Merge branch 'master' into default-writer

.travis.yml

@@ -12,6 +12,7 @@ go:
 - 1.4.2
 - 1.5.x
 - 1.6.x
+- 1.7.x
 - master
 
 matrix:
@@ -20,6 +21,8 @@ matrix:
   include:
   - go: 1.6.x
     os: osx
+  - go: 1.7.x
+    os: osx
 
 before_script:
 - go get github.com/urfave/gfmrun/... || true

README.md

@@ -30,6 +30,7 @@ applications in an expressive way.
   * [Flags](#flags)
     + [Placeholder Values](#placeholder-values)
     + [Alternate Names](#alternate-names)
+    + [Ordering](#ordering)
     + [Values from the Environment](#values-from-the-environment)
     + [Values from alternate input sources (YAML, TOML, and others)](#values-from-alternate-input-sources-yaml-toml-and-others)
   * [Subcommands](#subcommands)
@@ -450,6 +451,56 @@ That flag can then be set with `--lang spanish` or `-l spanish`. Note that
 giving two different forms of the same flag in the same command invocation is an
 error.
 
+#### Ordering
+
+Flags for the application and commands are shown in the order they are defined.
+However, it's possible to sort them from outside this library by using `FlagsByName`
+with `sort`.
+
+For example this:
+
+<!-- {
+  "args": ["&#45;&#45;help"],
+  "output": "Load configuration from FILE\n.*Language for the greeting.*"
+} -->
+``` go
+package main
+
+import (
+  "os"
+  "sort"
+
+  "github.com/urfave/cli"
+)
+
+func main() {
+  app := cli.NewApp()
+
+  app.Flags = []cli.Flag {
+    cli.StringFlag{
+      Name: "lang, l",
+      Value: "english",
+      Usage: "Language for the greeting",
+    },
+    cli.StringFlag{
+      Name: "config, c",
+      Usage: "Load configuration from `FILE`",
+    },
+  }
+
+  sort.Sort(cli.FlagsByName(app.Flags))
+
+  app.Run(os.Args)
+}
+```
+
+Will result in help output like:
+
+```
+--config FILE, -c FILE  Load configuration from FILE
+--lang value, -l value  Language for the greeting (default: "english")
+```
+
 #### Values from the Environment
 
 You can also have the default value set from the environment via `EnvVar`.  e.g.

app.go

@@ -42,6 +42,8 @@ type App struct {
 	ArgsUsage string
 	// Version of the program
 	Version string
+	// Description of the program
+	Description string
 	// List of commands to execute
 	Commands []Command
 	// List of flags to parse
@@ -198,7 +200,7 @@ func (a *App) Run(arguments []string) (err error) {
 			HandleExitCoder(err)
 			return err
 		}
-		fmt.Fprintf(a.Writer, "%s\n\n", "Incorrect Usage.")
+		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
 		ShowAppHelp(context)
 		return err
 	}
@@ -319,7 +321,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 			HandleExitCoder(err)
 			return err
 		}
-		fmt.Fprintf(a.Writer, "%s\n\n", "Incorrect Usage.")
+		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
 		ShowSubcommandHelp(context)
 		return err
 	}

app_test.go

@@ -90,7 +90,62 @@ func ExampleApp_Run_subcommand() {
 	// Hello, Jeremy
 }
 
-func ExampleApp_Run_help() {
+func ExampleApp_Run_appHelp() {
+	// set args for examples sake
+	os.Args = []string{"greet", "help"}
+
+	app := NewApp()
+	app.Name = "greet"
+	app.Version = "0.1.0"
+	app.Description = "This is how we describe greet the app"
+	app.Authors = []Author{
+		{Name: "Harrison", Email: "harrison@lolwut.com"},
+		{Name: "Oliver Allen", Email: "oliver@toyshop.com"},
+	}
+	app.Flags = []Flag{
+		StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
+	}
+	app.Commands = []Command{
+		{
+			Name:        "describeit",
+			Aliases:     []string{"d"},
+			Usage:       "use it to see a description",
+			Description: "This is how we describe describeit the function",
+			Action: func(c *Context) error {
+				fmt.Printf("i like to describe things")
+				return nil
+			},
+		},
+	}
+	app.Run(os.Args)
+	// Output:
+	// NAME:
+	//    greet - A new cli application
+	//
+	// USAGE:
+	//    greet [global options] command [command options] [arguments...]
+	//
+	// VERSION:
+	//    0.1.0
+	//
+	// DESCRIPTION:
+	//    This is how we describe greet the app
+	//
+	// AUTHORS:
+	//    Harrison <harrison@lolwut.com>
+	//    Oliver Allen <oliver@toyshop.com>
+	//
+	// COMMANDS:
+	//      describeit, d  use it to see a description
+	//      help, h        Shows a list of commands or help for one command
+	//
+	// GLOBAL OPTIONS:
+	//    --name value   a name to say (default: "bob")
+	//    --help, -h     show help
+	//    --version, -v  print the version
+}
+
+func ExampleApp_Run_commandHelp() {
 	// set args for examples sake
 	os.Args = []string{"greet", "h", "describeit"}
 
