Restrucure project in a way where it is more modular

pkg/app/app.go

@@ -0,0 +1,49 @@
+package app
+
+import (
+	"io"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/jesseduffield/lazygit/pkg/commands"
+	"github.com/jesseduffield/lazygit/pkg/config"
+)
+
+// App struct
+type App struct {
+	closers []io.Closer
+
+	Config     config.AppConfigurer
+	Log        *logrus.Logger
+	OSCommand  *commands.OSCommand
+	GitCommand *commands.GitCommand
+}
+
+// NewApp retruns a new applications
+func NewApp(config config.AppConfigurer) (*App, error) {
+	app := &App{
+		closers: []io.Closer{},
+		Config:  config,
+	}
+	var err error
+	app.Log = logrus.New()
+	app.OSCommand, err = commands.NewOSCommand(app.Log)
+	if err != nil {
+		return nil, err
+	}
+	app.GitCommand, err = commands.NewGitCommand(app.Log, app.OSCommand)
+	if err != nil {
+		return nil, err
+	}
+	return app, nil
+}
+
+// Close closes any resources
+func (app *App) Close() error {
+	for _, closer := range app.closers {
+		err := closer.Close()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}