s.json", appName)),
42 filepath.Join(workingDir, fmt.Sprintf(".%s.json", appName)),
43 }
44 cfg, err := loadFromConfigPaths(configPaths)
45 if err != nil {
46 return nil, fmt.Errorf("failed to load config from paths %v: %w", configPaths, err)
47 }
48
49 cfg.setDefaults(workingDir)
50
51 if debug {
52 cfg.Options.Debug = true
53 }
54
55 // Init logs
56 log.Init(
57 filepath.Join(cfg.Options.DataDirectory, "logs", fmt.Sprintf("%s.log", appName)),
58 cfg.Options.Debug,
59 )
60
61 if err != nil {
62 return nil, fmt.Errorf("failed to load config: %w", err)
63 }
64
65 // Load known providers, this loads the config from fur
66 providers, err := LoadProviders(client.New())
67 if err != nil || len(providers) == 0 {
68 return nil, fmt.Errorf("failed to load providers: %w", err)
69 }
70
71 env := env.New()
72 // Configure providers
73 valueResolver := NewShellVariableResolver(env)
74 cfg.resolver = valueResolver
75 if err := cfg.configureProviders(env, valueResolver, providers); err != nil {
76 return nil, fmt.Errorf("failed to configure providers: %w", err)
77 }
78
79 if !cfg.IsConfigured() {
80 slog.Warn("No providers configured")
81 return cfg, nil
82 }
83
84 if err := cfg.configureSelectedModels(providers); err != nil {
85 return nil, fmt.Errorf("failed to configure selected models: %w", err)
86 }
87
88 // TODO: remove the agents concept from the config
89 agents := map[string]Agent{
90 "coder": {
91 ID: "coder",
92 Name: "Coder",
93 Description: "An agent that helps with executing coding tasks.",
94 Model: SelectedModelTypeLarge,
95 ContextPaths: cfg.Options.ContextPaths,
96 // All tools allowed
97 },
98 "task": {
99 ID: "task",
100 Name: "Task",
101 Description: "An agent that helps with searching for context and finding implementation details.",
102 Model: SelectedModelTypeLarge,
103 ContextPaths: cfg.Options.ContextPaths,
104 AllowedTools: []string{
105 "glob",
106 "grep",
107 "ls",
108 "sourcegraph",
109 "view",
110 },
111 // NO MCPs or LSPs by default
112 AllowedMCP: map[string][]string{},
113 AllowedLSP: []string{},
114 },
115 }
116 cfg.Agents = agents
117
118 return cfg, nil
119}
120
121func (cfg *Config) configureProviders(env env.Env, resolver VariableResolver, knownProviders []provider.Provider) error {
122 knownProviderNames := make(map[string]bool)
123 for _, p := range knownProviders {
124 knownProviderNames[string(p.ID)] = true
125 config, configExists := cfg.Providers[string(p.ID)]
126 // if the user configured a known provider we need to allow it to override a couple of parameters
127 if configExists {
128 if config.Disable {
129 slog.Debug("Skipping provider due to disable flag", "provider", p.ID)
130 delete(cfg.Providers, string(p.ID))
131 continue
132 }
133 if config.BaseURL != "" {
134 p.APIEndpoint = config.BaseURL
135 }
136 if config.APIKey != "" {
137 p.APIKey = config.APIKey
138 }
139 if len(config.Models) > 0 {
140 models := []provider.Model{}
141 seen := make(map[string]bool)
142
143 for _, model := range config.Models {
144 if seen[model.ID] {
145 continue
146 }
147 seen[model.ID] = true
148 if model.Model == "" {
149 model.Model = model.ID
150 }
151 models = append(models, model)
152 }
153 for _, model := range p.Models {
154 if seen[model.ID] {
155 continue
156 }
157 seen[model.ID] = true
158 if model.Model == "" {
159 model.Model = model.ID
160 }
161 models = append(models, model)
162 }
163
164 p.Models = models
165 }
166 }
167 prepared := ProviderConfig{
168 ID: string(p.ID),
169 BaseURL: p.APIEndpoint,
170 APIKey: p.APIKey,
171 Type: p.Type,
172 Disable: config.Disable,
173 ExtraHeaders: config.ExtraHeaders,
174 ExtraParams: make(map[string]string),
175 Models: p.Models,
176 }
177
178 switch p.ID {
179 // Handle specific providers that require additional configuration
180 case provider.InferenceProviderVertexAI:
181 if !hasVertexCredentials(env) {