@@ -258,6 +313,23 @@ func TestApp_RunAsSubcommandParseFlags(t *testing.T) {
 	expect(t, context.String("lang"), "spanish")
 }
 
+func TestApp_RunAsSubCommandIncorrectUsage(t *testing.T) {
+	a := App{
+		Flags: []Flag{
+			StringFlag{Name: "--foo"},
+		},
+		Writer: bytes.NewBufferString(""),
+	}
+
+	set := flag.NewFlagSet("", flag.ContinueOnError)
+	set.Parse([]string{"", "---foo"})
+	c := &Context{flagSet: set}
+
+	err := a.RunAsSubcommand(c)
+
+	expect(t, err, errors.New("bad flag syntax: ---foo"))
+}
+
 func TestApp_CommandWithFlagBeforeTerminator(t *testing.T) {
 	var parsedOption string
 	var args []string

command.go

@@ -138,7 +138,7 @@ func (c Command) Run(ctx *Context) (err error) {
 			HandleExitCoder(err)
 			return err
 		}
-		fmt.Fprintln(ctx.App.Writer, "Incorrect Usage.")
+		fmt.Fprintln(ctx.App.Writer, "Incorrect Usage:", err.Error())
 		fmt.Fprintln(ctx.App.Writer)
 		ShowCommandHelp(ctx, c.Name)
 		return err

flag.go

@@ -37,6 +37,21 @@ var HelpFlag = BoolFlag{
 // to display a flag.
 var FlagStringer FlagStringFunc = stringifyFlag
 
+// FlagsByName is a slice of Flag.
+type FlagsByName []Flag
+
+func (f FlagsByName) Len() int {
+	return len(f)
+}
+
+func (f FlagsByName) Less(i, j int) bool {
+	return f[i].GetName() < f[j].GetName()
+}
+
+func (f FlagsByName) Swap(i, j int) {
+	f[i], f[j] = f[j], f[i]
+}
+
 // Flag is a common interface related to parsing flags in cli.
 // For more advanced flag parsing techniques, it is recommended that
 // this interface be implemented.

help.go

@@ -16,24 +16,28 @@ var AppHelpTemplate = `NAME:
    {{.Name}} - {{.Usage}}
 
 USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}
-   {{if .Version}}{{if not .HideVersion}}
+   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
+
 VERSION:
-   {{.Version}}
-   {{end}}{{end}}{{if len .Authors}}
-AUTHOR(S):
-   {{range .Authors}}{{.}}{{end}}
-   {{end}}{{if .VisibleCommands}}
+   {{.Version}}{{end}}{{end}}{{if .Description}}
+
+DESCRIPTION:
+   {{.Description}}{{end}}{{if len .Authors}}
+
+AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
+   {{range $index, $author := .Authors}}{{if $index}}
+   {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
+
 COMMANDS:{{range .VisibleCategories}}{{if .Name}}
    {{.Name}}:{{end}}{{range .VisibleCommands}}
-     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}
-{{end}}{{end}}{{if .VisibleFlags}}
+     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
+
 GLOBAL OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}{{if .Copyright}}
+   {{range $index, $option := .VisibleFlags}}{{if $index}}
+   {{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
+
 COPYRIGHT:
-   {{.Copyright}}
-   {{end}}
+   {{.Copyright}}{{end}}
 `
 
 // CommandHelpTemplate is the text template for the command help topic.