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	// Validate hooks configuration.
 85	if err := cfg.validateHooks(); err != nil {
 86		return nil, fmt.Errorf("invalid hooks configuration: %w", err)
 87	}
 88
 89	env := env.New()
 90	// Configure providers
 91	valueResolver := NewShellVariableResolver(env)
 92	cfg.resolver = valueResolver
 93	if err := cfg.configureProviders(env, valueResolver, cfg.knownProviders); err != nil {
 94		return nil, fmt.Errorf("failed to configure providers: %w", err)
 95	}
 96
 97	if !cfg.IsConfigured() {
 98		slog.Warn("No providers configured")
 99		return cfg, nil
100	}
101
102	if err := cfg.configureSelectedModels(cfg.knownProviders); err != nil {
103		return nil, fmt.Errorf("failed to configure selected models: %w", err)
104	}
105	cfg.SetupAgents()
106	return cfg, nil
107}
108
109func PushPopCrushEnv() func() {
110	found := []string{}
111	for _, ev := range os.Environ() {
112		if strings.HasPrefix(ev, "CRUSH_") {
113			pair := strings.SplitN(ev, "=", 2)
114			if len(pair) != 2 {
115				continue
116			}
117			found = append(found, strings.TrimPrefix(pair[0], "CRUSH_"))
118		}
119	}
120	backups := make(map[string]string)
121	for _, ev := range found {
122		backups[ev] = os.Getenv(ev)
123	}
124
125	for _, ev := range found {
126		os.Setenv(ev, os.Getenv("CRUSH_"+ev))
127	}
128
129	restore := func() {
130		for k, v := range backups {
131			os.Setenv(k, v)
132		}
133	}
134	return restore
135}
136
137func (c *Config) configureProviders(env env.Env, resolver VariableResolver, knownProviders []catwalk.Provider) error {
138	knownProviderNames := make(map[string]bool)
139	restore := PushPopCrushEnv()
140	defer restore()
141	for _, p := range knownProviders {
142		knownProviderNames[string(p.ID)] = true
143		config, configExists := c.Providers.Get(string(p.ID))
144		// if the user configured a known provider we need to allow it to override a couple of parameters
145		if configExists {
146			if config.BaseURL != "" {
147				p.APIEndpoint = config.BaseURL
148			}
149			if config.APIKey != "" {
150				p.APIKey = config.APIKey
151			}
152			if len(config.Models) > 0 {
153				models := []catwalk.Model{}
154				seen := make(map[string]bool)
155
156				for _, model := range config.Models {
157					if seen[model.ID] {
158						continue
159					}
160					seen[model.ID] = true
161					if model.Name == "" {
162						model.Name = model.ID
163					}
164					models = append(models, model)
165				}
166				for _, model := range p.Models {
167					if seen[model.ID] {
168						continue
169					}
170					seen[model.ID] = true
171					if model.Name == "" {
172						model.Name = model.ID
173					}
174					models = append(models, model)
175				}
176
177				p.Models = models
178			}
179		}
180
181		headers := map[string]string{}
182		if len(p.DefaultHeaders) > 0 {
183			maps.Copy(headers, p.DefaultHeaders)
184		}
185		if len(config.ExtraHeaders) > 0 {
186			maps.Copy(headers, config.ExtraHeaders)
187		}
188		prepared := ProviderConfig{
189			ID:                 string(p.ID),
190			Name:               p.Name,
191			BaseURL:            p.APIEndpoint,
192			APIKey:             p.APIKey,
193			Type:               p.Type,
194			Disable:            config.Disable,
195			SystemPromptPrefix: config.SystemPromptPrefix,
