diff --git a/client.go b/client.go
index c7b22cb..6d19ba7 100644
--- a/client.go
+++ b/client.go
@@ -52,7 +52,7 @@ func readExpr() <-chan expr {
 
 		c, err := net.Dial(gSocketProt, gSocketPath)
 		for err != nil {
-			log.Printf(fmt.Sprintf("connecting server: %s", err))
+			log.Printf("connecting server: %s", err)
 			time.Sleep(duration)
 			duration *= 2
 			c, err = net.Dial(gSocketProt, gSocketPath)
diff --git a/diacritics.go b/diacritics.go
index ff58f85..7bc4deb 100644
--- a/diacritics.go
+++ b/diacritics.go
@@ -21,7 +21,6 @@ func init() {
 		"áạàảãăắặằẳẵâấậầẩẫéẹèẻẽêếệềểễiíịìỉĩoóọòỏõôốộồổỗơớợờởỡúụùủũưứựừửữyýỵỳỷỹđ",
 		"aaaaaaaaaaaaaaaaaeeeeeeeeeeeiiiiiioooooooooooooooooouuuuuuuuuuuyyyyyyd",
 	)
-
 }
 
 func appendTransliterate(base, norm string) {
diff --git a/eval.go b/eval.go
index 2d45195..8200ada 100644
--- a/eval.go
+++ b/eval.go
@@ -480,7 +480,7 @@ func insert(app *app, arg string) {
 		normal(app)
 
 		if arg == "y" {
-			if err := app.nav.rename(app.ui); err != nil {
+			if err := app.nav.rename(); err != nil {
 				app.ui.echoerrf("rename: %s", err)
 				return
 			}
@@ -716,7 +716,6 @@ func (e *callExpr) eval(app *app, args []string) {
 			}
 		} else {
 			fileOrSelections, err := app.nav.currFileOrSelections()
-
 			if err != nil {
 				app.ui.echoerrf("delete: %s", err)
 				return
@@ -1098,7 +1097,7 @@ func (e *callExpr) eval(app *app, args []string) {
 					return
 				}
 
-				if err := app.nav.rename(app.ui); err != nil {
+				if err := app.nav.rename(); err != nil {
 					app.ui.echoerrf("rename: %s", err)
 					return
 				}
diff --git a/eval_test.go b/eval_test.go
index 94c0e3e..24947c6 100644
--- a/eval_test.go
+++ b/eval_test.go
@@ -298,13 +298,17 @@ var gEvalTests = []struct {
 			cd ~
 			set hidden
 		}}`,
-		[]string{"cmd", "gohome", ":", "{{",
+		[]string{
+			"cmd", "gohome", ":", "{{",
 			"cd", "~", "\n",
 			"set", "hidden", "\n",
-			"}}", "\n"},
-		[]expr{&cmdExpr{"gohome", &listExpr{[]expr{
-			&callExpr{"cd", []string{"~"}, 1},
-			&setExpr{"hidden", ""}}},
+			"}}", "\n",
+		},
+		[]expr{&cmdExpr{
+			"gohome", &listExpr{[]expr{
+				&callExpr{"cd", []string{"~"}, 1},
+				&setExpr{"hidden", ""},
+			}},
 		}},
 	},
 
@@ -313,13 +317,17 @@ var gEvalTests = []struct {
 			cd ~
 			set hidden
 		}}`,
-		[]string{"map", "gh", ":", "{{",
+		[]string{
+			"map", "gh", ":", "{{",
 			"cd", "~", "\n",
 			"set", "hidden", "\n",
-			"}}", "\n"},
-		[]expr{&mapExpr{"gh", &listExpr{[]expr{
-			&callExpr{"cd", []string{"~"}, 1},
-			&setExpr{"hidden", ""}}},
+			"}}", "\n",
+		},
+		[]expr{&mapExpr{
+			"gh", &listExpr{[]expr{
+				&callExpr{"cd", []string{"~"}, 1},
+				&setExpr{"hidden", ""},
+			}},
 		}},
 	},
 
diff --git a/go.sum b/go.sum
index ba536c1..8288bd3 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,4 @@
-github.com/mattn/go-runewidth v0.0.3 h1:a+kO+98RDGEfo6asOGMmpodZq4FNtnGP54yps8BzLR4=
-github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
-github.com/nsf/termbox-go v0.0.0-20180613055208-5c94acc5e6eb h1:YahEjAGkJtCrkqgVHhX6n8ZX+CZ3hDRL9fjLYugLfSs=
-github.com/nsf/termbox-go v0.0.0-20180613055208-5c94acc5e6eb/go.mod h1:IuKpRQcYE1Tfu+oAQqaLisqDeXgjyyltCfsaoYN18NQ=
 github.com/nsf/termbox-go v0.0.0-20190325093121-288510b9734e h1:Vbib8wJAaMEF9jusI/kMSYMr/LtRzM7+F9MJgt/nH8k=
 github.com/nsf/termbox-go v0.0.0-20190325093121-288510b9734e/go.mod h1:IuKpRQcYE1Tfu+oAQqaLisqDeXgjyyltCfsaoYN18NQ=
diff --git a/nav.go b/nav.go
index 2fb48a3..4c09627 100644
--- a/nav.go
+++ b/nav.go
@@ -415,7 +415,7 @@ func (nav *nav) preview() {
 	nav.regChan <- reg
 }
 
