feat: add flag app to specific which app to operate

internal/cli/action.go

@@ -11,8 +11,9 @@ import (
 
 type action struct {
 	flags struct {
-		verbose bool
-		dryRun  bool
+		appNames []string
+		verbose  bool
+		dryRun   bool
 	}
 }
 
@@ -27,7 +28,7 @@ func (a *action) runInstall(c *cli.Context) error {
 		return err
 	}
 
-	if err := cfg.Install(); err != nil {
+	if err := cfg.Install(a.flags.appNames...); err != nil {
 		return fmt.Errorf("config: failed to install: %w", err)
 	}
 
@@ -40,7 +41,7 @@ func (a *action) runUpdate(c *cli.Context) error {
 		return err
 	}
 
-	if err := cfg.Update(); err != nil {
+	if err := cfg.Update(a.flags.appNames...); err != nil {
 		return fmt.Errorf("config: failed to update: %w", err)
 	}
 
@@ -53,7 +54,7 @@ func (a *action) runDownload(c *cli.Context) error {
 		return err
 	}
 
-	if err := cfg.Download(); err != nil {
+	if err := cfg.Download(a.flags.appNames...); err != nil {
 		return fmt.Errorf("config: failed to download: %w", err)
 	}
 
@@ -79,7 +80,7 @@ func (a *action) runDiff(c *cli.Context) error {
 		return err
 	}
 
-	if err := cfg.Diff(); err != nil {
+	if err := cfg.Diff(a.flags.appNames...); err != nil {
 		return fmt.Errorf("config: failed to compare: %w", err)
 	}
 
@@ -92,7 +93,7 @@ func (a *action) runValidate(c *cli.Context) error {
 		return err
 	}
 
-	if err := cfg.Validate(); err != nil {
+	if err := cfg.Validate(a.flags.appNames...); err != nil {
 		return fmt.Errorf("config: failed to validate: %w", err)
 	}
 
@@ -119,6 +120,7 @@ func (a *action) loadConfig(c *cli.Context, command string) (config.Config, erro
 func (a *action) getFlags(c *cli.Context) {
 	a.flags.verbose = c.Bool(flagVerboseName)
 	a.flags.dryRun = c.Bool(flagDryRunName)
+	a.flags.appNames = c.StringSlice(flagAppName)
 }
 
 func (a *action) log(format string, v ...interface{}) {

internal/cli/app.go

@@ -38,6 +38,9 @@ const (
 	flagDryRunName  = "dry-run"
 	flagDryRunUsage = "demo mode without actually changing anything"
 
+	flagAppName  = "app"
+	flagAppUsage = "specific app to operate"
+
 	currentDir = "."
 )
 
@@ -80,6 +83,10 @@ func NewApp() *App {
 						Name:  flagDryRunName,
 						Usage: flagDryRunUsage,
 					},
+					&cli.StringFlag{
+						Name:  flagAppName,
+						Usage: flagAppUsage,
+					},
 				},
 				Action: a.runInstall,
 			},
@@ -96,6 +103,10 @@ func NewApp() *App {
 						Name:  flagDryRunName,
 						Usage: flagDryRunUsage,
 					},
+					&cli.StringFlag{
+						Name:  flagAppName,
+						Usage: flagAppUsage,
+					},
 				},
 				Action: a.runUpdate,
 			},
@@ -112,6 +123,10 @@ func NewApp() *App {
 						Name:  flagDryRunName,
 						Usage: flagDryRunUsage,
 					},
+					&cli.StringFlag{
+						Name:  flagAppName,
+						Usage: flagAppUsage,
+					},
 				},
 				Action: a.runDownload,
 			},
@@ -140,6 +155,10 @@ func NewApp() *App {
 						Name:  flagVerboseName,
 						Usage: flagVerboseUsage,
 					},
+					&cli.StringSliceFlag{
+						Name:  flagAppName,
+						Usage: flagAppUsage,
+					},
 				},
 				Action: a.runDiff,
 			},
@@ -152,6 +171,10 @@ func NewApp() *App {
 						Name:  flagVerboseName,
 						Usage: flagVerboseUsage,
 					},
+					&cli.StringFlag{
+						Name:  flagAppName,
+						Usage: flagAppUsage,
+					},
 				},
 				Action: a.runValidate,
 			},

internal/config/config.go

@@ -19,12 +19,12 @@ const (
 var ErrConfigNotFound = errors.New("config not found")
 
