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
137	for _, p := range knownProviders {
138		knownProviderNames[string(p.ID)] = true
139		config, configExists := c.Providers.Get(string(p.ID))
140		// if the user configured a known provider we need to allow it to override a couple of parameters
141		if configExists {
142			if config.BaseURL != "" {
143				p.APIEndpoint = config.BaseURL
144			}
145			if config.APIKey != "" {
146				p.APIKey = config.APIKey
147			}
148			if len(config.Models) > 0 {
149				models := []catwalk.Model{}
150				seen := make(map[string]bool)
151
152				for _, model := range config.Models {
153					if seen[model.ID] {
154						continue
155					}
156					seen[model.ID] = true
157					if model.Name == "" {
158						model.Name = model.ID
159					}
160					models = append(models, model)
161				}
162				for _, model := range p.Models {
163					if seen[model.ID] {
164						continue
165					}
166					seen[model.ID] = true
167					if model.Name == "" {
168						model.Name = model.ID
169					}
170					models = append(models, model)
171				}
172
173				p.Models = models
174			}
175		}
176
177		headers := map[string]string{}
178		if len(p.DefaultHeaders) > 0 {
179			maps.Copy(headers, p.DefaultHeaders)
180		}
181		if len(config.ExtraHeaders) > 0 {
182			maps.Copy(headers, config.ExtraHeaders)
183		}
184		prepared := ProviderConfig{
185			ID:                 string(p.ID),
186			Name:               p.Name,
187			BaseURL:            p.APIEndpoint,
188			APIKey:             p.APIKey,
189			APIKeyTemplate:     p.APIKey, // Store original template for re-resolution
190			OAuthToken:         config.OAuthToken,
191			Type:               p.Type,
192			Disable:            config.Disable,
193			SystemPromptPrefix: config.SystemPromptPrefix,
194			ExtraHeaders:       headers,
195			ExtraBody:          config.ExtraBody,
196			ExtraParams:        make(map[string]string),
197			Models:             p.Models,
198		}
199
200		if p.ID == catwalk.InferenceProviderAnthropic && config.OAuthToken != nil {
201			prepared.SetupClaudeCode()
202		}
203
204		switch p.ID {
205		// Handle specific providers that require additional configuration
206		case catwalk.InferenceProviderVertexAI:
207			if !hasVertexCredentials(env) {
208				if configExists {
209					slog.Warn("Skipping Vertex AI provider due to missing credentials")
210					c.Providers.Del(string(p.ID))
211				}
212				continue
213			}
214			prepared.ExtraParams["project"] = env.Get("VERTEXAI_PROJECT")
215			prepared.ExtraParams["location"] = env.Get("VERTEXAI_LOCATION")
216		case catwalk.InferenceProviderAzure:
217			endpoint, err := resolver.ResolveValue(p.APIEndpoint)
218			if err != nil || endpoint == "" {
219				if configExists {
220					slog.Warn("Skipping Azure provider due to missing API endpoint", "provider", p.ID, "error", err)
221					c.Providers.Del(string(p.ID))
222				}
223				continue
224			}
225			prepared.BaseURL = endpoint
226			prepared.ExtraParams["apiVersion"] = env.Get("AZURE_OPENAI_API_VERSION")
227		case catwalk.InferenceProviderBedrock:
228			if !hasAWSCredentials(env) {
229				if configExists {
230					slog.Warn("Skipping Bedrock provider due to missing AWS credentials")
231					c.Providers.Del(string(p.ID))
232				}
233				continue
234			}
235			prepared.ExtraParams["region"] = env.Get("AWS_REGION")
236			if prepared.ExtraParams["region"] == "" {
237				prepared.ExtraParams["region"] = env.Get("AWS_DEFAULT_REGION")
238			}
239			for _, model := range p.Models {
240				if !strings.HasPrefix(model.ID, "anthropic.") {
241					return fmt.Errorf("bedrock provider only supports anthropic models for now, found: %s", model.ID)
242				}
243			}
244		default:
245			// if the provider api or endpoint are missing we skip them
246			v, err := resolver.ResolveValue(p.APIKey)
247			if v == "" || err != nil {
248				if configExists {
249					slog.Warn("Skipping provider due to missing API key", "provider", p.ID)
250					c.Providers.Del(string(p.ID))
251				}
252				continue
253			}
254		}
255		c.Providers.Set(string(p.ID), prepared)
256	}
257
258	// validate the custom providers
259	for id, providerConfig := range c.Providers.Seq2() {
260		if knownProviderNames[id] {
261			continue
262		}
263
264		// Make sure the provider ID is set