-func (nav *nav) loadReg(ui *ui, path string) *reg {
+func (nav *nav) loadReg(path string) *reg {
 	r, ok := nav.regCache[path]
 	if !ok {
 		go nav.preview()
@@ -726,7 +726,6 @@ func (nav *nav) paste(ui *ui) error {
 
 func (nav *nav) del() error {
 	list, err := nav.currFileOrSelections()
-
 	if err != nil {
 		return err
 	}
@@ -740,7 +739,7 @@ func (nav *nav) del() error {
 	return nil
 }
 
-func (nav *nav) rename(ui *ui) error {
+func (nav *nav) rename() error {
 	oldPath := nav.renameCache[0]
 	newPath := nav.renameCache[1]
 	dir, _ := filepath.Split(newPath)
@@ -828,7 +827,6 @@ func (nav *nav) globSel(pattern string, invert bool) error {
 
 	for i := 0; i < len(curDir.files); i++ {
 		match, err := filepath.Match(pattern, curDir.files[i].Name())
-
 		if err != nil {
 			return fmt.Errorf("glob-select: %s", err)
 		}
@@ -1007,9 +1005,8 @@ func (nav *nav) removeMark(mark string) error {
 	if _, ok := nav.marks[mark]; ok {
 		delete(nav.marks, mark)
 		return nil
-	} else {
-		return fmt.Errorf("no such mark")
 	}
+	return fmt.Errorf("no such mark")
 }
 
 func (nav *nav) readMarks() error {
diff --git a/os_windows.go b/os_windows.go
index dd86e2b..8f2de15 100644
--- a/os_windows.go
+++ b/os_windows.go
@@ -18,9 +18,7 @@ var (
 	envShell  = os.Getenv("SHELL")
 )
 
-var (
-	envPathExt = os.Getenv("PATHEXT")
-)
+var envPathExt = os.Getenv("PATHEXT")
 
 var (
 	gDefaultShell      = "cmd"
diff --git a/server.go b/server.go
index e18664c..78c844f 100644
--- a/server.go
+++ b/server.go
@@ -58,6 +58,7 @@ func listen(l net.Listener) {
 func handleConn(c net.Conn) {
 	s := bufio.NewScanner(c)
 
+Loop:
 	for s.Scan() {
 		log.Printf("listen: %s", s.Text())
 		word, rest := splitWord(s.Text())
@@ -71,7 +72,7 @@ func handleConn(c net.Conn) {
 				gCopyFile = false
 			default:
 				log.Printf("unexpected option to copy file(s): %s", s.Text())
-				break
+				break Loop
 			}
 			gFileList = nil
 			for s.Scan() && s.Text() != "" {
@@ -120,7 +121,7 @@ func handleConn(c net.Conn) {
 				c.Close()
 			}
 			gListener.Close()
-			break
+			break Loop
 		default:
 			log.Printf("listen: unexpected command: %s", word)
 		}
diff --git a/ui.go b/ui.go
index f916ff8..5b106d4 100644
--- a/ui.go
+++ b/ui.go
@@ -190,8 +190,6 @@ func (win *win) printReg(reg *reg) {
 	for i, l := range reg.lines {
 		fg, bg = win.print(2, i, fg, bg, l)
 	}
-
-	return
 }
 
 func fileInfo(f *file, d *dir) string {
@@ -539,7 +537,7 @@ func (ui *ui) loadFile(nav *nav) {
 	if curr.IsDir() {
 		ui.dirPrev = nav.loadDir(curr.path)
 	} else if curr.Mode().IsRegular() {
-		ui.regPrev = nav.loadReg(ui, curr.path)
+		ui.regPrev = nav.loadReg(curr.path)
 	}
 }
 
@@ -617,7 +615,7 @@ func (ui *ui) drawStatLine(nav *nav) {
 	ui.msgWin.printRight(0, fg, bg, ruler)
 }
 
-func (ui *ui) drawBox(nav *nav) {
+func (ui *ui) drawBox() {
 	fg, bg := termbox.ColorDefault, termbox.ColorDefault
 
 	w, h := termbox.Size()
@@ -699,7 +697,7 @@ func (ui *ui) draw(nav *nav) {
 	}
 
 	if gOpts.drawbox {
-		ui.drawBox(nav)
+		ui.drawBox()
 	}
 
 	if ui.menuBuf != nil {