Reverse order of flag searching

Flags specified later can override flags specified earlier.

README.md

@@ -1,5 +1,5 @@
 # go-cli
 
-[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/sashakoshka/cli.svg)](https://pkg.go.dev/git.tebibyte.media/sashakoshka/cli)
+[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/sashakoshka/go-cli.svg)](https://pkg.go.dev/git.tebibyte.media/sashakoshka/go-cli)
 
 CLI module for Go programs.

cli.go

@@ -81,6 +81,7 @@ func (this *Cli) Parse (args []string) (*Cli, error) {
 	if len(args) > 0 { args = args[1:] }
 
 	next := func () string {
+		if len(args) < 1 { return "" }
 		args = args[1:]
 		if len(args) > 0 {
 			return args[0]
@@ -168,7 +169,8 @@ func (this *Cli) ParseOrExit (args []string) *Cli {
 // was found, it returns true. If it was not found, it returns nil, false.
 func (this *Cli) ShortFlag (short rune) (*Flag, bool) {
 	if short == 0 { return nil, false }
-	for _, flag := range this.Flags {
+	for index := len(this.Flags) - 1; index >= 0; index -- {
+		flag := this.Flags[index]
 		if flag.Short == short { return flag, true }
 	}
 	return nil, false
@@ -178,7 +180,8 @@ func (this *Cli) ShortFlag (short rune) (*Flag, bool) {
 // was found, it returns true. If it was not found, it returns nil, false.
 func (this *Cli) LongFlag (long string) (*Flag, bool) {
 	if long == "" { return nil, false }
-	for _, flag := range this.Flags {
+	for index := len(this.Flags) - 1; index >= 0; index -- {
+		flag := this.Flags[index]
 		if flag.Long == long { return flag, true }
 	}
 	return nil, false