196			ExtraHeaders:       headers,
197			ExtraBody:          config.ExtraBody,
198			ExtraParams:        make(map[string]string),
199			Models:             p.Models,
200		}
201
202		switch p.ID {
203		// Handle specific providers that require additional configuration
204		case catwalk.InferenceProviderVertexAI:
205			if !hasVertexCredentials(env) {
206				if configExists {
207					slog.Warn("Skipping Vertex AI provider due to missing credentials")
208					c.Providers.Del(string(p.ID))
209				}
210				continue
211			}
212			prepared.ExtraParams["project"] = env.Get("VERTEXAI_PROJECT")
213			prepared.ExtraParams["location"] = env.Get("VERTEXAI_LOCATION")
214		case catwalk.InferenceProviderAzure:
215			endpoint, err := resolver.ResolveValue(p.APIEndpoint)
216			if err != nil || endpoint == "" {
217				if configExists {
218					slog.Warn("Skipping Azure provider due to missing API endpoint", "provider", p.ID, "error", err)
219					c.Providers.Del(string(p.ID))
220				}
221				continue
222			}
223			prepared.BaseURL = endpoint
224			prepared.ExtraParams["apiVersion"] = env.Get("AZURE_OPENAI_API_VERSION")
225		case catwalk.InferenceProviderBedrock:
226			if !hasAWSCredentials(env) {
227				if configExists {
228					slog.Warn("Skipping Bedrock provider due to missing AWS credentials")
229					c.Providers.Del(string(p.ID))
230				}
231				continue
232			}
233			prepared.ExtraParams["region"] = env.Get("AWS_REGION")
234			if prepared.ExtraParams["region"] == "" {
235				prepared.ExtraParams["region"] = env.Get("AWS_DEFAULT_REGION")
236			}
237			for _, model := range p.Models {
238				if !strings.HasPrefix(model.ID, "anthropic.") {
239					return fmt.Errorf("bedrock provider only supports anthropic models for now, found: %s", model.ID)
240				}
241			}
242		default:
243			// if the provider api or endpoint are missing we skip them
244			v, err := resolver.ResolveValue(p.APIKey)
245			if v == "" || err != nil {
246				if configExists {
247					slog.Warn("Skipping provider due to missing API key", "provider", p.ID)
248					c.Providers.Del(string(p.ID))
249				}
250				continue
251			}
252		}
253		c.Providers.Set(string(p.ID), prepared)
254	}
255
256	// validate the custom providers
257	for id, providerConfig := range c.Providers.Seq2() {
258		if knownProviderNames[id] {
259			continue
260		}
261
262		// Make sure the provider ID is set
263		providerConfig.ID = id
264		if providerConfig.Name == "" {
265			providerConfig.Name = id // Use ID as name if not set
266		}
267		// default to OpenAI if not set
268		if providerConfig.Type == "" {
269			providerConfig.Type = catwalk.TypeOpenAICompat
270		}
271		if !slices.Contains(catwalk.KnownProviderTypes(), providerConfig.Type) {
272			slog.Warn("Skipping custom provider due to unsupported provider type", "provider", id)
273			c.Providers.Del(id)
274			continue
275		}
276
277		if providerConfig.Disable {
278			slog.Debug("Skipping custom provider due to disable flag", "provider", id)
279			c.Providers.Del(id)
280			continue
281		}
282		if providerConfig.APIKey == "" {
283			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
284		}
285		if providerConfig.BaseURL == "" {
286			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id)
287			c.Providers.Del(id)
288			continue
289		}
290		if len(providerConfig.Models) == 0 {
