1package config
  2
  3import (
  4	"context"
  5	"encoding/json"
  6	"fmt"
  7	"io"
  8	"log/slog"
  9	"maps"
 10	"os"
 11	"os/exec"
 12	"path/filepath"
 13	"runtime"
 14	"slices"
 15	"strconv"
 16	"strings"
 17
 18	"github.com/charmbracelet/catwalk/pkg/catwalk"
 19	"github.com/charmbracelet/crush/internal/csync"
 20	"github.com/charmbracelet/crush/internal/env"
 21	"github.com/charmbracelet/crush/internal/fsext"
 22	"github.com/charmbracelet/crush/internal/home"
 23	"github.com/charmbracelet/crush/internal/log"
 24	powernapConfig "github.com/charmbracelet/x/powernap/pkg/config"
 25)
 26
 27const defaultCatwalkURL = "https://catwalk.charm.sh"
 28
 29// LoadReader config via io.Reader.
 30func LoadReader(fd io.Reader) (*Config, error) {
 31	data, err := io.ReadAll(fd)
 32	if err != nil {
 33		return nil, err
 34	}
 35
 36	var config Config
 37	err = json.Unmarshal(data, &config)
 38	if err != nil {
 39		return nil, err
 40	}
 41	return &config, err
 42}
 43
 44// Load loads the configuration from the default paths.
 45func Load(workingDir, dataDir string, debug bool) (*Config, error) {
 46	configPaths := lookupConfigs(workingDir)
 47
 48	cfg, err := loadFromConfigPaths(configPaths)
 49	if err != nil {
 50		return nil, fmt.Errorf("failed to load config from paths %v: %w", configPaths, err)
 51	}
 52
 53	cfg.dataConfigDir = GlobalConfigData()
 54
 55	cfg.setDefaults(workingDir, dataDir)
 56
 57	if debug {
 58		cfg.Options.Debug = true
 59	}
 60
 61	// Setup logs
 62	log.Setup(
 63		filepath.Join(cfg.Options.DataDirectory, "logs", fmt.Sprintf("%s.log", appName)),
 64		cfg.Options.Debug,
 65	)
 66
 67	if !isInsideWorktree() {
 68		const depth = 2
 69		const items = 100
 70		slog.Warn("No git repository detected in working directory, will limit file walk operations", "depth", depth, "items", items)
 71		assignIfNil(&cfg.Tools.Ls.MaxDepth, depth)
 72		assignIfNil(&cfg.Tools.Ls.MaxItems, items)
 73		assignIfNil(&cfg.Options.TUI.Completions.MaxDepth, depth)
 74		assignIfNil(&cfg.Options.TUI.Completions.MaxItems, items)
 75	}
 76
 77	// Load known providers, this loads the config from catwalk
 78	providers, err := Providers(cfg)
 79	if err != nil {
 80		return nil, err
 81	}
 82	cfg.knownProviders = providers
 83
 84	env := env.New()
 85	// Configure providers
 86	valueResolver := NewShellVariableResolver(env)
 87	cfg.resolver = valueResolver
 88	if err := cfg.configureProviders(env, valueResolver, cfg.knownProviders); err != nil {
 89		return nil, fmt.Errorf("failed to configure providers: %w", err)
 90	}
 91
 92	if !cfg.IsConfigured() {
 93		slog.Warn("No providers configured")
 94		return cfg, nil
 95	}
 96
 97	if err := cfg.configureSelectedModels(cfg.knownProviders); err != nil {
 98		return nil, fmt.Errorf("failed to configure selected models: %w", err)
 99	}
100	cfg.SetupAgents()
101	return cfg, nil
102}
103
104func PushPopCrushEnv() func() {
105	found := []string{}
106	for _, ev := range os.Environ() {
107		if strings.HasPrefix(ev, "CRUSH_") {
108			pair := strings.SplitN(ev, "=", 2)
109			if len(pair) != 2 {
110				continue
111			}
112			found = append(found, strings.TrimPrefix(pair[0], "CRUSH_"))
113		}
114	}
115	backups := make(map[string]string)
116	for _, ev := range found {
117		backups[ev] = os.Getenv(ev)
118	}
119
120	for _, ev := range found {
121		os.Setenv(ev, os.Getenv("CRUSH_"+ev))
122	}
123
124	restore := func() {
125		for k, v := range backups {
126			os.Setenv(k, v)
127		}
128	}
129	return restore
130}
131
132func (c *Config) configureProviders(env env.Env, resolver VariableResolver, knownProviders []catwalk.Provider) error {