182 if configExists {
183 slog.Warn("Skipping Vertex AI provider due to missing credentials")
184 delete(cfg.Providers, string(p.ID))
185 }
186 continue
187 }
188 prepared.ExtraParams["project"] = env.Get("GOOGLE_CLOUD_PROJECT")
189 prepared.ExtraParams["location"] = env.Get("GOOGLE_CLOUD_LOCATION")
190 case provider.InferenceProviderBedrock:
191 if !hasAWSCredentials(env) {
192 if configExists {
193 slog.Warn("Skipping Bedrock provider due to missing AWS credentials")
194 delete(cfg.Providers, string(p.ID))
195 }
196 continue
197 }
198 for _, model := range p.Models {
199 if !strings.HasPrefix(model.ID, "anthropic.") {
200 return fmt.Errorf("bedrock provider only supports anthropic models for now, found: %s", model.ID)
201 }
202 }
203 default:
204 // if the provider api or endpoint are missing we skip them
205 v, err := resolver.ResolveValue(p.APIKey)
206 if v == "" || err != nil {
207 if configExists {
208 slog.Warn("Skipping provider due to missing API key", "provider", p.ID)
209 delete(cfg.Providers, string(p.ID))
210 }
211 continue
212 }
213 }
214 cfg.Providers[string(p.ID)] = prepared
215 }
216
217 // validate the custom providers
218 for id, providerConfig := range cfg.Providers {
219 if knownProviderNames[id] {
220 continue
221 }
222
223 // Make sure the provider ID is set
224 providerConfig.ID = id
225 // default to OpenAI if not set
226 if providerConfig.Type == "" {
227 providerConfig.Type = provider.TypeOpenAI
228 }
229
230 if providerConfig.Disable {
231 slog.Debug("Skipping custom provider due to disable flag", "provider", id)
232 delete(cfg.Providers, id)
233 continue
234 }
235 if providerConfig.APIKey == "" {
236 slog.Warn("Skipping custom provider due to missing API key", "provider", id)
237 delete(cfg.Providers, id)
238 continue
239 }
240 if providerConfig.BaseURL == "" {
241 slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id)
242 delete(cfg.Providers, id)
243 continue
244 }
245 if len(providerConfig.Models) == 0 {
246 slog.Warn("Skipping custom provider because the provider has no models", "provider", id)
247 delete(cfg.Providers, id)
248 continue
249 }
250 if providerConfig.Type != provider.TypeOpenAI {
251 slog.Warn("Skipping custom provider because the provider type is not supported", "provider", id, "type", providerConfig.Type)
252 delete(cfg.Providers, id)
253 continue
254 }
255
256 apiKey, err := resolver.ResolveValue(providerConfig.APIKey)
257 if apiKey == "" || err != nil {
258 slog.Warn("Skipping custom provider due to missing API key", "provider", id, "error", err)
259 delete(cfg.Providers, id)
260 continue
261 }
262 baseURL, err := resolver.ResolveValue(providerConfig.BaseURL)
263 if baseURL == "" || err != nil {
264 slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id, "error", err)
265 delete(cfg.Providers, id)
266 continue
267 }
268
269 cfg.Providers[id] = providerConfig
270 }
271 return nil
272}
273
274func (cfg *Config) setDefaults(workingDir string) {
275 cfg.workingDir = workingDir
276 if cfg.Options == nil {
277 cfg.Options = &Options{}
278 }
279 if cfg.Options.TUI == nil {
280 cfg.Options.TUI = &TUIOptions{}
281 }
282 if cfg.Options.ContextPaths == nil {
283 cfg.Options.ContextPaths = []string{}
284 }
285 if cfg.Options.DataDirectory == "" {
286 cfg.Options.DataDirectory = filepath.Join(workingDir, defaultDataDirectory)
287 }
288 if cfg.Providers == nil {
289 cfg.Providers = make(map[string]ProviderConfig)
290 }
291 if cfg.Models == nil {
292 cfg.Models = make(map[SelectedModelType]SelectedModel)
293 }
294 if cfg.MCP == nil {
295 cfg.MCP = make(map[string]MCPConfig)
296 }
297 if cfg.LSP == nil {
298 cfg.LSP = make(map[string]LSPConfig)
299 }
300
301 // Add the default context paths if they are not already present
302 cfg.Options.ContextPaths = append(defaultContextPaths, cfg.Options.ContextPaths...)
