chore: update implementation

Author: ldez

.golangci.next.reference.yml

@@ -1369,6 +1369,9 @@ linters-settings:
     # Forbid the use of the `toolchain` directive.
     # Default: false
     toolchain-forbidden: true
+    # Defines a pattern to validate `toolchain` directive.
+    # Default: '' (no match)
+    toolchain-pattern: 'go1\.23\.\d+$'
     # Forbid the use of the `tool` directives.
     # Default: false
     tool-forbidden: true

jsonschema/golangci.next.jsonschema.json

@@ -1680,6 +1680,10 @@
               "type": "boolean",
               "default": false
             },
+            "toolchain-pattern": {
+              "description": "Defines a pattern to validate `toolchain` directive.",
+              "type": "string",
+            },
             "tool-forbidden": {
               "description": "Forbid the use of the `tool` directives.",
               "type": "boolean",

pkg/config/linters_settings.go

@@ -586,6 +586,7 @@ type GoModDirectivesSettings struct {
 	ExcludeForbidden          bool     `mapstructure:"exclude-forbidden"`
 	RetractAllowNoExplanation bool     `mapstructure:"retract-allow-no-explanation"`
 	ToolchainForbidden        bool     `mapstructure:"toolchain-forbidden"`
+	ToolchainPattern          string   `mapstructure:"toolchain-pattern"`
 	ToolForbidden             bool     `mapstructure:"tool-forbidden"`
 	GoDebugForbidden          bool     `mapstructure:"go-debug-forbidden"`
 	GoVersionPattern          string   `mapstructure:"go-version-pattern"`

pkg/golinters/gomoddirectives/gomoddirectives.go

@@ -30,6 +30,15 @@ func New(settings *config.GoModDirectivesSettings) *goanalysis.Linter {
 		opts.ToolForbidden = settings.ToolForbidden
 		opts.GoDebugForbidden = settings.GoDebugForbidden
 
+		if settings.ToolchainPattern != "" {
+			exp, err := regexp.Compile(settings.ToolchainPattern)
+			if err != nil {
+				internal.LinterLogger.Fatalf("%s: invalid toolchain pattern: %v", linterName, err)
+			} else {
+				opts.ToolchainPattern = exp
+			}
+		}
+
 		if settings.GoVersionPattern != "" {
 			exp, err := regexp.Compile(settings.GoVersionPattern)
 			if err != nil {