Add new linter: godot

.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
+}

vendor/github.com/tetafro/godot/.gitignore

@@ -0,0 +1 @@
+/godot

vendor/github.com/tetafro/godot/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Denis Krivak
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/tetafro/godot/README.md

@@ -0,0 +1,40 @@
+# godot
+
+[![License](http://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/tetafro/godot/master/LICENSE)
+[![Github CI](https://img.shields.io/github/workflow/status/tetafro/godot/Test)](https://github.com/tetafro/godot/actions?query=workflow%3ATest)
+[![Go Report](https://goreportcard.com/badge/github.com/tetafro/godot)](https://goreportcard.com/report/github.com/tetafro/godot)
+[![Codecov](https://codecov.io/gh/tetafro/godot/branch/master/graph/badge.svg)](https://codecov.io/gh/tetafro/godot)
+
+Linter that checks if all top-level comments contain a period at the
+end of the last sentence if needed.
+
+[CodeReviewComments](https://github.com/golang/go/wiki/CodeReviewComments#comment-sentences) quote:
+
+> Comments should begin with the name of the thing being described
+> and end in a period
+
+## Install and run
+
+```sh
+go get -u github.com/tetafro/godot/cmd/godot
+godot ./myproject
+```
+
+## Examples
+
+Code
+
+```go
+package math
+
+// Sum sums two integers
+func Sum(a, b int) int {
+    return a + b // result
+}
+```
+
+Output
+
+```sh
+Top level comment should end in a period: math/math.go:3:1
+```

vendor/github.com/tetafro/godot/go.mod

@@ -0,0 +1,3 @@
+module github.com/tetafro/godot
+
+go 1.13

vendor/github.com/tetafro/godot/godot.go

@@ -0,0 +1,130 @@
+// Package godot checks if all top-level comments contain a period at the
+// end of the last sentence if needed.
+package godot
+
+import (
+	"go/ast"
+	"go/token"
+	"regexp"
+	"strings"
+)
+
+// Message contains a message of linting error.
+type Message struct {
+	Pos     token.Position
+	Message string
+}
+
+// Settings contains linter settings.
+type Settings struct {
+	// Check all top-level comments, not only declarations
+	CheckAll bool
+}
+
+var (
+	// List of valid last characters.
+	lastChars = []string{".", "?", "!"}
+
+	// Special tags in comments like "nolint" or "build".
+	tags = regexp.MustCompile("^[a-z]+:")
+
+	// URL at the end of the line.
+	endURL = regexp.MustCompile(`[a-z]+://[^\s]+$`)
+)
+
+// Run runs this linter on the provided code.
+func Run(file *ast.File, fset *token.FileSet, settings Settings) []Message {
+	msgs := []Message{}
+
+	// Check all top-level comments
+	if settings.CheckAll {
+		for _, group := range file.Comments {
+			if ok, msg := check(fset, group); !ok {
+				msgs = append(msgs, msg)
+			}
+		}
+		return msgs
+	}
+
+	// Check only declaration comments
+	for _, decl := range file.Decls {
+		switch d := decl.(type) {
+		case *ast.GenDecl:
+		case *ast.FuncDecl:
+			if ok, msg := check(fset, d.Doc); !ok {
+				msgs = append(msgs, msg)
+			}
+		}
+	}
+	return msgs
+}
+
+func check(fset *token.FileSet, group *ast.CommentGroup) (ok bool, msg Message) {
+	if group == nil || len(group.List) == 0 {
+		return true, Message{}
+	}
+
+	// Check only top-level comments
+	if fset.Position(group.Pos()).Column > 1 {
+		return true, Message{}
+	}
+
+	// Get last element from comment group - it can be either
+	// last (or single) line for "//"-comment, or multiline string
+	// for "/*"-comment
+	last := group.List[len(group.List)-1]
+
+	line, ok := checkComment(last.Text)
+	if ok {
+		return true, Message{}
+	}
+	pos := fset.Position(last.Slash)
+	pos.Line += line
+	return false, Message{
+		Pos:     pos,
+		Message: "Top level comment should end in a period",
+	}
+}
+
+func checkComment(comment string) (line int, ok bool) {
+	// Check last line of "//"-comment
+	if strings.HasPrefix(comment, "//") {
+		comment = strings.TrimPrefix(comment, "//")
+		return 0, checkLastChar(comment)
+	}
+
+	// Check multiline "/*"-comment block
+	lines := strings.Split(comment, "\n")
+	var i int
+	for i = len(lines) - 1; i >= 0; i-- {
+		if s := strings.TrimSpace(lines[i]); s == "*/" || s == "" {
+			continue
+		}
+		break
+	}
+	comment = strings.TrimPrefix(lines[i], "/*")
+	comment = strings.TrimSuffix(comment, "*/")
+	return i, checkLastChar(comment)
+}
+
+func checkLastChar(s string) bool {
+	// Don't check comments starting with space indentation - they may
+	// contain code examples, which shouldn't end with period
+	if strings.HasPrefix(s, "  ") || strings.HasPrefix(s, "\t") {
+		return true
+	}
+	s = strings.TrimSpace(s)
+	if tags.MatchString(s) || endURL.MatchString(s) || strings.HasPrefix(s, "+build") {
+		return true
+	}
+	// Don't check empty lines
+	if s == "" {
+		return true
+	}
+	for _, ch := range lastChars {
+		if string(s[len(s)-1]) == ch {
+			return true
+		}
+	}
+	return false
+}

vendor/modules.txt

@@ -174,6 +174,8 @@ github.com/stretchr/testify/mock
 github.com/stretchr/testify/require
 # github.com/subosito/gotenv v1.2.0
 github.com/subosito/gotenv
+# github.com/tetafro/godot v0.2.5
+github.com/tetafro/godot
 # github.com/timakin/bodyclose v0.0.0-20190930140734-f7f2e9bca95e
 github.com/timakin/bodyclose/passes/bodyclose
 # github.com/tommy-muehle/go-mnd v1.3.1-0.20200224220436-e6f9a994e8fa