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55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"strings"
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)
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type Command struct {
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// Run runs the command.
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// The args are the arguments after the command name.
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Run func(cmd *Command, args []string) bool
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// UsageLine is the one-line usage message.
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// The first word in the line is taken to be the command name.
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UsageLine string
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// Short is the short description shown in the 'go help' output.
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Short string
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// Long is the long message shown in the 'go help <this-command>' output.
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Long string
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// Flag is a set of flags specific to this command.
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Flag flag.FlagSet
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IsDebug *bool
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}
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// Name returns the command's name: the first word in the usage line.
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func (c *Command) Name() string {
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name := c.UsageLine
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i := strings.Index(name, " ")
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if i >= 0 {
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name = name[:i]
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}
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return name
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}
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func (c *Command) Usage() {
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fmt.Fprintf(os.Stderr, "Example: weed %s\n", c.UsageLine)
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fmt.Fprintf(os.Stderr, "Default Usage:\n")
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c.Flag.PrintDefaults()
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fmt.Fprintf(os.Stderr, "Description:\n")
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fmt.Fprintf(os.Stderr, " %s\n", strings.TrimSpace(c.Long))
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os.Exit(2)
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}
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// Runnable reports whether the command can be run; otherwise
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// it is a documentation pseudo-command such as importpath.
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func (c *Command) Runnable() bool {
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return c.Run != nil
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}
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