feat(brew): add cask option

installer/brew_installer.go

@@ -28,6 +28,8 @@ type BrewInstaller struct {
 type BrewOpts struct {
 	// Tap is the Homebrew tap to use for the package.
 	Tap *string
+	// Cask installs the formula as a cask instead of a regular package.
+	Cask *bool
 }
 
 // Validate validates the installer configuration.
@@ -46,13 +48,21 @@ func (i *BrewInstaller) Validate() []ValidationError {
 // Install implements IInstaller.
 func (i *BrewInstaller) Install() error {
 	name := i.GetFullName()
-	return i.RunCmdAsFile(fmt.Sprintf("brew install %s", name))
+	cmd := "brew install"
+	if i.IsCask() {
+		cmd += " --cask"
+	}
+	return i.RunCmdAsFile(fmt.Sprintf("%s %s", cmd, name))
 }
 
 // Update implements IInstaller.
 func (i *BrewInstaller) Update() error {
 	name := i.GetFullName()
-	return i.RunCmdAsFile(fmt.Sprintf("brew upgrade %s", name))
+	cmd := "brew upgrade"
+	if i.IsCask() {
+		cmd += " --cask"
+	}
+	return i.RunCmdAsFile(fmt.Sprintf("%s %s", cmd, name))
 }
 
 // GetFullName returns the full name of the package, including the tap if specified.
@@ -172,10 +182,18 @@ func (i *BrewInstaller) GetOpts() *BrewOpts {
 		if tap, ok := (*info.Opts)["tap"].(string); ok {
 			opts.Tap = &tap
 		}
+		if caskVal, ok := (*info.Opts)["cask"].(bool); ok {
+			opts.Cask = &caskVal
+		}
 	}
 	return opts
 }
 
+func (i *BrewInstaller) IsCask() bool {
+	opts := i.GetOpts()
+	return opts.Cask != nil && *opts.Cask
+}
+
 // GetBinName returns the binary name for the installer.
 // It uses the BinName from the installer data if provided, otherwise it uses the installer name.
 func (i *BrewInstaller) GetBinName() string {

installer/brew_installer_test.go

@@ -37,6 +37,17 @@ func TestBrewValidation(t *testing.T) {
 	}
 	assertNoValidationErrors(t, newTestBrewInstaller(validData).Validate())
 
+	// 🟢 Valid: Tap and cask used together
+	tapCaskData := &appconfig.InstallerData{
+		Name: strPtr("test-brew-tap-cask"),
+		Type: appconfig.InstallerTypeBrew,
+		Opts: &map[string]any{
+			"tap":  "homebrew/cask-versions",
+			"cask": true,
+		},
+	}
+	assertNoValidationErrors(t, newTestBrewInstaller(tapCaskData).Validate())
+
 	// 🔴 Invalid: Tap is present but malformed (missing slash or too short)
 	invalidData := &appconfig.InstallerData{
 		Name: strPtr("test-brew-invalid-tap"),