133	knownProviderNames := make(map[string]bool)
134	restore := PushPopCrushEnv()
135	defer restore()
136	for _, p := range knownProviders {
137		knownProviderNames[string(p.ID)] = true
138		config, configExists := c.Providers.Get(string(p.ID))
139		// if the user configured a known provider we need to allow it to override a couple of parameters
140		if configExists {
141			if config.BaseURL != "" {
142				p.APIEndpoint = config.BaseURL
143			}
144			if config.APIKey != "" {
145				p.APIKey = config.APIKey
146			}
147			if len(config.Models) > 0 {
148				models := []catwalk.Model{}
149				seen := make(map[string]bool)
150
151				for _, model := range config.Models {
152					if seen[model.ID] {
153						continue
154					}
155					seen[model.ID] = true
156					if model.Name == "" {
157						model.Name = model.ID
158					}
159					models = append(models, model)
160				}
161				for _, model := range p.Models {
162					if seen[model.ID] {
163						continue
164					}
165					seen[model.ID] = true
166					if model.Name == "" {
167						model.Name = model.ID
168					}
169					models = append(models, model)
170				}
171
172				p.Models = models
173			}
174		}
175
176		headers := map[string]string{}
177		if len(p.DefaultHeaders) > 0 {
178			maps.Copy(headers, p.DefaultHeaders)
179		}
180		if len(config.ExtraHeaders) > 0 {
181			maps.Copy(headers, config.ExtraHeaders)
182		}
183		prepared := ProviderConfig{
184			ID:                 string(p.ID),
185			Name:               p.Name,
186			BaseURL:            p.APIEndpoint,
187			APIKey:             p.APIKey,
188			Type:               p.Type,
189			Disable:            config.Disable,
190			SystemPromptPrefix: config.SystemPromptPrefix,
191			ExtraHeaders:       headers,
192			ExtraBody:          config.ExtraBody,
193			ExtraParams:        make(map[string]string),
194			Models:             p.Models,
195		}
196
197		switch p.ID {
198		// Handle specific providers that require additional configuration
199		case catwalk.InferenceProviderVertexAI:
200			if !hasVertexCredentials(env) {
201				if configExists {
202					slog.Warn("Skipping Vertex AI provider due to missing credentials")
203					c.Providers.Del(string(p.ID))
204				}
205				continue
206			}
207			prepared.ExtraParams["project"] = env.Get("VERTEXAI_PROJECT")
208			prepared.ExtraParams["location"] = env.Get("VERTEXAI_LOCATION")
209		case catwalk.InferenceProviderAzure:
210			endpoint, err := resolver.ResolveValue(p.APIEndpoint)
211			if err != nil || endpoint == "" {
212				if configExists {
213					slog.Warn("Skipping Azure provider due to missing API endpoint", "provider", p.ID, "error", err)
214					c.Providers.Del(string(p.ID))
215				}
216				continue
217			}
218			prepared.BaseURL = endpoint
219			prepared.ExtraParams["apiVersion"] = env.Get("AZURE_OPENAI_API_VERSION")
220		case catwalk.InferenceProviderBedrock:
221			if !hasAWSCredentials(env) {
222				if configExists {
223					slog.Warn("Skipping Bedrock provider due to missing AWS credentials")
224					c.Providers.Del(string(p.ID))
225				}
226				continue
227			}
228			prepared.ExtraParams["region"] = env.Get("AWS_REGION")
229			if prepared.ExtraParams["region"] == "" {
230				prepared.ExtraParams["region"] = env.Get("AWS_DEFAULT_REGION")
231			}
232			for _, model := range p.Models {
233				if !strings.HasPrefix(model.ID, "anthropic.") {
234					return fmt.Errorf("bedrock provider only supports anthropic models for now, found: %s", model.ID)
235				}
236			}
237		default:
238			// if the provider api or endpoint are missing we skip them
