Subcommands

Subcommands can be defined for a more git-like command line app.

package main

import (
  "fmt"
  "log"
  "os"

  "github.com/urfave/cli"
)

func main() {
  app := cli.NewApp()

  app.Commands = []cli.Command{
    {
      Name:    "add",
      Aliases: []string{"a"},
      Usage:   "add a task to the list",
      Action:  func(c *cli.Context) error {
        fmt.Println("added task: ", c.Args().First())
        return nil
      },
    },
    {
      Name:    "complete",
      Aliases: []string{"c"},
      Usage:   "complete a task on the list",
      Action:  func(c *cli.Context) error {
        fmt.Println("completed task: ", c.Args().First())
        return nil
      },
    },
    {
      Name:        "template",
      Aliases:     []string{"t"},
      Usage:       "options for task templates",
      Subcommands: []cli.Command{
        {
          Name:  "add",
          Usage: "add a new template",
          Action: func(c *cli.Context) error {
            fmt.Println("new task template: ", c.Args().First())
            return nil
          },
        },
        {
          Name:  "remove",
          Usage: "remove an existing template",
          Action: func(c *cli.Context) error {
            fmt.Println("removed task template: ", c.Args().First())
            return nil
          },
        },
      },
    },
  }

  err := app.Run(os.Args)
  if err != nil {
    log.Fatal(err)
  }
}

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Last update: August 15, 2022