Better flags help lines

cmd/test.go

@@ -5,8 +5,14 @@ import (
 	"os"
 
 	"go.fifitido.net/cmd"
+	"go.fifitido.net/cmd/flags"
 )
 
+var stringFlag = flags.String("string", "s", "", "example string flag")
+var intFlag = flags.Int("int", "i", 0, "example int flag")
+var boolFlag = flags.Bool("bool", "b", false, "example bool flag")
+var floatFlag = flags.Float("float", "f", 0, "example float flag")
+
 var root = cmd.NewRoot(
 	cmd.WithShortDescription("Example command"),
 	cmd.WithLongDescription(`An example command to show how to use go.fifitido.net/cmd
@@ -15,6 +21,7 @@ this example is just a simple hello world program to show
 the basics of the library.`),
 	cmd.WithSubcommand(subcmd),
 	cmd.WithArgument("name", false),
+	cmd.WithFlags(stringFlag, intFlag, boolFlag, floatFlag),
 	cmd.WithRunFunc(func(args []string) {
 		if len(args) == 0 {
 			fmt.Println("Hello World!")

flags/bool.go

@@ -11,7 +11,7 @@ type BoolFlag struct {
 
 var _ Flag = (*StringFlag)(nil)
 
-func NewBoolFlag(name, shortName string, defaultValue bool, description string) *BoolFlag {
+func Bool(name, shortName string, defaultValue bool, description string) *BoolFlag {
 	return &BoolFlag{
 		name:        name,
 		shortName:   shortName,

flags/flag.go

@@ -1,8 +1,34 @@
 package flags
 
+import "fmt"
+
 type Flag interface {
 	Name() string
 	ShortName() string
 	Description() string
 	Parse(raw string) error
 }
+
+func Names(f Flag) string {
+	names := ""
+	if f.ShortName() != "" {
+		names += fmt.Sprintf("-%s, ", f.ShortName())
+	}
+	names += fmt.Sprintf("--%s", f.Name())
+	return names
+}
+
+func HelpLine(f Flag, paddedWidth int) string {
+	argNames := ""
+	if f.ShortName() != "" {
+		argNames += fmt.Sprintf("-%s, ", f.ShortName())
+	}
+	argNames += fmt.Sprintf("--%s", f.Name())
+
+	spaceSize := paddedWidth - len(argNames)
+	if spaceSize > 0 {
+		argNames += fmt.Sprintf("%*s", spaceSize, "")
+	}
+
+	return argNames + "  " + f.Description()
+}

flags/float.go

@@ -11,7 +11,7 @@ type FloatFlag struct {
 
 var _ Flag = (*FloatFlag)(nil)
 
-func NewFloatFlag(name, shortName string, defaultValue float64, description string) *FloatFlag {
+func Float(name, shortName string, defaultValue float64, description string) *FloatFlag {
 	return &FloatFlag{
 		name:        name,
 		shortName:   shortName,

flags/int.go

@@ -11,7 +11,7 @@ type IntFlag struct {
 
 var _ Flag = (*StringFlag)(nil)
 
-func NewIntFlag(name, shortName string, defaultValue int, description string) *IntFlag {
+func Int(name, shortName string, defaultValue int, description string) *IntFlag {
 	return &IntFlag{
 		name:        name,
 		shortName:   shortName,

flags/set.go

@@ -23,6 +23,16 @@ func (s Set) Get(name string) (Flag, bool) {
 	return nil, false
 }
 
+func (s Set) MaxWidth() int {
+	max := 0
+	for _, f := range s {
+		if w := len(Names(f)); w > max {
+			max = w
+		}
+	}
+	return max
+}
+
 // TODO: Implement
 func (s Set) Parse(args []string) error {
 	return nil

flags/string.go

@@ -9,7 +9,7 @@ type StringFlag struct {
 
 var _ Flag = (*StringFlag)(nil)
 
-func NewStringFlag(name, shortName, defaultValue, description string) *StringFlag {
+func String(name, shortName, defaultValue, description string) *StringFlag {
 	return &StringFlag{
 		name:        name,
 		shortName:   shortName,
@@ -31,7 +31,6 @@ func (f *StringFlag) Name() string {
 // ShortName implements Flag.
 func (f *StringFlag) ShortName() string {
 	return f.shortName
-
 }
 
 // Value implements Flag.

help.go

@@ -2,6 +2,8 @@ package cmd
 
 import (
 	"fmt"
+
+	"go.fifitido.net/cmd/flags"
 )
 
 func (c *Command) ShowHelp() {
@@ -39,8 +41,9 @@ func (c *Command) ShowHelp() {
 	fmt.Println()
 	fmt.Println("Available flags:")
 
-	for _, s := range c.flags {
-		fmt.Println("  " + s.Name() + "    " + s.Description())
+	paddedWidth := c.flags.MaxWidth()
+	for _, f := range c.flags {
+		fmt.Println("  " + flags.HelpLine(f, paddedWidth))
 	}
 
 	fmt.Println("  -h, --help       Show the help menu")

option.go

@@ -22,7 +22,7 @@ func WithArgument(name string, required bool) Option {
 	}
 }
 
-func WithArguments(args []*Argument) Option {
+func WithArguments(args ...*Argument) Option {
 	return func(c *Command) {
 		c.arguments = append(c.arguments, args...)
 	}
@@ -34,7 +34,7 @@ func WithFlag(f flags.Flag) Option {
 	}
 }
 
-func WithFlags(fs []flags.Flag) Option {
+func WithFlags(fs ...flags.Flag) Option {
 	return func(c *Command) {
 		c.flags = append(c.flags, fs...)
 	}
@@ -47,7 +47,7 @@ func WithSubcommand(s *Command) Option {
 	}
 }
 
-func WithSubcommands(ss []*Command) Option {
+func WithSubcommands(ss ...*Command) Option {
 	return func(c *Command) {
 		c.subcommands = append(c.subcommands, ss...)
 	}