From 1c81757e1f5188fface135d3c7d73ebb47202c87 Mon Sep 17 00:00:00 2001 From: Dan Buch Date: Wed, 1 Jun 2016 13:28:27 -0400 Subject: [PATCH] Add more v1 API examples --- README.md | 376 +++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 373 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index e6701e5..f8361ce 100644 --- a/README.md +++ b/README.md @@ -752,14 +752,14 @@ func main() { } ``` -#### To Enable +#### Enabling Source the `autocomplete/bash_autocomplete` file in your `.bashrc` file while setting the `PROG` variable to the name of your program: `PROG=myprogram source /.../cli/autocomplete/bash_autocomplete` -#### To Distribute +#### Distribution Copy `autocomplete/bash_autocomplete` into `/etc/bash_completion.d/` and rename it to the name of the program you wish to add autocomplete support for (or @@ -775,7 +775,48 @@ Alternatively, you can just document that users should source the generic `autocomplete/bash_autocomplete` in their bash configuration with `$PROG` set to the name of their program (as above). -### Generated Help Text Customization +#### Customization + +The default bash completion flag (`--generate-bash-completion`) is defined as +`cli.BashCompletionFlag`, and may be redefined if desired, e.g.: + + +``` go +package main + +import ( + "os" + + "github.com/urfave/cli" +) + +func main() { + cli.BashCompletionFlag = cli.BoolFlag{ + Name: "compgen", + Hidden: true, + } + + app := cli.NewApp() + app.EnableBashCompletion = true + app.Commands = []cli.Command{ + { + Name: "wat", + }, + } + app.Run(os.Args) +} +``` + +### Generated Help Text + +The default help flag (`-h/--help`) is defined as `cli.HelpFlag` and is checked +by the cli internals in order to print generated help text for the app, command, +or subcommand, and break execution. + +#### Customization All of the help text generation may be customized, and at multiple levels. The templates are exposed as variables `AppHelpTemplate`, `CommandHelpTemplate`, and @@ -841,6 +882,335 @@ VERSION: } ``` +The default flag may be customized to something other than `-h/--help` by +setting `cli.HelpFlag`, e.g.: + + +``` go +package main + +import ( + "os" + + "github.com/urfave/cli" +) + +func main() { + cli.HelpFlag = cli.BoolFlag{ + Name: "halp, haaaaalp", + Usage: "HALP", + EnvVar: "SHOW_HALP,HALPPLZ", + } + + cli.NewApp().Run(os.Args) +} +``` + +### Version Flag + +The default version flag (`-v/--version`) is defined as `cli.VersionFlag`, which +is checked by the cli internals in order to print the `App.Version` via +`cli.VersionPrinter` and break execution. + +#### Customization + +The default flag may be cusomized to something other than `-v/--version` by +setting `cli.VersionFlag`, e.g.: + + +``` go +package main + +import ( + "os" + + "github.com/urfave/cli" +) + +func main() { + cli.VersionFlag = cli.BoolFlag{ + Name: "print-version, V", + Usage: "print only the version", + } + + app := cli.NewApp() + app.Name = "partay" + app.Version = "v19.99.0" + app.Run(os.Args) +} +``` + +Alternatively, the version printer at `cli.VersionPrinter` may be overridden, e.g.: + + +``` go +package main + +import ( + "fmt" + "os" + + "github.com/urfave/cli" +) + +var ( + Revision = "fafafaf" +) + +func main() { + cli.VersionPrinter = func(c *cli.Context) { + fmt.Printf("version=%s revision=%s\n", c.App.Version, Revision) + } + + app := cli.NewApp() + app.Name = "partay" + app.Version = "v19.99.0" + app.Run(os.Args) +} +``` + +#### Full API Example + +**NOTE**: This is a contrived (functioning) example meant strictly for API +demonstration purposes. Use of one's imagination is encouraged. + +``` go +package main + +import ( + "errors" + "flag" + "fmt" + "io" + "io/ioutil" + "time" + + "github.com/urfave/cli" +) + +func init() { + cli.AppHelpTemplate += "\nCUSTOMIZED: you bet ur muffins\n" + cli.CommandHelpTemplate += "\nYMMV\n" + cli.SubcommandHelpTemplate += "\nor something\n" + + cli.HelpFlag = cli.BoolFlag{Name: "halp"} + cli.BashCompletionFlag = cli.BoolFlag{Name: "compgen", Hidden: true} + cli.VersionFlag = cli.BoolFlag{Name: "print-version, V"} + + cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) { + fmt.Fprintf(w, "best of luck to you\n") + } + cli.VersionPrinter = func(c *cli.Context) { + fmt.Fprintf(c.App.Writer, "version=%s\n", c.App.Version) + } + cli.OsExiter = func(c int) { + fmt.Fprintf(cli.ErrWriter, "refusing to exit %d\n", c) + } + cli.ErrWriter = ioutil.Discard + cli.FlagStringer = func(fl cli.Flag) string { + return fmt.Sprintf("\t\t%s", fl.GetName()) + } +} + +type hexWriter struct{} + +func (w *hexWriter) Write(p []byte) (int, error) { + for _, b := range p { + fmt.Printf("%x", b) + } + fmt.Printf("\n") + + return