feat: natural sorting

so like numbers are in order and stuff idk black magic

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"cmp"
 	"embed"
 	"fmt"
 	"io"
@@ -16,6 +17,8 @@ import (
 	"strings"
 	"text/template"
 	"time"
+	"unicode"
+	"unicode/utf8"
 )
 
 var (
@@ -114,6 +117,54 @@ func getEntryIcon(name string, isDir bool) string {
 	}
 }
 
+func parseNumber(s string) (num int, chars int) {
+	for chars < len(s) && s[chars] >= '0' && s[chars] <= '9' {
+		num = num*10 + int(s[chars]-'0')
+		chars++
+	}
+	return
+}
+
+func naturalCompare(a, b string) int {
+
+	for len(a) > 0 && len(b) > 0 {
+
+		if unicode.IsDigit(rune(a[0])) && unicode.IsDigit(rune(b[0])) {
+
+			aValue, aSize := parseNumber(a)
+			bValue, bSize := parseNumber(b)
+
+			if aValue != bValue {
+				if aValue < bValue {
+					return -1
+				}
+				return 1
+			}
+
+			a = a[aSize:]
+			b = b[bSize:]
+			continue
+		}
+
+		aRune, aSize := utf8.DecodeRuneInString(a)
+		bRune, bSize := utf8.DecodeRuneInString(b)
+		aRuneLower := unicode.ToLower(aRune)
+		bRuneLower := unicode.ToLower(bRune)
+
+		if aRuneLower != bRuneLower {
+			if aRuneLower < bRuneLower {
+				return -1
+			}
+			return 1
+		}
+
+		a = a[aSize:]
+		b = b[bSize:]
+	}
+
+	return cmp.Compare(len(a), len(b))
+}
+
 func init() {
 	if serveAddress == "" {
 		serveAddress = "127.0.0.1:8080"
@@ -152,6 +203,13 @@ func main() {
 			return
 		}
 
+		// Append trailing slash to directories so rendered HTML has proper paths
+		if filestat.IsDir() && !strings.HasSuffix(r.URL.Path, "/") {
+			r.URL.Path += "/"
+			http.Redirect(w, r, r.URL.String(), http.StatusMovedPermanently)
+			return
+		}
+
 		// Use Browser Cache (if possible)
 		modtime := filestat.ModTime().UTC()
 		modhash := fmt.Sprint(modtime.Unix())
@@ -233,14 +291,14 @@ func main() {
 				// Use
 				if sortOrder == "modified" {
 					if a.ModTime.Equal(b.ModTime) {
-						return strings.Compare(a.Name, b.Name)
+						return naturalCompare(a.Name, b.Name)
 					}
 					if a.ModTime.After(b.ModTime) {
 						return -1
 					}
 					return 1
 				}
-				return strings.Compare(a.Name, b.Name)
+				return naturalCompare(a.Name, b.Name)
 			})
 
 			// Directory Listing