How to parse a string array

[guptanitin280]

(warning: heavily edited by @meatballhat)

I read through the doc but could not find how to parse argument like:

'["hello", "world"]' "Golang"

so when I use

context.Args().Get(0)

I get ["hello","world"]

and when I use

context.Args().Get(1)

I get "Golang".

[meatballhat]

@guptanitin280 If your intent is for ["hello", "world"] to be parsed as a []string{}, then cli.Context.Args is probably not what you want.

The primary intended use of cli.Context.Args is to allow arbitrary positional arguments to be passed through (un-parsed!) to a given action.

For example:

package main

import (
        "encoding/json"
        "fmt"
        "log"
        "os"

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

func main() {
        sentenceFlag := &cli.StringSliceFlag{Name: "sentence"}
        wordFlag := &cli.StringFlag{Name: "word"}

        app := &cli.App{
                Action: func(cCtx *cli.Context) error {
                        jb, err := json.MarshalIndent(map[string]interface{}{
                                "Args":         cCtx.Args(),
                                "sentenceFlag": sentenceFlag.Get(cCtx),
                                "wordFlag":     wordFlag.Get(cCtx),
                        }, "", "  ")
                        if err != nil {
                                return err
                        }

                        fmt.Println(string(jb))

                        return nil
                },
                Flags: []cli.Flag{sentenceFlag, wordFlag},
        }

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

$ go run example.go --word ok --sentence "hello,world" '["hello", "world"]' "Golang"
{
  "Args": [
    "[\"hello\", \"world\"]",
    "Golang"
  ],
  "sentenceFlag": [
    "hello",
    "world"
  ],
  "wordFlag": "ok"
}

$ go run example.go --word 'hello world' --sentence "hello" --sentence "world" '["hello", "world"]' "Golang"
{
  "Args": [
    "[\"hello\", \"world\"]",
    "Golang"
  ],
  "sentenceFlag": [
    "hello",
    "world"
  ],
  "wordFlag": "hello world"
}