len(p), nil +} + +func main() { + app := cli.NewApp() + app.Name = "kənˈtrīv" + app.Version = "v19.99.0" + app.Compiled = time.Now() + app.Authors = []cli.Author{ + { + Name: "Example Human", + Email: "human@example.com", + }, + } + app.Copyright = "(c) 1999 Serious Enterprise" + app.HelpName = "contrive" + app.Usage = "demonstrate available API" + app.UsageText = "contrive - demonstrating the available API" + app.ArgsUsage = "[args and such]" + app.Commands = []cli.Command{ + { + Name: "doo", + Aliases: []string{"do"}, + Category: "motion", + Usage: "do the doo", + UsageText: "doo - does the dooing", + Description: "no really, there is a lot of dooing to be done", + ArgsUsage: "[arrgh]", + Flags: []cli.Flag{ + cli.BoolFlag{Name: "forever, forevvarr"}, + }, + Subcommands: cli.Commands{ + { + Name: "wop", + Action: wopAction, + }, + }, + SkipFlagParsing: false, + HideHelp: false, + Hidden: false, + HelpName: "doo!", + BashComplete: func(c *cli.Context) { + fmt.Fprintf(c.App.Writer, "--better\n") + }, + Before: func(c *cli.Context) error { + fmt.Fprintf(c.App.Writer, "brace for impact\n") + return nil + }, + After: func(c *cli.Context) error { + fmt.Fprintf(c.App.Writer, "did we lose anyone?\n") + return nil + }, + Action: func(c *cli.Context) error { + c.Command.FullName() + c.Command.HasName("wop") + c.Command.Names() + c.Command.VisibleFlags() + fmt.Fprintf(c.App.Writer, "dodododododoodododddooooododododooo\n") + if c.Bool("forever") { + c.Command.Run(c) + } + return nil + }, + OnUsageError: func(c *cli.Context, err error, isSubcommand bool) error { + fmt.Fprintf(c.App.Writer, "for shame\n") + return err + }, + }, + } + app.Flags = []cli.Flag{ + cli.BoolFlag{Name: "fancy"}, + cli.BoolTFlag{Name: "fancy"}, + cli.StringFlag{Name: "dance-move, d"}, + } + app.EnableBashCompletion = true + app.HideHelp = false + app.HideVersion = false + app.BashComplete = func(c *cli.Context) { + fmt.Fprintf(c.App.Writer, "lipstick\nkiss\nme\nlipstick\nringo\n") + } + app.Before = func(c *cli.Context) error { + fmt.Fprintf(c.App.Writer, "HEEEERE GOES\n") + return nil + } + app.After = func(c *cli.Context) error { + fmt.Fprintf(c.App.Writer, "Phew!\n") + return nil + } + app.CommandNotFound = func(c *cli.Context, command string) { + fmt.Fprintf(c.App.Writer, "Thar be no %q here.\n", command) + } + app.OnUsageError = func(c *cli.Context, err error, isSubcommand bool) error { + if isSubcommand { + return err + } + + fmt.Fprintf(c.App.Writer, "WRONG: %#v\n", err) + return nil + } + app.Action = func(c *cli.Context) error { + cli.DefaultAppComplete(c) + cli.HandleExitCoder(errors.New("not an exit coder, though")) + cli.ShowAppHelp(c) + cli.ShowCommandCompletions(c, "nope") + cli.ShowCommandHelp(c, "also-nope") + cli.ShowCompletions(c) + cli.ShowSubcommandHelp(c) + cli.ShowVersion(c) + + categories := c.App.Categories() + categories.AddCommand("sounds", cli.Command{ + Name: "bloop", + }) + + for _, category := range categories { + fmt.Fprintf(c.App.Writer, "%s\n", category.Name) + fmt.Fprintf(c.App.Writer, "%#v\n", category.Commands) + fmt.Fprintf(c.App.Writer, "%#v\n", category.VisibleCommands()) + } + + c.App.Command("doo") + c.App.Run([]string{"app", "doo", "wop"}) + c.App.RunAsSubcommand(c) + c.App.Setup() + c.App.VisibleCategories() + c.App.VisibleCommands() + c.App.VisibleFlags() + + c.Args().First() + c.Args().Get(1) + c.Args().Present() + c.Args().Tail() + + set := flag.NewFlagSet("contrive", 0) + nc := cli.NewContext(c.App, set, c) + nc.Args() + nc.Bool("nope") + nc.BoolT("nerp") + nc.Duration("howlong") + nc.Float64("hay") + nc.Generic("bloop") + nc.Int("bips") + nc.IntSlice("blups") + nc.String("snurt") + nc.StringSlice("snurkles") + nc.GlobalBool("global-nope") + nc.GlobalBoolT("global-nerp") + nc.GlobalDuration("global-howlong") + nc.GlobalFloat64("global-hay") + nc.GlobalGeneric("global-bloop") + nc.GlobalInt("global-bips") + nc.GlobalIntSlice("global-blups") + nc.GlobalString("global-snurt") + nc.GlobalStringSlice("global-snurkles") + + nc.FlagNames() + nc.GlobalFlagNames() + nc.GlobalIsSet("wat") + nc.GlobalSet("wat", "nope") + nc.NArg() + nc.NumFlags() + nc.Parent() + nc.Set("wat", "also-nope") + + ec := cli.NewExitError("ohwell", 86) + fmt.Fprintf(c.App.Writer, "%d", ec.ExitCode()) + return ec + } + app.Writer = &hexWriter{} + app.ErrWriter = &hexWriter{} + app.Metadata = map[string]interface{}{ + "layers": "many", + "explicable": false, + } +} + +func wopAction(c *cli.Context) error { + fmt.Fprintf(c.App.Writer, ":wave: over here, eh\n") + return nil +} +``` + ## Contribution Guidelines Feel free to put up a pull request to fix a bug or maybe add a feature. 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