291			slog.Warn("Skipping custom provider because the provider has no models", "provider", id)
292			c.Providers.Del(id)
293			continue
294		}
295		apiKey, err := resolver.ResolveValue(providerConfig.APIKey)
296		if apiKey == "" || err != nil {
297			slog.Warn("Provider is missing API key, this might be OK for local providers", "provider", id)
298		}
299		baseURL, err := resolver.ResolveValue(providerConfig.BaseURL)
300		if baseURL == "" || err != nil {
301			slog.Warn("Skipping custom provider due to missing API endpoint", "provider", id, "error", err)
302			c.Providers.Del(id)
303			continue
304		}
305
306		c.Providers.Set(id, providerConfig)
307	}
308	return nil
309}
310
311func (c *Config) setDefaults(workingDir, dataDir string) {
312	c.workingDir = workingDir
313	if c.Options == nil {
314		c.Options = &Options{}
315	}
316	if c.Options.TUI == nil {
317		c.Options.TUI = &TUIOptions{}
318	}
319	if c.Options.ContextPaths == nil {
320		c.Options.ContextPaths = []string{}
321	}
322	if dataDir != "" {
323		c.Options.DataDirectory = dataDir
324	} else if c.Options.DataDirectory == "" {
325		if path, ok := fsext.LookupClosest(workingDir, defaultDataDirectory); ok {
326			c.Options.DataDirectory = path
327		} else {
328			c.Options.DataDirectory = filepath.Join(workingDir, defaultDataDirectory)
329		}
330	}
331	if c.Providers == nil {
332		c.Providers = csync.NewMap[string, ProviderConfig]()
333	}
334	if c.Models == nil {
335		c.Models = make(map[SelectedModelType]SelectedModel)
336	}
337	if c.RecentModels == nil {
338		c.RecentModels = make(map[SelectedModelType][]SelectedModel)
339	}
340	if c.MCP == nil {
341		c.MCP = make(map[string]MCPConfig)
342	}
343	if c.LSP == nil {
344		c.LSP = make(map[string]LSPConfig)
345	}
346
347	// Apply defaults to LSP configurations
348	c.applyLSPDefaults()
349
350	// Add the default context paths if they are not already present
351	c.Options.ContextPaths = append(defaultContextPaths, c.Options.ContextPaths...)
352	slices.Sort(c.Options.ContextPaths)
353	c.Options.ContextPaths = slices.Compact(c.Options.ContextPaths)
354
355	if str, ok := os.LookupEnv("CRUSH_DISABLE_PROVIDER_AUTO_UPDATE"); ok {
356		c.Options.DisableProviderAutoUpdate, _ = strconv.ParseBool(str)
357	}
358
359	if c.Options.Attribution == nil {
360		c.Options.Attribution = &Attribution{
361			TrailerStyle:  TrailerStyleCoAuthoredBy,
362			GeneratedWith: true,
363		}
364	} else if c.Options.Attribution.TrailerStyle == "" {
365		// Migrate deprecated co_authored_by or apply default
366		if c.Options.Attribution.CoAuthoredBy != nil && !*c.Options.Attribution.CoAuthoredBy {
367			c.Options.Attribution.TrailerStyle = TrailerStyleNone
368		} else {
369			c.Options.Attribution.TrailerStyle = TrailerStyleCoAuthoredBy
370		}
371	}
372	if c.Options.InitializeAs == "" {
373		c.Options.InitializeAs = defaultInitializeAs
374	}
375}
376
377// applyLSPDefaults applies default values from powernap to LSP configurations
378func (c *Config) applyLSPDefaults() {
379	// Get powernap's default configuration
380	configManager := powernapConfig.NewManager()
381	configManager.LoadDefaults()
382
383	// Apply defaults to each LSP configuration
384	for name, cfg := range c.LSP {
385		// Try to get defaults from powernap based on name or command name.