265		providerConfig.ID = id
266		if providerConfig.Name == "" {
267			providerConfig.Name = id // Use ID as name if not set
268		}
269		// default to OpenAI if not set
270		if providerConfig.Type == "" {
271			providerConfig.Type = catwalk.TypeOpenAICompat
272		}
273		if !slices.Contains(catwalk.KnownProviderTypes(), providerConfig.Type) {
274			slog.Warn("Skipping custom provider due to unsupported provider type", "provider", id)
275			c.Providers.Del(id)
276			continue
277		}
278
279		if providerConfig.Disable {
280			slog.Debug("Skipping custom provider due to disable flag", "provider", id)
281			c.Providers.Del(id)
282			continue
283		}
284		if providerConfig.APIKey == "" {
285			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
286		}
287		if providerConfig.BaseURL == "" {
288			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id)
289			c.Providers.Del(id)
290			continue
291		}
292		if len(providerConfig.Models) == 0 {
293			slog.Warn("Skipping custom provider because the provider has no models", "provider", id)
294			c.Providers.Del(id)
295			continue
296		}
297		apiKey, err := resolver.ResolveValue(providerConfig.APIKey)
298		if apiKey == "" || err != nil {
299			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
300		}
301		baseURL, err := resolver.ResolveValue(providerConfig.BaseURL)
302		if baseURL == "" || err != nil {
303			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id, "error", err)
304			c.Providers.Del(id)
305			continue
306		}
307
308		c.Providers.Set(id, providerConfig)
309	}
310	return nil
311}
312
313func (c *Config) setDefaults(workingDir, dataDir string) {
314	c.workingDir = workingDir
315	if c.Options == nil {
316		c.Options = &Options{}
317	}
318	if c.Options.TUI == nil {
319		c.Options.TUI = &TUIOptions{}
320	}
321	if c.Options.ContextPaths == nil {
322		c.Options.ContextPaths = []string{}
323	}
324	if dataDir != "" {
325		c.Options.DataDirectory = dataDir
326	} else if c.Options.DataDirectory == "" {
327		if path, ok := fsext.LookupClosest(workingDir, defaultDataDirectory); ok {
328			c.Options.DataDirectory = path
329		} else {
330			c.Options.DataDirectory = filepath.Join(workingDir, defaultDataDirectory)
331		}
332	}
333	if c.Providers == nil {
334		c.Providers = csync.NewMap[string, ProviderConfig]()
335	}
336	if c.Models == nil {
337		c.Models = make(map[SelectedModelType]SelectedModel)
338	}
339	if c.RecentModels == nil {
340		c.RecentModels = make(map[SelectedModelType][]SelectedModel)
341	}
342	if c.MCP == nil {
343		c.MCP = make(map[string]MCPConfig)
344	}
345	if c.LSP == nil {
346		c.LSP = make(map[string]LSPConfig)
347	}
348
349	// Apply defaults to LSP configurations
350	c.applyLSPDefaults()
351
352	// Add the default context paths if they are not already present
353	c.Options.ContextPaths = append(defaultContextPaths, c.Options.ContextPaths...)
354	slices.Sort(c.Options.ContextPaths)
355	c.Options.ContextPaths = slices.Compact(c.Options.ContextPaths)
356
357	if str, ok := os.LookupEnv("CRUSH_DISABLE_PROVIDER_AUTO_UPDATE"); ok {
358		c.Options.DisableProviderAutoUpdate, _ = strconv.ParseBool(str)
359	}
360
361	if c.Options.Attribution == nil {
362		c.Options.Attribution = &Attribution{
363			TrailerStyle:  TrailerStyleAssistedBy,
364			GeneratedWith: true,
365		}
366	} else if c.Options.Attribution.TrailerStyle == "" {
367		// Migrate deprecated co_authored_by or apply default
368		if c.Options.Attribution.CoAuthoredBy != nil {
369			if *c.Options.Attribution.CoAuthoredBy {
370				c.Options.Attribution.TrailerStyle = TrailerStyleCoAuthoredBy
371			} else {
372				c.Options.Attribution.TrailerStyle = TrailerStyleNone
373			}
374		} else {
375			c.Options.Attribution.TrailerStyle = TrailerStyleAssistedBy
376		}
377	}
378	if c.Options.InitializeAs == "" {
379		c.Options.InitializeAs = defaultInitializeAs
380	}
381}
382
383// applyLSPDefaults applies default values from powernap to LSP configurations
384func (c *Config) applyLSPDefaults() {
385	// Get powernap's default configuration
386	configManager := powernapConfig.NewManager()
387	configManager.LoadDefaults()
388
389	// Apply defaults to each LSP configuration
390	for name, cfg := range c.LSP {
391		// Try to get defaults from powernap based on name or command name.