239			v, err := resolver.ResolveValue(p.APIKey)
240			if v == "" || err != nil {
241				if configExists {
242					slog.Warn("Skipping provider due to missing API key", "provider", p.ID)
243					c.Providers.Del(string(p.ID))
244				}
245				continue
246			}
247		}
248		c.Providers.Set(string(p.ID), prepared)
249	}
250
251	// validate the custom providers
252	for id, providerConfig := range c.Providers.Seq2() {
253		if knownProviderNames[id] {
254			continue
255		}
256
257		// Make sure the provider ID is set
258		providerConfig.ID = id
259		if providerConfig.Name == "" {
260			providerConfig.Name = id // Use ID as name if not set
261		}
262		// default to OpenAI if not set
263		if providerConfig.Type == "" {
264			providerConfig.Type = catwalk.TypeOpenAICompat
265		}
266		if !slices.Contains(c.knownProviderTypes(), providerConfig.Type) {
267			slog.Warn("Skipping custom provider due to unsupported provider type", "provider", id)
268			c.Providers.Del(id)
269			continue
270		}
271
272		if providerConfig.Disable {
273			slog.Debug("Skipping custom provider due to disable flag", "provider", id)
274			c.Providers.Del(id)
275			continue
276		}
277		if providerConfig.APIKey == "" {
278			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
279		}
280		if providerConfig.BaseURL == "" {
281			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id)
282			c.Providers.Del(id)
283			continue
284		}
285		if len(providerConfig.Models) == 0 {
286			slog.Warn("Skipping custom provider because the provider has no models", "provider", id)
287			c.Providers.Del(id)
288			continue
289		}
290		apiKey, err := resolver.ResolveValue(providerConfig.APIKey)
291		if apiKey == "" || err != nil {
292			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
293		}
294		baseURL, err := resolver.ResolveValue(providerConfig.BaseURL)
295		if baseURL == "" || err != nil {
296			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id, "error", err)
297			c.Providers.Del(id)
298			continue
299		}
300
301		c.Providers.Set(id, providerConfig)
302	}
303	return nil
304}
305
306func (c *Config) knownProviderTypes() []catwalk.Type {
307	return []catwalk.Type{
308		catwalk.TypeOpenAI,
309		catwalk.TypeAnthropic,
310		catwalk.TypeAzure,
311		catwalk.TypeBedrock,
312		catwalk.TypeGoogle,
313		catwalk.TypeVertexAI,
314		catwalk.TypeOpenAICompat,
315	}
316}
317
318func (c *Config) setDefaults(workingDir, dataDir string) {
319	c.workingDir = workingDir
320	if c.Options == nil {
321		c.Options = &Options{}
322	}
323	if c.Options.TUI == nil {
324		c.Options.TUI = &TUIOptions{}
325	}
326	if c.Options.ContextPaths == nil {
327		c.Options.ContextPaths = []string{}
328	}
329	if dataDir != "" {
330		c.Options.DataDirectory = dataDir
331	} else if c.Options.DataDirectory == "" {
332		if path, ok := fsext.LookupClosest(workingDir, defaultDataDirectory); ok {
333			c.Options.DataDirectory = path
334		} else {
335			c.Options.DataDirectory = filepath.Join(workingDir, defaultDataDirectory)
336		}
337	}
338	if c.Providers == nil {
339		c.Providers = csync.NewMap[string, ProviderConfig]()
340	}
341	if c.Models == nil {
342		c.Models = make(map[SelectedModelType]SelectedModel)
343	}
344	if c.MCP == nil {
345		c.MCP = make(map[string]MCPConfig)
346	}
347	if c.LSP == nil {
348		c.LSP = make(map[string]LSPConfig)
349	}
350
351	// Apply defaults to LSP configurations
352	c.applyLSPDefaults()
353
354	// Add the default context paths if they are not already present
355	c.Options.ContextPaths = append(defaultContextPaths, c.Options.ContextPaths...)