386		base, ok := configManager.GetServer(name)
387		if !ok {
388			base, ok = configManager.GetServer(cfg.Command)
389			if !ok {
390				continue
391			}
392		}
393		if cfg.Options == nil {
394			cfg.Options = base.Settings
395		}
396		if cfg.InitOptions == nil {
397			cfg.InitOptions = base.InitOptions
398		}
399		if len(cfg.FileTypes) == 0 {
400			cfg.FileTypes = base.FileTypes
401		}
402		if len(cfg.RootMarkers) == 0 {
403			cfg.RootMarkers = base.RootMarkers
404		}
405		if cfg.Command == "" {
406			cfg.Command = base.Command
407		}
408		if len(cfg.Args) == 0 {
409			cfg.Args = base.Args
410		}
411		if len(cfg.Env) == 0 {
412			cfg.Env = base.Environment
413		}
414		// Update the config in the map
415		c.LSP[name] = cfg
416	}
417}
418
419func (c *Config) defaultModelSelection(knownProviders []catwalk.Provider) (largeModel SelectedModel, smallModel SelectedModel, err error) {
420	if len(knownProviders) == 0 && c.Providers.Len() == 0 {
421		err = fmt.Errorf("no providers configured, please configure at least one provider")
422		return largeModel, smallModel, err
423	}
424
425	// Use the first provider enabled based on the known providers order
426	// if no provider found that is known use the first provider configured
427	for _, p := range knownProviders {
428		providerConfig, ok := c.Providers.Get(string(p.ID))
429		if !ok || providerConfig.Disable {
430			continue
431		}
432		defaultLargeModel := c.GetModel(string(p.ID), p.DefaultLargeModelID)
433		if defaultLargeModel == nil {
434			err = fmt.Errorf("default large model %s not found for provider %s", p.DefaultLargeModelID, p.ID)
435			return largeModel, smallModel, err
436		}
437		largeModel = SelectedModel{
438			Provider:        string(p.ID),
439			Model:           defaultLargeModel.ID,
440			MaxTokens:       defaultLargeModel.DefaultMaxTokens,
441			ReasoningEffort: defaultLargeModel.DefaultReasoningEffort,
442		}
443
444		defaultSmallModel := c.GetModel(string(p.ID), p.DefaultSmallModelID)
445		if defaultSmallModel == nil {
446			err = fmt.Errorf("default small model %s not found for provider %s", p.DefaultSmallModelID, p.ID)
447			return largeModel, smallModel, err
448		}
449		smallModel = SelectedModel{
450			Provider:        string(p.ID),
451			Model:           defaultSmallModel.ID,
452			MaxTokens:       defaultSmallModel.DefaultMaxTokens,
453			ReasoningEffort: defaultSmallModel.DefaultReasoningEffort,
454		}
455		return largeModel, smallModel, err
456	}
457
458	enabledProviders := c.EnabledProviders()
459	slices.SortFunc(enabledProviders, func(a, b ProviderConfig) int {
460		return strings.Compare(a.ID, b.ID)
461	})
462
463	if len(enabledProviders) == 0 {
464		err = fmt.Errorf("no providers configured, please configure at least one provider")
465		return largeModel, smallModel, err
466	}
467
468	providerConfig := enabledProviders[0]
469	if len(providerConfig.Models) == 0 {
470		err = fmt.Errorf("provider %s has no models configured", providerConfig.ID)
471		return largeModel, smallModel, err
472	}
473	defaultLargeModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
474	largeModel = SelectedModel{
475		Provider:  providerConfig.ID,
476		Model:     defaultLargeModel.ID,
477		MaxTokens: defaultLargeModel.DefaultMaxTokens,
478	}
479	defaultSmallModel := c.GetModel(providerConfig.ID, providerConfig.Models[0].ID)
480	smallModel = SelectedModel{
481		Provider:  providerConfig.ID,
482		Model:     defaultSmallModel.ID,
483		MaxTokens: defaultSmallModel.DefaultMaxTokens,
484	}
485	return largeModel, smallModel, err
486}
487
488func (c *Config) configureSelectedModels(knownProviders []catwalk.Provider) error {
489	defaultLarge, defaultSmall, err := c.defaultModelSelection(knownProviders)
490	if err != nil {
491		return fmt.Errorf("failed to select default models: %w", err)
492	}
493	large, small := defaultLarge, defaultSmall
