Add new linter: godot

Author: Denis Krivak

.golangci.example.yml

@@ -126,6 +126,9 @@ linters-settings:
   gocyclo:
     # minimal code complexity to report, 30 by default (but we recommend 10-20)
     min-complexity: 10
+  godot:
+    # check all top-level comments, not only declarations
+    check-all: false
   godox:
     # report any comments starting with keywords, this is useful for TODO or FIXME comments that
     # might be left in the code accidentally and should be resolved before merging

README.md

@@ -217,6 +217,7 @@ gocognit: Computes and checks the cognitive complexity of functions [fast: true,
 goconst: Finds repeated strings that could be replaced by a constant [fast: true, auto-fix: false]
 gocritic: The most opinionated Go source code linter [fast: true, auto-fix: false]
 gocyclo: Computes and checks the cyclomatic complexity of functions [fast: true, auto-fix: false]
+godot: Check if comments end in a period [fast: true, auto-fix: false]
 godox: Tool for detection of FIXME, TODO and other comment keywords [fast: true, auto-fix: false]
 gofmt: Gofmt checks whether code was gofmt-ed. By default this tool runs with -s option to check for code simplification [fast: true, auto-fix: true]
 goimports: Goimports does everything that gofmt does. Additionally it checks unused imports [fast: true, auto-fix: true]
@@ -488,6 +489,7 @@ golangci-lint help linters
 - [wsl](https://github.com/bombsimon/wsl) - Whitespace Linter - Forces you to use empty lines!
 - [goprintffuncname](https://github.com/jirfag/go-printf-func-name) - Checks that printf-like functions are named with `f` at the end
 - [gomnd](https://github.com/tommy-muehle/go-mnd) - An analyzer to detect magic numbers.
+- [godot](https://github.com/tetafro/godot) - Check if comments end in a period
 
 ## Configuration
 
@@ -736,6 +738,9 @@ linters-settings:
   gocyclo:
     # minimal code complexity to report, 30 by default (but we recommend 10-20)
     min-complexity: 10
+  godot:
+    # check all top-level comments, not only declarations
+    check-all: false
   godox:
     # report any comments starting with keywords, this is useful for TODO or FIXME comments that
     # might be left in the code accidentally and should be resolved before merging
@@ -1261,6 +1266,7 @@ Thanks to developers and authors of used linters:
 - [bombsimon](https://github.com/bombsimon)
 - [jirfag](https://github.com/jirfag)
 - [tommy-muehle](https://github.com/tommy-muehle)
+- [tetafro](https://github.com/tetafro)
 
 ## Changelog
 

go.mod

@@ -38,6 +38,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.6.1
 	github.com/stretchr/testify v1.5.1
+	github.com/tetafro/godot v0.2.5
 	github.com/timakin/bodyclose v0.0.0-20190930140734-f7f2e9bca95e
 	github.com/tommy-muehle/go-mnd v1.3.1-0.20200224220436-e6f9a994e8fa
 	github.com/ultraware/funlen v0.0.2

go.sum

@@ -262,6 +262,8 @@ github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
+github.com/tetafro/godot v0.2.5 h1:7+EYJM/Z4gYZhBFdRrVm6JTj5ZLw/QI1j4RfEOXJviE=
+github.com/tetafro/godot v0.2.5/go.mod h1:pT6/T8+h6//L/LwQcFc4C0xpfy1euZwzS1sHdrFCms0=
 github.com/timakin/bodyclose v0.0.0-20190930140734-f7f2e9bca95e h1:RumXZ56IrCj4CL+g1b9OL/oH0QnsF976bC8xQFYUD5Q=
 github.com/timakin/bodyclose v0.0.0-20190930140734-f7f2e9bca95e/go.mod h1:Qimiffbc6q9tBWlVV6x0P9sat/ao1xEkREYPPj9hphk=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=

pkg/config/config.go

@@ -196,6 +196,7 @@ type LintersSettings struct {
 	Godox    GodoxSettings
 	Dogsled  DogsledSettings
 	Gocognit GocognitSettings
+	Godot    GodotSettings
 
 	Custom map[string]CustomLinterSettings
 }
@@ -273,6 +274,10 @@ type WSLSettings struct {
 	ForceCaseTrailingWhitespaceLimit int  `mapstructure:"force-case-trailing-whitespace"`
 }
 
+type GodotSettings struct {
+	CheckAll bool `mapstructure:"check-all"`
+}
+
 //nolint:gomnd
 var defaultLintersSettings = LintersSettings{
 	Lll: LllSettings{

pkg/golinters/godot.go

@@ -0,0 +1,64 @@
+package golinters
+
+import (
+	"sync"
+
+	"github.com/tetafro/godot"
+	"golang.org/x/tools/go/analysis"
+
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
+	"github.com/golangci/golangci-lint/pkg/lint/linter"
+	"github.com/golangci/golangci-lint/pkg/result"
+)
+
+const godotName = "godot"
+
+func NewGodot() *goanalysis.Linter {
+	var mu sync.Mutex
+	var resIssues []goanalysis.Issue
+
+	analyzer := &analysis.Analyzer{
+		Name: godotName,
+		Doc:  goanalysis.TheOnlyanalyzerDoc,
+	}
+	return goanalysis.NewLinter(
+		godotName,
+		"Check if comments end in a period",
+		[]*analysis.Analyzer{analyzer},
+		nil,
+	).WithContextSetter(func(lintCtx *linter.Context) {
+		cfg := lintCtx.Cfg.LintersSettings.Godot
+		settings := godot.Settings{CheckAll: cfg.CheckAll}
+
+		analyzer.Run = func(pass *analysis.Pass) (interface{}, error) {
+			var issues []godot.Message
+			for _, file := range pass.Files {
+				issues = append(issues, godot.Run(file, pass.Fset, settings)...)
+			}
+
+			if len(issues) == 0 {
+				return nil, nil
+			}
+
+			res := make([]goanalysis.Issue, len(issues))
+			for k, i := range issues {
+				issue := result.Issue{
+					Pos:         i.Pos,
+					Text:        i.Message,
+					FromLinter:  godotName,
+					Replacement: &result.Replacement{},
+				}
+
+				res[k] = goanalysis.NewIssue(&issue, pass)
+			}
+
+			mu.Lock()
+			resIssues = append(resIssues, res...)
+			mu.Unlock()
+
+			return nil, nil
+		}
+	}).WithIssuesReporter(func(*linter.Context) []goanalysis.Issue {
+		return resIssues
+	}).WithLoadMode(goanalysis.LoadModeSyntax)
+}

pkg/lint/lintersdb/manager.go

@@ -247,6 +247,9 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		linter.NewConfig(golinters.NewGoMND(m.cfg)).
 			WithPresets(linter.PresetStyle).
 			WithURL("https://github.com/tommy-muehle/go-mnd"),
+		linter.NewConfig(golinters.NewGodot()).
+			WithPresets(linter.PresetStyle).
+			WithURL("https://github.com/tetafro/godot"),
 	}
 
 	isLocalRun := os.Getenv("GOLANGCI_COM_RUN") == ""

test/testdata/godot.go

@@ -0,0 +1,7 @@
+//args: -Egodot
+package testdata
+
+// Godot checks top-level comments // ERROR "Top level comment should end in a period"
+func Godot() {
+	// nothing to do here
+}