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Make negatable flag name customisable (#439)

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* fix: Check if negatable duplicates another flag

Add a check for flags with the `negatable` option if the negative flag
conflicts with another tag, such as:

    Flag   bool `negatable:""`
    NoFlag bool

The flag `--no-flag` is ambiguous in this scenario.

* feat: Make negatable flag name customisable

Allow a value on the `negatable` tag to specify a flag name to use for
negation instead of using `--no-<flag-name>` as the flag.

e.g.

    Approve bool `default:"true",negatable:"deny"`

This example will allow `--deny` to set the `Approve` field to false.
This commit is contained in:
Cam Hutchison
2024-09-10 21:02:37 +10:00
committed by GitHub
parent 7d84b95294
commit 4ecb53599b
8 changed files with 128 additions and 49 deletions
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README.md
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@@ -571,6 +571,7 @@ Both can coexist with standard Tag parsing.
| `optional:""` | If present, flag/arg is optional. |
| `hidden:""` | If present, command or flag is hidden. |
| `negatable:""` | If present on a `bool` field, supports prefixing a flag with `--no-` to invert the default value |
| `negatable:"X"` | If present on a `bool` field, supports `--X` to invert the default value |
| `format:"X"` | Format for parsing input, if supported. |
| `sep:"X"` | Separator for sequences (defaults to ","). May be `none` to disable splitting. |
| `mapsep:"X"` | Separator for maps (defaults to ";"). May be `none` to disable splitting. |