494
495	largeModelSelected, largeModelConfigured := c.Models[SelectedModelTypeLarge]
496	if largeModelConfigured {
497		if largeModelSelected.Model != "" {
498			large.Model = largeModelSelected.Model
499		}
500		if largeModelSelected.Provider != "" {
501			large.Provider = largeModelSelected.Provider
502		}
503		model := c.GetModel(large.Provider, large.Model)
504		if model == nil {
505			large = defaultLarge
506			// override the model type to large
507			err := c.UpdatePreferredModel(SelectedModelTypeLarge, large)
508			if err != nil {
509				return fmt.Errorf("failed to update preferred large model: %w", err)
510			}
511		} else {
512			if largeModelSelected.MaxTokens > 0 {
513				large.MaxTokens = largeModelSelected.MaxTokens
514			} else {
515				large.MaxTokens = model.DefaultMaxTokens
516			}
517			if largeModelSelected.ReasoningEffort != "" {
518				large.ReasoningEffort = largeModelSelected.ReasoningEffort
519			}
520			large.Think = largeModelSelected.Think
521			if largeModelSelected.Temperature != nil {
522				large.Temperature = largeModelSelected.Temperature
523			}
524			if largeModelSelected.TopP != nil {
525				large.TopP = largeModelSelected.TopP
526			}
527			if largeModelSelected.TopK != nil {
528				large.TopK = largeModelSelected.TopK
529			}
530			if largeModelSelected.FrequencyPenalty != nil {
531				large.FrequencyPenalty = largeModelSelected.FrequencyPenalty
532			}
533			if largeModelSelected.PresencePenalty != nil {
534				large.PresencePenalty = largeModelSelected.PresencePenalty
535			}
536		}
537	}
538	smallModelSelected, smallModelConfigured := c.Models[SelectedModelTypeSmall]
539	if smallModelConfigured {
540		if smallModelSelected.Model != "" {
541			small.Model = smallModelSelected.Model
542		}
543		if smallModelSelected.Provider != "" {
544			small.Provider = smallModelSelected.Provider
545		}
546
547		model := c.GetModel(small.Provider, small.Model)
548		if model == nil {
549			small = defaultSmall
550			// override the model type to small
551			err := c.UpdatePreferredModel(SelectedModelTypeSmall, small)
552			if err != nil {
553				return fmt.Errorf("failed to update preferred small model: %w", err)
554			}
555		} else {
556			if smallModelSelected.MaxTokens > 0 {
557				small.MaxTokens = smallModelSelected.MaxTokens
558			} else {
559				small.MaxTokens = model.DefaultMaxTokens
560			}
561			if smallModelSelected.ReasoningEffort != "" {
562				small.ReasoningEffort = smallModelSelected.ReasoningEffort
563			}
564			if smallModelSelected.Temperature != nil {
565				small.Temperature = smallModelSelected.Temperature
566			}
567			if smallModelSelected.TopP != nil {
568				small.TopP = smallModelSelected.TopP
569			}
570			if smallModelSelected.TopK != nil {
571				small.TopK = smallModelSelected.TopK
572			}
573			if smallModelSelected.FrequencyPenalty != nil {
574				small.FrequencyPenalty = smallModelSelected.FrequencyPenalty
575			}
576			if smallModelSelected.PresencePenalty != nil {
577				small.PresencePenalty = smallModelSelected.PresencePenalty
578			}
579			small.Think = smallModelSelected.Think
580		}
581	}
582	c.Models[SelectedModelTypeLarge] = large
583	c.Models[SelectedModelTypeSmall] = small
584	return nil
585}
586
587// lookupConfigs searches config files recursively from CWD up to FS root
588func lookupConfigs(cwd string) []string {
589	// prepend default config paths
590	configPaths := []string{
591		GlobalConfig(),
592		GlobalConfigData(),
593	}
594
595	configNames := []string{appName + ".json", "." + appName + ".json"}
596
597	foundConfigs, err := fsext.Lookup(cwd, configNames...)
598	if err != nil {
599		// returns at least default configs
600		return configPaths
601	}
602
603	// reverse order so last config has more priority
604	slices.Reverse(foundConfigs)
605
606	return append(configPaths, foundConfigs...)