392		base, ok := configManager.GetServer(name)
393		if !ok {
394			base, ok = configManager.GetServer(cfg.Command)
395			if !ok {
396				continue
397			}
398		}
399		if cfg.Options == nil {
400			cfg.Options = base.Settings
401		}
402		if cfg.InitOptions == nil {
403			cfg.InitOptions = base.InitOptions
404		}
405		if len(cfg.FileTypes) == 0 {
406			cfg.FileTypes = base.FileTypes
407		}
408		if len(cfg.RootMarkers) == 0 {
409			cfg.RootMarkers = base.RootMarkers
410		}
411		if cfg.Command == "" {
412			cfg.Command = base.Command
413		}
414		if len(cfg.Args) == 0 {
415			cfg.Args = base.Args
416		}
417		if len(cfg.Env) == 0 {
418			cfg.Env = base.Environment
419		}
420		// Update the config in the map
421		c.LSP[name] = cfg
422	}
423}
424
425func (c *Config) defaultModelSelection(knownProviders []catwalk.Provider) (largeModel SelectedModel, smallModel SelectedModel, err error) {
426	if len(knownProviders) == 0 && c.Providers.Len() == 0 {
427		err = fmt.Errorf("no providers configured, please configure at least one provider")
428		return largeModel, smallModel, err
429	}
430
431	// Use the first provider enabled based on the known providers order
432	// if no provider found that is known use the first provider configured
433	for _, p := range knownProviders {
434		providerConfig, ok := c.Providers.Get(string(p.ID))
435		if !ok || providerConfig.Disable {
436			continue
437		}
438		defaultLargeModel := c.GetModel(string(p.ID), p.DefaultLargeModelID)
439		if defaultLargeModel == nil {
440			err = fmt.Errorf("default large model %s not found for provider %s", p.DefaultLargeModelID, p.ID)
441			return largeModel, smallModel, err
442		}
443		largeModel = SelectedModel{
444			Provider:        string(p.ID),
445			Model:           defaultLargeModel.ID,
446			MaxTokens:       defaultLargeModel.DefaultMaxTokens,
447			ReasoningEffort: defaultLargeModel.DefaultReasoningEffort,
448		}
449
450		defaultSmallModel := c.GetModel(string(p.ID), p.DefaultSmallModelID)
451		if defaultSmallModel == nil {
452			err = fmt.Errorf("default small model %s not found for provider %s", p.DefaultSmallModelID, p.ID)
453			return largeModel, smallModel, err
454		}
455		smallModel = SelectedModel{
456			Provider:        string(p.ID),
457			Model:           defaultSmallModel.ID,
458			MaxTokens:       defaultSmallModel.DefaultMaxTokens,
459			ReasoningEffort: defaultSmallModel.DefaultReasoningEffort,
460		}
461		return largeModel, smallModel, err
462	}
463
464	enabledProviders := c.EnabledProviders()
465	slices.SortFunc(enabledProviders, func(a, b ProviderConfig) int {
466		return strings.Compare(a.ID, b.ID)
467	})
468
469	if len(enabledProviders) == 0 {
470		err = fmt.Errorf("no providers configured, please configure at least one provider")
471		return largeModel, smallModel, err
472	}
473
474	providerConfig := enabledProviders[0]
475	if len(providerConfig.Models) == 0 {
476		err = fmt.Errorf("provider %s has no models configured", providerConfig.ID)
477		return largeModel, smallModel, err
478	}
479	defaultLargeModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
480	largeModel = SelectedModel{
481		Provider:  providerConfig.ID,
482		Model:     defaultLargeModel.ID,
483		MaxTokens: defaultLargeModel.DefaultMaxTokens,
484	}
485	defaultSmallModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
486	smallModel = SelectedModel{
487		Provider:  providerConfig.ID,
488		Model:     defaultSmallModel.ID,
489		MaxTokens: defaultSmallModel.DefaultMaxTokens,
490	}
491	return largeModel, smallModel, err
492}
493
494func (c *Config) configureSelectedModels(knownProviders []catwalk.Provider) error {
495	defaultLarge, defaultSmall, err := c.defaultModelSelection(knownProviders)
496	if err != nil {
