Support maintidx

go.mod

@@ -91,6 +91,7 @@ require (
 	github.com/ultraware/whitespace v0.0.4
 	github.com/uudashr/gocognit v1.0.5
 	github.com/valyala/quicktemplate v1.7.0
+	github.com/yagipy/maintidx v1.0.0
 	github.com/yeya24/promlinter v0.1.0
 	golang.org/x/tools v0.1.8
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b

pkg/golinters/maintidx.go

@@ -0,0 +1,20 @@
+package golinters
+
+import (
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
+	"github.com/yagipy/maintidx"
+	"golang.org/x/tools/go/analysis"
+)
+
+func NewMaintIdx() *goanalysis.Linter {
+	analyzers := []*analysis.Analyzer{
+		maintidx.Analyzer,
+	}
+
+	return goanalysis.NewLinter(
+		"maintidx",
+		"maintidx measures the maintainability index of each function.",
+		analyzers,
+		nil,
+	).WithLoadMode(goanalysis.LoadModeTypesInfo)
+}

pkg/lint/lintersdb/manager.go

@@ -555,6 +555,11 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 			WithPresets(linter.PresetBugs).
 			WithLoadForGoAnalysis().
 			WithURL("https://github.com/breml/errchkjson"),
+		linter.NewConfig(golinters.NewMaintIdx()).
+			WithSince("v1.1.0").
+			WithPresets(linter.PresetComplexity).
+			WithLoadForGoAnalysis().
+			WithURL("https://github.com/yagipy/maintidx"),
 
 		// nolintlint must be last because it looks at the results of all the previous linters for unused nolint directives
 		linter.NewConfig(golinters.NewNoLintLint()).

test/testdata/maintidx.go

@@ -0,0 +1,196 @@
+//args: -Emaintidx
+package testdata
+
+func over20() {
+}
+
+func under20() { // ERROR "Function name: under20, Cyclomatic Complexity: 76, Halstead Volume: 1636.00, Maintainability Index: 17"
+	for true {
+		if false {
+			if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			}
+		} else if false {
+			if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			}
+		} else if false {
+			if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			}
+		} else if false {
+			if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			}
+		} else {
+			if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else if false {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			} else {
+				n := 0
+				switch n {
+				case 0:
+				case 1:
+				default:
+				}
+			}
+		}
+	}
+}