356	slices.Sort(c.Options.ContextPaths)
357	c.Options.ContextPaths = slices.Compact(c.Options.ContextPaths)
358
359	if str, ok := os.LookupEnv("CRUSH_DISABLE_PROVIDER_AUTO_UPDATE"); ok {
360		c.Options.DisableProviderAutoUpdate, _ = strconv.ParseBool(str)
361	}
362
363	if c.Options.Attribution == nil {
364		c.Options.Attribution = &Attribution{
365			CoAuthoredBy:  true,
366			GeneratedWith: true,
367		}
368	}
369}
370
371// applyLSPDefaults applies default values from powernap to LSP configurations
372func (c *Config) applyLSPDefaults() {
373	// Get powernap's default configuration
374	configManager := powernapConfig.NewManager()
375	configManager.LoadDefaults()
376
377	// Apply defaults to each LSP configuration
378	for name, cfg := range c.LSP {
379		// Try to get defaults from powernap based on name or command name.
380		base, ok := configManager.GetServer(name)
381		if !ok {
382			base, ok = configManager.GetServer(cfg.Command)
383			if !ok {
384				continue
385			}
386		}
387		if cfg.Options == nil {
388			cfg.Options = base.Settings
389		}
390		if cfg.InitOptions == nil {
391			cfg.InitOptions = base.InitOptions
392		}
393		if len(cfg.FileTypes) == 0 {
394			cfg.FileTypes = base.FileTypes
395		}
396		if len(cfg.RootMarkers) == 0 {
397			cfg.RootMarkers = base.RootMarkers
398		}
399		if cfg.Command == "" {
400			cfg.Command = base.Command
401		}
402		if len(cfg.Args) == 0 {
403			cfg.Args = base.Args
404		}
405		if len(cfg.Env) == 0 {
406			cfg.Env = base.Environment
407		}
408		// Update the config in the map
409		c.LSP[name] = cfg
410	}
411}
412
413func (c *Config) defaultModelSelection(knownProviders []catwalk.Provider) (largeModel SelectedModel, smallModel SelectedModel, err error) {
414	if len(knownProviders) == 0 && c.Providers.Len() == 0 {
415		err = fmt.Errorf("no providers configured, please configure at least one provider")
416		return largeModel, smallModel, err
417	}
418
419	// Use the first provider enabled based on the known providers order
420	// if no provider found that is known use the first provider configured
421	for _, p := range knownProviders {
422		providerConfig, ok := c.Providers.Get(string(p.ID))
423		if !ok || providerConfig.Disable {
424			continue
425		}
426		defaultLargeModel := c.GetModel(string(p.ID), p.DefaultLargeModelID)
427		if defaultLargeModel == nil {
428			err = fmt.Errorf("default large model %s not found for provider %s", p.DefaultLargeModelID, p.ID)
429			return largeModel, smallModel, err
430		}
431		largeModel = SelectedModel{
432			Provider:        string(p.ID),
433			Model:           defaultLargeModel.ID,
434			MaxTokens:       defaultLargeModel.DefaultMaxTokens,
435			ReasoningEffort: defaultLargeModel.DefaultReasoningEffort,
436		}
437
438		defaultSmallModel := c.GetModel(string(p.ID), p.DefaultSmallModelID)
439		if defaultSmallModel == nil {
440			err = fmt.Errorf("default small model %s not found for provider %s", p.DefaultSmallModelID, p.ID)
441			return largeModel, smallModel, err
442		}
443		smallModel = SelectedModel{
444			Provider:        string(p.ID),
445			Model:           defaultSmallModel.ID,
446			MaxTokens:       defaultSmallModel.DefaultMaxTokens,
447			ReasoningEffort: defaultSmallModel.DefaultReasoningEffort,
448		}
449		return largeModel, smallModel, err
450	}
451
452	enabledProviders := c.EnabledProviders()
453	slices.SortFunc(enabledProviders, func(a, b ProviderConfig) int {
454		return strings.Compare(a.ID, b.ID)
455	})
456
457	if len(enabledProviders) == 0 {
458		err = fmt.Errorf("no providers configured, please configure at least one provider")
459		return largeModel, smallModel, err
460	}
461
462	providerConfig := enabledProviders[0]
