add nosnakecase lint (golangci#2828)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

go.mod

@@ -155,6 +155,7 @@ require (
 	github.com/quasilyte/gogrep v0.0.0-20220120141003-628d8b3623b5 // indirect
 	github.com/quasilyte/regex/syntax v0.0.0-20200407221936-30656e2c4a95 // indirect
 	github.com/quasilyte/stdinfo v0.0.0-20220114132959-f7386bf02567 // indirect
+	github.com/sivchari/nosnakecase v1.5.0
 	github.com/spf13/afero v1.8.2 // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect

pkg/golinters/nosnakecase.go

@@ -0,0 +1,19 @@
+package golinters
+
+import (
+	"github.com/sivchari/nosnakecase"
+	"golang.org/x/tools/go/analysis"
+
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
+)
+
+func NewNoSnakeCase() *goanalysis.Linter {
+	a := nosnakecase.Analyzer
+
+	return goanalysis.NewLinter(
+		a.Name,
+		a.Doc,
+		[]*analysis.Analyzer{a},
+		nil,
+	).WithLoadMode(goanalysis.LoadModeSyntax)
+}

pkg/lint/lintersdb/manager.go

@@ -631,6 +631,11 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 			WithPresets(linter.PresetStyle).
 			WithURL("https://github.com/firefart/nonamedreturns"),
 
+		linter.NewConfig(golinters.NewNoSnakeCase()).
+			WithSince("v1.47.0").
+			WithPresets(linter.PresetStyle).
+			WithURL("https://github.com/sivchari/nosnakecase"),
+
 		linter.NewConfig(golinters.NewNoSprintfHostPort()).
 			WithSince("v1.46.0").
 			WithPresets(linter.PresetStyle).

test/run_test.go

@@ -95,7 +95,7 @@ func TestTestsAreLintedByDefault(t *testing.T) {
 }
 
 func TestCgoOk(t *testing.T) {
-	testshared.NewLintRunner(t).Run("--no-config", "--enable-all", getTestDataDir("cgo")).ExpectNoIssues()
+	testshared.NewLintRunner(t).Run("--no-config", "--enable-all", "-D", "nosnakecase", getTestDataDir("cgo")).ExpectNoIssues()
 }
 
 func TestCgoWithIssues(t *testing.T) {

test/testdata/nosnakecase.go

@@ -0,0 +1,149 @@
+//args: -Enosnakecase
+package testdata
+
+import (
+	_ "fmt"
+	f_m_t "fmt" // ERROR "f_m_t contains underscore. You should use mixedCap or MixedCap."
+)
+
+// global variable name with underscore.
+var v_v = 0 // ERROR "v_v contains underscore. You should use mixedCap or MixedCap."
+
+// global constant name with underscore.
+const c_c = 0 // ERROR "c_c contains underscore. You should use mixedCap or MixedCap."
+
+// struct name with underscore.
+type S_a struct { // ERROR "S_a contains underscore. You should use mixedCap or MixedCap."
+	fi int
+}
+
+// non-exported struct field name with underscore.
+type Sa struct {
+	fi_a int // // ERROR "fi_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// function as struct field, with parameter name with underscore.
+type Sb struct {
+	fib func(p_a int) // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// exported struct field with underscore.
+type Sc struct {
+	Fi_A int // ERROR "Fi_A contains underscore. You should use mixedCap or MixedCap."
+}
+
+// function as struct field, with return name with underscore.
+type Sd struct {
+	fib func(p int) (r_a int) // ERROR "r_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// interface name with underscore.
+type I_a interface { // ERROR "I_a contains underscore. You should use mixedCap or MixedCap."
+	fn(p int)
+}
+
+// interface with parameter name with underscore.
+type Ia interface {
+	fn(p_a int) // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// interface with parameter name with underscore.
+type Ib interface {
+	Fn(p_a int) // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// function as struct field, with return name with underscore.
+type Ic interface {
+	Fn_a() // ERROR "Fn_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// interface with return name with underscore.
+type Id interface {
+	Fn() (r_a int) // ERROR "r_a contains underscore. You should use mixedCap or MixedCap."
+}
+
+// function name with underscore.
+func f_a() {} // ERROR "f_a contains underscore. You should use mixedCap or MixedCap."
+
+// function's parameter name with underscore.
+func fb(p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+// named return with underscore.
+func fc() (r_b int) { // ERROR "r_b contains underscore. You should use mixedCap or MixedCap."
+	return 0
+}
+
+// local variable (short declaration) with underscore.
+func fd(p int) int {
+	v_b := p * 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+// local constant with underscore.
+func fe(p int) int {
+	const v_b = 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b * p // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+// local variable with underscore.
+func ff(p int) int {
+	var v_b = 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b * p // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+// inner function, parameter name with underscore.
+func fg() {
+	fgl := func(p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+	fgl(1)
+}
+
+type Foo struct{}
+
+// method name with underscore.
+func (f Foo) f_a() {} // ERROR "f_a contains underscore. You should use mixedCap or MixedCap."
+
+// method's parameter name with underscore.
+func (f Foo) fb(p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+// named return with underscore.
+func (f Foo) fc() (r_b int) { return 0 } // ERROR "r_b contains underscore. You should use mixedCap or MixedCap."
+
+// local variable (short declaration) with underscore.
+func (f Foo) fd(p int) int {
+	v_b := p * 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+// local constant with underscore.
+func (f Foo) fe(p int) int {
+	const v_b = 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b * p // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+// local variable with underscore.
+func (f Foo) ff(p int) int {
+	var v_b = 2 // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+
+	return v_b * p // ERROR "v_b contains underscore. You should use mixedCap or MixedCap."
+}
+
+func fna(a, p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+func fna1(a string, p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+func fnb(a, b, p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+func fnb1(a, b string, p_a int) {} // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+
+func fnd(
+	p_a int, // ERROR "p_a contains underscore. You should use mixedCap or MixedCap."
+	p_b int, // ERROR "p_b contains underscore. You should use mixedCap or MixedCap."
+	p_c int, // ERROR "p_c contains underscore. You should use mixedCap or MixedCap."
+) {
+	f_m_t.Println("") // ERROR "f_m_t contains underscore. You should use mixedCap or MixedCap."
+}