497		return fmt.Errorf("failed to select default models: %w", err)
498	}
499	large, small := defaultLarge, defaultSmall
500
501	largeModelSelected, largeModelConfigured := c.Models[SelectedModelTypeLarge]
502	if largeModelConfigured {
503		if largeModelSelected.Model != "" {
504			large.Model = largeModelSelected.Model
505		}
506		if largeModelSelected.Provider != "" {
507			large.Provider = largeModelSelected.Provider
508		}
509		model := c.GetModel(large.Provider, large.Model)
510		if model == nil {
511			large = defaultLarge
512			// override the model type to large
513			err := c.UpdatePreferredModel(SelectedModelTypeLarge, large)
514			if err != nil {
515				return fmt.Errorf("failed to update preferred large model: %w", err)
516			}
517		} else {
518			if largeModelSelected.MaxTokens > 0 {
519				large.MaxTokens = largeModelSelected.MaxTokens
520			} else {
521				large.MaxTokens = model.DefaultMaxTokens
522			}
523			if largeModelSelected.ReasoningEffort != "" {
524				large.ReasoningEffort = largeModelSelected.ReasoningEffort
525			}
526			large.Think = largeModelSelected.Think
527			if largeModelSelected.Temperature != nil {
528				large.Temperature = largeModelSelected.Temperature
529			}
530			if largeModelSelected.TopP != nil {
531				large.TopP = largeModelSelected.TopP
532			}
533			if largeModelSelected.TopK != nil {
534				large.TopK = largeModelSelected.TopK
535			}
536			if largeModelSelected.FrequencyPenalty != nil {
537				large.FrequencyPenalty = largeModelSelected.FrequencyPenalty
538			}
539			if largeModelSelected.PresencePenalty != nil {
540				large.PresencePenalty = largeModelSelected.PresencePenalty
541			}
542		}
543	}
544	smallModelSelected, smallModelConfigured := c.Models[SelectedModelTypeSmall]
545	if smallModelConfigured {
546		if smallModelSelected.Model != "" {
547			small.Model = smallModelSelected.Model
548		}
549		if smallModelSelected.Provider != "" {
550			small.Provider = smallModelSelected.Provider
551		}
552
553		model := c.GetModel(small.Provider, small.Model)
554		if model == nil {
555			small = defaultSmall
556			// override the model type to small
557			err := c.UpdatePreferredModel(SelectedModelTypeSmall, small)
558			if err != nil {
559				return fmt.Errorf("failed to update preferred small model: %w", err)
560			}
561		} else {
562			if smallModelSelected.MaxTokens > 0 {
563				small.MaxTokens = smallModelSelected.MaxTokens
564			} else {
565				small.MaxTokens = model.DefaultMaxTokens
566			}
567			if smallModelSelected.ReasoningEffort != "" {
568				small.ReasoningEffort = smallModelSelected.ReasoningEffort
569			}
570			if smallModelSelected.Temperature != nil {
571				small.Temperature = smallModelSelected.Temperature
572			}
573			if smallModelSelected.TopP != nil {
574				small.TopP = smallModelSelected.TopP
575			}
576			if smallModelSelected.TopK != nil {
577				small.TopK = smallModelSelected.TopK
578			}
579			if smallModelSelected.FrequencyPenalty != nil {
580				small.FrequencyPenalty = smallModelSelected.FrequencyPenalty
581			}
582			if smallModelSelected.PresencePenalty != nil {
583				small.PresencePenalty = smallModelSelected.PresencePenalty
584			}
585			small.Think = smallModelSelected.Think
586		}
587	}
588	c.Models[SelectedModelTypeLarge] = large
589	c.Models[SelectedModelTypeSmall] = small
590	return nil
591}
592
593// lookupConfigs searches config files recursively from CWD up to FS root
594func lookupConfigs(cwd string) []string {
595	// prepend default config paths
596	configPaths := []string{
597		GlobalConfig(),
598		GlobalConfigData(),
599	}
600
601	configNames := []string{appName + ".json", "." + appName + ".json"}
602
603	foundConfigs, err := fsext.Lookup(cwd, configNames...)
