Added go-mnd linter (#842)

* Initial commit

* Fixed goimports

* Update pkg/golinters/mnd.go

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* Run goimports

* Update pkg/golinters/mnd.go

Co-Authored-By: Bot from GolangCI <42910462+golangcibot@users.noreply.github.com>

* Add prefix for goimport local

* Run make README.md

* Incorporate review comments
Add test cases

* Update readme

* Update the description

* Removed subpath in local-prefixes

* Update readme

Author: sayboras

README.md

@@ -219,6 +219,7 @@ godox: Tool for detection of FIXME, TODO and other comment keywords [fast: true,
 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]
 golint: Golint differs from gofmt. Gofmt reformats Go source code, whereas golint prints out style mistakes [fast: true, auto-fix: false]
+gomnd: checks whether magic number is used [fast: true, auto-fix: false]
 gosec (gas): Inspects source code for security problems [fast: true, auto-fix: false]
 interfacer: Linter that suggests narrower interface types [fast: true, auto-fix: false]
 lll: Reports long lines [fast: true, auto-fix: false]
@@ -480,6 +481,7 @@ golangci-lint help linters
 - [funlen](https://github.com/ultraware/funlen) - Tool for detection of long functions
 - [whitespace](https://github.com/ultraware/whitespace) - Tool for detection of leading and trailing whitespace
 - [wsl](https://github.com/bombsimon/wsl) - Whitespace Linter - Forces you to use empty lines!
+- [gomnd](https://github.com/tommy-muehle/go-mnd) - checks whether magic number is used
 
 ## Configuration
 
@@ -1165,6 +1167,7 @@ Thanks to developers and authors of used linters:
 - [matoous](https://github.com/matoous)
 - [ultraware](https://github.com/ultraware)
 - [bombsimon](https://github.com/bombsimon)
+- [tommy-muehle](https://github.com/tommy-muehle)
 
 ## Changelog
 

go.mod

@@ -37,6 +37,7 @@ require (
 	github.com/spf13/viper v1.4.0
 	github.com/stretchr/testify v1.4.0
 	github.com/timakin/bodyclose v0.0.0-20190930140734-f7f2e9bca95e
+	github.com/tommy-muehle/go-mnd v0.0.0-20190903201840-c93e405da530
 	github.com/ultraware/funlen v0.0.2
 	github.com/ultraware/whitespace v0.0.4
 	github.com/uudashr/gocognit v0.0.0-20190926065955-1655d0de0517

go.sum

@@ -232,6 +232,8 @@ github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81P
 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=
+github.com/tommy-muehle/go-mnd v0.0.0-20190903201840-c93e405da530 h1:uUctDnVK0uevT4yglJXAXDG74EkQvGdu6L1pSoZx+T4=
+github.com/tommy-muehle/go-mnd v0.0.0-20190903201840-c93e405da530/go.mod h1:dSUh0FtTP8VhvkL1S+gUR1OKd9ZnSaozuI6r3m6wOig=
 github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
 github.com/ultraware/funlen v0.0.2 h1:Av96YVBwwNSe4MLR7iI/BIa3VyI7/djnto/pK3Uxbdo=

pkg/golinters/gomnd.go

@@ -0,0 +1,21 @@
+package golinters
+
+import (
+	magic_numbers "github.com/tommy-muehle/go-mnd"
+	"golang.org/x/tools/go/analysis"
+
+	"github.com/golangci/golangci-lint/pkg/golinters/goanalysis"
+)
+
+func NewGomnd() *goanalysis.Linter {
+	analyzers := []*analysis.Analyzer{
+		magic_numbers.Analyzer,
+	}
+
+	return goanalysis.NewLinter(
+		"gomnd",
+		"checks whether magic number is used",
+		analyzers,
+		nil,
+	).WithLoadMode(goanalysis.LoadModeSyntax)
+}

pkg/lint/lintersdb/manager.go

@@ -208,6 +208,9 @@ func (m Manager) GetAllSupportedLinterConfigs() []*linter.Config {
 		linter.NewConfig(golinters.NewWSL()).
 			WithPresets(linter.PresetStyle).
 			WithURL("https://github.com/bombsimon/wsl"),
+		linter.NewConfig(golinters.NewGomnd()).
+			WithPresets(linter.PresetStyle).
+			WithURL("https://github.com/tommy-muehle/go-mnd"),
 	}
 
 	isLocalRun := os.Getenv("GOLANGCI_COM_RUN") == ""

test/testdata/gomnd.go

@@ -0,0 +1,36 @@
+//args: -Egomnd
+package testdata
+
+import (
+	"log"
+	"net/http"
+	"time"
+)
+
+func UseMagicNumber() {
+	c := &http.Client{
+		Timeout: 1 * time.Second, // ERROR : "Magic number: 1, in <assign> detected"
+	}
+
+	res, err := c.Get("http://www.google.com")
+	if err != nil {
+		log.Fatal(err)
+	}
+	if res.StatusCode != 200 { // ERROR : "Magic number: 200, in <condition> detected"
+		log.Println("Something went wrong")
+	}
+}
+
+func UseNoMagicNumber() {
+	c := &http.Client{
+		Timeout: time.Second,
+	}
+
+	res, err := c.Get("http://www.google.com")
+	if err != nil {
+		log.Fatal(err)
+	}
+	if res.StatusCode != http.StatusOK {
+		log.Println("Something went wrong")
+	}
+}