303 slices.Sort(cfg.Options.ContextPaths)
304 cfg.Options.ContextPaths = slices.Compact(cfg.Options.ContextPaths)
305}
306
307func (cfg *Config) defaultModelSelection(knownProviders []provider.Provider) (largeModel SelectedModel, smallModel SelectedModel, err error) {
308 if len(knownProviders) == 0 && len(cfg.Providers) == 0 {
309 err = fmt.Errorf("no providers configured, please configure at least one provider")
310 return
311 }
312
313 // Use the first provider enabled based on the known providers order
314 // if no provider found that is known use the first provider configured
315 for _, p := range knownProviders {
316 providerConfig, ok := cfg.Providers[string(p.ID)]
317 if !ok || providerConfig.Disable {
318 continue
319 }
320 defaultLargeModel := cfg.GetModel(string(p.ID), p.DefaultLargeModelID)
321 if defaultLargeModel == nil {
322 err = fmt.Errorf("default large model %s not found for provider %s", p.DefaultLargeModelID, p.ID)
323 return
324 }
325 largeModel = SelectedModel{
326 Provider: string(p.ID),
327 Model: defaultLargeModel.ID,
328 MaxTokens: defaultLargeModel.DefaultMaxTokens,
329 ReasoningEffort: defaultLargeModel.DefaultReasoningEffort,
330 }
331
332 defaultSmallModel := cfg.GetModel(string(p.ID), p.DefaultSmallModelID)
333 if defaultSmallModel == nil {
334 err = fmt.Errorf("default small model %s not found for provider %s", p.DefaultSmallModelID, p.ID)
335 }
336 smallModel = SelectedModel{
337 Provider: string(p.ID),
338 Model: defaultSmallModel.ID,
339 MaxTokens: defaultSmallModel.DefaultMaxTokens,
340 ReasoningEffort: defaultSmallModel.DefaultReasoningEffort,
341 }
342 return
343 }
344
345 enabledProviders := cfg.EnabledProviders()
346 slices.SortFunc(enabledProviders, func(a, b ProviderConfig) int {
347 return strings.Compare(a.ID, b.ID)
348 })
349
350 if len(enabledProviders) == 0 {
351 err = fmt.Errorf("no providers configured, please configure at least one provider")
352 return
353 }
354
355 providerConfig := enabledProviders[0]
356 if len(providerConfig.Models) == 0 {
357 err = fmt.Errorf("provider %s has no models configured", providerConfig.ID)
358 return
359 }
360 defaultLargeModel := cfg.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
361 largeModel = SelectedModel{
362 Provider: providerConfig.ID,
363 Model: defaultLargeModel.ID,
364 MaxTokens: defaultLargeModel.DefaultMaxTokens,
365 }
366 defaultSmallModel := cfg.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
367 smallModel = SelectedModel{
368 Provider: providerConfig.ID,
369 Model: defaultSmallModel.ID,
370 MaxTokens: defaultSmallModel.DefaultMaxTokens,
371 }
372 return
373}
374
375func (cfg *Config) configureSelectedModels(knownProviders []provider.Provider) error {
376 large, small, err := cfg.defaultModelSelection(knownProviders)
377 if err != nil {
378 return fmt.Errorf("failed to select default models: %w", err)
379 }
380
381 largeModelSelected, largeModelConfigured := cfg.Models[SelectedModelTypeLarge]
382 if largeModelConfigured {
383 if largeModelSelected.Model != "" {
384 large.Model = largeModelSelected.Model
385 }
386 if largeModelSelected.Provider != "" {
387 large.Provider = largeModelSelected.Provider
388 }
389 model := cfg.GetModel(large.Provider, large.Model)
390 if model == nil {
391 return fmt.Errorf("large model %s not found for provider %s", large.Model, large.Provider)
392 }
393 if largeModelSelected.MaxTokens > 0 {
394 large.MaxTokens = largeModelSelected.MaxTokens
395 } else {
396 large.MaxTokens = model.DefaultMaxTokens
397 }
398 if largeModelSelected.ReasoningEffort != "" {
399 large.ReasoningEffort = largeModelSelected.ReasoningEffort
400 }
401 large.Think = largeModelSelected.Think
402 }
403 smallModelSelected, smallModelConfigured := cfg.Models[SelectedModelTypeSmall]
404 if smallModelConfigured {
405 if smallModelSelected.Model != "" {
406 small.Model = smallModelSelected.Model
407 }
408 if smallModelSelected.Provider != "" {
409 small.Provider = smallModelSelected.Provider
410 }
411
412 model := cfg.GetModel(small.Provider, small.Model)
413 if model == nil {
414 return fmt.Errorf("large model %s not found for provider %s", large.Model, large.Provider)