 type Config interface {
-	Install() error
-	Update() error
+	Install(appNames ...string) error
+	Update(appNames ...string) error
 	Clean() error
-	Diff() error
-	Download() error
-	Validate() error
+	Diff(appNames ...string) error
+	Download(appNames ...string) error
+	Validate(appNames ...string) error
 }
 
 type ConfigApps struct {
@@ -75,3 +75,12 @@ func loadConfig(bytes []byte, unmarshalFn func(data []byte, v any) error) (*Conf
 
 	return &cfgReal, &cfgDemo, nil
 }
+
+// Helper
+func slice2map(vs []string) map[string]struct{} {
+	m := make(map[string]struct{}, len(vs))
+	for _, v := range vs {
+		m[v] = struct{}{}
+	}
+	return m
+}

internal/config/config_demo.go

@@ -8,8 +8,16 @@ type ConfigDemo struct {
 
 var _ Config = (*ConfigDemo)(nil)
 
-func (c *ConfigDemo) Install() error {
-	for _, app := range c.Apps {
+func (c *ConfigDemo) Install(appNames ...string) error {
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
+
 		for _, p := range app.Paths {
 			if p.External == "" {
 				continue
@@ -22,8 +30,16 @@ func (c *ConfigDemo) Install() error {
 	return nil
 }
 
-func (c *ConfigDemo) Update() error {
-	for _, app := range c.Apps {
+func (c *ConfigDemo) Update(appNames ...string) error {
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
+
 		for _, p := range app.Paths {
 			if p.External == "" {
 				continue
@@ -36,8 +52,16 @@ func (c *ConfigDemo) Update() error {
 	return nil
 }
 
-func (c *ConfigDemo) Download() error {
-	for _, app := range c.Apps {
+func (c *ConfigDemo) Download(appNames ...string) error {
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
+
 		for _, p := range app.Paths {
 			if p.URL == "" {
 				continue
@@ -63,10 +87,10 @@ func (c *ConfigDemo) Clean() error {
 	return nil
 }
 
-func (c *ConfigDemo) Diff() error {
+func (c *ConfigDemo) Diff(_ ...string) error {
 	return nil
 }
 
-func (c *ConfigDemo) Validate() error {
+func (c *ConfigDemo) Validate(_ ...string) error {
 	return nil
 }

internal/config/config_real.go

@@ -23,10 +23,18 @@ type ConfigReal struct {
 var _ Config = (*ConfigReal)(nil)
 
 // Install internal -> external
-func (c *ConfigReal) Install() error {
-	eg := new(errgroup.Group)
+func (c *ConfigReal) Install(appNames ...string) error {
+	var eg errgroup.Group
+
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
 
-	for _, app := range c.Apps {
 		for _, p := range app.Paths {
 			if p.External == "" {
 				continue
@@ -56,10 +64,18 @@ func (c *ConfigReal) Install() error {
 }
 
 // Update external -> internal
-func (c *ConfigReal) Update() error {
-	eg := new(errgroup.Group)
+func (c *ConfigReal) Update(appNames ...string) error {
+	var eg errgroup.Group
+
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
 
-	for _, app := range c.Apps {
 		for _, p := range app.Paths {
 			if p.External == "" {
 				continue
@@ -88,10 +104,18 @@ func (c *ConfigReal) Update() error {
 	return nil
 }
 
-func (c *ConfigReal) Download() error {
-	eg := new(errgroup.Group)
+func (c *ConfigReal) Download(appNames ...string) error {
+	var eg errgroup.Group
+
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
 
-	for _, app := range c.Apps {
 		for _, p := range app.Paths {
 			if p.URL == "" {
 				continue
@@ -184,8 +208,16 @@ func getUnusedDirs(apps map[string]App) (map[string]struct{}, error) {
 	return unusedDirs, nil
 }
 
-func (c *ConfigReal) Diff() error {
-	for _, app := range c.Apps {
+func (c *ConfigReal) Diff(appNames ...string) error {
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
+
 		for _, p := range app.Paths {
 			if p.External == "" {
 				continue
@@ -200,10 +232,18 @@ func (c *ConfigReal) Diff() error {
 	return nil
 }
 
-func (c *ConfigReal) Validate() error {
-	eg := new(errgroup.Group)
+func (c *ConfigReal) Validate(appNames ...string) error {
+	var eg errgroup.Group
+
+	mAppNames := slice2map(appNames)
+
+	for appName, app := range c.Apps {
+		if len(appNames) > 0 {
+			if _, ok := mAppNames[appName]; !ok {
+				continue
+			}
+		}
 
-	for _, app := range c.Apps {
 		for _, p := range app.Paths {
 			app := app
 			p := Path{