feat: migration command

Author: ldez

.golangci.yml

@@ -176,6 +176,12 @@ linters:
         linters:
           - lll
 
+      # Related to migration command.
+      - path: pkg/commands/internal/migrate/
+        linters:
+          - gocritic
+        text: "hugeParam:"
+
 formatters:
   enable:
     - gofmt

pkg/commands/internal/migrate/migrate.go

@@ -0,0 +1,19 @@
+package migrate
+
+import (
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/one"
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/ptr"
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/two"
+)
+
+func ToConfig(old *one.Config) *two.Config {
+	return &two.Config{
+		Version:    ptr.Pointer("2"),
+		Linters:    toLinters(old),
+		Formatters: toFormatters(old),
+		Issues:     toIssues(old),
+		Output:     toOutput(old),
+		Severity:   toSeverity(old),
+		Run:        toRun(old),
+	}
+}

pkg/commands/internal/migrate/migrate_formatters.go

@@ -0,0 +1,79 @@
+package migrate
+
+import (
+	"slices"
+	"strings"
+
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/one"
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/ptr"
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/two"
+)
+
+func toFormatters(old *one.Config) two.Formatters {
+	enable, _ := ProcessEffectiveLinters(old.Linters)
+
+	formatterNames := onlyFormatterNames(enable)
+
+	var paths []string
+	if len(formatterNames) != 0 {
+		paths = slices.Concat(old.Issues.ExcludeFiles, old.Issues.ExcludeDirs)
+	}
+
+	return two.Formatters{
+		Enable: formatterNames,
+		Settings: two.FormatterSettings{
+			Gci:       toGciSettings(old.LintersSettings.Gci),
+			GoFmt:     toGoFmtSettings(old.LintersSettings.GoFmt),
+			GoFumpt:   toGoFumptSettings(old.LintersSettings.GoFumpt),
+			GoImports: toGoImportsSettings(old.LintersSettings.GoImports),
+		},
+		Exclusions: two.FormatterExclusions{
+			Generated: toExclusionGenerated(old.Issues.ExcludeGenerated),
+			Paths:     paths,
+		},
+	}
+}
+
+func toGciSettings(old one.GciSettings) two.GciSettings {
+	return two.GciSettings{
+		Sections:         old.Sections,
+		NoInlineComments: old.NoInlineComments,
+		NoPrefixComments: old.NoPrefixComments,
+		CustomOrder:      old.CustomOrder,
+		NoLexOrder:       old.CustomOrder,
+	}
+}
+
+func toGoFmtSettings(old one.GoFmtSettings) two.GoFmtSettings {
+	settings := two.GoFmtSettings{
+		Simplify: old.Simplify,
+	}
+
+	for _, rule := range old.RewriteRules {
+		settings.RewriteRules = append(settings.RewriteRules, two.GoFmtRewriteRule{
+			Pattern:     rule.Pattern,
+			Replacement: rule.Replacement,
+		})
+	}
+
+	return settings
+}
+
+func toGoFumptSettings(old one.GoFumptSettings) two.GoFumptSettings {
+	return two.GoFumptSettings{
+		ModulePath: old.ModulePath,
+		ExtraRules: old.ExtraRules,
+	}
+}
+
+func toGoImportsSettings(old one.GoImportsSettings) two.GoImportsSettings {
+	var localPrefixes []string
+
+	if ptr.Deref(old.LocalPrefixes) != "" {
+		localPrefixes = strings.Split(ptr.Deref(old.LocalPrefixes), ",")
+	}
+
+	return two.GoImportsSettings{
+		LocalPrefixes: localPrefixes,
+	}
+}

pkg/commands/internal/migrate/migrate_issues.go

@@ -0,0 +1,20 @@
+package migrate
+
+import (
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/one"
+	"github.com/golangci/golangci-lint/pkg/commands/internal/migrate/two"
+)
+
+func toIssues(old *one.Config) two.Issues {
+	return two.Issues{
+		MaxIssuesPerLinter: old.Issues.MaxIssuesPerLinter,
+		MaxSameIssues:      old.Issues.MaxSameIssues,
+		UniqByLine:         old.Issues.UniqByLine,
+		DiffFromRevision:   old.Issues.DiffFromRevision,
+		DiffFromMergeBase:  old.Issues.DiffFromMergeBase,
+		DiffPatchFilePath:  old.Issues.DiffPatchFilePath,
+		WholeFiles:         old.Issues.WholeFiles,
+		Diff:               old.Issues.Diff,
+		NeedFix:            old.Issues.NeedFix,
+	}
+}