463	if len(providerConfig.Models) == 0 {
464		err = fmt.Errorf("provider %s has no models configured", providerConfig.ID)
465		return largeModel, smallModel, err
466	}
467	defaultLargeModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
468	largeModel = SelectedModel{
469		Provider:  providerConfig.ID,
470		Model:     defaultLargeModel.ID,
471		MaxTokens: defaultLargeModel.DefaultMaxTokens,
472	}
473	defaultSmallModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
474	smallModel = SelectedModel{
475		Provider:  providerConfig.ID,
476		Model:     defaultSmallModel.ID,
477		MaxTokens: defaultSmallModel.DefaultMaxTokens,
478	}
479	return largeModel, smallModel, err
480}
481
482func (c *Config) configureSelectedModels(knownProviders []catwalk.Provider) error {
483	defaultLarge, defaultSmall, err := c.defaultModelSelection(knownProviders)
484	if err != nil {
485		return fmt.Errorf("failed to select default models: %w", err)
486	}
487	large, small := defaultLarge, defaultSmall
488
489	largeModelSelected, largeModelConfigured := c.Models[SelectedModelTypeLarge]
490	if largeModelConfigured {
491		if largeModelSelected.Model != "" {
492			large.Model = largeModelSelected.Model
493		}
494		if largeModelSelected.Provider != "" {
495			large.Provider = largeModelSelected.Provider
496		}
497		model := c.GetModel(large.Provider, large.Model)
498		if model == nil {
499			large = defaultLarge
500			// override the model type to large
501			err := c.UpdatePreferredModel(SelectedModelTypeLarge, large)
502			if err != nil {
503				return fmt.Errorf("failed to update preferred large model: %w", err)
504			}
505		} else {
506			if largeModelSelected.MaxTokens > 0 {
507				large.MaxTokens = largeModelSelected.MaxTokens
508			} else {
509				large.MaxTokens = model.DefaultMaxTokens
510			}
511			if largeModelSelected.ReasoningEffort != "" {
512				large.ReasoningEffort = largeModelSelected.ReasoningEffort
513			}
514			large.Think = largeModelSelected.Think
515		}
516	}
517	smallModelSelected, smallModelConfigured := c.Models[SelectedModelTypeSmall]
518	if smallModelConfigured {
519		if smallModelSelected.Model != "" {
520			small.Model = smallModelSelected.Model
521		}
522		if smallModelSelected.Provider != "" {
523			small.Provider = smallModelSelected.Provider
524		}
525
526		model := c.GetModel(small.Provider, small.Model)
527		if model == nil {
528			small = defaultSmall
529			// override the model type to small
530			err := c.UpdatePreferredModel(SelectedModelTypeSmall, small)
531			if err != nil {
532				return fmt.Errorf("failed to update preferred small model: %w", err)
533			}
534		} else {
535			if smallModelSelected.MaxTokens > 0 {
536				small.MaxTokens = smallModelSelected.MaxTokens
537			} else {
538				small.MaxTokens = model.DefaultMaxTokens
539			}
540			small.ReasoningEffort = smallModelSelected.ReasoningEffort
541			small.Think = smallModelSelected.Think
542		}
543	}
544	c.Models[SelectedModelTypeLarge] = large
545	c.Models[SelectedModelTypeSmall] = small
546	return nil
547}
548
549// lookupConfigs searches config files recursively from CWD up to FS root
550func lookupConfigs(cwd string) []string {
551	// prepend default config paths
552	configPaths := []string{
553		GlobalConfig(),
554		GlobalConfigData(),
555	}
556
557	configNames := []string{appName + ".json", "." + appName + ".json"}
558
559	foundConfigs, err := fsext.Lookup(cwd, configNames...)
560	if err != nil {
561		// returns at least default configs
562		return configPaths
563	}
564
565	// reverse order so last config has more priority
566	slices.Reverse(foundConfigs)
567
568	return append(configPaths, foundConfigs...)