607}
608
609func loadFromConfigPaths(configPaths []string) (*Config, error) {
610	var configs []io.Reader
611
612	for _, path := range configPaths {
613		fd, err := os.Open(path)
614		if err != nil {
615			if os.IsNotExist(err) {
616				continue
617			}
618			return nil, fmt.Errorf("failed to open config file %s: %w", path, err)
619		}
620		defer fd.Close()
621
622		configs = append(configs, fd)
623	}
624
625	return loadFromReaders(configs)
626}
627
628func loadFromReaders(readers []io.Reader) (*Config, error) {
629	if len(readers) == 0 {
630		return &Config{}, nil
631	}
632
633	merged, err := Merge(readers)
634	if err != nil {
635		return nil, fmt.Errorf("failed to merge configuration readers: %w", err)
636	}
637
638	return LoadReader(merged)
639}
640
641func hasVertexCredentials(env env.Env) bool {
642	hasProject := env.Get("VERTEXAI_PROJECT") != ""
643	hasLocation := env.Get("VERTEXAI_LOCATION") != ""
644	return hasProject && hasLocation
645}
646
647func hasAWSCredentials(env env.Env) bool {
648	if env.Get("AWS_BEARER_TOKEN_BEDROCK") != "" {
649		return true
650	}
651
652	if env.Get("AWS_ACCESS_KEY_ID") != "" && env.Get("AWS_SECRET_ACCESS_KEY") != "" {
653		return true
654	}
655
656	if env.Get("AWS_PROFILE") != "" || env.Get("AWS_DEFAULT_PROFILE") != "" {
657		return true
658	}
659
660	if env.Get("AWS_REGION") != "" || env.Get("AWS_DEFAULT_REGION") != "" {
661		return true
662	}
663
664	if env.Get("AWS_CONTAINER_CREDENTIALS_RELATIVE_URI") != "" ||
665		env.Get("AWS_CONTAINER_CREDENTIALS_FULL_URI") != "" {
666		return true
667	}
668
669	if _, err := os.Stat(filepath.Join(home.Dir(), ".aws/credentials")); err == nil {
670		return true
671	}
672
673	return false
674}
675
676// GlobalConfig returns the global configuration file path for the application.
677func GlobalConfig() string {
678	xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
679	if xdgConfigHome != "" {
680		return filepath.Join(xdgConfigHome, appName, fmt.Sprintf("%s.json", appName))
681	}
682
683	return filepath.Join(home.Dir(), ".config", appName, fmt.Sprintf("%s.json", appName))
684}
685
686// GlobalConfigData returns the path to the main data directory for the application.
687// this config is used when the app overrides configurations instead of updating the global config.
688func GlobalConfigData() string {
689	xdgDataHome := os.Getenv("XDG_DATA_HOME")
690	if xdgDataHome != "" {
691		return filepath.Join(xdgDataHome, appName, fmt.Sprintf("%s.json", appName))
692	}
693
694	// return the path to the main data directory
695	// for windows, it should be in `%LOCALAPPDATA%/crush/`
696	// for linux and macOS, it should be in `$HOME/.local/share/crush/`
697	if runtime.GOOS == "windows" {
698		localAppData := os.Getenv("LOCALAPPDATA")
699		if localAppData == "" {
700			localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
701		}
702		return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
703	}
704
705	return filepath.Join(home.Dir(), ".local", "share", appName, fmt.Sprintf("%s.json", appName))
706}
707
708func assignIfNil[T any](ptr **T, val T) {
709	if *ptr == nil {
710		*ptr = &val
711	}
712}
713
714func isInsideWorktree() bool {
715	bts, err := exec.CommandContext(
716		context.Background(),
717		"git", "rev-parse",
718		"--is-inside-work-tree",
719	).CombinedOutput()
720	return err == nil && strings.TrimSpace(string(bts)) == "true"
721}