604	if err != nil {
605		// returns at least default configs
606		return configPaths
607	}
608
609	// reverse order so last config has more priority
610	slices.Reverse(foundConfigs)
611
612	return append(configPaths, foundConfigs...)
613}
614
615func loadFromConfigPaths(configPaths []string) (*Config, error) {
616	var configs []io.Reader
617
618	for _, path := range configPaths {
619		fd, err := os.Open(path)
620		if err != nil {
621			if os.IsNotExist(err) {
622				continue
623			}
624			return nil, fmt.Errorf("failed to open config file %s: %w", path, err)
625		}
626		defer fd.Close()
627
628		configs = append(configs, fd)
629	}
630
631	return loadFromReaders(configs)
632}
633
634func loadFromReaders(readers []io.Reader) (*Config, error) {
635	if len(readers) == 0 {
636		return &Config{}, nil
637	}
638
639	merged, err := Merge(readers)
640	if err != nil {
641		return nil, fmt.Errorf("failed to merge configuration readers: %w", err)
642	}
643
644	return LoadReader(merged)
645}
646
647func hasVertexCredentials(env env.Env) bool {
648	hasProject := env.Get("VERTEXAI_PROJECT") != ""
649	hasLocation := env.Get("VERTEXAI_LOCATION") != ""
650	return hasProject && hasLocation
651}
652
653func hasAWSCredentials(env env.Env) bool {
654	if env.Get("AWS_BEARER_TOKEN_BEDROCK") != "" {
655		return true
656	}
657
658	if env.Get("AWS_ACCESS_KEY_ID") != "" && env.Get("AWS_SECRET_ACCESS_KEY") != "" {
659		return true
660	}
661
662	if env.Get("AWS_PROFILE") != "" || env.Get("AWS_DEFAULT_PROFILE") != "" {
663		return true
664	}
665
666	if env.Get("AWS_REGION") != "" || env.Get("AWS_DEFAULT_REGION") != "" {
667		return true
668	}
669
670	if env.Get("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI") != "" ||
671		env.Get("AWS_CONTAINER_CREDENTIALS_FULL_URI") != "" {
672		return true
673	}
674
675	if _, err := os.Stat(filepath.Join(home.Dir(), ".aws/credentials")); err == nil {
676		return true
677	}
678
679	return false
680}
681
682// GlobalConfig returns the global configuration file path for the application.
683func GlobalConfig() string {
684	xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
685	if xdgConfigHome != "" {
686		return filepath.Join(xdgConfigHome, appName, fmt.Sprintf("%s.json", appName))
687	}
688
689	return filepath.Join(home.Dir(), ".config", appName, fmt.Sprintf("%s.json", appName))
690}
691
692// GlobalConfigData returns the path to the main data directory for the application.
693// this config is used when the app overrides configurations instead of updating the global config.
694func GlobalConfigData() string {
695	xdgDataHome := os.Getenv("XDG_DATA_HOME")
696	if xdgDataHome != "" {
697		return filepath.Join(xdgDataHome, appName, fmt.Sprintf("%s.json", appName))
698	}
699
700	// return the path to the main data directory
701	// for windows, it should be in `%LOCALAPPDATA%/crush/`
702	// for linux and macOS, it should be in `$HOME/.local/share/crush/`
703	if runtime.GOOS == "windows" {
704		localAppData := os.Getenv("LOCALAPPDATA")
705		if localAppData == "" {
706			localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
707		}
708		return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
709	}
710
711	return filepath.Join(home.Dir(), ".local", "share", appName, fmt.Sprintf("%s.json", appName))
712}
713
714func assignIfNil[T any](ptr **T, val T) {
715	if *ptr == nil {
716		*ptr = &val
717	}
718}
719
720func isInsideWorktree() bool {
721	bts, err := exec.CommandContext(
722		context.Background(),
723		"git", "rev-parse",
724		"--is-inside-work-tree",
725	).CombinedOutput()
726	return err == nil && strings.TrimSpace(string(bts)) == "true"
727}