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50 lines
1.7 KiB
Go
50 lines
1.7 KiB
Go
/*
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Package docopt parses command-line arguments based on a help message.
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Given a conventional command-line help message, docopt processes the arguments.
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See https://github.com/docopt/docopt#help-message-format for a description of
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the help message format.
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This package exposes three different APIs, depending on the level of control
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required. The first, simplest way to parse your docopt usage is to just call:
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docopt.ParseDoc(usage)
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This will use os.Args[1:] as the argv slice, and use the default parser
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options. If you want to provide your own version string and args, then use:
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docopt.ParseArgs(usage, argv, "1.2.3")
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If the last parameter (version) is a non-empty string, it will be printed when
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--version is given in the argv slice. Finally, we can instantiate our own
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docopt.Parser which gives us control over how things like help messages are
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printed and whether to exit after displaying usage messages, etc.
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parser := &docopt.Parser{
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HelpHandler: docopt.PrintHelpOnly,
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OptionsFirst: true,
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}
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opts, err := parser.ParseArgs(usage, argv, "")
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In particular, setting your own custom HelpHandler function makes unit testing
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your own docs with example command line invocations much more enjoyable.
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All three of these return a map of option names to the values parsed from argv,
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and an error or nil. You can get the values using the helpers, or just treat it
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as a regular map:
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flag, _ := opts.Bool("--flag")
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secs, _ := opts.Int("<seconds>")
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Additionally, you can `Bind` these to a struct, assigning option values to the
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exported fields of that struct, all at once.
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var config struct {
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Command string `docopt:"<cmd>"`
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Tries int `docopt:"-n"`
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Force bool // Gets the value of --force
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}
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opts.Bind(&config)
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*/
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package docopt
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