569}
570
571func loadFromConfigPaths(configPaths []string) (*Config, error) {
572	var configs []io.Reader
573
574	for _, path := range configPaths {
575		fd, err := os.Open(path)
576		if err != nil {
577			if os.IsNotExist(err) {
578				continue
579			}
580			return nil, fmt.Errorf("failed to open config file %s: %w", path, err)
581		}
582		defer fd.Close()
583
584		configs = append(configs, fd)
585	}
586
587	return loadFromReaders(configs)
588}
589
590func loadFromReaders(readers []io.Reader) (*Config, error) {
591	if len(readers) == 0 {
592		return &Config{}, nil
593	}
594
595	merged, err := Merge(readers)
596	if err != nil {
597		return nil, fmt.Errorf("failed to merge configuration readers: %w", err)
598	}
599
600	return LoadReader(merged)
601}
602
603func hasVertexCredentials(env env.Env) bool {
604	hasProject := env.Get("VERTEXAI_PROJECT") != ""
605	hasLocation := env.Get("VERTEXAI_LOCATION") != ""
606	return hasProject && hasLocation
607}
608
609func hasAWSCredentials(env env.Env) bool {
610	if env.Get("AWS_BEARER_TOKEN_BEDROCK") != "" {
611		return true
612	}
613
614	if env.Get("AWS_ACCESS_KEY_ID") != "" && env.Get("AWS_SECRET_ACCESS_KEY") != "" {
615		return true
616	}
617
618	if env.Get("AWS_PROFILE") != "" || env.Get("AWS_DEFAULT_PROFILE") != "" {
619		return true
620	}
621
622	if env.Get("AWS_REGION") != "" || env.Get("AWS_DEFAULT_REGION") != "" {
623		return true
624	}
625
626	if env.Get("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI") != "" ||
627		env.Get("AWS_CONTAINER_CREDENTIALS_FULL_URI") != "" {
628		return true
629	}
630
631	if _, err := os.Stat(filepath.Join(home.Dir(), ".aws/credentials")); err == nil {
632		return true
633	}
634
635	return false
636}
637
638// GlobalConfig returns the global configuration file path for the application.
639func GlobalConfig() string {
640	xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
641	if xdgConfigHome != "" {
642		return filepath.Join(xdgConfigHome, appName, fmt.Sprintf("%s.json", appName))
643	}
644
645	// return the path to the main config directory
646	// for windows, it should be in `%LOCALAPPDATA%/crush/`
647	// for linux and macOS, it should be in `$HOME/.config/crush/`
648	if runtime.GOOS == "windows" {
649		localAppData := os.Getenv("LOCALAPPDATA")
650		if localAppData == "" {
651			localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
652		}
653		return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
654	}
655
656	return filepath.Join(home.Dir(), ".config", appName, fmt.Sprintf("%s.json", appName))
657}
658
659// GlobalConfigData returns the path to the main data directory for the application.
660// this config is used when the app overrides configurations instead of updating the global config.
661func GlobalConfigData() string {
662	xdgDataHome := os.Getenv("XDG_DATA_HOME")
663	if xdgDataHome != "" {
664		return filepath.Join(xdgDataHome, appName, fmt.Sprintf("%s.json", appName))
665	}
666
667	// return the path to the main data directory
668	// for windows, it should be in `%LOCALAPPDATA%/crush/`
669	// for linux and macOS, it should be in `$HOME/.local/share/crush/`
670	if runtime.GOOS == "windows" {
671		localAppData := os.Getenv("LOCALAPPDATA")
672		if localAppData == "" {
673			localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
674		}
675		return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
676	}
677
678	return filepath.Join(home.Dir(), ".local", "share", appName, fmt.Sprintf("%s.json", appName))
679}
680
681func assignIfNil[T any](ptr **T, val T) {
682	if *ptr == nil {
683		*ptr = &val
684	}
685}
686
687func isInsideWorktree() bool {
688	bts, err := exec.CommandContext(
689		context.Background(),
690		"git", "rev-parse",
691		"--is-inside-work-tree",
692	).CombinedOutput()
693	return err == nil && strings.TrimSpace(string(bts)) == "true"
694}