sort-cli: magic constants

sort-cli/config.go

@@ -2,6 +2,8 @@ package main
 
 import "flag"
 
+const stdin = "-"
+
 type Config struct {
 	Key     int
 	Numeric bool
@@ -21,6 +23,6 @@ func (c *Config) ParseFlags() {
 	c.Sources = flag.Args()
 
 	if len(c.Sources) == 0 {
-		c.Sources = []string{"-"}
+		c.Sources = []string{stdin}
 	}
 }

sort-cli/content.go

@@ -9,6 +9,9 @@ import (
 	"strings"
 )
 
+// NL New line constant
+const NL = "\n"
+
 type content [][]byte
 
 func (c *content) Sort(reverse bool) {
@@ -42,14 +45,14 @@ func (c *content) String() string {
 	for _, line := range lines {
 		n += len(line)
 	}
-	n += len(lines) * len("\n")
+	n += len(lines) * len(NL)
 
 	var sb strings.Builder
 	sb.Grow(n)
 
 	for i, line := range lines {
 		if i > 0 {
-			sb.WriteString("\n")
+			sb.WriteString(NL)
 		}
 
 		for _, rn := range line {

sort-cli/loader.go

@@ -12,7 +12,7 @@ func open(sources []string) io.Reader {
 	for _, source := range sources {
 		var r io.Reader
 
-		if source == "-" {
+		if source == stdin {
 			r = os.Stdin
 		} else {
 			if _, err := os.Stat(source); err != nil {