Add logger

go.mod

@@ -3,5 +3,6 @@ module github.com/nakabonne/golintui
 go 1.14
 
 require (
+	github.com/shibukawa/configdir v0.0.0-20170330084843-e180dbdc8da0
 	github.com/sirupsen/logrus v1.5.0
 )

go.sum

@@ -1,6 +1,8 @@
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/shibukawa/configdir v0.0.0-20170330084843-e180dbdc8da0 h1:Xuk8ma/ibJ1fOy4Ee11vHhUFHQNpHhrBneOCNHVXS5w=
+github.com/shibukawa/configdir v0.0.0-20170330084843-e180dbdc8da0/go.mod h1:7AwjWCpdPhkSmNAgUv5C7EJ4AbmjEB3r047r3DXWu3Y=
 github.com/sirupsen/logrus v1.5.0 h1:1N5EYkVAPEywqZRJd7cwnRtCb6xJx7NH3T3WUTF980Q=
 github.com/sirupsen/logrus v1.5.0/go.mod h1:+F7Ogzej0PZc/94MaYx/nvG9jOFMD2osvC3s+Squfpo=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=

pkg/app/app.go

@@ -15,16 +15,16 @@ type App struct {
 	Config *config.Config
 	Log    *logrus.Entry
 	Gui    *gui.Gui
-	//Tr            *i18n.Localizer
-	//Updater       *updates.Updater // may only need this on the Gui
-	//ClientContext string
+	// Tr            *i18n.Localizer
+	// Updater       *updates.Updater // may only need this on the Gui
+	// ClientContext string
 }
 
 func New(conf *config.Config) (*App, error) {
 	return &App{
-		closers: nil,
+		closers: []io.Closer{},
 		Config:  conf,
-		Log:     nil,
+		Log:     newLogger(conf),
 		Gui:     nil,
 	}, nil
 }

pkg/app/logger.go

@@ -0,0 +1,62 @@
+package app
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/shibukawa/configdir"
+	"github.com/sirupsen/logrus"
+
+	"github.com/nakabonne/golintui/pkg/config"
+)
+
+func newLogger(conf *config.Config) *logrus.Entry {
+	var log *logrus.Logger
+	if conf.GetDebug() || os.Getenv("DEBUG") == "TRUE" {
+		log = newDevelopmentLogger()
+	} else {
+		log = newProductionLogger()
+	}
+
+	log.Formatter = &logrus.JSONFormatter{}
+
+	return log.WithFields(logrus.Fields{
+		"debug":     conf.GetDebug(),
+		"version":   conf.GetVersion(),
+		"commit":    conf.GetCommit(),
+		"buildDate": conf.GetBuildDate(),
+	})
+}
+
+func newDevelopmentLogger() *logrus.Logger {
+	log := logrus.New()
+	log.SetLevel(getLogLevel())
+	file, err := os.OpenFile(filepath.Join(globalConfigDir(), "development.log"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		panic("unable to log to file") // TODO: don't panic (also, remove this call to the `panic` function)
+	}
+	log.SetOutput(file)
+	return log
+}
+func newProductionLogger() *logrus.Logger {
+	log := logrus.New()
+	log.Out = ioutil.Discard
+	log.SetLevel(logrus.ErrorLevel)
+	return log
+}
+
+func getLogLevel() logrus.Level {
+	strLevel := os.Getenv("LOG_LEVEL")
+	level, err := logrus.ParseLevel(strLevel)
+	if err != nil {
+		return logrus.DebugLevel
+	}
+	return level
+}
+
+func globalConfigDir() string {
+	configDirs := configdir.New("nakabonne", "golintui")
+	configDir := configDirs.QueryFolders(configdir.Global)[0]
+	return configDir.Path
+}

pkg/config/config.go

@@ -23,3 +23,19 @@ func New(name, version, commit, date, buildSource string, debuggingFlag bool) (*
 		BuildSource: "",
 	}, nil
 }
+
+func (c *Config) GetDebug() bool {
+	return c.Debug
+}
+
+func (c *Config) GetVersion() string {
+	return c.Version
+}
+
+func (c *Config) GetCommit() string {
+	return c.Commit
+}
+
+func (c *Config) GetBuildDate() string {
+	return c.BuildDate
+}