Arg::value_parser

value_parser

since 0.1.0

Specify the typed behavior of the argument.

Example

Spec

TOML

name = "raw"
[args]
color = { long = "color", value-parser = ["always", "auto", "never"], default-value = "auto" }

YAML

name: raw
args:
  color:
    long: color
    value-parser:
    - always
    - auto
    - never
    default-value: auto

JSON

{
  "name": "raw",
  "args": {
    "color": {
      "long": "color",
      "value-parser": [
        "always",
        "auto",
        "never"
      ],
      "default-value": "auto"
    }
  }
}

Input

prog --color auto

Output

claptrap_color='auto'