415 }
416 if smallModelSelected.MaxTokens > 0 {
417 small.MaxTokens = smallModelSelected.MaxTokens
418 } else {
419 small.MaxTokens = model.DefaultMaxTokens
420 }
421 small.ReasoningEffort = smallModelSelected.ReasoningEffort
422 small.Think = smallModelSelected.Think
423 }
424
425 // validate the selected models
426 largeModel := cfg.GetModel(large.Provider, large.Model)
427 if largeModel == nil {
428 return fmt.Errorf("large model %s not found for provider %s", large.Model, large.Provider)
429 }
430 smallModel := cfg.GetModel(small.Provider, small.Model)
431 if smallModel == nil {
432 return fmt.Errorf("small model %s not found for provider %s", small.Model, small.Provider)
433 }
434 cfg.Models[SelectedModelTypeLarge] = large
435 cfg.Models[SelectedModelTypeSmall] = small
436 return nil
437}
438
439func loadFromConfigPaths(configPaths []string) (*Config, error) {
440 var configs []io.Reader
441
442 for _, path := range configPaths {
443 fd, err := os.Open(path)
444 if err != nil {
445 if os.IsNotExist(err) {
446 continue
447 }
448 return nil, fmt.Errorf("failed to open config file %s: %w", path, err)
449 }
450 defer fd.Close()
451
452 configs = append(configs, fd)
453 }
454
455 return loadFromReaders(configs)
456}
457
458func loadFromReaders(readers []io.Reader) (*Config, error) {
459 if len(readers) == 0 {
460 return &Config{}, nil
461 }
462
463 merged, err := Merge(readers)
464 if err != nil {
465 return nil, fmt.Errorf("failed to merge configuration readers: %w", err)
466 }
467
468 return LoadReader(merged)
469}
470
471func hasVertexCredentials(env env.Env) bool {
472 useVertex := env.Get("GOOGLE_GENAI_USE_VERTEXAI") == "true"
473 hasProject := env.Get("GOOGLE_CLOUD_PROJECT") != ""
474 hasLocation := env.Get("GOOGLE_CLOUD_LOCATION") != ""
475 return useVertex && hasProject && hasLocation
476}
477
478func hasAWSCredentials(env env.Env) bool {
479 if env.Get("AWS_ACCESS_KEY_ID") != "" && env.Get("AWS_SECRET_ACCESS_KEY") != "" {
480 return true
481 }
482
483 if env.Get("AWS_PROFILE") != "" || env.Get("AWS_DEFAULT_PROFILE") != "" {
484 return true
485 }
486
487 if env.Get("AWS_REGION") != "" || env.Get("AWS_DEFAULT_REGION") != "" {
488 return true
489 }
490
491 if env.Get("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI") != "" ||
492 env.Get("AWS_CONTAINER_CREDENTIALS_FULL_URI") != "" {
493 return true
494 }
495
496 return false
497}
498
499func globalConfig() string {
500 xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
501 if xdgConfigHome != "" {
502 return filepath.Join(xdgConfigHome, appName, fmt.Sprintf("%s.json", appName))
503 }
504
505 // return the path to the main config directory
506 // for windows, it should be in `%LOCALAPPDATA%/crush/`
507 // for linux and macOS, it should be in `$HOME/.config/crush/`
508 if runtime.GOOS == "windows" {
509 localAppData := os.Getenv("LOCALAPPDATA")
510 if localAppData == "" {
511 localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
512 }
513 return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
514 }
515
516 return filepath.Join(os.Getenv("HOME"), ".config", appName, fmt.Sprintf("%s.json", appName))
517}
518
519// globalConfigData returns the path to the main data directory for the application.
520// this config is used when the app overrides configurations instead of updating the global config.
521func globalConfigData() string {
522 xdgDataHome := os.Getenv("XDG_DATA_HOME")
523 if xdgDataHome != "" {
524 return filepath.Join(xdgDataHome, appName, fmt.Sprintf("%s.json", appName))
525 }
526
527 // return the path to the main data directory
528 // for windows, it should be in `%LOCALAPPDATA%/crush/`
529 // for linux and macOS, it should be in `$HOME/.local/share/crush/`
530 if runtime.GOOS == "windows" {
531 localAppData := os.Getenv("LOCALAPPDATA")
532 if localAppData == "" {
533 localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
534 }
535 return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
536 }
537
538 return filepath.Join(os.Getenv("HOME"), ".local", "share", appName, fmt.Sprintf("%s.json", appName))
539}