Subcommands

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

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/urfave/cli/v2"
)

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

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

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Last update: August 15, 2022